Efficient hydrogen evolution catalysis using ternary pyrite-type cobalt phosphosulphide
Stone, Michael L.
Schmidt, J. R.
Thomas, Joseph G.
Chang, Hung Chih
Tsai, Meng Lin
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AbstractThe scalable and sustainable production of hydrogen fuel through water splitting demands efficient and robust Earth-abundant catalysts for the hydrogen evolution reaction (HER). Building on promising metal compounds with high HER catalytic activity, such as pyrite structure cobalt disulphide (CoS 2), and substituting non-metal elements to tune the hydrogen adsorption free energy could lead to further improvements in catalytic activity. Here we present a combined theoretical and experimental study to establish ternary pyrite-type cobalt phosphosulphide (CoPS) as a high-performance Earth-abundant catalyst for electrochemical and photoelectrochemical hydrogen production. Nanostructured CoPS electrodes achieved a geometrical catalytic current density of 10 mA cm at overpotentials as low as 48mV, with outstanding long-term operational stability. Integrated photocathodes of CoPS on n -p-p silicon micropyramids achieved photocurrents up to 35 mA cm at 0 V versus the reversible hydrogen electrode (RHE), onset photovoltages as high as 450 mV versus RHE, and the most efficient solar-driven hydrogen generation from Earth-abundant systems.
CitationCabán-Acevedo M, Stone ML, Schmidt JR, Thomas JG, Ding Q, et al. (2015) Efficient hydrogen evolution catalysis using ternary pyrite-type cobalt phosphosulphide. Nature Materials 14: 1245–1251. Available: http://dx.doi.org/10.1038/nmat4410.
SponsorsThis research is supported by the US Department of Energy, Office of Basic Energy Sciences, Division of Materials Sciences and Engineering, under Award DE-FG02-09ER46664. M.C.-A. thanks the NSF graduate Research Fellowship for support. J.R.S. is supported by the National Science Foundation Grant No. CHE-1362136 for the theoretical work here. H.-C.C., M.-L.T. and J.-H.H. are supported by KAUST baseline fund for design and fabrication of light-harvesting Si substrates.
PublisherNature Publishing Group
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