文献类型：期刊文献

英文题名：Electrochemical etching of α-cobalt hydroxide for improvement of oxygen evolution reaction

作者：Liu, Peng Fei[1];Yang, Shuang[1];Zheng, Li Rong[3];Zhang, Bo[2];Yang, Hua Gui[1]

机构：[1]E China Univ Sci & Technol, Sch Mat Sci & Engn, Key Lab Ultrafine Mat, Minist Educ, Shanghai 200237, Peoples R China;[2]E China Univ Sci & Technol, Dept Phys, Shanghai 200237, Peoples R China;[3]Chinese Acad Sci, Inst High Energy Phys, Beijing Synchrotron Radiat Facil, Beijing 100049, Peoples R China

年份：2016

卷号：4

期号：24

起止页码：9578

外文期刊名：JOURNAL OF MATERIALS CHEMISTRY A

收录：;EI(收录号：20162602530950);WOS:【SCI-EXPANDED(收录号:WOS:000378946700029)】；

基金：This work was financially supported by National Natural Science Foundation of China (21573068, 21503079), SRF for ROCS, SEM, SRFDP, Program of Shanghai Subject Chief Scientist (15XD1501300), Shanghai Municipal Natural Science Foundation (14ZR1410200), Fundamental Research Funds for the Central Universities (WD1313009) and 111 Project (B14018). The authors also thank the crew of 1W1B beamline of Beijing Synchrotron Radiation Facility for the constructive assistance in the XANES measurements and data analyses.

语种：英文

外文关键词：Dechlorination - Electrochemical etching - Oxygen - Cobalt compounds - Electrolysis

摘要：Exploring low-cost and high-efficiency electrocatalysts for oxygen evolution reaction (OER) is of paramount importance to develop large-scale alkaline water-splitting electrolyzers (AWEs). Cobalt-based materials have been widely studied because of their promising activity and abundance. However, exposing more active sites for cobalt-based electrocatalysts with enhanced activity and durability still remains as a great challenge. Herein, we demonstrate that chlorine intercalated alpha-type cobalt hydroxide can be electrochemically etched to form a highly active OER catalyst, achieving a current density of 10 mA cm(-2) at an OER overpotential of similar to 320 mV. The improvement in the OER activity can be ascribed to the dechlorination induced defective structures and in situ formation of cobalt oxyhydroxide fragments as active sites via anodic polarization. Our findings suggest a novel strategy of electrochemical etching of chlorine containing hydroxide catalysts to obtain defective oxyhydroxides for continuous electrochemical water splitting.