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  • Ternary Composite Nanosheets with MoS2/WS2/Graphene Heterostructures as High Performance Cathode Materials for Supercapacitors
    ChemElectroChem (IF 4.136) Pub Date : 2018-01-15
    Tsung-Wu Lin, Thangarasu Sadhasivam, Ai-Yin Wang, Ting-Yu Chen, Jeng-Yu Lin, Li-Dong Shao

    A new class of ternary heterostructure consisting of a reduced graphene oxide, molybdenum disulfide and tungsten disulfide (rGO-MoS2-WS2) is prepared through a simple chemical method. According to Raman and X-ray photoelectron spectroscopies, MoS2/WS2 heterostructure is uniformly formed on the conductive rGO support. Furthermore, rGO-MoS2-WS2 possesses the large surface area of 109 m2 g-1 and the hierarchical pore architecture. When served as the electrode for supercapacitors, rGO-MoS2-WS2 exhibits the pseudocapacitive behavior in a KOH solution. It is found that rGO-MoS2-WS2 displays the specific capacitance (Cs) of 365 F g-1 at 1 A g-1 being much higher than those of single TMD (MoS2 or WS2) based composites. The enhanced electrochemical performance of rGO-MoS2-WS2 is achieved due to the lower internal resistance through heterostructure formation, the wide range of TMD oxidation states and uniform distribution of the few-layered TMD nanosheets on the rGO surface. Furthermore, the optimal loading amount of MoS2/WS2 heterostructure in the composite is investigated. To demonstrate its practical application, rGO-MoS2-WS2 is used as a positive electrode for an asymmetric supercapacitor (ASC). The maximum energy density of the ASC device is 15 Wh kg-1 at the power density of 373 W kg-1. Furthermore, the device remains ca. 70 % of the initial Cs value after 3000 cycles, which shows the excellent cycling stability.

    更新日期:2018-01-16
  • Improvement of Current Efficiency in Anodic Chlorination of Poly(3-hexylthiophene) by using a Boron Trifluoride-Diethyl Ether Complex
    ChemElectroChem (IF 4.136) Pub Date : 2018-01-16
    Tomoyuki Kurioka, Hiroki Nishiyama, Ikuyoshi Tomita, Shinsuke Inagi
    更新日期:2018-01-16
  • SnS/SnSb@C Nanofiber with Enhanced Cycling Stability via Vulcanization as Anode for Sodium Ion Batteries
    ChemElectroChem (IF 4.136) Pub Date : 2018-01-15
    Jian Zhu, Chaoqun Shang, Zhenyu Wang, Junjun Zhang, Ying Liu, Shuai Gu, Liangjun Zhou, Hua Cheng, Yingying Gu, Zhouguang Lu

    Exploring resource-abundant and high-performance anode materials for sodium-ion batteries remains a critical challenge in the current research state. For example, the practical applications of sodium ion batteries are restricted by the severe volume variation of active materials on anode, which often results in irreversible capacity loss and poor cycling performance. Utilizing the different redox potential of metals is shown to be an effective way to alleviating volume changes. Here we demonstrate that SnS/SnSb nanoparticles decorated carbon nanofibers prepared via vulcanization are promising candidate as the anode material for sodium-ion batteries. The resultant SnS/SnSb@C composites show an impressive electrochemical performance featuring a large discharge capacity (1028 mAh g-1 at 50 mA g-1), rate capability (159 mAh g-1 at 2 A g-1), and excellent cycling stability (270 mAh g-1 at 200 mA g-1 after 200 cycles). The different sodiation/desodiation potential of Sn and Sb in SnS/SnSb@C composite helps to alleviate the volume expansion during cycling, and the defects within carbon nanofibers caused by sulfur doping further promote fast ion and electron transport in sodium ion batteries.

    更新日期:2018-01-15
  • Electrochemistry of polyoxometalates: From fundamental aspects to applications
    ChemElectroChem (IF 4.136) Pub Date : 2018-01-15
    Tadaharu Ueda

    Electrochemistry of polyoxometalates is very rich since many of them can accommodate many electrons without their structure change. Recently, extensive attentions have been paid to the development of new generation battery such as fuel cell, redox flow battery, with polyoxometalates as catalysts. On the other hand, the detailed voltammetric behavior of polyoxometalates still remains unclear although a huge number of polyoxometalates have been prepared and characterized for a long time. This review addresses electrochemical properties of various polyoxometalates from fundamental and practical points of view.

    更新日期:2018-01-15
  • Sulfur-Linked Covalent Triazine Frameworks doped with Coordinatively-Unsaturated Cu(I) as Electrocatalysts for Oxygen Reduction
    ChemElectroChem (IF 4.136) Pub Date : 2018-01-15
    Kazuyuki Iwase, Kazuhide Kamiya, Masaru Miyayama, Kazuhito Hashimoto, Shuji Nakanishi

    This work confirmed a trade-off relationship between the high redox potential of Cu and the oxygen-binding ability of Cu-based oxygen reduction reaction (ORR) electrocatalysts. Because the ORR is mediated by Cu(I) species, a positive shift of the Cu(II/I) potential is required to increase the ORR onset potential. However, the ready simultaneous autoreduction of Cu(II) to Cu(I) in Cu complexes due to high redox potentials results in the formation of a closed tetrahedral configuration that is inactive for O₂ adsorption and therefore for the ORR. To mitigate this problem, we synthesized a Cu-modified S-linked covalent triazine framework (Cu-S-CTF) as an electrocatalyst for the ORR in neutral solutions. The Cu(I) ions in this material have a distorted three-coordinated structure with accessible coordination sites for O₂ because the inflexibility of the CTF suppresses the formation of the tetrahedral configuration. The ORR onset potential of Cu-S-CTF was 880 mV versus a reversible hydrogen electrode at pH 7. This is the first example of an ORR electrocatalyst containing Cu sites with both high redox potential and oxygen-binding ability.

    更新日期:2018-01-15
  • MOF-derived Co Nanoparticles Deposited on N-doped Bimodal Mesoporous Carbon Nanorods as Efficient Bifunctional Catalysts for Rechargeable Zinc-Air Batteries
    ChemElectroChem (IF 4.136) Pub Date : 2018-01-14
    Huijuan Han, Shujun Chao, Zhengyu Bai, Xiaobing Wang, Xiaoli Yang, Jinli Qiao, Zhongwei Chen, Lin Yang

    Electrically rechargeable zinc-air batteries (ZnABs) have received increasing attention as promising energy storage devices due to their high theoretical energy density and environmental friendliness. However, it remains a great challenge to develop highly efficient bifunctional catalysts for the oxygen reduction reaction (ORR) and oxygen evolution reaction (OER). Herein, we design and prepare a highly active bifunctional catalyst for ZnABs by using a cobalt metal-organic framework (Co-MOF) as precursor. The catalyst has a desirable nanostructure composed of cobalt nanoparticles deposited on N-doped bimodal mesoporous carbon nanorods (Co@N-CNR). This hybrid structure has higher catalytic activity (a maximum power density of 63 mW cm-2) and cycling stability compared to commercial Pt/C+Ir/C integrated in ZnABs. The high catalytic performance could be attributed to the unique nanostructure composed of Co@N-CNR, which incorporates the advantageous features of cobalt nanoparticles, mesoporous materials and N-CNR towards OER and ORR. The reported advancement provides a new and efficient strategy for the development of rechargeable ZnABs.

    更新日期:2018-01-15
  • Core/Shell NiFe Nano-Alloy@Discrete N-doped Graphitic Cover for Enhanced Water Oxidation
    ChemElectroChem (IF 4.136) Pub Date : 2018-01-14
    Chen Deng, Kuang-Hsu Wu, Jason Scott, Shenmin Zhu, Rose Amal, Da-Wei Wang

    Developing highly efficient and earth-abundant electrocatalysts for the oxygen evolution reaction (OER) is critical in overall water splitting technology. Among all transition metal based materials, NiFe-based electrocatalysts have been regarded as the most promising substitute to commercial noble metals in alkaline condition. To overcome their leaching problem and improve the intrinsic stability without compromising the activity, herein, we report a NiFe alloy covered with a discrete N-doped graphitic shell for OER. The alloy core@discrete graphitic shell structure exhibits enhanced OER activity and stability with a low onset potential of 1.48 V, reduced overpotential of 320 mV@10 mA cm-1 and small Tafel slope value of 41 mV dec-1, which is superior to Ir/C. It is believed that the integration of nitrogen doping, a discrete graphitic shell and the mesoporous structure work in harmony to enhance the OER performance.

    更新日期:2018-01-15
  • Nitrogen Doped Ta2O5 Nanocomposites for Electrocatalytic Reduction of Carbon Dioxide to CO with Photo-Assistance
    ChemElectroChem (IF 4.136) Pub Date : 2018-01-14
    Miao Zhang, Pengfei Hou, Zhuo Wang, Peng Kang

    Electrocatalytic reduction of CO2 to CO was achieved using nitrogen doped Ta2O5, and the Faradaic efficiency of CO reached 87.5% at -0.73 V vs. RHE, whereas undoped Ta2O5 or "fully doped" Ta3N5 only yields H2. The nitrogen doped Ta2O5 was also a catalyst for photo-assisted electrocatalytic CO2 reduction, and the total light-to-chemical efficiency have reached 2.73%.

    更新日期:2018-01-15
  • Enhanced Stability of Lithium Metal Anode by 3D Porous Nickel Substrate
    ChemElectroChem (IF 4.136) Pub Date : 2018-01-11
    Lu Yu, Nathan L Canfield, Shuru Chen, HongKyung Lee, Xiaodi Ren, Mark H Engelhard, Qiuyan Li, Jun Liu, Wu Xu, Ji-Guang Zhang

    Lithium (Li) metal is considered as the "holy grail" anode for high energy density batteries, but its applications in rechargeable Li metal batteries are still hindered by the formation of Li dendrites and low coulombic efficiency for Li plating/stripping. An effective strategy to stabilize Li metal is to embed a Li metal anode in a three-dimensional (3D) current collector. Here, a highly porous 3D Ni substrate is reported to effectively stabilize a Li metal anode. Using galvanostatic intermittent titration technique combined with scanning electron microscopy, the underlying mechanism of the improved stability of the Li metal anode is revealed. It is clearly demonstrated that the porous 3D Ni substrate can effectively suppress the formation of "dead" Li and support the generation of a dense surface passivation layer, while a highly porous "dead" Li layer is accumulated on the 2D Li metal, which eventually limits mass transport. X-ray photoelectron spectroscopy results further reveal the compositional differences in the solid-electrolyte interphase layer formed on the Li metal embedded in the porous 3D Ni substrate and the 2D Li metal substrate. These results indicate that the use of 3D conductive host is critical for long-term stability of Li metal batteries.

    更新日期:2018-01-11
  • Tin assisted Sb2S3 Nanoparticles Uniformly Grafted on Graphene Effectively Improved Sodium Ion Storage Performance
    ChemElectroChem (IF 4.136) Pub Date : 2018-01-10
    Baihua Qu, Pan Deng, Jing Yang, Wei He, Shengyang Li, Weichang Zhou, Dongsheng Tang

    Herein, tin assisted antimony sulfide decorated on reduced graphene oxide (Sn@Sb2S3-rGO) composites were prepared by a simple hydrothermal method. As an anode material of sodium ion batteries (SIBs), the Sn@Sb2S3-rGO composites exhibited good electrochemical performance with an initial discharge (sodiation) specific capacity of 1002.0 mAh g-1, and kept the specific capacity of ~600 mAh g-1 at a current density of 200 mA g-1 after 60 cycles. The good performances could be explained by the composite with graphene and bimetallic synergistic effect, both of which have an impact on the structure of Sb2S3 and subsequent electrochemical performance. This approach to the bimetallic synergistic effect of graphene composite would be a promising new idea to design other high-performance energy storage materials.

    更新日期:2018-01-10
  • Enhanced Catalytic Activity for Glycerol Oxidation Enabled by Activated Carbon Supported Palladium Catalysts Prepared by Atomic Layer Deposition
    ChemElectroChem (IF 4.136) Pub Date : 2018-01-09
    Yaovi Holade, Matthieu Weber, Philippe Collot, Hoda El Gaddari, Sophie Tingry, Mikhael Bechelany

    The ability to precisely engineer advanced catalysts for oxygen reduction reaction (ORR) and glycerol oxidation reaction (GOR) is crucial for the deployment of fuel cells (FCs) and electrolyzers technologies. In this work, we used an atomic layer deposition (ALD) process in order to prepare highly dispersed palladium nanoparticles (PdNPs) on electro-activated carbon felt electrodes. The PdNPs prepared were well dispersed and presented diameters of 4-6 nm, corresponding to a mass loading of 96 µgPd cm-2 or 0.9 wt.%. For GOR, the as-synthesized nanocatalysts outperformed the commercial Pd/C (20 wt.%) reference by an order of magnitude. The bare electrode also displays distinguished kinetics towards ORR. The enhanced performance is explained by the good palladium-carbon interaction, and the reduced aggregation and/or detachment of PdNPs. The results uncovered herein provide new strategic routes for the development of advanced electrodes for application in electrochemical energy conversion

    更新日期:2018-01-09
  • Preparation of hollow CeO2/CePO4 with N, P-codoped carbon shell for enhanced oxygen reduction reaction catalytic activity
    ChemElectroChem (IF 4.136) Pub Date : 2018-01-08
    Yue Yu, Bowen He, Yujia Liao, Xiaodan Yu, Zhongcheng Mu, Yan Xing, Shuangxi Xing

    Achieving active and sustainable electrocatalysts towards oxygen reduction reaction with low cost and high performance attracts great interest in the field of fuel cells. Here, we report a facile route to prepare hollow CeO2/CePO4@N,P-codoped carbon via pyrolyzing CeO2@polyaniline obtained in the presence of phytic acid. By virtue of the codoping of N and P elements, the existence of oxygen vacancies and the formation of the void, the product illustrated an excellent catalytic activity towards oxygen reduction reaction with the onset and half-wave potential of 0.918 V and 0.822 V, respectively, and a current density of 4.38 mA cm-2 at 0.565 V vs. RHE. Furthermore, it presented a high durability and strong methanol tolerance, revealing its great potential for application in energy conversion.

    更新日期:2018-01-09
  • Monitoring potential-induced DNA dehybridization kinetics for SNP detection using in-situ surface enhanced Raman scattering
    ChemElectroChem (IF 4.136) Pub Date : 2018-01-08
    Yassin Ugur Kayran, Nergis Cinar, Daliborka Jambrec, Wolfgang Schuhmann

    Changes in temperature, ionic strength or electrical field are generally employed to dehybridize double-stranded DNA (dsDNA). In contrast, we propose potential-induced dsDNA dehybridization to distinguish fully-matched target DNA (tDNA) from tDNA with a single nucleotide polymorphism (SNP) by following their dehybridization ki¬netics using in-situ surface enhanced Raman scattering (SERS). The determination of the potential that evokes notable dehybridization of dsDNA without causing any desorption of the immobilized probe DNA (pDNA) from the electrode surface was performed by investigating the desorption kinetics of labelled single-stranded DNA (ssDNA) and de¬hybridization kinetics of dsDNA with libelled tDNA. This comparatively simple approach allows for SNP detection within minutes.

    更新日期:2018-01-08
  • Hierarchically Porous Carbon as High-rate and Long-life Electrode Materials for High Performance Supercapacitors
    ChemElectroChem (IF 4.136) Pub Date : 2018-01-04
    Junhong Guo, Hongwei Guo, Li Zhang, Baoping Yang, jinfeng cui

    In this study, the cost-effective hierarchically porous carbon (HPC) drived from starch was successfully prepared through a simple mixture and subsequent one-step carbonization method. The as-prepared carbon present three-dimensional interconnected hierarchically porous structure. Therefore, HPC exhibits a high specific surface area of 2259.54 m2 g-1 and a specific capacitance of 385.7 F g-1 at 1 A g-1 in a three-electrode system. When the as-prepared carbon was employed to fabricate an aqueous symmetrical supercapacitor, the device displayed a high specific capacitance of 81.3 F g-1 at 1 A g-1, even at 20 A g-1, the specific capacitance still possesses 64 F g-1 (capacity retention rate of 78.72% compares with that at 1 A g-1), showing an outstanding rate performance. This supercapacitor still maintains a capacity retention of 100% after 60000 cycles at the current density of 5 A g-1, indicating superior long-term cycling stability. Furthermore, when the as-prepared carbon was employed to fabricate an ionic-liquid symmetrical supercapacitor, with a high energy density is successfully assembled in ionic liquid (1-ethyl-3-methylimidazolium tetrafluoroborate, EmimBF4) electrolyte, which ultimately achieves an ultrahigh energy density of 133.94 Wh kg-1 (power density of 1997.51 W kg-1) and the capacity retention rate of 83.3% was maintained after 5000 cycles under a wide operating voltage window of 0-4 V at 10 A g-1.

    更新日期:2018-01-04
  • The Surface Structure Sensitivity of CO2 Electroreduction on Low-Index Gold Single Crystal Electrodes in Ionic Liquids
    ChemElectroChem (IF 4.136) Pub Date : 2018-01-03
    Yongchun Fu, Maria R. Ehrenburg, Peter Broekmann, Alexander V. Rudnev

    The activity of low-index Au(hkl) single crystal electrodes towards CO2 electroreduction (CO2RR) was examined for eight room temperature ionic liquids (ILs) by means of cyclic voltammetry. We demonstrate that CO2RR is highly sensitive towards the electrode surface structure, with the Au(110) surface being by far the most active one irrespective of the chemical nature of the IL used as electrolyte. The activity of all three low-index Au(hkl) surfaces towards CO2RR decreases upon multiple potential cycling. In situ scanning tunneling microscopy indicates that this deactivation is related to massive Au surface restructuring processes taking place in ILs due to the potential-induced reconstruction and lifting of the surface reconstruction. Additionally, the Au(111) surface undergoes severe etching at the potentials of CO2RR, whereas we do not observe this etching process for Au(110).

    更新日期:2018-01-04
  • The Applications of Metal−Organic Frameworks in Electrochemical Sensors
    ChemElectroChem (IF 4.136) Pub Date : 2017-11-13
    Lantao Liu, Yanli Zhou, Shuang Liu, Maotian Xu
    更新日期:2018-01-02
  • Bilayer Vesicles as a Noncovalent Immobilization Platform of Electrocatalysts for Energy Conversion in Neutral Aqueous Media
    ChemElectroChem (IF 4.136) Pub Date : 2017-10-23
    Min-Wen Chung, Yu-Chiao Liu, Tao-Hung Yen, Ming-Hsi Chiang
    更新日期:2018-01-02
  • On the Mechanism of Scanning Electrochemical Potential Microscopy
    ChemElectroChem (IF 4.136) Pub Date : 2017-10-16
    Jochen Friedl, Jingying Gu, Ulrich Stimming, Benjamin R. Horrocks
    更新日期:2018-01-02
  • Cobalt Diselenide Nanorods Grafted on Graphitic Carbon Nitride: A Synergistic Catalyst for Oxygen Reactions in Rechargeable Li−O2 Batteries
    ChemElectroChem (IF 4.136) Pub Date : 2017-09-25
    Surender Kumar, Anirudha Jena, Yao Chong Hu, Chaolun Liang, Wuzong Zhou, Tai Feng Hung, Wen Sheng Chang, Ho Chang, Ru Shi Liu
    更新日期:2018-01-02
  • Cobalt−Iron Pyrophosphate Porous Nanosheets as Highly Active Electrocatalysts for the Oxygen Evolution Reaction
    ChemElectroChem (IF 4.136) Pub Date : 2017-11-08
    Miaomiao Liu, Zhengyi Qu, Deqin Yin, Xiaojuan Chen, Yajie Zhang, Yong Guo, Dan Xiao
    更新日期:2018-01-02
  • 更新日期:2018-01-02
  • Continuous Flow Synthesis of Platinum Nanoparticles in Porous Carbon as Durable and Methanol-Tolerant Electrocatalysts for the Oxygen Reduction Reaction
    ChemElectroChem (IF 4.136) Pub Date : 2017-11-03
    Carlota Domínguez, Kevin M. Metz, Md. Khairul Hoque, Michelle P. Browne, Leticia Esteban-Tejeda, Corbin K. Livingston, Suoyuan Lian, Tatiana S. Perova, Paula E. Colavita
    更新日期:2018-01-02
  • Multifunctional Separator with Porous Carbon/Multi-Walled Carbon Nanotube Coating for Advanced Lithium−Sulfur Batteries
    ChemElectroChem (IF 4.136) Pub Date : 2017-11-06
    Lei Tan, Xinhai Li, Zhixing Wang, Huajun Guo, Jiexi Wang, Liang An
    更新日期:2018-01-02
  • Restoration of Degraded Nickel-Rich Cathode Materials for Long-Life Lithium-Ion Batteries
    ChemElectroChem (IF 4.136) Pub Date : 2017-11-07
    Naiteng Wu, Hao Wu, Jang-Kyo Kim, Xianming Liu, Yun Zhang
    更新日期:2018-01-02
  • Synergistic Doping for Pseudocapacitance Sites in Alkaline Carbon Supercapacitors
    ChemElectroChem (IF 4.136) Pub Date : 2017-10-23
    Mei Ni, Zhenghong Huang, Yimeng Lian, Renjie Chen, Xiaoling Zhang, Hailiang Nie, Wen Yang
    更新日期:2018-01-02
  • Composition-Dependent Effect of the Calcination of Cobalt-, Nickel-, and Gallium-Based Layered Double Hydroxides to Mixed Metal Oxides in the Oxygen Evolution Reaction
    ChemElectroChem (IF 4.136) Pub Date : 2017-11-07
    Kalapu Chakrapani, Fatih Özcan, Klaus Friedel Ortega, Thomas Machowski, Malte Behrens
    更新日期:2018-01-02
  • Electrochemical Behaviour of Lithium, Sodium and Potassium Ion Electrolytes in a Na0.33V2O5 Symmetric Pseudocapacitor with High Performance and High Cyclic Stability
    ChemElectroChem (IF 4.136) Pub Date : 2017-11-02
    Ramu Manikandan, C. Justin Raj, Murugesan Rajesh, Byung Chul Kim, Ju Yong Sim, Kook Hyun Yu
    更新日期:2018-01-02
  • In Situ Synthesis of Li2S-Loaded amphiphilic Porous Carbon and Modification of the Li2S Electrode for Long-Life Li2S Batteries
    ChemElectroChem (IF 4.136) Pub Date : 2017-11-07
    Can Wang, Wenlong Cai, Gaoran Li, Binhong Liu, Zhoupeng Li
    更新日期:2018-01-02
  • 更新日期:2018-01-02
  • Na-Doped C70 Fullerene/N-Doped Graphene/Fe-Based Quantum Dot Nanocomposites for Sodium-Ion Batteries with Ultrahigh Coulombic Efficiency
    ChemElectroChem (IF 4.136) Pub Date : 2017-10-24
    Chunlian Wang, Yang Zhang, Wen He, Xudong Zhang, Guihua Yang, Zhaoyang Wang, Manman Ren, Lianzhou Wang
    更新日期:2018-01-02
  • 更新日期:2018-01-02
  • A General Approach Based on Sampled-Current Voltammetry for Minimizing Electrode Fouling in Electroanalytical Detection
    ChemElectroChem (IF 4.136) Pub Date : 2017-11-13
    Isabelle Mazerie, Pierre Didier, Florence Razan, Philippe Hapiot, Nathalie Coulon, Aurélie Girard, Olivier de Sagazan, Didier Floner, Florence Geneste
    更新日期:2018-01-02
  • Bifunctional Electrocatalytic Behavior of Sodium Cobalt Phosphates in Alkaline Solution
    ChemElectroChem (IF 4.136) Pub Date : 2017-10-18
    Ritambhara Gond, Krishnakanth Sada, Baskar Senthilkumar, Prabeer Barpanda
    更新日期:2018-01-02
  • 更新日期:2018-01-02
  • Fructose Dehydrogenase Electron Transfer Pathway in Bioelectrocatalytic Reactions
    ChemElectroChem (IF 4.136) Pub Date : 2017-11-03
    Michal Kizling, Renata Bilewicz
    更新日期:2018-01-02
  • Electrochemical Faradaic Spectroscopy
    ChemElectroChem (IF 4.136) Pub Date : 2017-11-03
    Dijana Jadreško, Dariusz Guziejewski, Valentin Mirčeski
    更新日期:2018-01-02
  • A Highly Efficient Electrocatalyst Derived from Polyaniline@CNTs−SPS for the Oxygen Reduction Reaction
    ChemElectroChem (IF 4.136) Pub Date : 2017-11-03
    Jingjing Xu, Shiyao Lu, Han Zhou, Xu Chen, Yuankun Wang, Chunhui Xiao, Shujiang Ding
    更新日期:2018-01-02
  • Kinetics and Structural Investigation of Layered Li9V3(P2O7)3(PO4)2 as a Cathode Material for Li-Ion Batteries
    ChemElectroChem (IF 4.136) Pub Date : 2017-11-03
    Prasanth Balasubramanian, Marilena Mancini, Holger Geßwein, Dorin Geiger, Peter Axmann, Ute Kaiser, Margret Wohlfahrt-Mehrens
    更新日期:2018-01-02
  • Highly oxygen non-stoichiometric BaSc0.25Co0.75O3-δ as a high performance cathode for intermediate temperature solid oxide fuel cells
    ChemElectroChem (IF 4.136) Pub Date : 2018-01-01
    Bo Liu, Jaka Sunarso, Yuan Zhang, Guangming Yang, Wei Zhou, Zongping Shao

    Abstract: Lowering the operating temperature of solid oxide fuel cell (SOFC) is highly desirable to reduce its cost and increase its lifetime, which relies upon the development of cathode component with high oxygen reduction reaction (ORR) activity at lower temperature. Here we report the characterization of high performance BaScxCo1-xO3-δ (x = 0, 0.125, 0.25, and 0.375) perovskite SOFC cathodes. Unlike BaCoO3-δ that adopts 2H-hexagonal perovskite structure, the replacement of 25 mole % of Co with Sc stabilizes cubic structure, which also leads to the significant reduction in area specific resistances (ASRs) and their activation energies between 650 °C and 500 °C (for BaSc0.25Co0.75O3-δ) relative to the non-doped BaCoO3-δ. At this temperature range, BaSc0.25Co0.75O3-δ displayed remarkably higher ORR activities than Ba0.5Sr0.5Co0.8Fe0.2O3-δ (BSCF), the current cathode benchmark. We attribute such superior ORR performance to the higher oxygen non-stoichiometries of BaSc0.25Co0.75O3-δ relative to BSCF, which also translates to the higher oxygen bulk diffusion and surface exchange coefficients for the former compared to the latter. As a result, single fuel cell based on an anode supported 20 μm-thick SDC electrolyte and BaSc0.25Co0.75O3-δ cathode achieved a very high peak power density of 1723 mW cm-2 at 650 °C. We additionally demonstrated the possibility to increase the ORR activities of BaSc0.25Co0.75O3-δ cathode by impregnation of a low amount of silver.

    更新日期:2018-01-02
  • Unique H2O2 Etching Agent Synthesis of Co2V2O7 Hollow Cylinders with Enhanced Lithium Storage Properties
    ChemElectroChem (IF 4.136) Pub Date : 2018-01-01
    jinli wang, jian pei, ke hua, dahong chen, yang jiao, yongyuan hu, gang chen

    Constructing hollow structure has been considered as an efficient strategy to improve electrochemical properties in lithium-ion batteries (LIBs). In this paper, novel Co2V2O7 hollow cylinders have been fabricated via a unique etching process, in which H2O2 and CO(NH2)2 were selected as etching agent and release rate controlling agent, respectively. The formation process of hollow structure and etching mechanism have been investigated. Benefiting from the improved diffusion and transport of Li+, the Co2V2O7 hollow cylinders electrode demonstrates higher electrochemical performance as an anode material for LIBs than that of Co2V2O7 solid hexagonal prisms. Under current density of 0.4 A g-1, the cycling capacity can be improved to 2.5 times than hexagonal prisms not etched.

    更新日期:2018-01-02
  • Nanostructured Ni2P-C as an efficient catalyst for urea electro-oxidation
    ChemElectroChem (IF 4.136) Pub Date : 2017-12-28
    Dawen Yang, Ying Gu, Xu Yu, Zixia Lin, Huaiguo Xue, Ligang Feng

    Nickel-based catalyst was a kind of cost-effective material for urea oxidation. Here we firstly reported nanostructured Ni2P-C as an efficient catalyst for urea electro-oxidation. Ni2P-C catalyst was prepared by a facile hydrothermal method and the structure and morphology were further characterized by X-ray diffraction(XRD) and transmission electron microscope(TEM). Hexagonal crystal structure for Ni2P was indicated by the characteristic peaks in the XRD patterns, and lattice fringe of Ni2P was clearly observed in the high resolution TEM images. The catalytic ability for urea electrooxidation was studied by cyclic voltammetry and chronoamperometry techniques. It was found that the current density at 0.5 V was ca. 70.4 mA cm-2 about 2.7 times higher than that of referenced commercial nickel oxide catalyst. A good catalytic stability for urea oxidation was also obtained. A diffusion controlled process was observed for urea oxidation on Ni2P catalyst while the active sites arising from Ni(II) ion oxidation was following a surface redox reaction controlled process. Kinetics studies by impedance and Tafel slope displayed an improved charge-transfer kinetics towards urea electrooxidation. The results demonstrated that Ni2P would have potential applications for catalytically urea oxidation.

    更新日期:2017-12-29
  • Electrocatalytical activity of ionic liquid-derived porous carbon materials for oxygen reduction reaction
    ChemElectroChem (IF 4.136) Pub Date : 2017-12-27
    Nikola Zdolsek, Aleksandra Dimitrijevic, Magdalena Bendova, Jugolav Krstic, Raquel P Rocha, Jose L Figueiredo, Danica Bajuk-Bogdanovic, Tatjana Trtic-Petrovic, Biljana Sljukic Paunkovic

    Carbon materials, prepared by different methods using ionic liquid, are compared as electrocatalysts for oxygen reduction reaction (ORR). Materials were synthesized by hydrothermal carbonization of glucose and by the same method in the presence of 1-butyl-3-methylimidazolium methanesulfonate [bmim][MeSO3] as additive. Other two carbon materials were prepared by ionic-liquid based methods: ionothermal carbonization of glucose using [bmim][MeSO3] as recyclable medium for carbonization reaction and by direct carbonization of ionic liquid, one step method using [bmim][MeSO3] as precursor for N- and S-doped porous carbon (Carb-IL).Characterization results showed possibility of morphology and porosity control using [bmim][MeSO3]. All materials were subsequently tested for ORR in alkaline media. Carb-IL showed the enhanced electrocatalytic and stable ORR activity, even in the presence of methanol, ethanol and borohydride, opening possibility for its application in fuel cells.

    更新日期:2017-12-28
  • Nitrogenated Graphite-Encapsulated Carbon Black as a Metal-free Electrocatalyst for the Oxygen Evolution Reaction in Acid
    ChemElectroChem (IF 4.136) Pub Date : 2017-12-22
    Yansong Zhu, Tianran Zhang, Jim Yang Lee

    Oxygen evolution reaction (OER) in acid solution is very challenging for metal-free catalysts based only on heteroatom-doped carbon nanomaterials; which have thus far shown relatively low catalytic activity and poor stability. Herein, we report a core-shell like carbon catalyst consisting of a few layers of nitrogen-doped graphite on a carbon black core prepared by pyrolyzing an ionic liquid (IL) with carbon black (CB) particles. The catalyst prepared as such has noticeably improved the OER performance of nanocarbon in acid solution (1.70V at a current density of 10 mA cm-2) in comparison with the few metal-free OER electrocatalysts reported to date. The experimental results suggest that the resilience of the catalyst in acid solution is due to the greater protection of the nitrogen-containing OER active sites in a graphitic shell.

    更新日期:2017-12-22
  • Size-dependent Electrochemical Performance of Monolithic Anatase TiO2 Nanotube Anodes for Sodium-ion Batteries
    ChemElectroChem (IF 4.136) Pub Date : 2017-12-21
    Wei Wei, Mario Valvo, Kristina Edström, Leif Nyholm

    Well-defined, monolithic TiO2 nanotube thin films have been used as model anode electrodes to study Na-ion storage in anatase TiO2. It is shown that anatase TiO2 nanotubes with wall thicknesses up to 50 nm can be transformed into amorphous sodium titanate (e.g. Na0.2TiO2) nanotubes via an electrochemical activation process at about 0.2 V vs. Na+/Na. Due to the Na+ insertion and extraction reactions at about 0.55 and 0.75 V vs. Na+/Na, respectively, the activated TiO2 nanotubes exhibit reversible capacities of 170 mAh g-1. For the first time, it is shown that the nanotube length and wall thickness play critical roles in determining the electrochemical performances of this type of electrodes in Na-ion cells. An excellent rate performance, yielding capacities of 33 mAh g-1 at 20C and 161 mAh g-1 at C/5 rates, as well as a capacity retention of more than 97% after more than 350 cycles, could be achieved with nanotubes with a wall thickness of up to 20 nm. The cycling rate for the nanotubes with a tube length of 4.5 m should, however, be limited to 1C to guarantee a cycle life of about 200 cycles.

    更新日期:2017-12-21
  • N, P-doped hierarchical porous graphene as metal-free bifunctional air-cathode for Zn-air batteries
    ChemElectroChem (IF 4.136) Pub Date : 2017-12-21
    Lijun Zhou, Chunyan Zhang, Xiaoyi Cai, Yao Qian, Haifeng Jiang, Baosheng Li, Linfei Lai, Zexiang Shen, Wei Huang

    The development of high-efficiency Zn-air batteries is among the emerging energy storage and conversion technologies. In this work, hierarchically structured N, P-codopedgraphene (NPHG) has been synthesized by chemical polymerization of aniline and phytic acid in the presence of SiO2 nanoparticlesand applied as air-cathodes for rechargeable Zn-air batteries due to its high bifunctional oxygen electrocatalytic activities. The P-N bond, rather than P-C or P=N bond in NPHG is proposed to be responsible for the high catalytic activity.The rechargeable Zn-air batteries assembled from this N, P-co-doped graphene exhibited much higher reversibility and better stability compared with a benchmark Pt/C catalyzer.

    更新日期:2017-12-21
  • Some Attributes of Mn3+ Sites in Nickel-Based Layered Double Hydroxides during Methanol Electro-oxidation in Alkaline Media
    ChemElectroChem (IF 4.136) Pub Date : 2017-12-19
    Miguel A. Oliver-Tolentino, Guadalupe Ramos-Sánchez, Arturo Manzo-Robledo, Daniel Ramírez-Rosales, Jorge L. Flores-Moreno, Enrique Lima, Ariel Guzmán-Vargas
    更新日期:2017-12-19
  • Individual Detection and Characterization of Non-Electrocatalytic, Redox-Inactive Particles in Solution by using Electrochemistry
    ChemElectroChem (IF 4.136) Pub Date : 2017-12-19
    Eduardo Laborda, Angela Molina, Christopher Batchelor-McAuley, Richard G. Compton
    更新日期:2017-12-19
  • Electrochemically Initiated Cross Linking of Chitosan
    ChemElectroChem (IF 4.136) Pub Date : 2017-12-18
    Feng Zheng, Nathan S. Lawrence, Robert S. Hartshorne, Adrian Fisher

    The electrochemical oxidation of catechol has been studied in the presence of d-glucosamine and chitosan using cyclic voltammetry. The reaction is studied at various scan rates and different concentrations of d-glucosamine and chitosan. The results indicate that the reaction system between catechol and d-glucosamine follows an EC mechanism, with thin film product being produced on the electrode surface. Accordingly, the reaction of chitosan and catechol was studied to develop a means of cross-linking the chitosan to form polymer based gels.

    更新日期:2017-12-18
  • Improved performance of ionic liquid supercapacitors using tetracyanoborate anions
    ChemElectroChem (IF 4.136) Pub Date : 2017-12-15
    Vitor L Martins, Anthony J. R. Rennie, Nedher Sanchez-Ramirez, Roberto M. Torresi, Peter J. Hall

    Supercapacitors are energy storage devices designed to operate at higher power densities than conventional batteries, but their energy density is still too low for many applications. Efforts are made to design new electrolytes with wider electrochemical windows than aqueous or conventional organic electrolytes in order to increase energy density. Ionic liquids (ILs) with wide electrochemical stability windows are excellent candidates to be employed as supercapacitor electrolytes. ILs containing tetracyanoborate anions [B(CN)₄] offer wider electrochemical stability than conventional electrolytes and maintain a high ionic conductivity (6.9 mS cm-¹). Herein we report the use of ILs containing the [B(CN)₄] anion for such an application. They presented high maximum operating potential of 3.7 V, and two-electrode devices demonstrate high specific capacitances even when operating at relatively high rates (~20 F g-¹ @ 15 A g-¹). This supercapacitor stored more energy and operated at higher power at all rates studied when compared with cells using a commonly studied IL.

    更新日期:2017-12-15
  • Semioperations and Convolutions in Voltammetry
    ChemElectroChem (IF 4.136) Pub Date : 2017-12-15
    Peter J. Mahon, Keith B. Oldham

    It is often useful to transform a measured signal into a form that is more easily interpreted. Thus, in voltammetry, where the measurement is of a current responding to a perturbation of the electrode potential, the complications arising from diffusional transport may be readily alleviated through the use of semioperators or convolutions. The use of semiintegration enables the voltammetric current to be transformed into an alternative signal that, in the case of a planar electrode, is linearly related to the concentrations of reactant and product at the electrode surface. Numerous advantages of semiintegration have been widely demonstrated. However, semiintegration is but a special case of the more general procedure of convolution. Convolving the voltammetric current with specifically designed functions of time allows the benefits of semiintegration to be applied to other electrode geometries and other experimental circumstances. The prime motive for semiintegration or convolution is to gain access to information about concentrations at the electrode surface. This information opens the door to the measurement of such quantities as bulk concentrations, rate constants, standard potentials, and diffusivities, as well as suggesting mechanisms and enabling the calibration of electrodes.

    更新日期:2017-12-15
  • Covalent Triazine Framework Anchored with Co₃O₄ Nanoparticles for Efficient Oxygen Reduction Reaction
    ChemElectroChem (IF 4.136) Pub Date : 2017-12-13
    Sicong Chen, Yuanzhi Zhu, Danyun Xu, Wenchao Peng, Yang Li, Guoliang Zhang, Fengbao Zhang, Xiaobin Fan

    Oxygen reduction reaction (ORR) is an important process in energy conversion and storage devices. Great efforts have been focused on developing efficient, durable, and low-cost non-Pt catalysts. In this study, a novel hybrid ORR catalyst of Co₃O₄ and covalent triazine framework (CTF) was prepared by in-situ growth of Co₃O₄ nanoparticles on CTF using the hydrothermal method. Systematical studies revealed that this hybrid catalyst not only showed synergistic catalytic effect in ORR, but also has superior stability and better methanol resistance than commercial Pt/C.

    更新日期:2017-12-14
  • Sandwich-like nanosheets of N-doped porous carbon/graphene composite with enhanced electrochemical properties for lithium and sodium storage
    ChemElectroChem (IF 4.136) Pub Date : 2017-12-12
    Weiwei Qin, Yongqiang Teng, Junke Zhang, Xinfeng Xiao, Yuan Li, Zhenyu Li

    Energy storage systems including lithium/sodium-ions batteries, are the important guarantee in order to use the renewable energies efficiently. The anode material is a vital link in the great industrialization chain. Herein, a sandwich-like N-doped porous carbon/graphene(N-HCG) composite has been successfully achieved by a facile and low-temperature liquid-phase method with melamine as nitrogen source, followed by a carbonization process. The composite possesses a high specific surface area of 282.4 m2 g-1. As an anode in lithium-ion batteries, the N-HCG delivers a capacity of 643 mAh g-1 at 100 mA g-1, and a high capacity of 406 mAh g-1 is maintained even at 5 A g-1 after 2700 cycles. As to sodium-ion batteries, the capacities of the N-HCG electrodes are retained at 208 mAh g-1 (100 mA g-1 for 120 cycles) and 145 mAh g-1 (1000 mA g-1 for 700 cycles). The excellent electrochemical performance including the rate capability and lifespan of the N-HCG can be attributed to the synergistic effects of the 2D sandwich-like nanosheets with pores and extrinsic nitrogen doping. Thus, the as-prepared N-HCG composite is a highly promising anode material for LIBs/SIBs application.

    更新日期:2017-12-14
  • A missing piece of anodizing puzzle: ex-situ evidence on the role of fluoride-rich-layer switching the growth of nanopores to nanotubes
    ChemElectroChem (IF 4.136) Pub Date : 2017-12-11
    Damian Kowalski, Khurram Shahzad, Chunyu Zhu, Yoshitaka Aoki, Hiroki Habazaki

    Anodizing is a high voltage electrochemical conversion process that forms barrier-type oxide layers or self-organized nanoporous/nanotubular structures. So far, the Al2O3-like nanopores and TiO2-like nanotubes could be successfully synthesized on many metals and alloys. The proposed models of anodic oxide nanotubes growth, however, sacrifice from lack of evidence on the transition from nanopores to nanotubes. The present study demonstrates a missing piece of this anodizing puzzle which is responsible for the formation of nanotubes in fluoride-containing organic electrolytes. For this purpose, we choose an anodic oxide formed on iron, as a model case, because both nanotubes and nanopores can be formed and slow kinetics of transition between those two forms allows us to observe ex-situ a fluoride-rich-layer upon nanopores/nanotubes transition. The compositional fingerprints of this transition shed a light on the general mechanism of nanotubes growth in fluoride-containing electrolytes.

    更新日期:2017-12-14
  • Polycrystalline CoP/CoP2 Structures for Efficient Full Water Splitting
    ChemElectroChem (IF 4.136) Pub Date : 2017-12-08
    Jinghong Li, Shanpeng Li, Gong Zhang, Xinman Tu

    Transition metal phosphides (TMP) have attracted extensive attention for use in the field of full water splitting. Various methods have been investigated to obtain high catalytic activity, but in these synthetic processes, other active materials are inevitably introduced to modify or load onto the surface of the TMP to further improve the catalytic performance. We herein describe a novel approach for preparing CoP/CoP2 structures (650 ℃) by pyrolysis of a complex formed from Co ions crosslinked with phytic acid (PA) using 2-methylimidazole (MeIM). The integration of CoP2 and CoP in the structures can enhance the intrinsic electrical conductivity, and facilitate electron transfer from solution to the electrode. Overpotentials of only 250 mV and 239 mV were required to support the current densities of 10 mA*cm−2 and 20 mA*cm−2 for the oxygen evolution reaction and hydrogen evolution reaction, respectively, demonstrating the potential of the novel material for practical overall water splitting.

    更新日期:2017-12-14
  • Benchmarking the Oxygen Reduction Electrochemical Behavior of First-Row Transition Metal Oxide Clusters on Carbon Nanotube
    ChemElectroChem (IF 4.136) Pub Date : 2017-12-07
    Kuang-Hsu Wu, Mikaela Allen-Ankins, Qingcong Zeng, Bingsen Zhang, Jian Pan, Jiayun Zhang, Dangsheng Su, Ian Gentle, Da-Wei Wang

    Transition metal oxide/nanocarbon hybrid is known to deliver cooperative oxygen reduction reaction (ORR) with synergistic effect from the hybrid interface. This work assesses a series of first-row transition metal oxide in the form of surface-confined clusters on carbon nanotube, as a mimic to fully exposed hybrid interface, to provide an activity benchmark for the hybrid catalysts. Among the selected metal oxides, MnOx and CoOx are found to be the most active first-row transition metal oxide clusters for the ORR given by their excellent peroxide-reducing capability at low overpotential. FeOx and CuOx are also active for the same role except their peroxide-reducing activity is only activated on substantial overpotential. Other metal oxides (NiOx and ZnOx) do not appear to show any activity toward the ORR, even with an integrated interface as a source for possible synergistic effect.

    更新日期:2017-12-14
  • Synthesis, electronic structures and electrochemistry of 3-triarylphosphoraniminato-1,3,5-trithia-2,4,6,8-tetrazocines. Detection of trithiatetrazocinyl radical anions.
    ChemElectroChem (IF 4.136) Pub Date : 2017-12-07
    Xin Yu, Tracey L Roemmele, René T. Boeré

    Reaction of the bicyclic sulfur-nitrogen heterocycles RC6H4CN5S3 (R = 4-CH3O, 4-CH3, 4-H, 4-Cl, 4-CF3, 3-CF3, with PR'3 (R' =C6H5 or 4-CH3OC6H4) produces 3-phosphoraniminato-7-aryl-1,3,5-trithia-2,4,6,8-tetrazocines RC6H4CN4S3NPR'3. In all cases, only the endo-isomers were isolated and characterized by 1H, 31P, and 19F NMR, UV spectroscopy, and X-ray crystallography. RB3LYP/6-311+G(d,p)// RB3LYP/6-31G(d,p) computations were undertaken to help explain the atom-exact syntheses via intermediates previously detected spectroscopically. Three reasonable intermediates have been computed as stationary points with energies consistent with the observed reaction path. Cyclic and square wave voltammetry studies of RC6H4CN4S3NPR'3 using a glassy carbon working electrode in CH2Cl2 with 0.4 M [nBu4N][PF6] all displayed two IRR reduction processes at RT at approximately -1.9 V and -2.2 V, respectively, and one IRR oxidation process at approximately 1.0 V (versus Fc+/0). [RC6H4CN4S3NPR'3]-* radical anions (R' = 4-CH3OC6H4, R = 4-CH3O, 4-H, 4-CF3,) were detected at -50 °C in CH2Cl2 by in-situ electrolysis and simultaneous electron paramagnetic resonance spectroscopy: [4-RC6H4CN4S3NP(4-CH3OC6H4)3]-*, estimated a(31P) = 0.078 mT, a(14N1) = 0.031 mT, a(14N2,3) = 0.256 mT, a(14N4,5) = 0.341 mT. The signals decay rapidly but after electrolysis is ended, a persistent EPR signal is always obtained with EPR parameters that match for known 4-aryl-1,2,3,5-dithiadiazolyls.

    更新日期:2017-12-14
  • Binuclear Phthalocyanine Dimer-Containing Yttrium Double-Decker Ambipolar Semiconductor with Sensitive Response towards Both Oxidizing NO2 and Reducing NH3
    ChemElectroChem (IF 4.136) Pub Date : 2017-12-07
    Jianzhuang Jiang, Guang Lu, Kang Wang, Xia Kong, Houhe Pan, Jinghui Zhang, Yanli Chen

    Thin film transistor fabricated from a binuclear phthalocyanine dimer-containing yttrium double-decker complex [{Pc(OC4H9)8}Y{BiPc(OC4H9)12}Y{Pc(OC4H9)8}] using QLS technique exhibits good ambipolar OFET device performance with carrier mobility of 2.3 and 0.8 cm2 V−1 s−1 for electrons and holes, respectively, representing the highest mobilities achieved so far for solution-processed small-molecule single-component-based ambipolar OFET devices. The ambipolar semiconducting nature of this compound was further confirmed in an unambiguous manner by the high sensitive response of the device towards both oxidizing gas NO2 and reducing gas NH3 in the concentration range of 0.5~3 ppm and 7.5~20 ppm at room temperature.

    更新日期:2017-12-14
  • Boron and iron incorporated α-Co(OH)2 ultrathin nanosheets as an efficient oxygen evolution catalyst
    ChemElectroChem (IF 4.136) Pub Date : 2017-12-07
    yunhua liu, Zhaoyu Jin, panpan li, xianqing tian, xiaojuan chen, Dan Xiao

    Electrochemical water splitting is a critical technology for various energy storage and conversion devices, but greatly restricted by sluggish kinetics of oxygen evolution reaction. Herein, an effective electrocatalyst boron and iron incorporated α-Co(OH)2 (B-α-Co5.8Fe LDH) ultrathin nanosheets was synthesized for the oxygen evolution reaction using sodium tetraphenylborate (NaTPB) as a mild alkali and boron source in ethylene glycol/water system (EG-W) for the first time. Benefiting from the large accessible surface area (563 m2 g-1) and the synergistic effect of Co-Fe-B, the catalyst (B-α-Co5.8Fe LDH) exhibits improved activity and stability in 1 M KOH solution with a low overpotential (264 mV at 10 mA cm-2) and Tafel slope (34 mV dec-1). Besides, this method was also applied to fabricate boron and iron incorporated α-Ni(OH)2. This study should inspire a new pathway to design high efficient OER catalysts.

    更新日期:2017-12-14
  • A Newly Asymmetric-electrolyte Zn-air Battery with Ultrahigh Power Density and Energy Density
    ChemElectroChem (IF 4.136) Pub Date : 2017-12-07
    Pingwei Cai, Yan Li, Junxiang Chen, Jingchun Jia, Genxiang Wang, Zhenhai Wen

    Zn-air batteries have attracted enormous research interest driven by the promise for vehicle propulsion due to their advantages of high-level safety, low cost, and high specific energy density. Here, we reported an asymmetric-electrolyte Zn-air battery with acid catholyte and alkaline anolyte separated by a bipolar membrane. We demonstrate the as-designed Zn-air battery, thanks to the as-formed concentration cell, can deliver a maximum power density of 380 mW cm-2 and a specific energy density of 1522 Wh kg-1 with an open circuit voltage of 2.25 V. The as-proposed newly Zn-air battery performs superior to the conventional Zn-air battery in these pivotal performance parameters.

    更新日期:2017-12-14
  • Effect of A/B-site Non-stoichiometry on Structure and Properties of La0.9Sr0.1Ga0.9Mg0.1O3-δ Solid Electrolyte in IT-SOFC
    ChemElectroChem (IF 4.136) Pub Date : 2017-12-05
    JianQiu Wang, DeFeng Zhou, JinQuan Gao, HaoRan Sun, XiaoFei Zhu, Jian Meng

    (La0.9Sr0.1)x(Ga0.9Mg0.1)yO3-δ ((LS)x(GM)y (x = 0.97, 1.00, 1.03, y = 1.00 and x = 1.00, y = 0.97, 1.00, 1.03) electrolyte is prepared through sol-gel method followed by sintering at 1300 °C for 10 h. The microstructures of the samples are characterized by X-ray diffraction (XRD) and field-emission scanning electron microscopy (FE-SEM). The electrical and thermal stability properties are measured by means of electrochemical impedance spectroscopy (EIS) and thermal expansion coefficient (TEC), respectively. It is shown that phase purity could improve by adjusting the non-stoichiometry of A/B-site. This, in turn, affects the conductivity and thermal expansion of the solid electrolyte. The samples with B-site defects (LS(GM)0.97) are found to exhibit the best phase purity and density with minimal grain boundary/total resistances, and superior thermal stability. The conductivity of LS(GM)0.97 is 1.56-fold higher than that of LSGM. The average thermal expansion coefficient of LS(GM)0.97 at 50-850 °C is 4.13% lower than that of LSGM. The maximum power density of single cells containing LS(GM)0.97 electrolyte could reach 0.54 W cm-1 at 800 °C,which is 16.7% higher than that of cells containing LSGM electrolyte. The stability test for over 120 h at 800 °C indicates a slight decrease in performances during the first 10 h but no significant differences in electrode polarization are observed even after long-term operation.

    更新日期:2017-12-14
Some contents have been Reproduced with permission of the American Chemical Society.
Some contents have been Reproduced by permission of The Royal Society of Chemistry.
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