文献类型：期刊文献

英文题名：Highly surface electron-deficient Co9S8 nanoarrays for enhanced oxygen evolution

作者：Zhang, Haoxuan[1,2];Wang, Jingyu[1,2];Cheng, Qilin[1,2];Saha, Petr[1,2];Jiang, Hao[1,2]

机构：[1]East China Univ Sci & Technol, Shanghai Engn Res Ctr Hierarch Nanomat, Sch Mat Sci & Engn, Key Lab Ultrafine Mat,Minist Educ, Shanghai 200237, Peoples R China;[2]Tomas Bata Univ Zlin, Univ Inst, Ctr Polymer Syst, Trida T Bati 5678, Zlin 76001, Czech Republic

年份：2020

卷号：5

期号：4

起止页码：492

外文期刊名：GREEN ENERGY & ENVIRONMENT

收录：;EI(收录号：20210709907769);WOS:【SCI-EXPANDED(收录号:WOS:000614144300014)】；

基金：This work was supported by the National Natural Science Foundation of China (21838003, 21808061 and 91534122), the Social Development Program of Shanghai (17DZ1200900), the Shanghai Scientific and Technological Innovation Project (18JC1410600), and the Fundamental Research Funds for the Central Universities (222201718002).

语种：英文

外文关键词：Electron deficiency; Co9S8; Nanoarray; Electrocatalyst; Oxygen evolution reaction

摘要：Tailoring valence electron delocalization of transition metal center is of importance to achieve highly-active electrocatalysts for oxygen evolution reaction (OER). Herein, we demonstrate a "poor sulfur " route to synthesize surface electron-deficient Co9S8 nanoarrays, where the binding energy (BE) of Co metal center is considerably higher than all reported Co9S8-based electrocatalysts. The resulting Co9S8 electrocatalysts only require the overpotentials (eta) of 265 and 326 mV at 10 and 100 mA cm(-2) with a low Tafel slope of 56 mV dec(-1) and a 60 h-lasting stability in alkaline media. The OER kinetics are greatly expedited with a low reaction activation energy of 27.9 kJ mol(-1) as well as abundant OOH* key intermediates (24%), thus exhibiting excellent catalytic performances. The surface electron-deficient engineering gives an available strategy to improve the catalytic activity of other advanced non-noble electrocatalysts. (C) 2020, Institute of Process Engineering, Chinese Academy of Sciences. Publishing services by Elsevier B.V. on behalf of KeAi Communications Co., Ltd.