Journal
NATURE MATERIALS
Volume 14, Issue 12, Pages 1245-1251Publisher
NATURE PUBLISHING GROUP
DOI: 10.1038/NMAT4410
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Funding
- US Department of Energy, Office of Basic Energy Sciences, Division of Materials Sciences and Engineering [DE-FG02-09ER46664]
- NSF graduate Research Fellowship
- National Science Foundation [CHE-1362136]
- Division Of Chemistry
- Direct For Mathematical & Physical Scien [1362136] Funding Source: National Science Foundation
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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 DV 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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