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In situ X‐ray Absorption Analysis of ∼1.8 nm Dendrimer‐Encapsulated Pt Nanoparticles during Electrochemical CO Oxidation
Author(s) -
Weir Michael G.,
Myers V. Sue,
Frenkel Anatoly I.,
Crooks Richard M.
Publication year - 2010
Publication title -
chemphyschem
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.016
H-Index - 140
eISSN - 1439-7641
pISSN - 1439-4235
DOI - 10.1002/cphc.201000452
Subject(s) - dendrimer , x ray absorption fine structure , nanoparticle , electrochemistry , absorption (acoustics) , in situ , materials science , electrode , chemistry , photochemistry , chemical engineering , nanotechnology , polymer chemistry , spectroscopy , organic chemistry , physics , quantum mechanics , engineering , composite material
We report an in situ X‐ray absorption‐fine structure (XAFS) spectroscopic analysis of ∼1.8 nm Pt dendrimer‐encapsulated nanoparticles (DENs) during electrocatalytic oxidation of CO. The results indicate that Pt nanoparticles encapsulated within poly(amidoamine) (PAMAM) dendrimers and immobilized on a carbon electrode retain their electrocatalytic activity and are structurally stable for extended periods during CO oxidation. This is a significant finding, because nanoparticles in this size range are good experimental models for comparison to first‐principles calculations if they remain stable.