Efficient hydrogen evolution catalysis using ternary pyrite-type cobalt phosphosulphide

Miguel Cabán-Acevedo, Michael L. Stone, J. R. Schmidt, Joseph G. Thomas, Qi Ding, Hung Chih Chang, Meng-Lin Tsai, Jr-Hau He, Song Jin

Research output: Contribution to journalArticlepeer-review

799 Scopus citations

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 (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.
Original languageEnglish (US)
Pages (from-to)1245-1251
Number of pages7
JournalNature Materials
Volume14
Issue number12
DOIs
StatePublished - Sep 14 2015

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