Dissolution and redeposition on Pt nanoparticles under electrochemical conditions
Artikel i vetenskaplig tidskrift, 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

Författare

Vladimir Zhdanov

Chalmers, Teknisk fysik, Kemisk fysik

Kompetenscentrum katalys (KCK)

Bengt Herbert Kasemo

Chalmers, Teknisk fysik, Kemisk fysik

Kompetenscentrum katalys (KCK)

Chemical Physics Letters

0009-2614 (ISSN)

Vol. 509 134-137

Ämneskategorier

Kemi

DOI

10.1016/j.cplett.2011.04.075