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Supported single-atom catalysts (SACs) possess high catalytic activity, selectivity, and atom utilizations. However, the atom coordination environments of SACs are difficult to accurately regulate due to the high complexity of coordination site and local environment of support. Herein, we develop an in-situ electrochemical cation-exchange method to fill the cation vacancies in MnO2 with Ru single atoms (SAs). This obtained catalyst exhibits high mass activity, which is ~ 44 times higher than commercial RuO2 catalyst and excellent stability, superior to the most state-of-the-art oxygen evolution reaction (OER) catalysts. The experimental and theoretical results confirm that the doped Ru can induce charge density redistribution, resulting in the optimized binding of oxygen species, and the strong covalent interaction between Ru and MnO2 for resisting oxidation and corrosion. This work will provide a new concept in the synthesis of well-defined local environments of supported SAs.


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Electrochemical disproportionation strategy to in-situ fill cation vacancies with Ru single atoms

Show Author's information Kang Xiao1Run-Tong Lin1Jin-Xin Wei1Nan Li1Hui Li2,3Tianyi Ma2,3( )Zhao-Qing Liu1( )
School of Chemistry and Chemical Engineering/Institute of Clean Energy and Materials/Guangzhou Key Laboratory for Clean Energy and Materials, Guangzhou University, Guangzhou 510006, China
Centre for Translational Atomaterials, Swinburne University of Technology, Hawthorn, VIC 3122, Australia
School of Science, RMIT University, Melbourne, VIC 3000, Australia

Abstract

Supported single-atom catalysts (SACs) possess high catalytic activity, selectivity, and atom utilizations. However, the atom coordination environments of SACs are difficult to accurately regulate due to the high complexity of coordination site and local environment of support. Herein, we develop an in-situ electrochemical cation-exchange method to fill the cation vacancies in MnO2 with Ru single atoms (SAs). This obtained catalyst exhibits high mass activity, which is ~ 44 times higher than commercial RuO2 catalyst and excellent stability, superior to the most state-of-the-art oxygen evolution reaction (OER) catalysts. The experimental and theoretical results confirm that the doped Ru can induce charge density redistribution, resulting in the optimized binding of oxygen species, and the strong covalent interaction between Ru and MnO2 for resisting oxidation and corrosion. This work will provide a new concept in the synthesis of well-defined local environments of supported SAs.

Keywords: oxygen evolution reaction, Ru, MnO2, single-atom catalysts, disproportionation

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Publication history
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Acknowledgements

Publication history

Received: 23 December 2021
Revised: 06 January 2022
Accepted: 08 January 2022
Published: 19 March 2022
Issue date: April 2022

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© Tsinghua University Press 2022

Acknowledgements

Acknowledgements

This work was supported by the National Natural Science Foundation of China (Nos. 21805051 and 21875048), Outstanding Youth Project of Guangdong Natural Science Foundation (No. 2020B1515020028), Science and Technology Research Project of Guangzhou (No. 202002010007), the Research Fund Program of Key Laboratory of Fuel Cell Technology of Guangdong Province, Australian Research Council (ARC) Future Fellowship (No. FT210100298) and Discovery Project (No. DP220100603), and CSIRO Energy Centre and Kick-Start Project. The Study Melbourne Research Partnerships program has been made possible by funding from the Victorian Government through Study Melbourne.

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