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In-situ transformed Mott-Schottky heterointerface in silver/manganese oxide nanorods boosting oxygen reduction, oxygen evolution, and hydrogen evolution reactions

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Abstract

The development of non-platinum group metal (non-PGM) and efficient multifunctional electrocatalysts for oxygen reduction reaction (ORR), oxygen evolution reaction (OER), and hydrogen evolution reaction (HER) with high activity and stability remains a great challenge. Herein, by in-situ transforming silver manganese composite oxide heterointerface into boosted Mott-Schottky heterointerface through a facile carbon reduction strategy, a nanorod-like silver/manganese oxide with superior multifunctional catalytic activities for ORR, OER and HER and stability was obtained. The nanorod-like silver/manganese oxide with Mott-Schottky heterointerface (designated as Ag/Mn3O4) exhibits an ORR half-wave potential of 0.831 V (vs. RHE) in 0.1 M KOH, an OER overpotential of 338 mV and a HER overpotential of 177 mV at the current density of 10 mA·cm−2 in 1 M KOH, contributing to its noble-metal benchmarks comparable performance in aqueous aluminum-air (Al-air) battery and laboratorial overall water splitting electrolytic cell. Moreover, in-situ electrochemical Raman and synchrotron radiation spectroscopic measurements were conducted to further illustrate the catalytic mechanism of Ag/Mn3O4 Mott-Schottky heterointerface towards various electrocatalytic reactions. At the heterointerface, the Ag phase serves as the electron donor and the active phase for ORR and HER, while the Mn3O4 phase serves as the electron acceptor and the active phase for OER, respectively. This work deepens the understanding of the Mott-Schottky effect on electrocatalysis and fills in the gap in fundamental physical principles that are behind measured electrocatalytic activity, which offers substantial implications for the rational design of cost-effective multifunctional electrocatalysts with Mott-Schottky effect.

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Acknowledgements

This work is financially supported by the National Natural Science Foundation of China (No. 52274302) and Natural Science Foundation of Shanghai (Nos. 21ZR1429400 and 22ZR1429700).

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Authors and Affiliations

  1. Shanghai Key Laboratory of Advanced High-temperature Materials and Precision Forming, School of Materials Science and Engineering, Shanghai Jiao Tong University, Shanghai, 200240, China

    Ruiqi Cheng, Tianshuo Zhao, Jiao Zhang & Chaopeng Fu

  2. Christopher Ingold Laboratory, Department of Chemistry, University College London, London, WC1H 0AJ, UK

    Kaiqi Li

  3. Department of Chemistry, Physical & Theoretical Chemistry Laboratory, University of Oxford, South Parks Road, Oxford, OX1 3QZ, UK

    Huanxin Li

  4. Center of Hydrogen Science, School of Materials Science and Engineering, Shanghai Jiao Tong University, Shanghai, 200240, China

    Fengzhan Sun & Xiaoqian He

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In-situ transformed Mott-Schottky heterointerface in silver/manganese oxide nanorods boosting oxygen reduction, oxygen evolution, and hydrogen evolution reactions

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Cheng, R., Li, K., Li, H. et al. In-situ transformed Mott-Schottky heterointerface in silver/manganese oxide nanorods boosting oxygen reduction, oxygen evolution, and hydrogen evolution reactions. Nano Res. 17, 3622–3632 (2024). https://doi.org/10.1007/s12274-023-6240-7

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