Journal
CHEMICAL SCIENCE
Volume 9, Issue 6, Pages 1439-1447Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/c7sc04476c
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Funding
- Christian Doppler Research Association (Austrian Federal Ministry of Science, Research, and Economy)
- Christian Doppler Research Association (National Foundation for Research, Technology and Development)
- OMV Group
- EPSRC NanoDTC in Cambridge [EP/L015978/1]
- Engineering and Physical Sciences Research Council [1494597] Funding Source: researchfish
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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 H-2 generation upon co-immobilisation of a phosphonated diketopyrrolopyrrole dye with a Ni-bis(diphosphine) catalyst. The hybrid CuCrO2 photocathode displays an early photocurrent onset potential of +0.75 V vs. RHE and delivers a photocurrent of 15 mu A 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 catalystbased turnover number of 126 +/- 13 towards H-2 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.
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