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Electrochemical generation of hydrogen peroxide from a zinc gallium oxide anode with dual active sites

Author

Listed:
  • Lejing Li

    (The Chinese University of Hong Kong)

  • Zhuofeng Hu

    (Sun Yat-sen University)

  • Yongqiang Kang

    (Tsinghua Shenzhen International Graduate School, Tsinghua University)

  • Shiyu Cao

    (Central China Normal University)

  • Liangpang Xu

    (The Chinese University of Hong Kong)

  • Luo Yu

    (The Chinese University of Hong Kong)

  • Lizhi Zhang

    (Central China Normal University)

  • Jimmy C. Yu

    (The Chinese University of Hong Kong)

Abstract

Electrochemical water oxidation enables the conversion of H2O to H2O2. It holds distinct advantages to the O2 reduction reaction, which is restricted by the inefficient mass transfer and limited solubility of O2 in aqueous media. Nonetheless, most reported anodes suffer from high overpotentials (usually >1000 mV) and low selectivity. Electrolysis at high overpotentials often causes serious decomposition of peroxides and leads to declined selectivity. Herein, we report a ZnGa2O4 anode with dual active sites to improve the selectivity and resist the decomposition of peroxides. Its faradaic efficiency reaches 82% at 2.3 V versus RHE for H2O2 generation through both direct (via OH−) and indirect (via HCO3−) pathways. The percarbonate is the critical species generated through the conversion of bicarbonate at Ga-Ga dual sites. The peroxy bond is stable on the surface of the ZnGa2O4 anode, significantly improving faradaic efficiency.

Suggested Citation

  • Lejing Li & Zhuofeng Hu & Yongqiang Kang & Shiyu Cao & Liangpang Xu & Luo Yu & Lizhi Zhang & Jimmy C. Yu, 2023. "Electrochemical generation of hydrogen peroxide from a zinc gallium oxide anode with dual active sites," Nature Communications, Nature, vol. 14(1), pages 1-12, December.
    • Handle: RePEc:nat:natcom:v:14:y:2023:i:1:d:10.1038_s41467-023-37007-9
    DOI: 10.1038/s41467-023-37007-9
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    References listed on IDEAS

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    1. Xinjian Shi & Samira Siahrostami & Guo-Ling Li & Yirui Zhang & Pongkarn Chakthranont & Felix Studt & Thomas F. Jaramillo & Xiaolin Zheng & Jens K. Nørskov, 2017. "Understanding activity trends in electrochemical water oxidation to form hydrogen peroxide," Nature Communications, Nature, vol. 8(1), pages 1-6, December.
    2. Ma, Jia & Choudhury, Nurul A. & Sahai, Yogeshwar, 2010. "A comprehensive review of direct borohydride fuel cells," Renewable and Sustainable Energy Reviews, Elsevier, vol. 14(1), pages 183-199, January.
    3. Qizhan Zhang & Minghua Zhou & Gengbo Ren & Yawei Li & Yanchun Li & Xuedong Du, 2020. "Highly efficient electrosynthesis of hydrogen peroxide on a superhydrophobic three-phase interface by natural air diffusion," Nature Communications, Nature, vol. 11(1), pages 1-11, December.
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