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Photobiocatalytic H2 evolution of GaN:ZnO and [FeFe]-hydrogenase recombinant Escherichia coli

Abstract

The need for sustainable, renewable and low-cost approaches is a driving force behind the development of solar-to-H2 conversion technologies. This study aims to develop new strategy using visible-light photocatalyst coupled to biocatalyst for H2 production. Photocatalytic methyl viologen (MV2+) reduction activity was investigated to discover active oxynitrides. In comparative studies with LaTiO2N, BaTaO¬2N and Ta3N5, it was revealed that the suitable surface area, band gap and band edge potentials are some physical factors that responsible for photocatalytic behaviors of GaN:ZnO on MV2+ reduction. The activity is enhanced at higher concentrations and alkaline pH of triethanolamine (TEOA). The expression of active [FeFe]-hydrogenase from Escherichia coli (Hyd+ E. coli) as a recombinant biocatalyst was confirmed by MV•+-dependent H2 production activity. In the photobiocatalytic system of GaN:ZnO and Hyd+ E. coli, the rate of H2 production reached the maximum level in the presence of MV2+ as an electron mediator at neutral pH as biocompatible condition. The present work reveals a novel hybrid system of H2 production using visible-light active GaN:ZnO coupled to Hyd+ E. coli, which shows the feasibility to be developed for photobiocatalytic H2 evolution under solar light.

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Supplementary files

Article information


Submitted
21 Jan 2020
Accepted
07 May 2020
First published
12 May 2020

Catal. Sci. Technol., 2020, Accepted Manuscript
Article type
Paper

Photobiocatalytic H2 evolution of GaN:ZnO and [FeFe]-hydrogenase recombinant Escherichia coli

N. KOSEM, Y. Honda, M. Watanabe, A. Takagaki, Z. P. Tehrani, F. Haydous, T. Lippert and T. Ishihara, Catal. Sci. Technol., 2020, Accepted Manuscript , DOI: 10.1039/D0CY00128G

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