A model system for photoreduction of CO2 to CO using visible light has been extensively studied, using a catalyst for which the CO2/CO reaction is electrochemically reversible. The hybrid system comprises metal oxidenanoparticles functionalised with the enzymecarbon monoxide dehydrogenase (CODH), and sensitised to visible light using a ruthenium bipyridyl photosensitiser. An anatase/rutileTiO2 mixture (Evonik Degussa P25) was selected as the most suitable semiconductor, and CO production rates and stability were examined as a function of each component (photosensitiser, enzyme and TiO2). Tolerance to O2 and effects of different electron donors were also investigated, together with strategies to control enzyme binding at the surface of TiO2 in order to enhance overall activity.
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Energy & Environmental Science
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