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Research Article

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

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.

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Graphical Abstract

Herein, we prepared IrRuOx nanomeshes with hierarchical pores and high coordination number of Ir–O–Ru bonds. In the oxygen evolution reaction (OER), the IrRuOx nanomeshes achieve a low overpotential of 196 mV at the current density of 10 mA·cm−2 and outstanding long-term stability under continuous testing for 650 h.

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 reactionIrRuOxIr–O–Ru bondstwo-dimensional (2D) nanomeshproton exchange membrane devicemass transport

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Nano Research
Volume 17 Issue 6,
June 2024
Pages 5073-5079
DOI: 10.1007/s12274-024-6524-6
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
Topics:
Oxygen evolution reaction

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Received: 09 January 2024
Revised: 26 January 2024
Accepted: 28 January 2024
Published: 14 March 2024
© Tsinghua University Press 2024
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