文献类型：期刊文献

英文题名：Phosphorus-driven mesoporous Co3O4 nanosheets with tunable oxygen vacancies for the enhanced oxygen evolution reaction

作者：Xu, Qiucheng;Jiang, Hao[1];Zhang, Haoxuan;Jiang, Haibo;Li, Chunzhong[1]

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

年份：2018

卷号：259

起止页码：962

外文期刊名：ELECTROCHIMICA ACTA

收录：;EI(收录号：20174704422328);WOS:【SCI-EXPANDED(收录号:WOS:000423968600105)】；

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 vacancy; Cobalt oxide; Phosphorus doping; Oxygen evolution reaction

摘要：Uniformly and controllably introducing oxygen vacancy (Ov) into spinel electrocatalysts is still a great challenge for the oxygen evolution reaction (OER). Herein, we demonstrate the synthesis of spinel Co3O4 mesoporous nanosheets aggregation with tunable Ov by a simple phosphorus (P) doping strategy. It is found that a trade-off between Ov and electronic conductivity plays an important role in improving OER electrocatalytic activity. The optimized Co3O4-xP0.15 electrocatalyst delivers a current density of 20 mA cm(-2) in alkaline media within a small overpotential of only 338 mV, which is much lower than the corresponding Co3O4 (395 mV) and the commercial RuO2 (368 mV) catalysts. The Tafel slope is 52 mV dec(-1) and the overpotential gives negligible increase even through 8 h OER at 10 mA cm(-2). The superior OER catalytic activity is mainly attributed to the 2D mesoporous nanosheets (rich active sites) and appropriate Ov (fast electrons transfer). This work provides a simple and effective strategy to control Ov concentration in spinel electrocatalysts for enhancing water oxidation capability. (C) 2017 Elsevier Ltd. All rights reserved.