Diffusion on a nanoparticle surface as revealed by electrochemical NMR

Y. Y. Tong, E. Oldfield, A. Wieckowski

Research output: Contribution to journalArticlepeer-review


Surface diffusion of chemisorbed CO (from MeOH electrochemisorption) on pure and Ru-modified nanoscale Pt electrocatalyst surfaces has been investigated by solid-state electrochemical NMR (EC-NMR) in the presence of supporting electrolyte. Temperature-dependent nuclear spin-spin and spin-lattice relaxation measurements enable the diffusion activation energy, E, to be deduced. It is shown that the activation energy E correlates with the steady state current for MeOH electro-oxidation. A simple two-dimensional collision theory model is proposed to explain this intriguing observation, which may provide new mechanistic insights into the promotion of CO-tolerance in Pt/Ru fuel cell catalysts.

Original languageEnglish (US)
Pages (from-to)323-330
Number of pages8
JournalFaraday Discussions
StatePublished - 2002

ASJC Scopus subject areas

  • Physical and Theoretical Chemistry


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