当前位置：
X-MOL 学术
›
ChemElectroChem
›
论文详情
Our official English website, www.x-mol.net, welcomes your
feedback! (Note: you will need to create a separate account there.)
Boosting the Oxygen Reduction Performance via Tuning the Synergy between Metal Core and Oxide Shell of Metal−Organic Frameworks‐Derived Co@CoOx
ChemElectroChem ( IF 3.5 ) Pub Date : 2020-03-11 , DOI: 10.1002/celc.202000038 Hao Wang 1 , Rong‐Hui Kou 2 , Qiu Jin 1 , Yu‐Zi Liu 3 , Feng‐Xiang Yin 4 , Cheng‐Jun Sun 2 , Liang Wang 2 , Zhi‐Yuan Ma 2 , Yang Ren 2 , Ning Liu 1 , Biao‐Hua Chen 1
ChemElectroChem ( IF 3.5 ) Pub Date : 2020-03-11 , DOI: 10.1002/celc.202000038 Hao Wang 1 , Rong‐Hui Kou 2 , Qiu Jin 1 , Yu‐Zi Liu 3 , Feng‐Xiang Yin 4 , Cheng‐Jun Sun 2 , Liang Wang 2 , Zhi‐Yuan Ma 2 , Yang Ren 2 , Ning Liu 1 , Biao‐Hua Chen 1
Affiliation
|
Co core@Co oxide shell (Co@CoOx) catalysts represent a large family with promising oxygen reduction reaction (ORR) catalytic activity. However, inadequate understanding of Co@CoOx synergy prohibits further pursuit of catalytic performance enhancement. Herein, a Co zeolitic−imidazolate framework was converted into metallic Co, followed by controlled air treatment to form Co@CoOx. The composition and structure evolution as a function of air treatment temperature were studied thoroughly through conventional and synchrotron (both ex‐situ and in‐situ) characterizations, confirming the coexistence of CoO and Co3O4 in the shell. The optimal catalyst showed an ORR half‐wave potential of 0.87 V (vs. RHE) in an alkaline half‐cell and delivered high discharge capacity in an aprotic Li−O2 battery (7,124 mAh gCat+C−1) and an aqueous Zn−air battery (694 mAh gZn−1) with good performance retention after durability test. Modeling simulation and density functional theory calculation confirmed the charge donation from metal core to oxide shell and shed light on new insights of how metal@metal oxide synergy impacted the ORR via tuning the charge conductivity, oxygen affinity and intermediate transfer pathway. This work opens up a venue to boost ORR catalytic activity from an interfacial synergy perspective.
中文翻译：
通过调整金属有机框架衍生的Co @ CoOx的金属核与氧化物壳之间的协同作用来提高氧气还原性能
Co core @ Co氧化物壳（Co @ CoO x）催化剂代表着一个大家族，具有广阔的氧还原反应（ORR）催化活性。然而，对Co @ CoO x协同作用的了解不足，无法进一步追求催化性能的提高。在此，将Co-沸石-咪唑酸盐骨架转化为金属Co，然后进行受控的空气处理以形成Co @ CoO x。通过常规和同步加速器（异位和原位）表征，深入研究了成分和结构随空气处理温度的变化，证实了CoO和Co 3 O 4的共存在外壳中。最佳催化剂在碱性半电池中的ORR半波电势为0.87 V（vs. RHE），在非质子型Li-O 2电池（7,124 mAh g Cat + C -1）和水锌空气电池（694 mAh g锌-1），经耐久性测试后性能保持良好。建模仿真和密度泛函理论计算证实了从金属核到氧化物壳的电荷捐赠，并阐明了金属@金属氧化物协同作用如何通过调节电荷电导率，氧亲和力和中间转移途径如何影响ORR的新见解。这项工作从界面协同的角度开辟了一个增强ORR催化活性的场所。
更新日期：2020-03-12
中文翻译：
通过调整金属有机框架衍生的Co @ CoOx的金属核与氧化物壳之间的协同作用来提高氧气还原性能
Co core @ Co氧化物壳（Co @ CoO x）催化剂代表着一个大家族，具有广阔的氧还原反应（ORR）催化活性。然而，对Co @ CoO x协同作用的了解不足，无法进一步追求催化性能的提高。在此，将Co-沸石-咪唑酸盐骨架转化为金属Co，然后进行受控的空气处理以形成Co @ CoO x。通过常规和同步加速器（异位和原位）表征，深入研究了成分和结构随空气处理温度的变化，证实了CoO和Co 3 O 4的共存在外壳中。最佳催化剂在碱性半电池中的ORR半波电势为0.87 V（vs. RHE），在非质子型Li-O 2电池（7,124 mAh g Cat + C -1）和水锌空气电池（694 mAh g锌-1），经耐久性测试后性能保持良好。建模仿真和密度泛函理论计算证实了从金属核到氧化物壳的电荷捐赠，并阐明了金属@金属氧化物协同作用如何通过调节电荷电导率，氧亲和力和中间转移途径如何影响ORR的新见解。这项工作从界面协同的角度开辟了一个增强ORR催化活性的场所。
京公网安备 11010802027423号