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Dissolution and redeposition on Pt nanoparticles under electrochemical conditions

Vladimir P. Zhdanov (Institutionen för teknisk fysik, Kemisk fysik ; Kompetenscentrum katalys (KCK)) ; Bengt Kasemo (Institutionen för teknisk fysik, Kemisk fysik ; Kompetenscentrum katalys (KCK))
Chemical Physics Letters (0009-2614). Vol. 509 (2011), 4-6, p. 134-137.
[Artikel, refereegranskad vetenskaplig]

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.

Nyckelord: quartz-crystal microbalance, dynamic mechanistic model, electrolyte, fuel-cells, platinum dissolution, polymer electrolyte, degradation, reduction, catalyst, kinetics, pt(111)



Denna post skapades 2011-06-30. Senast ändrad 2013-02-05.
CPL Pubid: 142716

 

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Institutioner (Chalmers)

Institutionen för teknisk fysik, Kemisk fysik (1900-2015)
Kompetenscentrum katalys (KCK)

Ämnesområden

Kemi

Chalmers infrastruktur