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Single-atomic-site platinum steers photogenerated charge carrier lifetime of hematite nanoflakes for photoelectrochemical water splitting

Author

Listed:
  • Rui-Ting Gao

    (Inner Mongolia University)

  • Jiangwei Zhang

    (Inner Mongolia University)

  • Tomohiko Nakajima

    (National Institute of Advanced Industrial Science and Technology)

  • Jinlu He

    (Inner Mongolia University)

  • Xianhu Liu

    (Zhengzhou University)

  • Xueyuan Zhang

    (Hunan University)

  • Lei Wang

    (Inner Mongolia University)

  • Limin Wu

    (Inner Mongolia University
    Fudan University)

Abstract

Although much effort has been devoted to improving photoelectrochemical water splitting of hematite (α-Fe2O3) due to its high theoretical solar-to-hydrogen conversion efficiency of 15.5%, the low applied bias photon-to-current efficiency remains a huge challenge for practical applications. Herein, we introduce single platinum atom sites coordination with oxygen atom (Pt-O/Pt-O-Fe) sites into single crystalline α-Fe2O3 nanoflakes photoanodes (SAs Pt:Fe2O3-Ov). The single-atom Pt doping of α-Fe2O3 can induce few electron trapping sites, enhance carrier separation capability, and boost charge transfer lifetime in the bulk structure as well as improve charge carrier injection efficiency at the semiconductor/electrolyte interface. Further introduction of surface oxygen vacancies can suppress charge carrier recombination and promote surface reaction kinetics, especially at low potential. Accordingly, the optimum SAs Pt:Fe2O3-Ov photoanode exhibits the photoelectrochemical performance of 3.65 and 5.30 mA cm−2 at 1.23 and 1.5 VRHE, respectively, with an applied bias photon-to-current efficiency of 0.68% for the hematite-based photoanodes. This study opens an avenue for designing highly efficient atomic-level engineering on single crystalline semiconductors for feasible photoelectrochemical applications.

Suggested Citation

  • Rui-Ting Gao & Jiangwei Zhang & Tomohiko Nakajima & Jinlu He & Xianhu Liu & Xueyuan Zhang & Lei Wang & Limin Wu, 2023. "Single-atomic-site platinum steers photogenerated charge carrier lifetime of hematite nanoflakes for photoelectrochemical water splitting," Nature Communications, Nature, vol. 14(1), pages 1-12, December.
    • Handle: RePEc:nat:natcom:v:14:y:2023:i:1:d:10.1038_s41467-023-38343-6
    DOI: 10.1038/s41467-023-38343-6
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    References listed on IDEAS

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    2. Hemin Zhang & Dongfeng Li & Woo Jin Byun & Xiuli Wang & Tae Joo Shin & Hu Young Jeong & Hongxian Han & Can Li & Jae Sung Lee, 2020. "Gradient tantalum-doped hematite homojunction photoanode improves both photocurrents and turn-on voltage for solar water splitting," Nature Communications, Nature, vol. 11(1), pages 1-11, December.
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