A Silicon-Based Heterojunction Integrated with a Molecular Excited State in a Water-Splitting Tandem Cell

Bing Shan, M. Kyle Brennaman, Ludovic Troian-Gautier, Yanming Liu, Animesh Nayak, Christina M. Klug, Ting Ting Li, R. Morris Bullock, Thomas J. Meyer

Research output: Contribution to journalArticle

5 Citations (Scopus)

Abstract

Semiconductor-based photocathodes with high light-absorption capability are of interest in the production of solar fuels, but many of them are limited by low efficiencies due to rapid interfacial back electron transfer. We demonstrate here that a nanowire-structured p-type Si (p-Si) electrode, surface-modified with a perylene-diimide derivative (PDI′), can undergo photoreduction of a surface-bound, water reduction catalyst toward efficient H2 evolution under a low applied bias. At the electrode interface, the PDI′ layer converts green light into high-energy holes at its excited state for extraction of photogenerated electrons at the photoexcited p-Si. The photogenerated electrons at the reduced PDI′ are subsequently transferred to the molecular H2-evolution catalyst. Involvement of the photoexcited PDI′ enables effective redox separation between the electrons at the reduced catalyst and the holes at the valence band of p-Si. The heterojunction photocathode was used in a tandem cell by coupling with a dye-sensitized photoanode for solar-driven water splitting into H2 and O2.

Original languageEnglish
Pages (from-to)10390-10398
Number of pages9
JournalJournal of the American Chemical Society
Volume141
Issue number26
DOIs
Publication statusPublished - Jul 3 2019

ASJC Scopus subject areas

  • Catalysis
  • Chemistry(all)
  • Biochemistry
  • Colloid and Surface Chemistry

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    Shan, B., Brennaman, M. K., Troian-Gautier, L., Liu, Y., Nayak, A., Klug, C. M., Li, T. T., Bullock, R. M., & Meyer, T. J. (2019). A Silicon-Based Heterojunction Integrated with a Molecular Excited State in a Water-Splitting Tandem Cell. Journal of the American Chemical Society, 141(26), 10390-10398. https://doi.org/10.1021/jacs.9b04238