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Synergistic Ru/RuO2 heterojunctions stabilized by carbon coating as efficient and stable bifunctional electrocatalysts for acidic overall water splitting

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Abstract

The development of highly active and stable acidic water oxidation electrocatalysts is of great significant for promoting the industrial application of proton exchange membrane electrolyzers. Ru-based catalysts have broad application prospects in acidic water oxidation, but their limitations in stability and activity hinder their further application. Herein, a nitrogen-doped carbon (NC) coated porous Ru/RuO2 heterojunctional hollow sphere (Ru/RuO2/NC) is designed as high-active and stable bifunctional electrocatalyst for acidic oxygen evolution reaction (OER) and hydrogen evolution reaction (HER). In synthesis, the key is to use mesoporous polydopamine spheres as a template for forming hollow spheres, a source of NC coating and a reducing agent for forming Ru/RuO2 heterojunction. The Ru/RuO2 heterojunction adjusts the electronic structure of Ru active sites, optimizing the adsorption of intermediate species. Furthermore, the NC coating and the interaction between NC and Ru/RuO2 effectively prevent Ru from over-oxidation and dissolution. The porous hollow structure provides more exposed active sites and promotes mass transfer. Impressively, Ru/RuO2/NC exhibits outstanding OER and HER performance with low overpotentials of 211 and 32 mV at 10 mA·cm−2, respectively, and shows excellent stability. The acid water splitting electrolyzer, based on the bifunctional Ru/RuO2/NC, requires low cell voltages of 1.46 and 1.76 V at 10 and 100 mA·cm−2, respectively, with good stability for over 100 h operation, surpassing Pt/C∥RuO2 and most of the reported catalysts.

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Acknowledgements

This work was financially supported by the National Key Research and Development Program of China (No. 2022YFA1503002), the National Natural Science Foundation of China (Nos. 22271081 and 91961111), the Natural Science Foundation of Heilongjiang Province (No. ZD2021B003), the University Nursing Program for Young Scholars with Creative Talents in Heilongjiang Province (No. UNPYSCT-2020004), and the Heilongjiang University Excellent Youth Foundation.

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  1. Key Laboratory of Functional Inorganic Material Chemistry, Ministry of Education of the People’s Republic of China, Heilongjiang University, Harbin, 150080, China

    Man Wu, Yuying Fan, Yang Huang, Dongxu Wang, Ying Xie, Aiping Wu & Chungui Tian

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  1. Man Wu
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  2. Yuying Fan
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  3. Yang Huang
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Correspondence to Aiping Wu or Chungui Tian.

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Electronic Supplementary Material: Synergistic Ru/RuO2 heterojunctions stabilized by carbon coating as efficient and stable bifunctional electrocatalysts for acidic overall water splitting

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Wu, M., Fan, Y., Huang, Y. et al. Synergistic Ru/RuO2 heterojunctions stabilized by carbon coating as efficient and stable bifunctional electrocatalysts for acidic overall water splitting. Nano Res. (2024). https://doi.org/10.1007/s12274-024-6696-0

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