文献类型：期刊文献

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

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

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

机构：[1]Key Laboratory for Ultrafine Materials of Ministry of Education, School of Materials Science and Engineering, East China University of Science and Technology

年份：2019

卷号：28

期号：10

起止页码：1

中文期刊名：Journal of Energy Chemistry

外文期刊名：能源化学（英文版）

收录：CSTPCD;;Scopus;CSCD:【CSCD2019_2020】；

基金：supported by the National Natural Science Foundation of China (21838003, 91534122);the Social Development Program of Shanghai (17DZ1200900);the Shanghai Scientific and Technological Innovation Project (18JC1410600);the Program for Shanghai Youth Top-notch Talent;the Fundamental Research Funds for the Central Universities (222201718002)

语种：英文

中文关键词：Interface;strengthening;Cobalt;phosphide;Electrocatalyst;Water;splitting

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 twodimensional (2D) nanosheets with thickness of^55 nm 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 256 mV 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 10 mA cm^-2 at a low voltage of 1.57 V 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.
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 Co P nanosheet array with Co2 P nanoparticles as such an electrocatalyst through a facile hydrothermal reaction and the subsequent phosphorization process. The twodimensional（2 D） nanosheets with thickness of ～55 nm expose a great number of active sites. The surface chemical state indicates that the strongly coupled Co P/Co2 P electrocatalysts can adsorb or generate more targeted intermediates（e.g. OH- or OOH*） for both HER/OER. As a result, the Co P/Co2 P electrocatalysts exhibit small overpotentials of 68 and 256 mV to drive 10 m A cm-2 for HER and OER, respectively, outperforming most of the recently reported Co-based electrocatalysts. Furthermore, an alkaline electrolyzer assembled by using Co P/Co2 P as both cathode and anode can achieve a current density of 10 mA cm-2 at a low voltage of 1.57 V 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.