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Photoelectrocatalytic H2 evolution from integrated photocatalysts adsorbed on NiO

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Abstract

A new approach to increasing the faradaic efficiency of dye-sensitised photocathodes for H2 evolution from water, using integrated photocatalysts, furnished with ester groups on the peripheral ligands, [Ru(decb)2(bpt)PdCl(H2O)](PF6)2 (1) and [Ru(decb)2(2,5-bpp)PtI(CH3CN)](PF6)2 (2), (decb = 4,4′-diethylcarboxy-2,2′-bipyridine, bpp = 2,2':5′,2′′-terpyridine, bpt = 3,5-bis(2-pyridyl)-1,2,4-triazole) is described. Overall, 1|NiO is superior to previously reported photocathodes, producing photocurrent densities of 30–35 μA cm−2 at an applied bias of −0.2 V vs. Ag/AgCl over 1 hour of continuous white light irradiation, resulting in the generation of 0.41 μmol h−1 cm−2 of H2 with faradaic efficiencies of up to 90%. Furthermore, surface analysis of the photocathodes before and after photoelectrocatalysis revealed that the ruthenium bipyridyl chromophore and Pd catalytic centre (1) were photochemically stable, highlighting the benefits of the approach towards robust, hybrid solar-to-fuel devices.

Graphical abstract: Photoelectrocatalytic H2 evolution from integrated photocatalysts adsorbed on NiO

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Publication details

The article was received on 11 Jun 2018, accepted on 03 Oct 2018 and first published on 04 Oct 2018


Article type: Edge Article
DOI: 10.1039/C8SC02575D
Citation: Chem. Sci., 2018, Advance Article
  • Open access: Creative Commons BY license
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    Photoelectrocatalytic H2 evolution from integrated photocatalysts adsorbed on NiO

    N. Põldme, L. O'Reilly, I. Fletcher, J. Portoles, I. V. Sazanovich, M. Towrie, C. Long, J. G. Vos, M. T. Pryce and E. A. Gibson, Chem. Sci., 2018, Advance Article , DOI: 10.1039/C8SC02575D

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