Volume 21, Issue 7 2406209
Research Article

Electronic Structure Engineering of RuNi Alloys Decrypts Hydrogen and Hydroxyl Active Site Separation and Enhancement for Efficient Alkaline Hydrogen Evolution

Wei Lian

Wei Lian

Key Laboratory of Green Utilization of Critical Non-Metallic Mineral Resources of Ministry of Education, School of Resources and Environmental Engineering, Wuhan University of Technology, Wuhan, 430073 China

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Feng Chen

Feng Chen

Key Laboratory of Green Utilization of Critical Non-Metallic Mineral Resources of Ministry of Education, School of Resources and Environmental Engineering, Wuhan University of Technology, Wuhan, 430073 China

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Jie Wu

Jie Wu

Key Laboratory of Green Utilization of Critical Non-Metallic Mineral Resources of Ministry of Education, School of Resources and Environmental Engineering, Wuhan University of Technology, Wuhan, 430073 China

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Haoyang Mo

Haoyang Mo

Key Laboratory of Green Utilization of Critical Non-Metallic Mineral Resources of Ministry of Education, School of Resources and Environmental Engineering, Wuhan University of Technology, Wuhan, 430073 China

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Qiuyu Zhu

Qiuyu Zhu

Key Laboratory of Green Utilization of Critical Non-Metallic Mineral Resources of Ministry of Education, School of Resources and Environmental Engineering, Wuhan University of Technology, Wuhan, 430073 China

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Xian Zhang

Corresponding Author

Xian Zhang

Ministry of Education Key Laboratory for the Green Preparation and Application of Functional Materials, Hubei University, Wuhan, 430062 China

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

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Shaoxian Song

Shaoxian Song

Key Laboratory of Green Utilization of Critical Non-Metallic Mineral Resources of Ministry of Education, School of Resources and Environmental Engineering, Wuhan University of Technology, Wuhan, 430073 China

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Feifei Jia

Corresponding Author

Feifei Jia

Key Laboratory of Green Utilization of Critical Non-Metallic Mineral Resources of Ministry of Education, School of Resources and Environmental Engineering, Wuhan University of Technology, Wuhan, 430073 China

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

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First published: 03 November 2024
Citations: 3

Abstract

Rational design of the active sites of hydrolysis dissociation intermediates to weaken their active site competition and toxicity is a key challenge to achieve efficient and stable hydrogen evolution reaction (HER) in ruthenium-containing alloys. Density Functional Theory (DFT) simulations reveal that the transfer of the d-band electrons from Ru to Ni in RuNi alloys results in a Gibbs free energy of −0.12 eV for the Ru0.250Ni Fcc-site H*. In addition, the high spin state of the electrons outside the Ru nucleus strengthens the adsorption of OH* on the Ru─Ni bond, which weakens the active-site competition and toxicity successfully. This theoretical prediction is confirmed by electrodeposition of prepared aRuxNi, and the RuNi alloys obtained by Ru atom doping have excellent HER properties. aRu0.250Ni has overpotentials of 38 and 162.4 mV at −10 and −100 mA cm−2, respectively, and can be stably operated at −100 mA cm−2 Dual-electrode system aRu0.250Ni//bRu0Ni demonstrates an ultra-low battery voltage (1.86 V @500 mA cm−2) and excellent stability (24 h@300 mA cm−2). This holistic work resolves the mechanism of active site separation and strengthening in RuNi alloys, and provides a new design idea for the preparation of highly efficient alkaline HER electrodes.

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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