Abstract
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 language | English (US) |
|---|---|
| Pages (from-to) | 323-330 |
| Number of pages | 8 |
| Journal | Faraday Discussions |
| Volume | 121 |
| DOIs | |
| State | Published - 2002 |
ASJC Scopus subject areas
- Physical and Theoretical Chemistry