Journal
JOURNAL OF PHYSICAL CHEMISTRY C
Volume 119, Issue 24, Pages 13481-13487Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acs.jpcc.5b03284
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Funding
- Office of Naval Research [N00014-12-1-0887]
- ZAP Energy Systems
- NSF [EPS-1004083]
- DOE Office of Science by Argonne National Laboratory [DE-AC02-06CH11357]
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High-surface-area ruthenium-based RuxMy (M = Pt or Pd) alloy catalysts supported on carbon black were synthesized to investigate the hydrogen oxidation reaction (HOR) in alkaline electrolytes. The exchange current density for hydrogen oxidation on a Pt-rich Ru0.20Pt0.80 catalyst is 1.42 mA/cm(2), nearly 3 times that of Pt (0.490 mA/cm(2)). Furthermore, RuxPty alloy surfaces in 0.1 M KOH yield a Tafel slope of similar to 30 mV/dec, in contrast with the similar to 125 mV/dec Tafel slope observed for supported Pt, signifying that hydrogen dissociative adsorption is rate-limiting rather than charge-transfer processes. Ru alloying with Pd does not result in modified kinetics. We attribute these disparate results to the interplay of bifunctional and ligand effects. The dependence of the rate-determining step on the choice of alloy element allows for tuning catalyst activity and suggests not only that a low-cost, alkaline anode catalyst is possible but also that it is tantalizingly close to reality.
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