Modulating Electronic Structure of Iridium Single‐Atom Anchored on 3D Fe‐Doped β‐Ni(OH)2 Catalyst with Nanopyramid Array Structure for Enhanced Oxygen Evolution Reaction

Author:

Kang Hongjun12,Qiao Xianshu1,Jia Xin1,Wang Xinzhi2,Hou Guangyao1,Wu Xiaohong2ORCID,Qin Wei1

Affiliation:

1. School of Materials Science and Engineering Harbin Institute of Technology Harbin Heilongjiang 150001 P. R. China

2. School of Chemistry and Chemical Engineering Harbin Institute of Technology Harbin Heilongjiang 150001 P. R. China

Abstract

AbstractDeveloping high‐performance electrocatalysts for oxygen evolution reaction (OER) is crucial in the pursuit of clean and sustainable hydrogen energy, yet still challenging. Herein, a spontaneous redox strategy is reported to achieve iridium single‐atoms anchored on hierarchical nanosheet‐based porous Fe doped β‐Ni(OH)2 pyramid array electrodes (SAs Ir/Fe‐β‐Ni(OH)2), which exhibits high OER performance with a low overpotential of 175 mV at 10 mA cm−2 and a remarkable OER current density in alkaline electrolyte, surpassing Fe‐β‐Ni(OH)2/NF and IrO2 by 31 and 38 times at 1.43 V versus RHE, respectively. OER catalytic mechanism demonstrates that the conversion of *OH→*O and the active lattice O content can be significantly improved due to the modulation effect of the Ir single atoms on the local electronic structure and the redox behavior of FeNi (oxy) hydroxide true active species. This work provides a promising insight into understanding the OER enhancement mechanism for Ir single‐atoms modified FeNi‐hydroxide systems.

Funder

National Natural Science Foundation of China

National Basic Research Program of China

Natural Science Foundation of Heilongjiang Province

Publisher

Wiley

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