Dissolution and redeposition on Pt nanoparticles under electrochemical conditions
Journal article, 2011
We present a Schottky-type model describing Pt2+ dissolution and redeposition on Pt nanoparticles in polymer electrolyte fuel cells. The charge transfer is considered to occur near the surface of nanoparticles so that the potential barrier for the reaction is formed by the double-layer potential and the image interaction. With increasing electrode potential, the transfer coefficient for dissolution is found to decrease from 0.6-0.7 down to 0.3-0.4. Its dependence on the effective dielectric constant of the double layer is appreciable while the dependence on the particle size is weak. (C) 2011 Elsevier B.V. All rights reserved.
quartz-crystal microbalance
fuel-cells
platinum dissolution
degradation
catalyst
pt(111)
kinetics
dynamic mechanistic model
electrolyte
polymer electrolyte
reduction
Author
Vladimir Zhdanov
Chalmers, Applied Physics, Chemical Physics
Competence Centre for Catalysis (KCK)
Bengt Herbert Kasemo
Chalmers, Applied Physics, Chemical Physics
Competence Centre for Catalysis (KCK)
Chemical Physics Letters
0009-2614 (ISSN)
Vol. 509 4-6 134-137Subject Categories
Chemical Sciences
DOI
10.1016/j.cplett.2011.04.075