Activating lattice oxygen in NiFe-based (oxy)hydroxide for water electrolysis

Zuyun He, Jun Zhang, Zhiheng Gong, Hang Lei, Deng Zhou, Nian Zhang, Wenjie Mai, Shijun Zhao () and Yan Chen ()
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Zuyun He: South China University of Technology
Jun Zhang: City University of Hong Kong
Zhiheng Gong: South China University of Technology
Hang Lei: Jinan University
Deng Zhou: Chinese Academy of Sciences
Nian Zhang: Chinese Academy of Sciences
Wenjie Mai: Jinan University
Shijun Zhao: City University of Hong Kong
Yan Chen: South China University of Technology

Nature Communications, 2022, vol. 13, issue 1, 1-12

Abstract: Abstract Transition metal oxides or (oxy)hydroxides have been intensively investigated as promising electrocatalysts for energy and environmental applications. Oxygen in the lattice was reported recently to actively participate in surface reactions. Herein, we report a sacrificial template-directed approach to synthesize Mo-doped NiFe (oxy)hydroxide with modulated oxygen activity as an enhanced electrocatalyst towards oxygen evolution reaction (OER). The obtained MoNiFe (oxy)hydroxide displays a high mass activity of 1910 A/gmetal at the overpotential of 300 mV. The combination of density functional theory calculations and advanced spectroscopy techniques suggests that the Mo dopant upshifts the O 2p band and weakens the metal-oxygen bond of NiFe (oxy)hydroxide, facilitating oxygen vacancy formation and shifting the reaction pathway for OER. Our results provide critical insights into the role of lattice oxygen in determining the activity of (oxy)hydroxides and demonstrate tuning oxygen activity as a promising approach for constructing highly active electrocatalysts.

Date: 2022
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DOI: 10.1038/s41467-022-29875-4

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