"Degradation of Bimetallic Model Electrocatalysts: An In Situ X-Ray Absorption Spectroscopy Study"

Daniel Friebel: Daniel J. Miller, Dennis Nordlund, Hirohito Ogasawara, Anders Nilsson; Angewandte Chemie, 07/13/11.

Additional Authors: Daniel J. Miller, Dennis Nordlund, Hirohito Ogasawara, Anders Nilsson

Abstract:

Thumbnail image of graphical abstract

Gold support destabilizes platinum: Driven by the low surface energy of Au, a Pt fuel cell catalyst is removed from the surface of the Au support. Depending on the electrochemical potential, this removal can occur through Pt dissolution either into the Au substrate or into the electrolyte (see picture). In situ HERFD XAS measurements indicate formation of PtO2 by a dissolution–precipitation mechanism.