文献类型：期刊文献

英文题名：Hierarchical porous CoS2 microboxes for efficient oxygen evolution reaction

作者：Hua, Yanping[1];Jiang, Hao[1];Jiang, Haibo[1];Zhang, Haoxuan[1];Li, Chunzhong[1]

机构：[1]East China Univ Sci & Technol, Sch Mat Sci & Engn, Key Lab Ultrafine Mat, Minist Educ, Shanghai 200237, Peoples R China

年份：2018

卷号：278

起止页码：219

外文期刊名：ELECTROCHIMICA ACTA

收录：;EI(收录号：20182105216592);WOS:【SCI-EXPANDED(收录号:WOS:000433582000023)】；

基金：This work was supported by the National Natural Science Foundation of China (21522602, 51672082, and 91534202), the Social Development Program of Shanghai (17DZ1200900), the Program for Shanghai Youth Top-notch Talent, and the Fundamental Research Funds for the Central Universities (222201718002).

语种：英文

外文关键词：Oxygen evolution reaction; Cobalt sulfide; Hollow nanostructure; Electrocatalysts

摘要：The protocol to intrinsically achieve efficient oxygen evolution reaction is to maximize the catalytic activity by regulating the micro/nanostructures of electrocatalysts. Herein, we demonstrate the construction of the CoS2 nanosheets assembled three-dimensional hierarchical microboxes by a facile solvothermal process and subsequent sulfurization, where the porous building blocks are cross-linked by numerous nanoparticles. Such attractive nanostructures facilitate sufficient exposure of electrocatalytic active sites with rapid ions transfer. The as-obtained CoS2 microboxes exhibit excellent oxygen evolution reaction electrocatalytic performance with a small overpotential of only 308 mV in 1.0 mol L-1 KOH solution to achieve a current density of 10 mAcm(-2), which is much lower than the CoS2 nanoparticles (336 mV) and the CoS2 nanosheets aggregations (339mV). The Tafel slope is as low as 41.4mV dec(-1). Furthermore, they also show a negligible overpotential change during 8 h chronopotentiometry measurement. This present work highlights the importance of micro/nanostructure design for improving oxygen evolution reaction performance of water oxidation electrocatalysts. (C) 2018 Elsevier Ltd. All rights reserved.