Unassisted photoelectrochemical water splitting exceeding 7% solar-to-hydrogen conversion efficiency using photon recycling

Xinjian Shi, Hokyeong Jeong, Seung Jae Oh, Ming Ma, Kan Zhang, Jeong Kwon, In Taek Choi, Il Yong Choi, Hwan Kyu Kim, Jong Kyu Kim, Jong Hyeok Park

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79 Citations (Scopus)

Abstract

Various tandem cell configurations have been reported for highly efficient and spontaneous hydrogen production from photoelectrochemical solar water splitting. However, there is a contradiction between two main requirements of a front photoelectrode in a tandem cell configuration, namely, high transparency and high photocurrent density. Here we demonstrate a simple yet highly effective method to overcome this contradiction by incorporating a hybrid conductive distributed Bragg reflector on the back side of the transparent conducting substrate for the front photoelectrochemical electrode, which functions as both an optical filter and a conductive counter-electrode of the rear dye-sensitized solar cell. The hybrid conductive distributed Bragg reflectors were designed to be transparent to the long-wavelength part of the incident solar spectrum (>500 nm) for the rear solar cell, while reflecting the short-wavelength photons ( <500 nm) which can then be absorbed by the front photoelectrochemical electrode for enhanced photocurrent generation.

Original languageEnglish
Article number11943
JournalNature communications
Volume7
DOIs
Publication statusPublished - 2016 Jun 21

All Science Journal Classification (ASJC) codes

  • Chemistry(all)
  • Biochemistry, Genetics and Molecular Biology(all)
  • Physics and Astronomy(all)

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    Shi, X., Jeong, H., Oh, S. J., Ma, M., Zhang, K., Kwon, J., Choi, I. T., Choi, I. Y., Kim, H. K., Kim, J. K., & Park, J. H. (2016). Unassisted photoelectrochemical water splitting exceeding 7% solar-to-hydrogen conversion efficiency using photon recycling. Nature communications, 7, [11943]. https://doi.org/10.1038/ncomms11943