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Unassisted photoelectrochemical CO2-to-liquid fuel splitting over 12% solar conversion efficiency

Author

Listed:
  • Bilawal Khan

    (City University of Hong Kong)

  • M. Bilal Faheem

    (Syracuse University)

  • Karthik Peramaiah

    (Energy and Environment
    King Abdullah University of Science and Technology)

  • Jinlan Nie

    (University of Electronic Science and Technology of China)

  • Hao Huang

    (King Abdullah University of Science and Technology)

  • Zhongxiao Li

    (City University of Hong Kong)

  • Chen Liu

    (King Abdullah University of Science and Technology)

  • Kuo-Wei Huang

    (Energy and Environment
    King Abdullah University of Science and Technology)

  • Jr-Hau He

    (City University of Hong Kong)

Abstract

The increasing need to control anthropogenic CO2 emissions and conversion to fuels features the necessity for innovative solutions, one of which is photoelectrochemical system. This approach, capable of yielding gaseous production progressively, is facing challenges for liquid fuels generation due to optical, electrical, and catalytic properties. This study employs a standalone photoelectrochemical setup, in which InGaP/GaAs/Ge photoanode is integrated with tin-modified bismuth oxide cathode to convert CO2 into liquid formic acid. In unassisted two-electrode assembly, setup exemplifies its operational durability for 100 h, during which it maintains an average Faradaic efficiency of 88% with 17.3 mmol L–1 h–1 of yield, thereby excelling in average solar-to-fuel conversion efficiency at 12% with 60% of electrical energy efficiency under one sun illumination. This significant performance is further associated with metal-semiconductor interface formation between tin and bismuth oxide, which bridges electronic structures and generates an electric field at their interfaces. This study outperforms conventional solar-driven systems in operational durability and liquid fuel production.

Suggested Citation

  • Bilawal Khan & M. Bilal Faheem & Karthik Peramaiah & Jinlan Nie & Hao Huang & Zhongxiao Li & Chen Liu & Kuo-Wei Huang & Jr-Hau He, 2024. "Unassisted photoelectrochemical CO2-to-liquid fuel splitting over 12% solar conversion efficiency," Nature Communications, Nature, vol. 15(1), pages 1-13, December.
  • Handle: RePEc:nat:natcom:v:15:y:2024:i:1:d:10.1038_s41467-024-51088-0
    DOI: 10.1038/s41467-024-51088-0
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    References listed on IDEAS

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    2. Lei Fan & Chuan Xia & Peng Zhu & Yingying Lu & Haotian Wang, 2020. "Electrochemical CO2 reduction to high-concentration pure formic acid solutions in an all-solid-state reactor," Nature Communications, Nature, vol. 11(1), pages 1-9, December.
    3. Qiufang Gong & Pan Ding & Mingquan Xu & Xiaorong Zhu & Maoyu Wang & Jun Deng & Qing Ma & Na Han & Yong Zhu & Jun Lu & Zhenxing Feng & Yafei Li & Wu Zhou & Yanguang Li, 2019. "Structural defects on converted bismuth oxide nanotubes enable highly active electrocatalysis of carbon dioxide reduction," Nature Communications, Nature, vol. 10(1), pages 1-10, December.
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