文献类型：期刊文献

英文题名：Heterogeneous interface engineered atomic configuration on ultrathin Ni(OH)2/Ni3S2 nanoforests for efficient water splitting

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

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

年份：2019

卷号：242

起止页码：60

外文期刊名：APPLIED CATALYSIS B-ENVIRONMENTAL

收录：;WOS:【SCI-EXPANDED(收录号:WOS:000450135000007)】；

基金：This work was supported by the National Natural Science Foundation of China (91534202 and 91534122), the Social Development Program of Shanghai (17DZ1200900), the Shanghai Scientific and Technological Innovation Project (18JC1410600), the National Program for Support of Top-Notch Young Professionals, and the Fundamental Research Funds for the Central Universities (222201718002).

语种：英文

外文关键词：Heterogeneous interface; Ni(OH)(2)/Ni3S2 nanoforest; Electrocatalyst; Water splitting

摘要：The sluggish water dissociation kinetics of low-cost Ni3S2 electrocatalysts severely hinders the hydrogen evolution reaction (HER), resulting in unsatisfied overall water splitting in alkaline media. Herein, we demonstrate the self-assembly of a new nanoforest electrocatalyst by ultrathin Ni(OH)(2)/Ni3S2 heterogeneous nanosheets (similar to 1.8 nm) using a high-temperature and large-potential electrodeposition technique. The surface atomic configuration of Ni3S2 is well-modulated by hetero-interface engineering with the Ni(OH)(2) cocatalyst, effectively accelerating the Volmer step and OH- adsorption during the HER without sacrificing the oxygen evolution reaction (OER). The resultant electrocatalysts exhibit superior and stable electrocatalytic activity toward the HER and OER in 1 M KOH with small overpotentials of 50 mV and 210 mV at 10 mA cm(-2), respectively. Using the Ni(OH)(2)/Ni3S2 nanoforest as dual-functional electrocatalysts, an alkaline electrolyzer can render 100 mA cm(-2) at a very low cell voltage of 1.64 V while keep stable for 120 hat 1.55 V, which outperforms the best report for Ni-based electrocatalysts. This finding gives a new insight into the modulating surface atomic configuration for achieving highly active electrocatalysts for water splitting.