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Issue 7, 2011
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CO2 photoreduction at enzyme-modified metal oxide nanoparticles

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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 oxide nanoparticles functionalised with the enzyme carbon monoxide dehydrogenase (CODH), and sensitised to visible light using a ruthenium bipyridyl photosensitiser. An anatase/rutile TiO2 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.

Graphical abstract: CO2 photoreduction at enzyme-modified metal oxide nanoparticles

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The article was received on 16 Dec 2010, accepted on 07 Mar 2011 and first published on 25 Mar 2011

Article type: Paper
DOI: 10.1039/C0EE00780C
Energy Environ. Sci., 2011,4, 2393-2399

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    CO2 photoreduction at enzyme-modified metal oxide nanoparticles

    T. W. Woolerton, S. Sheard, E. Pierce, S. W. Ragsdale and F. A. Armstrong, Energy Environ. Sci., 2011, 4, 2393
    DOI: 10.1039/C0EE00780C

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