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Nano Research 2024, 17(6): 5073-5079 https://doi.org/10.1007/s12274-024-6524-6
Research Article | Issue | Published: 14 March 2024

Constructing high coordination number of Ir–O–Ru bonds in IrRuOx nanomeshes for highly stable acidic oxygen evolution reaction

Show Author's Information Ge Yu1,§,  Ruilong Li1,§,  Yida Zhang2,  Xingen Lin1,  Gongming Wang1( ),  Xun Hong1( )
Center of Advanced Nanocatalysis (CAN), Department of Applied Chemistry, University of Science and Technology of China, Hefei 230026, China
National Synchrotron Radiation Laboratory (NSRL), University of Science and Technology of China, Hefei 230029, China

§ Ge Yu and Ruilong Li contributed equally to this work.

Keywords:
oxygen evolution reaction, mass transport, proton exchange membrane device, IrRuOx, Ir–O–Ru bonds, two-dimensional (2D) nanomesh
Topics:
Oxygen evolution reaction
Cite this article:
Yu G, Li R, Zhang Y, et al. Constructing high coordination number of Ir–O–Ru bonds in IrRuOx nanomeshes for highly stable acidic oxygen evolution reaction. Nano Research, 2024, 17(6): 5073-5079. https://doi.org/10.1007/s12274-024-6524-6
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Abstract Full text Electronic supplementary material About this article

IrRu bimetallic oxides are recognized as the promising acidic oxygen evolution reaction (OER) catalysts, but breaking the trade-off between their activity and stability is an unresolved question. Meanwhile, addressing the issues of mass transport obstruction of IrRu bimetallic oxides under high current remains a challenge for the development of proton exchange membrane water electrolysis (PEM-WE). Herein, we prepared an IrRuOx nanomeshes (IrRuOx NMs) with high coordination number (CN) of Ir–O–Ru bonds in a mixed molten salt with high solubility of the Ir/Ru precursor. X-ray absorption spectroscopy analysis revealed that the IrRuOx NMs possess high coordination number of Ir–O–Ru bonds (CNIr–O–Ru = 5.6) with a distance of 3.18 Å. Moreover, the nanomesh structures of IrRuOx NMs provided hierarchical channels to accelerate the transport of oxygen and water, thus further improving the electrochemical activity. Consequently, the IrRuOx NMs as OER catalysts can simultaneously achieve high activity and stability with low overpotential of 196 mV to reach 10 mA·cm−2 and slightly increase by 70 mV over 650 h test. Differential electrochemical mass spectrometry tests suggest that the preferred OER mechanism for IrRuOx NMs is the adsorbent evolution mechanism, which is beneficial for the robust structural stability.


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Electronic supplementary material
About this article

Constructing high coordination number of Ir–O–Ru bonds in IrRuOx nanomeshes for highly stable acidic oxygen evolution reaction

Show Author's information Ge Yu1,§, Ruilong Li1,§, Yida Zhang2, Xingen Lin1, Gongming Wang1( ), Xun Hong1( )
Center of Advanced Nanocatalysis (CAN), Department of Applied Chemistry, University of Science and Technology of China, Hefei 230026, China
National Synchrotron Radiation Laboratory (NSRL), University of Science and Technology of China, Hefei 230029, China

§ Ge Yu and Ruilong Li contributed equally to this work.

Abstract

IrRu bimetallic oxides are recognized as the promising acidic oxygen evolution reaction (OER) catalysts, but breaking the trade-off between their activity and stability is an unresolved question. Meanwhile, addressing the issues of mass transport obstruction of IrRu bimetallic oxides under high current remains a challenge for the development of proton exchange membrane water electrolysis (PEM-WE). Herein, we prepared an IrRuOx nanomeshes (IrRuOx NMs) with high coordination number (CN) of Ir–O–Ru bonds in a mixed molten salt with high solubility of the Ir/Ru precursor. X-ray absorption spectroscopy analysis revealed that the IrRuOx NMs possess high coordination number of Ir–O–Ru bonds (CNIr–O–Ru = 5.6) with a distance of 3.18 Å. Moreover, the nanomesh structures of IrRuOx NMs provided hierarchical channels to accelerate the transport of oxygen and water, thus further improving the electrochemical activity. Consequently, the IrRuOx NMs as OER catalysts can simultaneously achieve high activity and stability with low overpotential of 196 mV to reach 10 mA·cm−2 and slightly increase by 70 mV over 650 h test. Differential electrochemical mass spectrometry tests suggest that the preferred OER mechanism for IrRuOx NMs is the adsorbent evolution mechanism, which is beneficial for the robust structural stability.

Keywords: oxygen evolution reaction, mass transport, proton exchange membrane device, IrRuOx, Ir–O–Ru bonds, two-dimensional (2D) nanomesh

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Publication history
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Acknowledgements

Publication history

Received: 09 January 2024
Revised: 26 January 2024
Accepted: 28 January 2024
Published: 14 March 2024
Issue date: June 2024

Copyright

© Tsinghua University Press 2024

Acknowledgements

Acknowledgements

The National Key Research and Development Program of China (Nos. 2018YFA0702001 and 2021YFA1500400), the National Natural Science Foundation of China (Nos. 22371268 and 22175163), Fundamental Research Funds for the Central Universities (No. WK2060000016), Anhui Development and Reform Commission (No. AHZDCYCX-2SDT2023-07), and Youth Innovation Promotion Association of the Chinese Academy of Science (No. 2018494) supported this work. We acknowledge USTC Tang Scholar.

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