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Degradation of Bimetallic Model Electrocatalysts: An In Situ X‐Ray Absorption Spectroscopy Study
Author(s) -
Friebel Daniel,
Miller Daniel J.,
Nordlund Dennis,
Ogasawara Hirohito,
Nilsson Anders
Publication year - 2011
Publication title -
angewandte chemie international edition
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 5.831
H-Index - 550
eISSN - 1521-3773
pISSN - 1433-7851
DOI - 10.1002/anie.201101620
Subject(s) - dissolution , bimetallic strip , x ray absorption spectroscopy , platinum , electrochemistry , in situ , materials science , substrate (aquarium) , spectroscopy , catalysis , chemical engineering , absorption spectroscopy , chemistry , electrode , nanotechnology , metal , metallurgy , physics , optics , geology , engineering , biochemistry , oceanography , organic chemistry , quantum mechanics
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 PtO 2 by a dissolution–precipitation mechanism.