TITLE

Bioinspired molecular co-catalysts bonded to a silicon photocathode for solar hydrogen evolution

AUTHOR(S)
Yidong Hou; Abrams, Billie L.; Vesborg, Peter C. K.; Björketun, Mårten E.; Herbst, Konrad; Bech, Lone; Setti, Alessandro M.; Damsgaard, Christian D.; Pedersen, Thomas; Hansen, Ole; Rossmeisl, Jan; Dahl, Søren; Nørskov, Jens K.; Chorkendorff, Ib
PUB. DATE
June 2011
SOURCE
Nature Materials;Jun2011, Vol. 10 Issue 6, p434
SOURCE TYPE
Academic Journal
DOC. TYPE
Article
ABSTRACT
The production of fuels from sunlight represents one of the main challenges in the development of a sustainable energy system. Hydrogen is the simplest fuel to produce and although platinum and other noble metals are efficient catalysts for photoelectrochemical hydrogen evolution, earth-abundant alternatives are needed for large-scale use. We show that bioinspired molecular clusters based on molybdenum and sulphur evolve hydrogen at rates comparable to that of platinum. The incomplete cubane-like clusters (Mo3S4) efficiently catalyse the evolution of hydrogen when coupled to a p-type Si semiconductor that harvests red photons in the solar spectrum. The current densities at the reversible potential match the requirement of a photoelectrochemical hydrogen production system with a solar-to-hydrogen efficiency in excess of 10% (ref. ). The experimental observations are supported by density functional theory calculations of the Mo3S4 clusters adsorbed on the hydrogen-terminated Si(100) surface, providing insights into the nature of the active site.
ACCESSION #
60780333

 

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