文献类型：期刊文献

英文题名：Tailorable surface sulfur chemistry of mesoporous Ni3S2 particles for efficient oxygen evolution

作者：Zhang, Haoxuan[1];Jiang, Hao[1];Hu, Yanjie[1];Li, Yuhang[1];Xu, Qiucheng[1];Saha, Petr[2];Li, Chunzhong[1]

机构：[1]East China Univ Sci & Technol, Sch Mat Sci & Engn, Shanghai Engn Res Ctr Hierarch Nanomat, Key Lab Ultrafine Mat,Minist Educ, Shanghai 200237, Peoples R China;[2]Tomas Bata Univ Zlin, Univ Inst, Ctr Polymer Syst, Trida T Bati 5678, Zlin 76001, Czech Republic

年份：2019

卷号：7

期号：13

起止页码：7548

外文期刊名：JOURNAL OF MATERIALS CHEMISTRY A

收录：;EI(收录号：20191306705423);WOS:【SCI-EXPANDED(收录号:WOS:000463819400024)】；

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 and 18DZ2252400), 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：Binding energy - Nickel - Oxygen - Reaction kinetics - Sulfur compounds - Alkalinity - Catalyst activity - Nickel compounds

摘要：Boosting the intrinsic activity of electrocatalysts is pivotal in enhancing the oxygen evolution reaction (OER) at the source. Herein, we synthesize a mesoporous Ni3S2 particle electrocatalyst on Ni foam that has appropriate surface sulfur chemistry and demonstrates excellent catalytic activity as well as rapid reaction kinetics. The optimized Ni3S2 electrocatalyst shows ultralow overpotentials of 213 and 283 mV at 10 and 100 mA cm(-2), respectively, with a very low Tafel slope of 45 mV dec(-1) in alkaline media. The ECSA normalized current density is 1.1 mA cm(-2) at an overpotential of 270 mV, nearly three times higher than that of pristine Ni3S2 (0.4 mA cm(-2)). It has been observed that the sulfur-engineered Ni3S2 electrocatalyst can promote more Ni3+ generation with a significant shift of the Ni center binding energy compared with pristine Ni3S2 during the OER. The findings propose a facile tactic to improve the intrinsic OER activity for water splitting by optimizing the surface sulfur chemistry of metal sulfide-based electrocatalysts.