Journal
PHYSICAL CHEMISTRY CHEMICAL PHYSICS
Volume 17, Issue 6, Pages 4047-4053Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/c4cp04358h
Keywords
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Funding
- ANR [2011 CHEX 004 01]
- French network METSA - CNRS
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Reduced size and direct electrochemical H-2 compression are two distinct advantages of electrolyzers based on the acid-polymer electrolyte membrane technology over those relying on alkaline electrolytes. However, recourse to catalysts based on the scarce platinum-group-metals has hitherto been the price to pay. While the transition metal sulfides and nitrides of group VI have recently shown interesting activities for H-2 evolution, the remaining activity gap with Pt needs to be reduced. Platinum owes its high activity to its optimum metal-hydrogen bond strength for H-2 evolution, which is a proven descriptor of the activity on single-component catalysts. Here, we unravel a major synergetic effect between gold and molybdenum nitride which multiplies the hydrogen evolution activity ca. 100 times over that of either gold or molybdenum nitride. This two-phase catalytic material, featuring both strong and weak metal-hydrogen bonds, overcomes the limitations described by Sabatier's principle for single-component catalysts.
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