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Research Article

Enriched electrophilic oxygen species facilitate acidic oxygen evolution on Ru-Mo binary oxide catalysts

Yaya Wang1,2,§, Yunzhou Wen2,§, Yumeng Cheng2, Xinhong Chen2, Mengjiao Zhuansun3, Tongbao Wang3, Jun Li4, Debora Meira5,6, Huarui Sun2, Jun Wei1,7, Jia Zhou2( ), Yuhang Wang3( ), Sisi He1,2( )
Shenzhen Key Laboratory of Flexible Printed Electronics Technology, Harbin Institute of Technology (Shenzhen), University Town, Shenzhen 518055, China
School of Science, Harbin Institute of Technology (Shenzhen), University Town, Shenzhen 518055, China
Institute of Functional Nano & Soft Materials (FUNSOM), Jiangsu Key Laboratory of Advanced Negative Carbon Technologies, Soochow University, Suzhou 215123, China
Frontiers Science Center for Transformative Molecules, Shanghai Jiao Tong University, Shanghai 200240, China
Science Division, Canadian Light Source, Saskatoon, SK, S7N 2V3, Canada
Photon Science Division, Argonne National Laboratory, Lemont, IL, 60439, USA
School of Materials Science and Engineering, Harbin Institute of Technology, (Shenzhen), University Town, Shenzhen 518055, China

§ Yaya Wang and Yunzhou Wen contributed equally to this work.

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Graphical Abstract

In this work, a Ru-Mo binary oxide catalyst for active and stable water oxidation in acidic electrolytes is developed. The incorporation of Mo induces the formation of electrophilic oxygen intermediates and facilitates O–O coupling during oxygen evolution reaction (OER).

Abstract

The polymer electrolyte membrane (PEM) electrolyzers are burdened with costly iridium (Ir)-based catalysts and high operation overpotentials for the oxygen evolution reaction (OER). The development of earth-abundant, highly active, and durable electrocatalysts to replace Ir is a critical step in reducing the cost of green hydrogen production. Here we develop a Ru5Mo4Ox binary oxide catalyst that exhibits high activity and stability in acidic OER. The electron-withdrawing property of Mo enriches the electrophilic surface oxygen species, which promotes acidic OER to proceed via the adsorbate evolution pathway. As a result, we achieve a 189 mV overpotential at 10 mA·cm−2 and a Tafel slope of 48.8 mV·dec−1. Our catalyst demonstrates a substantial 18-fold increase in intrinsic activity, as evaluated by turnover frequency, compared to commercially available RuO2 and IrO2 catalysts. Moreover, we report a stable OER operation at 10 mA·cm−2 for 100 h with a low degradation rate of 2.05 mV·h−1.

Keywords

electrocatalysisoxygen evolution reaction (OER)molybdenumelectrophilic oxygenruthenium (Ru)-based oxide

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Nano Research
Volume 17 Issue 3,
March 2024
Pages 1165-1172
DOI: 10.1007/s12274-023-5956-8
Cite this article:
Wang Y, Wen Y, Cheng Y, et al. Enriched electrophilic oxygen species facilitate acidic oxygen evolution on Ru-Mo binary oxide catalysts. Nano Research, 2024, 17(3): 1165-1172. https://doi.org/10.1007/s12274-023-5956-8
Topics:
Oxygen evolution reaction

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Received: 01 May 2023
Revised: 19 June 2023
Accepted: 22 June 2023
Published: 29 July 2023
© Tsinghua University Press 2023
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