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Research Article

Ir single atoms modified Ni(OH)2 nanosheets on hierarchical porous nickel foam for efficient oxygen evolution

Chunxu Jia1,2, Hao Qin1,2, Chao Zhen1( ), Huaze Zhu1,2, Yongqiang Yang1, Ali Han1, Lianzhou Wang3, Gang Liu1,2( ), Hui-Ming Cheng1,4
Shenyang National Laboratory for Materials Science, Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110016, China
School of Materials Science and Engineering, University of Science and Technology of China, Shenyang 110016, China
Nanomaterials Centre, School of Chemical Engineering and Australian Institute for Bioengineering and Nanotechnology, The University of Queensland, QLD 4072, Australia
Faculty of Materials Science and Engineering/Institute of Technology for Carbon Neutrality, Shenzhen Institute of Advanced Technology, Chinese Academy of Sciences, Shenzhen 518055, China
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Graphical Abstract

A feasible one-step electrodeposition method was developed to fabricate Ir single atoms modified Ni(OH)2 nanosheets on a hierarchical porous nickel substrate as oxygen evolution reaction (OER) electrode for efficient electrochemical water splitting.

Abstract

Developing highly efficient oxygen evolution reaction (OER) catalysts for electrolytic water splitting is urgently desirable but remains a challenge due to sluggish kinetic process of water oxidation. Herein, we report a one-step electrodeposition strategy to prepare Ni(OH)2 modified with Ir single-atom catalysts (SACs) (Ir SACs/Ni(OH)2) on an electrically conductive substrate of three dimensional (3D) hierarchical porous nickel foam (HP-NF) as efficient OER electrocatalyst. The HP-NF with abundant open pores can not only enable the full exposure of catalytically active sites but also facilitate the diffusion of electrolyte and release of gaseous oxygen produced. The optimal Ir SACs/Ni(OH)2@HP-NF exhibits a remarkable catalytic performance and outstanding stability for the OER activity in 1.0 M KOH alkaline media, delivering a low overpotential of ~ 223 mV at a current density of 10 mA·cm−2 and a low Tafel plot of 58 mV·dec−1. Various characterizations together with control electrochemical experiments demonstrated that the superior activity and robust stability of Ir SACs/Ni(OH)2@HP-NF for OER are originated from the highly distributed and exposed Ir SACs and 3D interconnected pores of HP-NF with high electric conductivity.

Keywords

electrocatalysissingle-atom catalystshierarchical porous nickeloxygen evolution reaction

Electronic Supplementary Material

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Nano Research
Volume 15 Issue 12,
December 2022
Pages 10014-10020
DOI: 10.1007/s12274-022-4501-5
Cite this article:
Jia C, Qin H, Zhen C, et al. Ir single atoms modified Ni(OH)2 nanosheets on hierarchical porous nickel foam for efficient oxygen evolution. Nano Research, 2022, 15(12): 10014-10020. https://doi.org/10.1007/s12274-022-4501-5
Topics:
Electrocatalysis
Part of a topical collection:
NR45 Awards in Nanocatalysis, 2022

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Received: 13 April 2022
Revised: 01 May 2022
Accepted: 03 May 2022
Published: 08 July 2022
© Tsinghua University Press 2022
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