Synergistic coupling of IrNi/Ni(OH)2nanosheets with polypyrrole and iron oxyhydroxide layers for efficient electrochemical overall water splitting

Zhongyao Duan; Mei Zhang; Qiqi Mao; Kai Deng; Hongjie Yu; Ziqiang Wang; You Xu; Liang Wang; Hongjing Wang

doi:10.1088/1361-6528/acca23

Synergistic coupling of IrNi/Ni(OH)₂nanosheets with polypyrrole and iron oxyhydroxide layers for efficient electrochemical overall water splitting

Nanotechnology. 2023 Apr 19;34(27). doi: 10.1088/1361-6528/acca23.

Authors

Zhongyao Duan¹, Mei Zhang¹, Qiqi Mao¹, Kai Deng¹, Hongjie Yu¹, Ziqiang Wang¹, You Xu¹, Liang Wang¹, Hongjing Wang¹

Affiliation

¹ State Key Laboratory Breeding Base of Green-Chemical Synthesis Technology, College of Chemical Engineering, Zhejiang University of Technology, Hangzhou, Zhejiang 310014, People's Republic of China.

PMID: 37015205
DOI: 10.1088/1361-6528/acca23

Abstract

The design of electrocatalysts with excellent activity and stability for overall water splitting is highly desirable, and remains a challenge. Constructing heterojunctions onto the same substrate is beneficial for the integration of a water-splitting reaction. Herein, self-supported IrNi/Ni(OH)₂@PPy and IrNi/Ni(OH)₂@FeOOH are fabricated by coupling polypyrrole (PPy) and iron oxyhydroxide (FeOOH) on IrNi/Ni(OH)₂nanosheets array, respectively. Benefiting from the nanosheet structure, composition, and heterogeneous interface, the as-constructed IrNi/Ni(OH)₂@PPy and IrNi/Ni(OH)₂@FeOOH catalysts can efficiently drive the hydrogen evolution reaction and oxygen evolution reaction, respectively. Moreover, the electrolyzer consisting of IrNi/Ni(OH)₂@PPy and IrNi/Ni(OH)₂@FeOOH for water splitting requires only a low cell voltage of 1.49 V to deliver 10 mA cm^-2. This study provides a useful strategy for constructing efficient electrocatalysts by synergistic composition modulation and interface engineering.

Keywords: electrocatalyst; heterojunction; interface engineering; nanosheets array; water splitting.