Efficient hydrogen evolution catalysis using ternary pyrite-type cobalt phosphosulphide
Stone, Michael L.
Schmidt, J. R.
Thomas, Joseph G.
Chang, Hung Chih
KAUST DepartmentComputer, Electrical and Mathematical Sciences and Engineering (CEMSE) Division
Electrical Engineering Program
KAUST Solar Center (KSC)
Permanent link to this recordhttp://hdl.handle.net/10754/622396
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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.
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