Photoelectrocatalytic H2 evolution from integrated photocatalysts adsorbed on NiO

A new approach to increasing the faradaic efficiency of dye-sensitised photocathodes for H 2 evolution from water, using integrated photocatalysts, furnished with ester groups on the peripheral ligands, [Ru(decb) 2 (bpt)PdCl(H 2 O)](PF 6 ) 2 ( 1 ) and [Ru(decb) 2 (2,5-bpp)PtI(CH 3 CN)](PF 6 ) 2 ( 2...

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Veröffentlicht in:Chemical science (Cambridge) Jg. 10; H. 1; S. 99 - 112
Hauptverfasser: Põldme, Nils, O'Reilly, Laura, Fletcher, Ian, Portoles, Jose, Sazanovich, Igor V., Towrie, Michael, Long, Conor, Vos, Johannes G., Pryce, Mary T., Gibson, Elizabeth A.
Format: Journal Article
Sprache:Englisch
Veröffentlicht: Cambridge Royal Society of Chemistry 2019
Schlagworte:
Catalysis
Chemistry
Chromophores
Hydrogen evolution
Light irradiation
Nickel oxides
Photocatalysis
Photocatalysts
Photocathodes
Photoelectric effect
Photoelectric emission
Ruthenium
Silver chloride
Surface analysis (chemical)
White light
ISSN:2041-6520, 2041-6539
Online-Zugang:Volltext
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Zusammenfassung:A new approach to increasing the faradaic efficiency of dye-sensitised photocathodes for H 2 evolution from water, using integrated photocatalysts, furnished with ester groups on the peripheral ligands, [Ru(decb) 2 (bpt)PdCl(H 2 O)](PF 6 ) 2 ( 1 ) and [Ru(decb) 2 (2,5-bpp)PtI(CH 3 CN)](PF 6 ) 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 H 2 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.
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LO'R and NP contributed equally to this work.
ISSN:2041-6520
2041-6539
DOI:10.1039/C8SC02575D