文献类型：期刊文献

英文题名：Continuous oxygen vacancy engineering of the Co3O4 layer for an enhanced alkaline electrocatalytic hydrogen evolution reaction

作者：Zhang, Haoxuan[1];Zhang, Jiahao[1];Li, Yuhang[1];Jiang, Haibo[1];Jiang, Hao[1];Li, Chunzhong[1]

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

年份：2019

卷号：7

期号：22

起止页码：13506

外文期刊名：JOURNAL OF MATERIALS CHEMISTRY A

收录：;EI(收录号：20192407024219);WOS:【SCI-EXPANDED(收录号:WOS:000470928800005)】；

基金：This work was supported by the National Natural Science Foundation of China (21838003, 21808061 and 91534122), the Social Development Program of Shanghai (17DZ1200900), the Shanghai Scientific and Technological Innovation Project (18JC1410600), the Program for Professor of Special Appointment (Eastern Scholar) at Shanghai Institutions of Higher Learning, and the Fundamental Research Funds for the Central Universities (222201718002).

语种：英文

外文关键词：Reaction intermediates - Reaction kinetics - Hydrogen - Oxygen vacancies - Synthesis (chemical) - Cobalt compounds - Electrolysis - Electrocatalysis

摘要：Precisely tailoring the oxygen vacancies (Ov) of Co oxide based electrocatalysts could be highly essential for boosting hydrogen evolution reaction (HER) performance in alkaline media. Here, a rapid synthesis of an Ov-engineered Co3O4 layer on Ni foam has been demonstrated through a solid-phase melting strategy, where the Ov content in the Co3O4 layer can be adjusted from 52% to 74% simply by changing melting temperature. After HER testing, this content is further adjusted to 22-45% with the same trend. Remarkably, the Co3O4 layer with a medium Ov content (32%) gives the highest mass activity of -2.12 A g(-1) at an overpotential of 200 mV for the alkaline electrocatalytic HER. Moreover, it only requires an ultrasmall overpotential of 203 mV to achieve -100 mA cm(-2), outperforming all reported Co3O4 electrocatalysts so far. The medium Ov content in the Co3O4 electrocatalyst could enhance reaction kinetics by optimizing catalytic intermediate adsorption during the alkaline HER. This feasible tactic to precisely control Ov may provide an avenue for exploring other advanced electrocatalysts.