Diffusion on a nanoparticle surface as revealed by electrochemical NMR |
| |
Authors: | Tong Y Y Oldfield E Wieckowski A |
| |
Institution: | Department of Chemistry, Georgetown University, Washington, DC 20057, USA. |
| |
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. |
| |
Keywords: | |
本文献已被 PubMed 等数据库收录! |
|