Bias-free photoelectrochemical water splitting with photosystem II on a dye-sensitized photoanode wired to hydrogenase

Katarzyna P. Sokol, William E. Robinson, Julien Warnan, Nikolay Kornienko, Marc M. Nowaczyk, Adrian Ruff, Jenny Z. Zhang and Erwin Reisner ()
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Katarzyna P. Sokol: University of Cambridge
William E. Robinson: University of Cambridge
Julien Warnan: University of Cambridge
Nikolay Kornienko: University of Cambridge
Marc M. Nowaczyk: Ruhr-Universität Bochum
Adrian Ruff: Ruhr-Universität Bochum
Jenny Z. Zhang: University of Cambridge
Erwin Reisner: University of Cambridge

Nature Energy, 2018, vol. 3, issue 11, 944-951

Abstract: Abstract Natural photosynthesis stores sunlight in chemical energy carriers, but it has not evolved for the efficient synthesis of fuels, such as H2. Semi-artificial photosynthesis combines the strengths of natural photosynthesis with synthetic chemistry and materials science to develop model systems that overcome nature’s limitations, such as low-yielding metabolic pathways and non-complementary light absorption by photosystems I and II. Here, we report a bias-free semi-artificial tandem platform that wires photosystem II to hydrogenase for overall water splitting. This photoelectrochemical cell integrated the red and blue light-absorber photosystem II with a green light-absorbing diketopyrrolopyrrole dye-sensitized TiO2 photoanode, and so enabled complementary panchromatic solar light absorption. Effective electronic communication at the enzyme–material interface was engineered using an osmium-complex-modified redox polymer on a hierarchically structured TiO2. This system provides a design protocol for bias-free semi-artificial Z schemes in vitro and provides an extended toolbox of biotic and abiotic components to re-engineer photosynthetic pathways.

Date: 2018
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DOI: 10.1038/s41560-018-0232-y

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