Solar H2 generation in water with a CuCrO2 photocathode modified with an organic dye and molecular Ni catalyst.
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Creissen, C., Warnan, J., & Reisner, E. (2018). Solar H2 generation in water with a CuCrO2 photocathode modified with an organic dye and molecular Ni catalyst.. Chemical science, 9 (6), 1439-1447. https://doi.org/10.1039/c7sc04476c
Dye-sensitised photoelectrochemical (DSPEC) cells have emerged in recent years as a route to solar fuel production. However, fuel-forming photocathodes are presently limited by photo-corrodible narrow band gap semiconductors or the small range of available wide bandgap p-type semiconductors such as NiO that display low performance with dyes. Here, we introduce CuCrO2 as a suitable p-type semiconductor for visible light-driven H2 generation upon co-immobilisation of a phosphonated diketopyrrolopyrrole dye with a Nibis( diphosphine) catalyst. The hybrid CuCrO2 photocathode displays an early photocurrent onset potential of +0.75 V vs. RHE and delivers a photocurrent of 15 μA cm–2 at 0.0 V vs. RHE in pH 3 aqueous electrolyte solution under UV-filtered simulated solar irradiation. Controlled potential photoelectrolysis at 0.0 V vs. RHE shows good stability and yields a Ni catalyst-based turnover number of 126 ± 13 towards H2 after 2 h. This precious metal-free system outperforms an analogous NiO|dye/catalyst assembly and therefore highlights the benefits of using CuCrO2 as a novel material for DSPEC applications.
Christian Doppler Forschungsgesellschaft (unknown)
EPSRC (via Loughborough University) (EP/J017361/1)
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External DOI: https://doi.org/10.1039/c7sc04476c
This record's URL: https://www.repository.cam.ac.uk/handle/1810/273167
Attribution 4.0 International
Licence URL: http://creativecommons.org/licenses/by/4.0/
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