文献类型：期刊文献

英文题名：Interface-strengthened CoP nanosheet array with Co2P nanoparticles as efficient electrocatalysts for overall water splitting

作者：Hua, Yanping[1];Xu, Qiucheng[1];Hu, Yanjie[1];Jiang, Hao[1];Li, Chunzhong[1]

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

年份：2019

卷号：37

起止页码：1

外文期刊名：JOURNAL OF ENERGY CHEMISTRY

收录：;EI(收录号：20184906177739);WOS:【SCI-EXPANDED(收录号:WOS:000477704000001)】；

基金：This work was supported by the National Natural Science Foundation of China (21838003, 91534122), the Social Development Program of Shanghai (17DZ120 090 0), the Shanghai Scientific and Technological Innovation Project (18JC1410600), 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：Interface strengthening; Cobalt phosphide; Electrocatalyst; Water splitting

摘要：Highly active and durable bifunctional electrocatalysts for hydrogen evolution reaction (HER) and oxygen evolution reaction (OER) play a pivotal role in overall water splitting. Herein, we demonstrate the construction of interface-strengthened CoP nanosheet array with Co2P nanoparticles as such an electrocatalyst through a facile hydrothermal reaction and the subsequent phosphorization process. The two-dimensional (2D) nanosheets with thickness of similar to 55nm expose a great number of active sites. The surface chemical state indicates that the strongly coupled CoP/Co2P electrocatalysts can adsorb or generate more targeted intermediates (e.g. OH- or OOH*) for both HER/OER. As a result, the CoP/Co2P electrocatalysts exhibit small overpotentials of 68 and 256mV to drive 10 mA cm(-2) for HER and OER, respectively, outperforming most of the recently reported Co-based electrocatalysts. Furthermore, an alkaline electrolyzer assembled by using CoP/Co2P as both cathode and anode can achieve a current density of 10mA cm(-2) at a low voltage of 1.57V and work continuously for over 58 h. This work provides a feasible structural design for transition metal phosphides electrocatalysts with efficient and stable overall water splitting. (C) 2018 Science Press and Dalian Institute of Chemical Physics, Chinese Academy of Sciences. Published by Elsevier B.V. and Science Press. All rights reserved.