Atomic-level insight into super-efficient electrocatalytic oxygen evolution on iron and vanadium co-doped nickel (oxy)hydroxide

Jian Jiang, Fanfei Sun, Si Zhou, Wei Hu, Hao Zhang, Jinchao Dong, Zheng Jiang, Jijun Zhao, Jianfeng Li, Wensheng Yan () and Mei Wang ()
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Jian Jiang: Dalian University of Technology
Fanfei Sun: Chinese Academy of Sciences
Si Zhou: Dalian University of Technology
Wei Hu: University of Science and Technology of China
Hao Zhang: Chinese Academy of Sciences
Jinchao Dong: Xiamen University
Zheng Jiang: Chinese Academy of Sciences
Jijun Zhao: Dalian University of Technology
Jianfeng Li: Xiamen University
Wensheng Yan: University of Science and Technology of China
Mei Wang: Dalian University of Technology

Nature Communications, 2018, vol. 9, issue 1, 1-12

Abstract: Abstract It is of great importance to understand the origin of high oxygen-evolving activity of state-of-the-art multimetal oxides/(oxy)hydroxides at atomic level. Herein we report an evident improvement of oxygen evolution reaction activity via incorporating iron and vanadium into nickel hydroxide lattices. X-ray photoelectron/absorption spectroscopies reveal the synergistic interaction between iron/vanadium dopants and nickel in the host matrix, which subtly modulates local coordination environments and electronic structures of the iron/vanadium/nickel cations. Further, in-situ X-ray absorption spectroscopic analyses manifest contraction of metal–oxygen bond lengths in the activated catalyst, with a short vanadium–oxygen bond distance. Density functional theory calculations indicate that the vanadium site of the iron/vanadium co-doped nickel (oxy)hydroxide gives near-optimal binding energies of oxygen evolution reaction intermediates and has lower overpotential compared with nickel and iron sites. These findings suggest that the doped vanadium with distorted geometric and disturbed electronic structures makes crucial contribution to high activity of the trimetallic catalyst.

Date: 2018
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DOI: 10.1038/s41467-018-05341-y

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