Defect-Rich Heterogeneous MoS2/NiS2 Nanosheets Electrocatalysts for Efficient Overall Water Splitting

Jinghuang Lin; Pengcheng Wang; Haohan Wang; Chun Li; Xiaoqing Si; Junlei Qi; Jian Cao; Zhengxiang Zhong; Weidong Fei; Jicai Feng

doi:10.1002/advs.201900246

Defect-Rich Heterogeneous MoS₂/NiS₂ Nanosheets Electrocatalysts for Efficient Overall Water Splitting

Adv Sci (Weinh). 2019 May 20;6(14):1900246. doi: 10.1002/advs.201900246. eCollection 2019 Jul 17.

Authors

Affiliations

¹ State Key Laboratory of Advanced Welding and Joining Harbin Institute of Technology Harbin 150001 China.
² School of Materials Science and Engineering Harbin Institute of Technology Harbin 150001 China.
³ MIIT Key Laboratory of Critical Materials Technology for New Energy Conversion and Storage State Key Laboratory of Urban Water Resource and Environment School of Chemistry and Chemical Engineering Harbin Institute of Technology Harbin 150001 China.

Abstract

Designing and constructing bifunctional electrocatalysts is vital for water splitting. Particularly, the rational interface engineering can effectively modify the active sites and promote the electronic transfer, leading to the improved splitting efficiency. Herein, free-standing and defect-rich heterogeneous MoS₂/NiS₂ nanosheets for overall water splitting are designed. The abundant heterogeneous interfaces in MoS₂/NiS₂ can not only provide rich electroactive sites but also facilitate the electron transfer, which further cooperate synergistically toward electrocatalytic reactions. Consequently, the optimal MoS₂/NiS₂ nanosheets show the enhanced electrocatalytic performances as bifunctional electrocatalysts for overall water splitting. This study may open up a new route for rationally constructing heterogeneous interfaces to maximize their electrochemical performances, which may help to accelerate the development of nonprecious electrocatalysts for overall water splitting.

Keywords: defects; free‐standing; heterointerfaces; metal sulfides; overall water splitting.