Abstract
The production of fuels from sunlight represents one of the main challenges in the development of a sustainable energy system1,2,3,4,5. Hydrogen is the simplest fuel to produce and although platinum and other noble metals are efficient catalysts for photoelectrochemical hydrogen evolution6,7,8,9, earth-abundant alternatives are needed for large-scale use10,11,12,13,14,15. We show that bioinspired molecular clusters based on molybdenum and sulphur evolve hydrogen at rates comparable to that of platinum6. 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. 16). 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.
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Acknowledgements
This work was carried out as part of the Catalysis for Sustainable Energy initiative, which is funded by the Danish Ministry of Science, Technology and Innovation. This material is also based on work funded by the Inner Nordic Energy Research Program (09-064270), the Danish Agency for Science Technology and Innovation (FTP 10-080861) and the US Department of Energy, Office of Basic Energy Science. The Center for Individual Nanoparticle Functionality is funded by the Danish National Research Foundation and the Center for Atomic-scale Materials Design is funded by the Lundbeck Foundation.
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Y.H. and P.C.K.V. fabricated the electrodes, carried out electrochemistry experiments and hydrogen measurements. C.D.D., T.P. and O.H. designed Si pillars; M.E.B. and J.R. did the DFT calculations. K.H. synthesized the Mo3S4 clusters; L.B. and A.M.S. measured XPS and analysed the data. B.L.A., S.D., J.K.N. and I.C. conceived the project, supervised the research work and discussed the results. All authors contributed to the paper writing.
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Hou, Y., Abrams, B., Vesborg, P. et al. Bioinspired molecular co-catalysts bonded to a silicon photocathode for solar hydrogen evolution. Nature Mater 10, 434–438 (2011). https://doi.org/10.1038/nmat3008
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DOI: https://doi.org/10.1038/nmat3008
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