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Photocatalytic water splitting by N-TiO2 on MgO (111) with exceptional quantum efficiencies at elevated temperatures

Author

Listed:
  • Yiyang Li

    (University of Oxford)

  • Yung-Kang Peng

    (University of Oxford)

  • Liangsheng Hu

    (University of Oxford
    Hong Kong Polytechnic University)

  • Jianwei Zheng

    (University of Oxford)

  • Dharmalingam Prabhakaran

    (University of Oxford)

  • Simson Wu

    (University of Oxford)

  • Timothy J. Puchtler

    (University of Oxford)

  • Mo Li

    (University of Oxford)

  • Kwok-Yin Wong

    (Hong Kong Polytechnic University)

  • Robert A. Taylor

    (University of Oxford)

  • Shik Chi Edman Tsang

    (University of Oxford)

Abstract

Photocatalytic water splitting is attracting enormous interest for the storage of solar energy but no practical method has yet been identified. In the past decades, various systems have been developed but most of them suffer from low activities, a narrow range of absorption and poor quantum efficiencies (Q.E.) due to fast recombination of charge carriers. Here we report a dramatic suppression of electron-hole pair recombination on the surface of N-doped TiO2 based nanocatalysts under enhanced concentrations of H+ and OH−, and local electric field polarization of a MgO (111) support during photolysis of water at elevated temperatures. Thus, a broad optical absorption is seen, producing O2 and H2 in a 1:2 molar ratio with a H2 evolution rate of over 11,000 μmol g−1 h−1 without any sacrificial reagents at 270 °C. An exceptional range of Q.E. from 81.8% at 437 nm to 3.2% at 1000 nm is also reported.

Suggested Citation

  • Yiyang Li & Yung-Kang Peng & Liangsheng Hu & Jianwei Zheng & Dharmalingam Prabhakaran & Simson Wu & Timothy J. Puchtler & Mo Li & Kwok-Yin Wong & Robert A. Taylor & Shik Chi Edman Tsang, 2019. "Photocatalytic water splitting by N-TiO2 on MgO (111) with exceptional quantum efficiencies at elevated temperatures," Nature Communications, Nature, vol. 10(1), pages 1-9, December.
    • Handle: RePEc:nat:natcom:v:10:y:2019:i:1:d:10.1038_s41467-019-12385-1
    DOI: 10.1038/s41467-019-12385-1
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    Cited by:

    1. Ma, Jing & Dai, Jianan & Duan, Yinli & Zhang, Jiajia & Qiang, Liangsheng & Xue, Juanqin, 2020. "Fabrication of PANI-TiO2/rGO hybrid composites for enhanced photocatalysis of pollutant removal and hydrogen production," Renewable Energy, Elsevier, vol. 156(C), pages 1008-1018.
    2. Banerjee, Debarun & Kushwaha, Nidhi & Shetti, Nagaraj P. & Aminabhavi, Tejraj M. & Ahmad, Ejaz, 2022. "Green hydrogen production via photo-reforming of bio-renewable resources," Renewable and Sustainable Energy Reviews, Elsevier, vol. 167(C).
    3. Yang Wang & Shuhao Wang & Yanze Meng & Zhen Liu & Dijie Li & Yunyang Bai & Guoliang Yuan & Yaojin Wang & Xuehui Zhang & Xiaoguang Li & Xuliang Deng, 2022. "Pyro-catalysis for tooth whitening via oral temperature fluctuation," Nature Communications, Nature, vol. 13(1), pages 1-13, December.

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