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  • Comprehensive studies of air-brush spray deposition used in fabricating high-efficiency CH3NH3PbI3 perovskite solar cells: Combining theories with practices
    J. Power Sources (IF 6.945) Pub Date : 2018-09-17
    Haibin Chen, Xihong Ding, Xu Pan, Tasawar Hayat, Ahmed Alsaedi, Yong Ding, Songyuan Dai
    更新日期:2018-09-19
  • In situ formation of consubstantial NiCo2S4 nanorod arrays toward self-standing electrode for high activity supercapacitors and overall water splitting
    J. Power Sources (IF 6.945) Pub Date : 2018-09-18
    Xian-Xia Li, Xiao-Tong Wang, Kang Xiao, Ting Ouyang, Nan Li, Zhao-Qing Liu

    Developing high-efficiency, low-cost and environmental friendly electrode materials for both supercapacitors and overall water splitting are significant for renewable energy storage and conversion. Herein, we report a facile consubstantial growth strategy to fabricate subuliform NiCo2S4 nanorod arrays electrode through an in situ growing process, utilizing self-sacrificial Ni foam as substrate and Ni resource. Benefitting from the unique structures, the subuliform NiCo2S4 nanorods can be directly serve as binder-free, trifunctional electrode for overall water splitting with excellent electrocatalytic activity (oxygen evolution reaction with low overpotential of 220 mV at 30 mA cm−2 and hydrogen evolution reaction with low overpotential of 222 mV at 30 mA cm−2) and also as a promising pseudocapacitance electrode with superior electrochemical performance and good stability (high areal capacitance of 8.85 F cm−2 at a current density of 10 mA cm−2 and 94.96% capacitive retention after 10000 cycles). The present work highlights the remarkable advantages of the self-sacrificial strategy for the design of high-performance multifunctional electrode materials.

    更新日期:2018-09-19
  • A robust flat-chip solid oxide fuel cell coupled with catalytic partial oxidation of methane
    J. Power Sources (IF 6.945) Pub Date : 2018-09-18
    Siqi Gong, Hongyu Zeng, Jin Lin, Yixiang Shi, Qiang Hu, Ningsheng Cai

    This study demonstrates a module that consists of solid oxide fuel cell (SOFC) with flat-chip configuration and a catalytic partial oxidation (CPOX) reformer. The CPOX reformer uses Rh supported by Al2O3 as catalyst and functions effectively. The optimized temperature of CPOX reformer is 800 °C and the optimal C/O ratio to operate the reformer is ca. 0.8 where the maximum reforming efficiency, i.e. 86.1% can be obtained. The CPOX reformer can be coupled with a flat-chip SOFC, which is advantageous for its good thermal shock resistance, quick startup and good response characteristics. The flat-chip SOFC is able to function with a temperature difference over 850 °C across the cell itself and can survive the harsh tests of rapid thermal cycling with the temperature change rate well above 200 °C·min−1, and repetitive redox cycling at least 23 times.

    更新日期:2018-09-19
  • Novel high-performance asymmetric supercapacitors based on nickel-cobalt composite and PPy for flexible and wearable energy storage
    J. Power Sources (IF 6.945) Pub Date : 2018-09-17
    Jianfeng Wen, Bingang Xu, Jinyun Zhou, Yuejiao Chen

    Wearable fiber-shaped supercapacitor (SC) is a kind of one-dimensional flexible devices that can be directly knitted or sewn into various kinds of textile soft-substrate for wearable energy storage. Herein, acid-pretreated stainless steel yarn (SSY) has been developed to support electrodeposition of active materials of nickel/cobalt composite and polypyrrole (PPy) as the positive and negative electrodes, respectively. The asymmetric all-solid-state supercapacitors (AASs) showed both high electrochemical properties and excellent mechanical flexibility under various degrees of deformation. The highest volumetric capacitance reached 14.69 F cm−3 at the current density of 25 mA cm−3, and the maximum energy density was 3.83 mWh·cm−3 (0.032 mWh·cm−2) at a power density of 18.75 mW cm−3 (0.284 mW cm−2). The AASs were highly flexible and durable for directly being sewn into textile fabrics, and exhibited a good electrochemical stability under 6000 charging/discharging cycles. This work uses the common materials and facile methods to fabricate the flexible and wearable AASs with enhanced electrochemical properties, showing a decent way in developing flexible SC devices.

    更新日期:2018-09-19
  • Insights into the synergistic effect of ammonium and phosphate-containing additives for a thermally stable vanadium redox flow battery electrolyte
    J. Power Sources (IF 6.945) Pub Date : 2018-09-17
    Tam D. Nguyen, Luyuan Paul Wang, Adam Whitehead, Nyunt Wai, Günther G. Scherer, Zhichuan J. Xu
    更新日期:2018-09-19
  • Thin films as model system for understanding the electrochemical reaction mechanisms in conversion reaction of MgH2 with lithium
    J. Power Sources (IF 6.945) Pub Date : 2018-09-17
    N. Berti, E. Hadjixenophontos, F. Cuevas, J. Zhang, A. Lacoste, P. Dubot, G. Schmitz, M. Latroche
    更新日期:2018-09-19
  • Balancing formation time and electrochemical performance of high energy lithium-ion batteries
    J. Power Sources (IF 6.945) Pub Date : 2018-09-18
    Chengyu Mao, Seong Jin An, Harry M. Meyer, Jianlin Li, Marissa Wood, Rose E. Ruther, David L. Wood

    Most lithium-ion batteries still rely on intercalation-type graphite materials for anodes, and the formation process for them typically takes several days or even more to provide a stable solid electrolyte interphase (SEI). The slow formation step results in lower LIB production rates, requires a large number of battery cyclers, and constitutes the second highest cost during battery manufacturing. In an effort to decrease the high manufacturing cost associated with long formation times, we studied five different formation protocols in nickel-rich LiNi0.8Mn0.1Co0.1O2 (NMC811)/graphite cells where the total formation time varied from 10 to 86 h. Electrochemical characterization and post mortem analysis show that very long formation time do not necessarily improve long-term performance while very short formation protocols result in lithium plating and poorer electrochemical performance. We find the optimum formation cycling protocol is intermediate in length to minimize impedance growth, improve capacity retention, and avoid lithium plating.

    更新日期:2018-09-19
  • Chemically impregnated NiO catalyst for molten electrolyte based gas-tank-free LiO2 battery
    J. Power Sources (IF 6.945) Pub Date : 2018-09-17
    Kyungeun Baek, Jun Gyeong Lee, Aming Cha, Jiseok Lee, Kwangjin An, Seok Ju Kang

    Closed LiO2 batteries consisting of electrolytes derived from molten salt have emerged as attractive energy-storage cells because of their unique oxygen-supply mechanism to form a stable Li2O discharge product without requiring an oxygen-gas-reservoir. However, the formation of stable Li2O discharge product increases the overpotential during the charging process, which compromises the cell performance because of the resulting parasitic reaction. In this study, we demonstrate a potent approach to reversibly operate an oxygen-gas-reservoir-free LiO2 battery by using chemically impregnated nickel oxide (NiO) nanoparticles as a catalyst on the carbon electrode. The efficient bottom-up process for decorating NiO on a carbon material in binary molten electrolyte enables not only to significantly reduce the loading level of the catalyst but also to enhance the electrochemical performance with preventing the detrimental parasitic reaction in the oxygen-gas-reservoir-free LiO2 cell. In particular, using the in situ gas analysis with electrochemical measurements, the 20 wt% NiO added to the carbon cathode is sufficient to reduce the charging potential without generation of parasitic gas evolution.

    更新日期:2018-09-19
  • 更新日期:2018-09-17
  • Hollow mesoporous carbon spheres enwrapped by small-sized and ultrathin nickel hydroxide nanosheets for high-performance hybrid supercapacitors
    J. Power Sources (IF 6.945) Pub Date : 2018-09-14
    Yongsheng Fu, Yan Zhou, Qiong Peng, Chunyan Yu, Zhen Wu, Jingwen Sun, Junwu Zhu, Xin Wang
    更新日期:2018-09-17
  • Increasing the stability of very high potential electrical double layer capacitors by operando passivation
    J. Power Sources (IF 6.945) Pub Date : 2018-09-15
    M. Pohl, I. Tallo, A. Jänes, T. Romann, E. Lust
    更新日期:2018-09-17
  • 更新日期:2018-09-17
  • Pt-M bimetallic nanoparticles (M = Ni, Cu, Er) supported on metal organic framework-derived N-doped nanostructured carbon for hydrogen evolution and oxygen evolution reaction
    J. Power Sources (IF 6.945) Pub Date : 2018-09-13
    Muhammad Nadeem, Ghulam Yasin, Moazzam H. Bhatti, Mazhar Mehmood, Muhammad Arif, Liming Dai
    更新日期:2018-09-13
  • Power supply for electronic contact lenses: Abiotic glucose fuel cells vs. Mg/air batteries
    J. Power Sources (IF 6.945) Pub Date : 2018-09-13
    Maxi Frei, Julian Martin, Steffen Kindler, Giorgio Cristiano, Roland Zengerle, Sven Kerzenmacher

    Electronic contact lenses are a promising platform for medical sensors. With these devices a variety of vital signs and medical parameters can be monitored noninvasively and without the risk of foreign body response. However, one current limitation of this technology is the need for an external power supply, resulting in bulky, multi component devices. In this paper, we for the first time investigate and compare the application of abiotic glucose fuel cells and Mg/air batteries as alternative power supply technologies for electronic contact lenses. While abiotic glucose fuel cells harvest energy from metabolites present in tear fluid, Mg/air batteries provide electricity by the oxidation of a sacrificial anode. Considering the space available on standard contact lenses, our results indicate that approx. 40 μW and 2 μW can be generated by Mg/air batteries and glucose fuel cells for a period of at least 24 h, respectively. However, coating galvanic cells with the commonly used contact lens material pHEMA, results in drastically reduced performance, presumably due to hindered mass transport. Nevertheless, even under those circumstances a Mg/air battery can still provide about 7 μW for 24 h, which would already be sufficient for many electronic contact lens applications.

    更新日期:2018-09-13
  • Advanced impedance study of polymer electrolyte membrane single cells by means of distribution of relaxation times
    J. Power Sources (IF 6.945) Pub Date : 2018-09-12
    Marcel Heinzmann, André Weber, Ellen Ivers-Tiffée
    更新日期:2018-09-12
  • Leveraging co-laminar flow cells for non-aqueous electrochemical systems
    J. Power Sources (IF 6.945) Pub Date : 2018-09-11
    Omar A. Ibrahim, Erik Kjeang
    更新日期:2018-09-12
  • How the colloid chemistry of precursor electrocatalyst dispersions is related to the polymer electrolyte membrane fuel cell performance
    J. Power Sources (IF 6.945) Pub Date : 2018-09-12
    Michael Bredol, Aleksandra Szydło, Ivan Radev, Wladimir Philippi, Roland Bartholomäus, Volker Peinecke, Angelika Heinzel
    更新日期:2018-09-12
  • In-situ covalent bonding of polysulfides with electrode binders in operando for lithium–sulfur batteries
    J. Power Sources (IF 6.945) Pub Date : 2018-09-10
    ChangAn Yang, QiaoKun Du, Zeheng Li, Min Ling, Xiangyun Song, Vincent Battaglia, Xiaobo Chen, Gao Liu

    Dissolved polysulfides cause high self-discharge, low coulombic efficiency and short cycling life due to their shuttle effect in the charge/discharge cycles in lithium-sulfur (Li-S) batteries. Despite of various attempts (e.g., addition of metal oxides and chalcogenides in the cathode, immobilization of sulfur with various carbons, and confinement of sulfur within the cathode side with membranes) in solving this problem, it still remains a major challenge for Li-S batteries. Here, we demonstrate that chemically active binders can in situ bond to the polysulfides in the electrode. Besides the common binding functions of the cathode materials to the current collector, the covalent bonding between binders and polysulfides could bestow the higher capacity, stable cycling and high coulombic efficiency, even under the high loading of sulfur contents. Thus, this study provides an alternative and effective way in solving the shuttle effect of the dissolved lithium polysulfides for Li-S batteries.

    更新日期:2018-09-11
  • Hot corrosion of Gd2O3-doped CeO2 electrolyte in solid oxide fuel cells with a liquid antimony anode
    J. Power Sources (IF 6.945) Pub Date : 2018-09-11
    Jiyang Ma, Nanqi Duan, Yue Han, Dong Yan, Bo Chi, Jian Pu, Jian Li

    Direct carbon solid oxide fuel cell has garnered increasingly attention due to its high conversion efficiency. However, when a liquid metal is used as the anode, the electrolyte is subjected to hot corrosion by the liquid metal and its oxide. In the present study, both chemical and electrochemical corrosions of Gd2O3-doped CeO2 electrolyte by liquid Sb and Sb2O3 are conducted at 750 °C for up to 100 h to simulate the situations occurring in the direct carbon solid oxide fuel cell. The tested specimens are characterized by a scanning electron microscope and an electron probe micro-analyzer. In the case of chemical corrosion, both liquid Sb and Sb2O3 penetrates into grain boundaries of the electrolyte, resulting spallation of grains from the bulk. The depth of liquid Sb penetration is deeper than that of liquid Sb2O3. Electrochemical corrosion of the electrolyte by liquid Sb occurs in the same way as the chemical corrosion at an increased rate promoted by applied current. It is also found that the electrochemical corrosion of the electrolyte by liquid Sb improves the cell performance with the sacrifice of electrolyte.

    更新日期:2018-09-11
  • Electrochemical reactions of AgFeO2 as negative electrode in Li- and Na-ion batteries
    J. Power Sources (IF 6.945) Pub Date : 2018-09-10
    Pedro Berastegui, Cheuk-Wai Tai, Mario Valvo
    更新日期:2018-09-11
  • Heteroatom doped porous carbon sheets derived from protein-rich wheat gluten for supercapacitors: The synergistic effect of pore properties and heteroatom on the electrochemical performance in different electrolytes
    J. Power Sources (IF 6.945) Pub Date : 2018-09-10
    Shao-Wen Xu, Yong-Qing Zhao, Yi-Xuan Xu, Qing-Han Chen, Guo-Qing Zhang, Qian-Qian Xu, Dan-Dan Zhao, Xuan Zhang, Cai-Ling Xu
    更新日期:2018-09-10
  • Thermally driven convection in Li||Bi liquid metal batteries
    J. Power Sources (IF 6.945) Pub Date : 2018-09-10
    Paolo Personnettaz, Pascal Beckstein, Steffen Landgraf, Thomas Köllner, Michael Nimtz, Norbert Weber, Tom Weier

    Liquid Metal Batteries (LMBs) are a promising concept for cheap electrical energy storage at grid level. These are built as a stable density stratification of three liquid layers, with two liquid metals separated by a molten salt. In order to ensure a safe and efficient operation, the understanding of transport phenomena in LMBs is essential. With this motivation we study thermal convection induced by internal heat generation. We consider the electrochemical nature of the cell in order to define the heat balance and the operating parameters. Moreover we develop a simple 1D heat conduction model as well as a fully 3D thermo-fluid dynamics model. The latter is implemented in the CFD library OpenFOAM, extending the volume of fluid solver, and validated against a pseudo-spectral code. Both models are used to study a rectangular 10×10 cm² Li||Bi LMB cell at three different states of charge.

    更新日期:2018-09-10
  • Development of tubular anode-supported solid oxide fuel cell cell and 4-cell-stack based on lanthanum gallate electrolyte membrane for mobile application
    J. Power Sources (IF 6.945) Pub Date : 2018-09-08
    Jiao Ding, Xiangyang Zhou, Qihai Liu, Guoqiang Yin

    Anode-supported tubular solid oxide fuel cells and 4-cell-stack with lanthanum-doped ceria barrier layer and strontium, magnesium doped lanthanum gallate tri-layer electrolytes membrane are investigated. The single cell exhibits peak power densities of 1061 mW cm−2 and 917 mW cm−2 at 800 °C fueled with bubbled hydrogen and methane (3 vol % water), respectively. Energy dispersive X-ray detector result demonstrates that no measurable carbon is detected in the anode directly operated in methane during the whole testing process.The 4-cell-stack assembled with single cells provides maximum output power of 1.66 W and open circuit voltage of 3.13 V at 800 °C with hydrogen as fuel. While the 4-cell-stack presents maximum output power of 1.38 W and open circuit voltage of 3.88 V at 800 °C fueled with methane. A stability test of each cell in 4-cell-stack is developed at constant current densities (J = 0 A cm−2, J = 0.1 A cm−2, J = 0.4 A cm−2) directly fueled with 75 ml min−1 methane at 800 °C. The results show that the voltages of each cell in 4-cell-stack stabilize during the whole durability test. The results demonstrate that the stability and dependability of 4-cell-stack is good, and it is promising for mobile application of intermediate temperature solid oxide fuel cells.

    更新日期:2018-09-10
  • Fluorine-substituted ionic liquid for Si anode in Li-ion battery
    J. Power Sources (IF 6.945) Pub Date : 2018-09-08
    Fang Men, Yanbo Yang, Yuhan Shang, Haibo Zhang, Zhiping Song, Yunhong Zhou, Xiaohai Zhou, Hui Zhan

    N-methylpyrrolidinium-based ionic liquid, with fluorine function group, N-(2-fluoroethyl) N-methylpyrrolidinium bis(trifluoromethanesulfonyl)imide is proposed as the co-solvent for Si anode. Scanning electron microscope, X-ray photoelectron spectroscopy as well as the impedance measurement is conducted to investigate its effect on the solid electrolyte interface formation. Cycling tests show that it can much better improve the cycling stability of Si than fluoroethylene carbonate or F-free ionic liquid analogue.

    更新日期:2018-09-10
  • Template-determined microstructure and electrochemical performances of Li-rich layered metal oxide cathode
    J. Power Sources (IF 6.945) Pub Date : 2018-09-08
    Yuanyuan Tian, Min Chen, Shida Xue, Youxuan Cai, Qiming Huang, Xiang Liu, Weishan Li

    This report unravels the dependence of the microstructure and electrochemical performances of Li-rich layered transition metal oxide (LLMO) on the molecular structure of polymer templates for the formation of oxalate precursor. A representative LLMO, Li1.2Mn0.54Ni0.13Co0.13, is synthesized by co-precipitation method, and three samples, LLMO-PVP, LLMO-PEG and LLMO-PVA, are obtained with polymer templates, polyvinyl pyrrolidone (PVP), polyethyleneglycol (PEG) and polyvinyl alcohol (PVA), respectively. The physical and chemical properties of the resulting products are analyzed with SEM, TEM, XRD, BET, ICP, and XPS, and their electrochemical performances as cathode of Li-ion battery are evaluated with EIS, GITT and charge/discharge tests. It is found that LLMO-PVP exhibits the best performances, followed by LLMO-PEG, while LLMO-PVA behaves poorest. This difference is ascribed to the various microstructures of the resulting products, which are determined by the molecular structure of polymer templates.

    更新日期:2018-09-10
  • Bimetal-decorated nanocarbon as a superior electrocatalyst for overall water splitting
    J. Power Sources (IF 6.945) Pub Date : 2018-09-07
    Jian Wang, Yang Gao, Tsam Lung You, Francesco Ciucci
    更新日期:2018-09-09
  • High-performing and stable electricity generation by ceramic fuel cells operating in dry methane over 1000 hours
    J. Power Sources (IF 6.945) Pub Date : 2018-09-07
    Hanping Ding, Shumin Fang, Yingchao Yang, Yating Yang, Wei Wu, Zetian Tao

    Developing a reliable and high-performing direct hydrocarbon symmetric solid oxide fuel cells (SSOFCs) is promising to achieve the simple and durable operation in natural gas. Here we demonstrate a durable SSOFC with a ceramic oxide material simultaneously used as symmetric electrode that performs outstandingly in dry methane at anode side and ambient air at cathode side. This cell shows high performance with strong resistances against both coking and sulfur poisoning in dry fuel without any steam as reforming agent. At 800 °C, the cell exhibits a low polarization resistance of 0.027 Ω cm2 in air and 0.074 Ω cm2 in 5% H2. When the cell is further optimized by implementing a nanostructured electrode, the high peak power densities of 1.05 W cm−2 in H2 and 0.4 W cm−2 in CH4 are achieved at 800 °C. To our best knowledge, this is the highest performance among SSOFCs using ceramic oxide as symmetric electrode in dry methane. The cell exhibits a very stable performance under a constant current load of 1.0 A cm−2 for 1060 h with even slight performance increase. In addition, the electrode is structurally stable in various fuels, suggesting that the cell can be operated in flexible gas conditions.

    更新日期:2018-09-09
  • Improvement in the performance of inverted planar perovskite solar cells via the CH3NH3PbI3-xClx:ZnO bulk heterojunction
    J. Power Sources (IF 6.945) Pub Date : 2018-09-06
    Zhiyong Liu, Tingwei He, Huihui Wang, Sagar M. Jain, Kaikai Liu, Jien Yang, Na Zhang, Hairui Liu, Mingjian Yuan
    更新日期:2018-09-09
  • Controllable synthesis of core-branch Ni3S2/Co9S8 directly on nickel foam as an efficient bifunctional electrocatalyst for overall water splitting
    J. Power Sources (IF 6.945) Pub Date : 2018-09-08
    Jinghuang Lin, Haohan Wang, Xiaohang Zheng, Yue Du, Changyao Zhao, Junlei Qi, Jian Cao, Weidong Fei, Jicai Feng
    更新日期:2018-09-09
  • Selection of thermal management system for modular battery packs of electric vehicles: A review of existing and emerging technologies
    J. Power Sources (IF 6.945) Pub Date : 2018-09-07
    Shashank Arora

    Li-ion battery cells are temperature sensitive devices. Their performance and cycle life are compromised under extreme ambient environment. Efficient regulation of cell temperature is, therefore, a pre-requisite for safe and reliable battery operation. In addition, modularity-in-design of battery packs is required to offset high manufacturing costs of electric vehicles (EVs). However, modularity of battery packs is restricted by flexibility of traditionally used battery thermal management systems. For example, scalability of liquid cooled battery packs is limited by plumbing or piping and the auxiliary equipment used in the system. An alternative thermal management system is, therefore, required for modular EV battery packs.In this paper, state-of-the-art developed to control battery temperature near a pre-specified state is qualitatively reviewed with the intent to identify potential candidate for implementation in a modular architecture. Some of the novel techniques that provide high-scalability in addition to appreciable cost and energy-savings over traditional methods are also evaluated while considering the development state and associated technical risks. It is found that only a hybrid system can meet technical requirements imposed by modular design. Based on the current state, phase change materials and thermoelectric devices are more likely to be part of this next generation thermal management system.

    更新日期:2018-09-09
  • A comprehensive review on a passive (phase change materials) and an active (thermoelectric cooler) battery thermal management system and their limitations
    J. Power Sources (IF 6.945) Pub Date : 2018-09-05
    Abu Raihan Mohammad Siddique, Shohel Mahmud, Bill Van Heyst

    A battery thermal management system (BTMS) has become an essential part in battery-driven electric vehicles (EVs) in order to remove the generated heat from the battery which leads to enhanced performance. BTMSs have been implemented in EVs by adopting different technologies that include natural air cooling systems, forced air cooling systems, liquid cooling systems, and using heat pipes and fins. However, phase change material (PCM) embedded systems have gained a lot of attention due to their availability, low cost, and high sensible and latent heat in the field of BTMS. In the last two decades, thermoelectric coolers (TECs) have also been applied to BTMSs to make an active or semi-passive system with another cooling system. In this paper, a state of the science comprehensive literature review is presented on PCM (a passive system) and TEC (an active system) based BTMSs. A synthesis of the literature is presented in a tabular format to give a clear indication on the relative performances of the BTMSs. Moreover, limitations of the batteries, PCMs, and TECs are also discussed to identify the future research possibilities in the area of BTMS for EVs.

    更新日期:2018-09-07
  • 更新日期:2018-09-07
  • Puzzles and confusions in supercapacitor and battery: Theory and solutions
    J. Power Sources (IF 6.945) Pub Date : 2018-09-05
    Jiale Xie, Pingping Yang, Yi Wang, Tao Qi, Yong Lei, Chang Ming Li
    更新日期:2018-09-07
  • Constructing in-chip micro-supercapacitors of 3D graphene nanowall/ruthenium oxides electrode through silicon-based microfabrication technique
    J. Power Sources (IF 6.945) Pub Date : 2018-09-05
    Jinhua Li, Minjie Zhu, Zhonglie An, Zhuqing Wang, Masaya Toda, Takahito Ono
    更新日期:2018-09-07
  • Tunable eutectic structure and de-/hydrogenation behavior via Cu substitution in Mg-Ni alloy
    J. Power Sources (IF 6.945) Pub Date : 2018-09-05
    Ruirun Chen, Xin Ding, Xiaoyu Chen, Xinzhong Li, Jingjie Guo, Yanqing Su, Hongsheng Ding, Hengzhi Fu
    更新日期:2018-09-07
  • Carbon nanotubes as durable catalyst supports for oxygen reduction electrode of proton exchange membrane fuel cells
    J. Power Sources (IF 6.945) Pub Date : 2018-09-06
    Byung-Chul Cha, Shinhee Jun, Bora Jeong, Mohammadamin Ezazi, Gibum Kwon, Daeil Kim, Duck Hyun Lee
    更新日期:2018-09-07
  • High-density active sites porous Fe/N/C electrocatalyst boosting the performance of proton exchange membrane fuel cells
    J. Power Sources (IF 6.945) Pub Date : 2018-09-06
    Rui Wu, Yujie Song, Xun Huang, Siguo Chen, Shumaila Ibraheem, Jianghai Deng, Jing Li, Xueqiang Qi, Zidong Wei

    Presently, the practical application of Fe/N/C catalysts as replacements of Pt for oxygen reduction reaction is still limited by insufficient activity. Herein, we demonstrate a novel design for such catalyst. On one hand, the obtained Fe/N/CSiO2ZnCl2 catalyst owns high densities of well-exposed active-sites derived from three-dimensional well-balanced macro-, meso-, and microporous structures constructed by adopting ZnCl2 salt and SiO2 microspheres as combined templates. On the other hand, simulation reveals that a high loading of catalyst in cathode catalyst layer would not benefit cell performance and fast oxygen reduction reaction process occurs only inside a limited thickness of catalyst layer. Particularly, the Fe/N/CSiO2ZnCl2 shows a maximal output power density as high as 480 mW cm−2 at an ultra-low loading of 0.5 mg cm−2. This study firstly exhibits that development of catalysts with high-density active sites and construct of ultra-thin catalyst layer are of great significance for improving the performance of fuel cell.

    更新日期:2018-09-07
  • Efficient strategy for significantly decreasing overpotentials of hydrogen generation via oxidizing small molecules at flexible bifunctional CoSe electrodes
    J. Power Sources (IF 6.945) Pub Date : 2018-09-05
    Zonghua Pu, Ibrahim Saana Amiinu, Fangliang Gao, Zhenzhu Xu, Chengtian Zhang, Wenqiang Li, Guoqiang Li, Shichun Mu
    更新日期:2018-09-07
  • Hierarchical ZnO microspheres photoelectrodes assembled with Zn chalcogenide passivation layer for high efficiency quantum dot sensitized solar cells
    J. Power Sources (IF 6.945) Pub Date : 2018-09-05
    Fei Huang, Hao Tang, Yuan Wang, Juan Hou, Zhaoyu Liu, Robert C. Massé, Jianjun Tian, Guozhong Cao

    The power conversion efficiency of quantum dot sensitized solar cells with ZnO as photoelctrode is relatively low, largely due to high charge recombination rate at the ZnO surface. This paper reports high-efficiency hierarchical ZnO microspheres photoelectrodes with appropriate Zn chalcogenide passivation layers (ZnO@ZnS and ZnO@ZnSe) were constructed for reducing charge recombination of the resultant QDSCs. They were fabricated via a facile chemical solution route without any template or high temperature condition followed with controlled ion exchange. ZnS or ZnSe serves as passivation layer in CdS/CdSe QDSCs and their influences on the charge recombination as well as the light absorption were investigated. It was found that the ZnS or ZnSe passivation layer can effectively reduce charge recombination and significantly enhance the fill factor and open circuit voltage of the resulting QDSCs. Both of ZnS and ZnSe passivation layers enhanced the overall performance of the resultant QDSCs, which generated high power conversion efficiency of 5.13% and 5.20%, present 52% and 55% enhancement compared with 3.36% for the solar cell with hierarchical ZnO microspheres photoelectrode. ZnSe appears more favoring the deposition of QDs and enhancing the light absorbance than ZnS, resulting in an increased photocurrent density.

    更新日期:2018-09-07
  • Synthesis and electrochemical properties of partially fluorinated ether solvents for lithiumsulfur battery electrolytes
    J. Power Sources (IF 6.945) Pub Date : 2018-09-05
    Zheng Yue, Hamza Dunya, Shankar Aryal, Carlo U. Segre, Braja Mandal

    Fluorinated ethers have been used as a co-solvent in traditional ether-based electrolytes to suppress the polysulfide shuttle effect in lithium-sulfur batteries. In this work, five partially fluorinated ether compounds have been synthesized. The key properties, such as viscosity, ionic conductivity and polysulfide solubility of the electrolytes containing these co-solvents have been systematically studied. The electrolyte formulation showed best physical properties was tested in lithium-sulfur coin cells. The new fluoroether-based electrolytes displayed superior electrochemical performance compared to that of the traditional ether-based electrolytes.

    更新日期:2018-09-07
  • Sandwich architecture of SnSnSb alloy nanoparticles and N-doped reduced graphene oxide sheets as a high rate capability anode for lithium-ion batteries
    J. Power Sources (IF 6.945) Pub Date : 2018-09-05
    Sambedan Jena, Arijit Mitra, Arghya Patra, Srijan Sengupta, Karabi Das, Subhasish B. Majumder, Siddhartha Das
    更新日期:2018-09-07
  • Cation mixing in LiNi0.8Co0.15Al0.05O2 positive electrode material studied using high angular resolution electron channeling X-ray spectroscopy
    J. Power Sources (IF 6.945) Pub Date : 2018-09-05
    Yu Yamamoto, Masahiro Ohtsuka, Yosuke Azuma, Teruo Takahashi, Shunsuke Muto
    更新日期:2018-09-07
  • Performance of plug-in hybrid electric vehicle under low temperature condition and economy analysis of battery pre-heating
    J. Power Sources (IF 6.945) Pub Date : 2018-09-05
    Tianze Wang, Xiaogang Wu, Shaobing Xu, Heath Hofmann, Jiuyu Du, Jianqiu Li, Minggao Ouyang, Ziyou Song

    This paper presents a performance analysis of plug-in hybrid electric vehicles (PHEVs) considering battery preheating economy under low temperature conditions. In subzero temperature environments, PHEVs suffer a dramatic loss of all-electric driving range due to the energy and power reduction of LiFePO4 batteries, as well as severe battery degradation due to lithium ion plating. This decreases the battery life time and thus increases the operating cost of the PHEV. A quasi-static model is adopted for the simulated bus, and a battery dynamic degradation model is established based on the Arrhenius degradation theory. The PHEV performance under low-temperature conditions is evaluated considering three factors: fuel cost, electricity cost, and battery degradation cost. In addition, the economics of battery preheating powered by the engine or grid is first investigated in this paper. The charge depleting-charge sustaining energy management strategy and convective heating method are adopted. Simulation results show that the preheating strategy can reduce the PHEV operating cost by up to 22.3% in 40 Harbin driving cycles. The heating process becomes increasingly necessary as the battery price, heating efficiency, and daily recharging time of the PHEV increase as well as the environment temperature decreases.

    更新日期:2018-09-07
  • Systematic investigation of the Binder's role in the electrochemical performance of tin sulfide electrodes in SIBs
    J. Power Sources (IF 6.945) Pub Date : 2018-09-05
    Zhongtao Ma, Yingchun Lyu, Hangsheng Yang, Qianqian Li, Bingkun Guo, Anmin Nie
    更新日期:2018-09-07
  • Comparing the emissions benefits of centralized vs. decentralized electric vehicle smart charging approaches: A case study of the year 2030 California electric grid
    J. Power Sources (IF 6.945) Pub Date : 2018-09-05
    Aaron J. Cheng, Brian Tarroja, Brendan Shaffer, Scott Samuelsen

    Grid communicative “smart” charging of electric vehicles can provide significant benefits for maximizing the emission reductions provided by the large-scale use of these vehicles. While decentralized approaches to smart charging can be practical to implement in real systems, it is unclear whether these provide the same benefits for the electric grid as those identified by centralized approaches in the literature. This study compares the CO2 and NOx reduction benefits, and cost and grid capacity benefits, achieved by decentralized and centralized electric vehicle smart charging by modeling two different smart charging algorithms in battery electric vehicles and characterizing their effect on the operation and dispatch of electric grid resources and subsequently electric grid CO2 and NOx emissions. Decentralized approaches were found to provide the same CO2 emissions benefits and within 2% of the NOx emissions benefits achieved with centralized approaches, but only if the frequency of communication between vehicles and the electric grid is sufficiently high (less than 60 min). The difference in NOx emission is associated with the increased load variability caused by less frequent communication in decentralized smart charging resulting in higher power plant startup events. Finally, costs and grid capacity needs are increased without frequent grid communication.

    更新日期:2018-09-07
  • Towards a high-rate and long-life LiVPO4F/C cathode material for lithium ion batteries by potassium and zirconium co-doping
    J. Power Sources (IF 6.945) Pub Date : 2018-09-05
    Jiebing Wu, Youlong Xu, Yanjun Chen, Long Li, Hui Wang, Jing Zhao
    更新日期:2018-09-05
  • High temperature polymer electrolyte membrane fuel cells with Polybenzimidazole-Ce0.9Gd0.1P2O7 and polybenzimidazole-Ce0.9Gd0.1P2O7-graphite oxide composite electrolytes
    J. Power Sources (IF 6.945) Pub Date : 2018-09-05
    Bhupendra Singh, Nitika Devi, Avanish Kumar Srivastava, Rajesh K. Singh, Sun-Ju Song, N. Nambi Krishnan, Anastasiia Konovalova, Dirk Henkensmeier

    In this work, polybenzimidazole based composite membranes are fabricated using polybenzimidazole, Ce0.9Gd0.1P2O7 and graphite oxide by solution casting procedure. The microstructural, mechanical and electrical properties of the phosphoric acid-doped composite membranes are characterized for fuel cell applications. Addition of graphite oxide in the composite leads to improvement in homogeneous dispersion of higher amount, 31 wt%, of Ce0.9Gd0.1P2O7. With the increasing amount of Ce0.9Gd0.1P2O7 in the composite membranes the amount of phosphoric acid loading decreases, but the proton conductivity of the composite membrane is higher than that is reported for the phosphoric acid-doped polybenzimidazole membranes. At 180 °C, a maximum conductivity of 182 mS cm−1 for polybenzimidazole/Ce0.9Gd0.1P2O7 membrane with 24 wt% Ce0.9Gd0.1P2O7 and 199 mS cm−1 for polybenzimidazole/Ce0.9Gd0.1P2O7/graphite oxide membrane with 31 wt% Ce0.9Gd0.1P2O7 is observed. The H2-Air fuel cells operating at 160 °C with ∼250 μm thick polybenzimidazole/Ce0.9Gd0.1P2O7 electrolyte shows open circuit voltage of 0.938 V and maximum power density of 255 mW cm−2 with 640 mA cm−2 current at 160 °C whereas the corresponding values with ∼200 μm thick polybenzimidazole/Ce0.9Gd0.1P2O7/graphite oxide membrane are 0.976 V and 307 mW cm−2 with 800 mA cm−2 current, respectively. However, irrespective of the increased conductivity at the higher temperatures, the maximum power density decreases with increasing temperature >160 °C.

    更新日期:2018-09-05
  • 更新日期:2018-09-05
  • P2 manganese rich sodium layered oxides: Rational stoichiometries for enhanced performance
    J. Power Sources (IF 6.945) Pub Date : 2018-09-04
    Elena Gonzalo, Nagore Ortiz-Vitoriano, Nicholas E. Drewett, Begoña Acebedo, Juan Miguel López del Amo, Francisco J. Bonilla, Teófilo Rojo

    Sodium layered oxide materials have shown excellent performance as cathodes in sodium ion batteries, due to their flexibility, versatility, and intrinsically fast Na ion structural diffusion which leads to enhanced rate capability. In this work, we have examined two strategies to mitigate Jahn-Teller distortion and boost the performance of these systems: substituting with electrochemically active (e.g. Fe) and doping with electrochemically inactive materials (e.g. Zn). Here, Mn-rich P2- phase Na2/3Mn0.8M0.1M′0.1O2 (M, M’ = Fe3+, Al3+, Zn2+, Cu2+, Ti4+) materials are synthesized from earth abundant precursors, via solid state-reaction, and characterized by X-ray diffraction, scanning electron microscopy and solid state NMR. The materials demonstrated a superior combination of capacity retention (74–94%) and specific charge at C/10 (∼130–159 mAh g−1) and 1C (∼87–101 mAh g−1) in the studied voltage window (2–4 V vs. Na+/Na). Thus, this work represents not only a new family of high-performance materials, but also validation for the rational design approaches used herein.

    更新日期:2018-09-05
  • Reversible thixotropic gel electrolytes for safer and shape-versatile lithium-ion batteries
    J. Power Sources (IF 6.945) Pub Date : 2018-09-04
    Ju Young Kim, Dong Ok Shin, Se-Hee Kim, Jun Ho Lee, Kwang Man Kim, Jimin Oh, Jumi Kim, Myeong Ju Lee, Yil-Suk Yang, Sang-Young Lee, Je Young Kim, Young-Gi Lee

    All-solid-state lithium-ion batteries (ASLBs) are receiving considerable attention due to their safety superiority and high energy density (achieved by bipolar configuration). Inorganic solid electrolytes are explored as a key-enabling material of the ASLBs. However, their critical challenges, including grain boundary resistance, interfacial instability with electrode materials and complicated processability, remain yet unresolved. Here, we demonstrate a new class of gel electrolyte with reversible thixotropic transformation and abuse tolerance as an effective and scalable approach to address the aforementioned longstanding issues. The gel electrolyte consists of (fluoropolymer/cellulose derivative) matrix and liquid electrolyte. The reversible thixotropic transformation is realized via sol-gel transition based on Coulombic interaction of the polymer matrix with liquid electrolyte. This unusual rheological feature allows the gel electrolyte to be printed in various forms. In addition, the gel electrolyte shows low crystallinity, thus playing a viable role in delivering high ionic conductivity. Based on understanding of rheological/electrochemical characteristics of the gel electrolyte, we fabricate a form factor-free pouch-type cell assembled with the gel electrolyte using sequential screen-printing process. The resultant cell shows exceptional safety upon exposure to various harsh abuse conditions, along with decent electrochemical performance.

    更新日期:2018-09-05
  • Li4Ti5O12/activated-carbon hybrid anodes prepared by in situ copolymerization and post-CO2 activation for high power Li-ion capacitors
    J. Power Sources (IF 6.945) Pub Date : 2018-09-04
    Chunhai Jiang, Jing Zhao, Huiqing Wu, Zhimin Zou, Renzhong Huang

    Hybrid anodes with Li4Ti5O12 nanoparticles uniformly embedding in a mesoporous activated carbon matrix are prepared by CO2 activation of copolymerized resorcinol and hexamethylenetetramine loaded by lithium acetate and tetrabutyl titanate. The Li4Ti5O12/activated-carbon hybrid anodes show increased capacity retention as the activated carbon content in the composite increases, although their overall specific capacity decreases gradually. The hybrid anode with an activated-carbon content of 54 wt% exhibits the highest capacity retention of 67% at 4 A g−1 referencing to that at 0.1 A g−1. When coupling it with commercial AC cathode, the Li-ion capacitor displays an outstanding high energy density of 38 Wh kg−1 even at a high power density of 7964 W kg−1. Moreover, an energy density retention of 90.8% after 2000 cycles at 1 A g−1 is preserved, demonstrating its very stable cycle performance. The results reported in this work indicate that the Li4Ti5O12/activated-carbon hybrids prepared by the proposed copolymerization and post-activation process may be very promising anode materials of Li-ion capacitors designed for high power applications.

    更新日期:2018-09-05
  • In-situ investigation of pressure effect on structural evolution and conductivity of Na3SbS4 superionic conductor
    J. Power Sources (IF 6.945) Pub Date : 2018-09-02
    Hui Wang, Ming Yu, Yan Wang, Zhenxing Feng, Yingqi Wang, Xujie Lü, Jinlong Zhu, Yang Ren, Chengdu Liang

    Sulfide-based conductors are one class of the most promising solid electrolytes for next-generation of all-solid-state batteries due to their advantages on high ionic conductivity and favorable mechanical properties of easy densification. Besides new material chemistry to be explored, understanding the pressure effect on structure and property is equally important from both fundamental and practical considerations, as pressure is one way to tune the properties of such solid electrolytes. Here we report the pressure-driven structural evolution and conductivity change of Na3SbS4 solid electrolyte through the integration of molecular dynamics (MD) simulation and in-situ experiments. Theoretical calculation predicts that no phase transition happens to tetragonal Na3SbS4 under 10 GPa isotopically pressure. Synchrotron X-ray diffraction and Raman results confirm that Na3SbS4 keeps stable tetragonal structure but shows anisotropic compressibility along different directions. After pressure release, the ionic conductivity of Na3SbS4 increases by four folds to 1.6 mS cm−1, which is resulted from the dramatic decrease of grain boundary resistance.

    更新日期:2018-09-03
  • Study of mechanical degradation of sulfonated poly (ether ether ketone) membrane using ex-situ hygrothermal cycles for polymer electrolyte fuel cell application
    J. Power Sources (IF 6.945) Pub Date : 2018-08-31
    Seyed Hesam Mirfarsi, Aida Karimi, Soosan Rowshanzamir, Mohammad Javad Parnian

    In this study, an ex-situ method is used to investigate the mechanical degradation of sulfonated poly (ether ether ketone) membranes. The mechanical degradation is carried out by hygrothermal cycles test in different cycles as 1 s t to 10 t h cycles as a function of temperature and relative humidity for 700 min. The water uptake, dimensional stability, mechanical properties, and hydrogen crossover through specimens of degraded membranes are investigated after different cycle numbers. Additionally, morphological and structural characterizations included field emission scanning electron microscopy, atomic force microscopy, and X-ray diffraction are employed for understanding of mechanical degradation effects on SPEEK membranes properties. Results suggest that SPEEK membrane due to simultaneous creep and exposure to elevated temperatures and various humidity levels encounters microstructural rearrangement. The mechanical results show the ultimate tensile strengths and Young modules of SPEEK membranes increase and SPEEKs' toughness drops by approximately 80% at the end of the experiment and they act more brittle in the tensile test. Moreover, the AFM results show preexistent dead-end hydrophilic domains join each other to form more hydrophilic morphology within SPEEK and accordingly, water uptake increases. Furthermore, hydrogen crossover rate increases due to thinning and micro-flaws formation in the thickness direction and morphology evolution.

    更新日期:2018-09-03
  • A sustainable approach for scalable production of α-Fe2O3 nanocrystals with 3D interconnected porous architectures on flexible carbon textiles as integrated electrodes for lithium-ion batteries
    J. Power Sources (IF 6.945) Pub Date : 2018-08-31
    Wan-Sheng Xiong, Yun Jiang, Yu Xia, Yuyang Qi, Weiwei Sun, Cheng-Long Hu, Rong-Xiang He, Bolei Chen, Yumin Liu, Xing-Zhong Zhao
    更新日期:2018-09-03
  • A critical review on self-adaptive Li-ion battery ageing models
    J. Power Sources (IF 6.945) Pub Date : 2018-09-01
    M. Lucu, E. Martinez-Laserna, I. Gandiaga, H. Camblong

    The prediction accuracy of Lithium-ion (Li-ion) battery ageing models based on laboratory data is uncertain in the context of online prediction. This is due to the difficulty to reproduce realistic operating profiles in laboratory. The development of self-adaptive ageing models, which are updated using the ageing data obtained in operation, allows enhancing the online prediction accuracy and reducing the required characterisation period in laboratory. At the same time, it offers the possibility to maximise systems' profitability, providing useful information to update the energy management strategy and for predictive maintenance purposes.The present study aims at reviewing, classifying and comparing the different self-adaptive Li-ion battery ageing models proposed in the literature. Firstly, the different characteristics influencing the ability of a model to update itself are identified, and a classification is proposed for self-adaptive Li-ion battery ageing modelling methods. Secondly, specific criteria are defined to assess and compare the accuracy and computational cost of the different models, enabling a selection of the most suitable ones. Finally, relevant conclusions are drawn considering the key features required to achieve effective ageing predictions, and concise recommendations are suggested for future self-adaptive Li-ion battery ageing model development.

    更新日期:2018-09-03
  • A new AB4-type single-phase superlattice compound for electrochemical hydrogen storage
    J. Power Sources (IF 6.945) Pub Date : 2018-09-01
    Lu Zhang, Wenfeng Wang, Ismael A. Rodríguez-Pérez, Yumeng Zhao, Zeru Jia, Yuan Li, Shumin Han, Li-Min Wang
    更新日期:2018-09-03
  • Structural engineering of S-doped Co/N/C mesoporous nanorods via the Ostwald ripening-assisted template method for oxygen reduction reaction and Li-ion batteries
    J. Power Sources (IF 6.945) Pub Date : 2018-08-31
    Wanxin She, Juan Wang, Xiangyu Zhang, Mingchen Sun, Chuyi Xie, Junwu Xiao, Shuai Wang
    更新日期:2018-09-03
  • Grafted polyrotaxanes as highly conductive electrolytes for lithium metal batteries
    J. Power Sources (IF 6.945) Pub Date : 2018-08-31
    Laura Imholt, Tobias S. Dörr, Peng Zhang, Lukas Ibing, Isidora Cekic-Laskovic, Martin Winter, Gunther Brunklaus
    更新日期:2018-09-03
  • Tellurophene-based metal-organic framework nanosheets for high-performance organic solar cells
    J. Power Sources (IF 6.945) Pub Date : 2018-08-31
    Wang Xing, Pan Ye, Jian Lu, Xiaoxi Wu, Yusheng Chen, Ting Zhu, Aidong Peng, Hui Huang
    更新日期:2018-08-31
  • Oxidation resistance optimization of TiC/hastelloy composites by adding Ta element applied for intermediate temperature solid oxide fuel cell interconnects
    J. Power Sources (IF 6.945) Pub Date : 2018-08-31
    Qian Qi, Lujie Wang, Yan Liu, Zhengren Huang

    Excellent oxidation resistance is one crucial requirement for intermediate-temperature solid oxide fuel cell interconnects. Composites with proper coefficient of thermal expansion and good electrical conductivity have been proposed as promising intermediate-temperature solid oxide fuel cell interconnects, whereas the oxidation resistance of them is still need to be improved. In the paper, the TiC/hastelloy composites with minor Ta element are prepared by in-situ reactive infiltration method, and the mass gain decreases from 1.18 mg cm−2 to 0.48 mg cm−2 (800 °C/100 h) by adding minor Ta, which is the lowest among existing composite interconnects. The oxide scale composed of Ni/Ti/Cr oxides with sandwich structure is formed on the composites. Compared with TiC/hastelloy composites without Ta element, Ta effectively prevents the inward diffusion of oxygen during oxidation by reducing oxygen vacancy concentration in TiO2 layer, and the inner oxide layer (O diffusion layer) vanishes, leading to the oxidation resistance optimization of composites. Meanwhile, the composites with Ta show linear suitable thermal expansion, 11.6 × 10−6 °C−1, and high electrical conductivity, 5500 S cm−1. Therefore, the addition of minor Ta element is one effective method to optimize the oxidation resistance of TiC/hastelloy composites.

    更新日期:2018-08-31
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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