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Solar H2 generation in water with a CuCrO2 photocathode modified with an organic dye and molecular Ni catalyst

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Abstract

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 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 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.

Graphical abstract: Solar H2 generation in water with a CuCrO2 photocathode modified with an organic dye and molecular Ni catalyst

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Publication details

The article was received on 16 Oct 2017, accepted on 26 Nov 2017 and first published on 27 Nov 2017


Article type: Edge Article
DOI: 10.1039/C7SC04476C
Citation: Chem. Sci., 2018, Advance Article
  • Open access: Creative Commons BY license
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    Solar H2 generation in water with a CuCrO2 photocathode modified with an organic dye and molecular Ni catalyst

    C. E. Creissen, J. Warnan and E. Reisner, Chem. Sci., 2018, Advance Article , DOI: 10.1039/C7SC04476C

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