文献类型：期刊文献

英文题名：Operando X-ray spectroscopy visualizing the chameleon-like structural reconstruction on an oxygen evolution electrocatalyst

作者：Cao, Dengfeng[1];Liu, Daobin[1,2];Chen, Shuangming[1];Moses, Oyawale Adetunji[1];Chen, Xingjia[1];Xu, Wenjie[1];Wu, Chuanqiang[1];Zheng, Lirong[3];Chu, Shengqi[3];Jiang, Hongliang[1,4];Wang, Changda[1];Ge, Binghui[5,6];Wu, Xiaojun[1];Zhang, Jing[3];Song, Li[1]

机构：[1]Univ Sci & Technol China, Dept Mat Sci & Engn,Synerget Innovat Quantum Info, Natl Synchrotron Radiat Lab,Hefei Natl Lab Phys S, CAS Key Lab Mat Energy Convers,CAS Ctr Excellence, Hefei 230026, Anhui, Peoples R China;[2]Nanyang Technol Univ, Sch Mat Sci & Engn, Singapore 639798, Singapore;[3]Chinese Acad Sci, Inst High Energy Phys, Beijing 100049, Peoples R China;[4]East China Univ Sci & Technol, Sch Chem Engn, Shanghai 200237, Peoples R China;[5]Anhui Univ, Inst Phys Sci & Informat Technol, Hefei 230601, Peoples R China;[6]Chinese Acad Sci, Inst Phys, Beijing Natl Lab Condensed Matter Phys, Beijing 100190, Peoples R China

年份：2021

卷号：14

期号：2

起止页码：906

外文期刊名：ENERGY & ENVIRONMENTAL SCIENCE

收录：;EI(收录号：20211010029588);WOS:【SCI-EXPANDED(收录号:WOS:000621101100030)】；

基金：This work was financially supported in part by National Key R&D Program of China (2017YFA0303500), NSFC (U1932201, 11574280, 21727801 and 51902303), NSFC-MAECI (51861135202), CAS Key Research Program of Frontier Sciences (QYZDB-SSW-SLH018), CAS International Partnership Program (211134-KYSB20190063) and CAS Collaborative Innovation Program of Hefei Science Center (2019HSC-CIP002) and CAS Iterdisciplinary Innovation Team. L. S. acknowledges the support from Key Laboratory of Advanced Energy Materials Chemistry (Ministry of Education), Nankai University (111 project, B12015). We thank the Beijing Synchrotron Radiation Facility (1W1B and Soft-X-ray endstation, BSRF), the Hefei Synchrotron Radiation Facility (Infrared Spectroscopy and Microspectroscopy, ARPES, MCD-A and MCD-B Soochow Beamline for Energy Materials, Photoemission and Catalysis/Surface Science Endstations at NSRL), and the USTC Center for Micro and Nanoscale Research and Fabrication for helps in characterizations.

语种：英文

外文关键词：Structural optimization - Electrolytes - Oxygen - X ray spectroscopy - Cobalt compounds - Sulfur compounds - Alkalinity - Catalyst activity - Energy conversion - Single-walled carbon nanotubes (SWCN) - Yarn

摘要：The ambiguous mechanism of electrocatalysts for the oxygen evolution reaction (OER) greatly hinders their industrial applications toward renewable and clean energy conversion. Here, we elaborately prepared a cobalt sulfide catalyst to perform a comprehensive study of the OER performance under neutral/alkaline conditions. The combination of synchrotron-based operando X-ray spectroscopic investigations and electron microscopy observations captured a chameleon-like structural self-optimization on the cobalt sulfide oxygen evolution electrocatalyst in both neutral and alkaline electrolytes. Driven by the actual working conditions (pH gradient, electrical potential, etc.), distinct catalytic sites could be activated dramatically. In particular, the CoOOH supported on a single-walled carbon nanotube (CoOOH-SWCNT) with residual S species was identified as the true catalyst under alkaline conditions rather than the entirely transformed CoOOH-SWCNT, while the oxygenated CoS-SWCNT (O-CoS-SWCNT) was formed as the true catalyst under neutral conditions. Undoubtedly, such a mechanism of opening different locks with different keys and its microstructural advantages together guarantee the high catalytic activity in different electrolytes. This work provides a promising catalyst as well as sheds light on the very essence of the structural self-optimization process of catalysts. It makes a significant contribution to the advancement of OER relevant studies in the future while providing new ideas for the fields of chemistry and catalysis.