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Reaction kinetics and interplay of two different surface states on hematite photoanodes for water oxidation

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  • Jingguo Li

    (University of Zurich)

  • Wenchao Wan

    (University of Zurich)

  • Carlos A. Triana

    (University of Zurich)

  • Hang Chen

    (University of Zurich)

  • Yonggui Zhao

    (University of Zurich)

  • Christos K. Mavrokefalos

    (University of Zurich)

  • Greta R. Patzke

    (University of Zurich)

Abstract

Understanding the function of surface states on photoanodes is crucial for unraveling the underlying reaction mechanisms of water oxidation. For hematite photoanodes, only one type of surface states with higher oxidative energy (S1) has been proposed and verified as reaction intermediate, while the other surface state located at lower potentials (S2) was assigned to inactive or recombination sites. Through employing rate law analyses and systematical (photo)electrochemical characterizations, here we show that S2 is an active reaction intermediate for water oxidation as well. Furthermore, we demonstrate that the reaction kinetics and dynamic interactions of both S1 and S2 depend significantly on operational parameters, such as illumination intensity, nature of the electrolyte, and applied potential. These insights into the individual reaction kinetics and the interplay of both surface states are decisive for designing efficient photoanodes.

Suggested Citation

  • Jingguo Li & Wenchao Wan & Carlos A. Triana & Hang Chen & Yonggui Zhao & Christos K. Mavrokefalos & Greta R. Patzke, 2021. "Reaction kinetics and interplay of two different surface states on hematite photoanodes for water oxidation," Nature Communications, Nature, vol. 12(1), pages 1-9, December.
    • Handle: RePEc:nat:natcom:v:12:y:2021:i:1:d:10.1038_s41467-020-20510-8
    DOI: 10.1038/s41467-020-20510-8
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    Cited by:

    1. Jiaming Miao & Cheng Lin & Xiaojia Yuan & Yang An & Yan Yang & Zhaosheng Li & Kan Zhang, 2024. "Supramolecular catalyst with [FeCl4] unit boosting photoelectrochemical seawater splitting via water nucleophilic attack pathway," Nature Communications, Nature, vol. 15(1), pages 1-10, December.
    2. Yuan Lu & Byoung Guan Lee & Cheng Lin & Tae-Kyung Liu & Zhipeng Wang & Jiaming Miao & Sang Ho Oh & Ki Chul Kim & Kan Zhang & Jong Hyeok Park, 2024. "Solar-driven highly selective conversion of glycerol to dihydroxyacetone using surface atom engineered BiVO4 photoanodes," Nature Communications, Nature, vol. 15(1), pages 1-11, December.

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