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A schematic of the hydrogenase TiO2 system for hydrogen evolution. Visible light sensitization fuels electron transfer from TiO2 to hydrogenase enzymes. This occurs most efficiently when the distal [4Fe-4S] cluster of hydrogenase is near the surface of TiO2, the electroactive configuration. Reprinted with permission from Reisner E, Powell DJ, Cavazza C, Fontecilla-Camps JC, Armstrong FA. (2009) J. Am. Chem. Soc. 131, 18457-18466. Copyright (2009) American Chemical Society
