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Hydrogen-substituted graphdiyne encapsulated cuprous oxide photocathode for efficient and stable photoelectrochemical water reduction

Author

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  • Xue Zhou

    (East China Normal University)

  • Baihe Fu

    (East China Normal University)

  • Linjuan Li

    (East China Normal University)

  • Zheng Tian

    (East China Normal University)

  • Xiankui Xu

    (East China Normal University)

  • Zihao Wu

    (East China Normal University
    Peking University)

  • Jing Yang

    (East China Normal University
    Fudan University)

  • Zhonghai Zhang

    (East China Normal University)

Abstract

Photoelectrochemical (PEC) water splitting is an appealing approach for “green” hydrogen generation. The natural p-type semiconductor of Cu2O is one of the most promising photocathode candidates for direct hydrogen generation. However, the Cu2O-based photocathodes still suffer severe self-photo-corrosion and fast surface electron-hole recombination issues. Herein, we propose a facile in-situ encapsulation strategy to protect Cu2O with hydrogen-substituted graphdiyne (HsGDY) and promote water reduction performance. The HsGDY encapsulated Cu2O nanowires (HsGDY@Cu2O NWs) photocathode demonstrates a high photocurrent density of −12.88 mA cm−2 at 0 V versus the reversible hydrogen electrode under 1 sun illumination, approaching to the theoretical value of Cu2O. The HsGDY@Cu2O NWs photocathode as well as presents excellent stability and contributes an impressive hydrogen generation rate of 218.2 ± 11.3 μmol h−1cm−2, which value has been further magnified to 861.1 ± 24.8 μmol h−1cm−2 under illumination of concentrated solar light. The in-situ encapsulation strategy opens an avenue for rational design photocathodes for efficient and stable PEC water reduction.

Suggested Citation

  • Xue Zhou & Baihe Fu & Linjuan Li & Zheng Tian & Xiankui Xu & Zihao Wu & Jing Yang & Zhonghai Zhang, 2022. "Hydrogen-substituted graphdiyne encapsulated cuprous oxide photocathode for efficient and stable photoelectrochemical water reduction," Nature Communications, Nature, vol. 13(1), pages 1-10, December.
    • Handle: RePEc:nat:natcom:v:13:y:2022:i:1:d:10.1038_s41467-022-33445-z
    DOI: 10.1038/s41467-022-33445-z
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    References listed on IDEAS

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