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Cr dopant mediates hydroxyl spillover on RuO2 for high-efficiency proton exchange membrane electrolysis

Author

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  • Yu Shen

    (Shanghai University of Electric Power)

  • Xiao-Long Zhang

    (New Cornerstone Science Laboratory, Department of Chemistry, University of Science and Technology of China)

  • Ming-Rong Qu

    (New Cornerstone Science Laboratory, Department of Chemistry, University of Science and Technology of China)

  • Jie Ma

    (Shanghai University of Electric Power)

  • Sheng Zhu

    (Shanghai University of Electric Power
    Shanghai Institute of Pollution Control and Ecological Security)

  • Yu-Lin Min

    (Shanghai University of Electric Power
    Shanghai Institute of Pollution Control and Ecological Security)

  • Min-Rui Gao

    (New Cornerstone Science Laboratory, Department of Chemistry, University of Science and Technology of China)

  • Shu-Hong Yu

    (New Cornerstone Science Laboratory, Department of Chemistry, University of Science and Technology of China)

Abstract

Simultaneously improving the activity and stability of catalysts for anodic oxygen evolution reaction (OER) in proton exchange membrane water electrolysis (PEMWE) remains a notable challenge. Here, we report a chromium-doped ruthenium dioxide with oxygen vacancies, termed Cr0.2Ru0.8O2-x, that drives OER with an overpotential of 170 mV at 10 mA cm−2 and operates stably over 2000 h in acidic media. Experimental and theoretical studies show that the synergy of Cr dopant and oxygen vacancy induces an unconventional dopant-mediated hydroxyl spillover mechanism. Such dynamic hydroxyl spillover from Cr dopant to Ru active site changes the rate-determining step from OOH* formation to O2 formation and thus greatly improves the OER performance. Moreover, the Cr dopant and oxygen vacancy also play a crucial role in stabilizing surface Ru and lattice oxygen in the Ru-O-Cr structural motif. When assembled into the anode of a practical PEMWE device, Cr0.2Ru0.8O2-x enables long-term durability of over 200 h at an ampere-level current density and 60 degrees centigrade.

Suggested Citation

  • Yu Shen & Xiao-Long Zhang & Ming-Rong Qu & Jie Ma & Sheng Zhu & Yu-Lin Min & Min-Rui Gao & Shu-Hong Yu, 2024. "Cr dopant mediates hydroxyl spillover on RuO2 for high-efficiency proton exchange membrane electrolysis," Nature Communications, Nature, vol. 15(1), pages 1-12, December.
    • Handle: RePEc:nat:natcom:v:15:y:2024:i:1:d:10.1038_s41467-024-51871-z
    DOI: 10.1038/s41467-024-51871-z
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