Volume 18, Issue 3 2106187
Research Article

Quench-Induced Surface Engineering Boosts Alkaline Freshwater and Seawater Oxygen Evolution Reaction of Porous NiCo2O4 Nanowires

Jin Yang

Jin Yang

College of Chemistry and Materials Engineering, Zhejiang A&F University, Hangzhou, 311300 P. R. China

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Yanan Wang

Yanan Wang

Songshan Lake Materials Laboratory, Dongguan, Guangdong, 523808 P. R. China

Beijing National Laboratory for Condensed Matter Physics and Institute of Physics, Chinese Academy of Sciences, Beijing, 100190 P. R. China

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Jie Yang

Jie Yang

Department of Electrical and Computer Engineering, National University of Singapore, Singapore, 117583 Singapore

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Yajun Pang

Corresponding Author

Yajun Pang

College of Chemistry and Materials Engineering, Zhejiang A&F University, Hangzhou, 311300 P. R. China

E-mail: [email protected]; [email protected]; [email protected]; [email protected]

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Xinqiang Zhu

Xinqiang Zhu

College of Chemistry and Materials Engineering, Zhejiang A&F University, Hangzhou, 311300 P. R. China

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Yinzhuo Lu

Yinzhuo Lu

College of Chemistry and Materials Engineering, Zhejiang A&F University, Hangzhou, 311300 P. R. China

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Yitian Wu

Yitian Wu

College of Chemistry and Materials Engineering, Zhejiang A&F University, Hangzhou, 311300 P. R. China

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Jiajie Wang

Jiajie Wang

College of Chemistry and Materials Engineering, Zhejiang A&F University, Hangzhou, 311300 P. R. China

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Hao Chen

Corresponding Author

Hao Chen

College of Chemistry and Materials Engineering, Zhejiang A&F University, Hangzhou, 311300 P. R. China

E-mail: [email protected]; [email protected]; [email protected]; [email protected]

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Zongkui Kou

Zongkui Kou

State Key Laboratory of Advanced Technology for Materials Synthesis and Processing, Wuhan University of Technology, Wuhan, 430070 P. R. China

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Zhehong Shen

Zhehong Shen

College of Chemistry and Materials Engineering, Zhejiang A&F University, Hangzhou, 311300 P. R. China

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Zhenghui Pan

Corresponding Author

Zhenghui Pan

Department of Materials Science and Engineering, National University of Singapore, Singapore, 117574 Singapore

E-mail: [email protected]; [email protected]; [email protected]; [email protected]

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John Wang

Corresponding Author

John Wang

College of Chemistry and Materials Engineering, Zhejiang A&F University, Hangzhou, 311300 P. R. China

Department of Materials Science and Engineering, National University of Singapore, Singapore, 117574 Singapore

E-mail: [email protected]; [email protected]; [email protected]; [email protected]

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First published: 04 December 2021
Citations: 35

Abstract

The electrochemical oxygen evolution reaction (OER) by efficient catalysts is a crucial step for the conversion of renewable energy into hydrogen fuel, in which surface/near-surface engineering has been recognized as an effective strategy for enhancing the intrinsic activities of the OER electrocatalysts. Herein, a facile quenching approach is demonstrated that can simultaneously enable the required surface metal doping and vacancy generation in reconfiguring the desired surface of the NiCo2O4 catalyst, giving rise to greatly enhanced OER activities in both alkaline freshwater and seawater electrolytes. As a result, the quenched-engineered NiCo2O4 nanowire electrode achieves a current density of 10 mA cm−2 at a low overpotential of 258 mV in 1 m KOH electrolyte, showing the remarkable catalytic performance towards OER. More impressively, the same electrode also displays extraordinary activity in an alkaline seawater environment and only needs 293 mV to reach 10 mA cm−2. Density functional theory (DFT) calculations reveal the strong electronic synergies among the metal cations in the quench-derived catalyst, where the metal doping regulates the electronic structure, thereby yielding near-optimal adsorption energies for OER intermediates and giving rise to superior activity. This study provides a new quenching method to obtain high-performance transition metal oxide catalysts for freshwater/seawater electrocatalysis.

Conflict of Interest

The authors declare no conflict of interest.

Data Availability Statement

Research data are not shared.

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