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      Efficient hydrogen evolution catalysis using ternary pyrite-type cobalt phosphosulphide

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          Abstract

          The 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 (CoS2), 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(-2) at overpotentials as low as 48 mV, with outstanding long-term operational stability. Integrated photocathodes of CoPS on n(+)-p-p(+) silicon micropyramids achieved photocurrents up to 35 mA cm(-2) 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.

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          Most cited references 47

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                Author and article information

                Journal
                Nature Materials
                Nature Mater
                Springer Science and Business Media LLC
                1476-1122
                1476-4660
                December 2015
                September 14 2015
                December 2015
                : 14
                : 12
                : 1245-1251
                10.1038/nmat4410
                26366849
                © 2015

                http://www.springer.com/tdm

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