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Structure and Electrocatalytical Properties of Electrodeposited M-Ir (M = Co, Ni) Bimetallic Alloy Catalysts with Low Ir Loading Obtained on Copper Foams for Hydrogen Evolution Reaction

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Abstract

M-iridium (M = cobalt (Co), nickel (Ni)) bimetallic alloy catalysts with low iridium (Ir) loading of 0.3–2.0 mg·cm−2 were prepared on copper foam (CF) supports by electrodeposition. The top surface of as-deposited M-Ir catalysts was mainly composed of metallic state and oxides states, such as metallic Ir, Ni(OH)2 or Co(OH)2, Co(Ir) and Ni(Ir) solid solution, Ir oxides. M-Ir catalysts with low Ir loading exhibited excellent catalytic performance. Ni63.4Ir36.6/CF catalyst with low Ir loading of 1.8 mg·cm−2 achieved a current density of 10 mA·cm2 at an overpotential of 52 mV and a Tafel slope of 36 mV·dec−1. Co64.2Ir35.8/CF catalyst with low Ir loading of 0.7 mg·cm−2 was uniformly scattered with small ellipsoidal particles, looking like fine fluff, requiring an overpotential of 51 mV for hydrogen evolution reaction to reach a current density of 10 mA·cm−2, having a Tafel slope of 38 mV·dec−1. After long-term hydrogen evolution testing, M-Ir/CF catalysts exhibited excellent electrocatalytic stability for water splitting in alkaline solution.

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Acknowledgements

The authors wish to thank the referees for their helpful suggestions, and thank Mr. Guang Yang from the Analysis and Testing Center, NERC Biomass of Changzhou University for the discussion and for helping in the XRD measurement. The authors would also like to thank Johnson Matthey plc for the award of the platinum group metal materials used in this research.

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  1. Electrochemistry and Corrosion Laboratory, School of Mechanical Engineering and Rail Transit, Changzhou University, Changzhou, 213164, People’s Republic of China

    Yicheng Zhou, Liu Ju, Yang Yang & Wangping Wu

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  1. Yicheng Zhou
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  2. Liu Ju
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  4. Wangping Wu
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Correspondence to Wangping Wu.

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Zhou, Y., Ju, L., Yang, Y. et al. Structure and Electrocatalytical Properties of Electrodeposited M-Ir (M = Co, Ni) Bimetallic Alloy Catalysts with Low Ir Loading Obtained on Copper Foams for Hydrogen Evolution Reaction. Catal Lett (2024). https://doi.org/10.1007/s10562-024-04598-x

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