Synergistic coupling of IrNi/Ni(OH)2 nanosheets with polypyrrole and iron oxyhydroxide layers for efficient electrochemical overall water splitting. (2nd July 2023)

• Record Type: Journal Article
• Authors: Duan, Zhongyao; Zhang, Mei; Mao, Qiqi; Deng, Kai; Yu, Hongjie; Wang, Ziqiang; Xu, You; Wang, Liang; Wang, Hongjing
• Is Part Of: Nanotechnology. Volume 34:Number 27(2023)
• Publication Date: 2023-07-02
• Subjects: nanosheets array -- heterojunction -- interface engineering -- electrocatalyst -- water splitting; Nanotechnology -- Periodicals; Nanotechnology -- Periodicals; Nanotechnology; Publications périodiques; Nanotechnologies; Periodicals; 620.5
• DOI: 10.1088/1361-6528/acca23
• Languages: English
• ISSNs: 0957-4484

Abstract

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)2 nanosheets 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.