Volume 20, Issue 18 2307252
Research Article

Enabling Internal Electric Field in Heterogeneous Nanosheets to Significantly Accelerate Alkaline Hydrogen Electrocatalysis

Lei Chen

Lei Chen

School of Materials Science, Engineering, Smart Sensing Interdisciplinary Science Center, Key Laboratory of Advanced Energy Materials Chemistry (Ministry of Education), Nankai University, Tianjin, 300350 China

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Hao−Yu Wang

Hao−Yu Wang

School of Materials Science, Engineering, Smart Sensing Interdisciplinary Science Center, Key Laboratory of Advanced Energy Materials Chemistry (Ministry of Education), Nankai University, Tianjin, 300350 China

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Wen−Wen Tian

Wen−Wen Tian

School of Materials Science, Engineering, Smart Sensing Interdisciplinary Science Center, Key Laboratory of Advanced Energy Materials Chemistry (Ministry of Education), Nankai University, Tianjin, 300350 China

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Lei Wang

Lei Wang

School of Materials Science, Engineering, Smart Sensing Interdisciplinary Science Center, Key Laboratory of Advanced Energy Materials Chemistry (Ministry of Education), Nankai University, Tianjin, 300350 China

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Ming−Lei Sun

Ming−Lei Sun

School of Materials Science, Engineering, Smart Sensing Interdisciplinary Science Center, Key Laboratory of Advanced Energy Materials Chemistry (Ministry of Education), Nankai University, Tianjin, 300350 China

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Jin−Tao Ren

Corresponding Author

Jin−Tao Ren

School of Materials Science, Engineering, Smart Sensing Interdisciplinary Science Center, Key Laboratory of Advanced Energy Materials Chemistry (Ministry of Education), Nankai University, Tianjin, 300350 China

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

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Zhong−Yong Yuan

Corresponding Author

Zhong−Yong Yuan

School of Materials Science, Engineering, Smart Sensing Interdisciplinary Science Center, Key Laboratory of Advanced Energy Materials Chemistry (Ministry of Education), Nankai University, Tianjin, 300350 China

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

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First published: 06 December 2023
Citations: 10

Abstract

Efficient bifunctional hydrogen electrocatalysis, encompassing both hydrogen evolution reaction (HER) and hydrogen oxidation reaction (HOR), is of paramount significance in advancing hydrogen-based societies. While non-precious-metal-based catalysts, particularly those based on nickel (Ni), are essential for alkaline HER/HOR, their intrinsic catalytic activity often falls short of expectations. Herein, an internal electric field (IEF) strategy is introduced for the engineering of heterogeneous nickel-vanadium oxide nanosheet arrays grown on porous nickel foam (Ni-V2O3/PNF) as bifunctional electrocatalysts for hydrogen electrocatalysis. Strikingly, the Ni-V2O3/PNF delivers 10 mA cm−2 at an overpotential of 54 mV for HER and a mass-specific kinetic current of 19.3 A g−1 at an overpotential of 50 mV for HOR, placing it on par with the benchmark 20% Pt/C, while exhibiting enhanced stability in alkaline electrolytes. Density functional theory calculations, in conjunction with experimental characterizations, unveil that the interface IEF effect fosters asymmetrical charge distributions, which results in more thermoneutral hydrogen adsorption Gibbs free energy on the electron-deficient Ni side, thus elevating the overall efficiency of both HER and HOR. The discoveries reported herein guidance are provided for further understanding and designing efficient non-precious-metal-based electrocatalysts through the IEF strategy.

Conflict of Interest

The authors declare no conflict of interest.

Data Availability Statement

The data that support the findings of this study are available from the corresponding author upon reasonable request.

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