Journal
ENERGY & ENVIRONMENTAL SCIENCE
Volume 6, Issue 5, Pages 1509-1512Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/c3ee00045a
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Funding
- ARPA-E program of the US Department of Energy [DOE DE-AR0000009]
- US Department of Energy [DOE DE-FG02-13ER16381]
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The slow reaction kinetics of the hydrogen evolution and oxidation reactions (HER/HOR) on platinum in alkaline electrolytes hinders the development of alkaline electrolysers, solar hydrogen cells and alkaline fuel cells. A fundamental understanding of the exchange current density of the HER/HOR in alkaline media is critical for the search and design of highly active electrocatalysts. By studying the HER on a series of monometallic surfaces, we demonstrate that the HER exchange current density in alkaline solutions can be correlated with the calculated hydrogen binding energy (HBE) on the metal surfaces via a volcano type of relationship. The HER activity varies by several orders of magnitude from Pt at the peak of the plot to W and Au located on the bottom of each side of the plot, similar to the observation in acids. Such a correlation suggests that the HBE can be used as a descriptor for identifying electrocatalysts for HER/HOR in alkaline media, and that the HER exchange current density can be tuned by modifying the surface chemical properties.
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