Inorganic/whole-cell biohybrid photocatalyst for highly efficient hydrogen production from water

Yuki Honda, Motonori Watanabe, Hidehisa Hagiwara, Shintaro Ida, Tatsumi Ishihara

    Research output: Contribution to journalArticlepeer-review

    22 Citations (Scopus)

    Abstract

    To obtain a clean hydrogen production system, we have developed an inorganic-bio hybrid photocatalyst system based on the combination of anatase TiO2, methylviologen (MV) as an electron mediator, and a whole-cell biocatalyst consisting of [FeFe]-hydrogenase and maturase gene-harboring recombinant Escherichia coli; however, the apparent quantum yield at 300 nm (AQY300) for hydrogen production was low (0.3%). The system consists of a two-step reaction: (1) photocatalytic MV reduction by TiO2, and (2) hydrogen production with reduced MV using a biocatalyst. The enhancement of step 1 under biocatalyst-friendly conditions was investigated in an attempt to further improve the reaction efficiency. Among the condition tested, the use of 100 mM Tris-HCl (pH 7), 150 mM NaCl, and 5% (v/v) glycerol with P-25 TiO2 especially enhanced the step 1 reaction by a 300-fold increase in the MV reduction rate compared with previously tested reaction condition (100 mM Tris-HCl (pH 7), 150 mM NaCl, 5% (v/v) glycerol, and 100 mM ascorbate with anatase TiO2). Under the enhanced step 1 reaction, AQY300 and AQY350 for photocatalytic MV reduction reached 60.8% and 52.2%, respectively. The enhanced step 1 reaction thus significantly improved the overall photocatalytic hydrogen productivity of the hybrid system and AQY300 and AQY350 reached 26.4% and 31.2%, respectively. The inorganic-whole-cell biohybrid system can therefore provide noble metal-free, efficient, and clean hydrogen production.

    Original languageEnglish
    Pages (from-to)400-406
    Number of pages7
    JournalApplied Catalysis B: Environmental
    Volume210
    DOIs
    Publication statusPublished - Jan 1 2017

    All Science Journal Classification (ASJC) codes

    • Catalysis
    • Environmental Science(all)
    • Process Chemistry and Technology

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