Wittichenite semiconductor of Cu3BiS3 films for efficient hydrogen evolution from solar driven photoelectrochemical water splitting

Dingwang Huang, Lintao Li, Kang Wang, Yan Li, Kuang Feng and Feng Jiang ()
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Dingwang Huang: South China Normal University
Lintao Li: South China Normal University
Kang Wang: South China Normal University
Yan Li: South China Normal University
Kuang Feng: South China Normal University
Feng Jiang: South China Normal University

Nature Communications, 2021, vol. 12, issue 1, 1-10

Abstract: Abstract A highly efficient, low-cost and environmentally friendly photocathode with long-term stability is the goal of practical solar hydrogen evolution applications. Here, we found that the Cu3BiS3 film-based photocathode meets the abovementioned requirements. The Cu3BiS3-based photocathode presents a remarkable onset potential over 0.9 VRHE with excellent photoelectrochemical current densities (~7 mA/cm2 under 0 VRHE) and appreciable 10-hour long-term stability in neutral water solutions. This high onset potential of the Cu3BiS3-based photocathode directly results in a good unbiased operating photocurrent of ~1.6 mA/cm2 assisted by the BiVO4 photoanode. A tandem device of Cu3BiS3-BiVO4 with an unbiased solar-to-hydrogen conversion efficiency of 2.04% is presented. This tandem device also presents high stability over 20 hours. Ultimately, a 5 × 5 cm2 large Cu3BiS3-BiVO4 tandem device module is fabricated for standalone overall solar water splitting with a long-term stability of 60 hours.

Date: 2021
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DOI: 10.1038/s41467-021-24060-5

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