title: In situ X-ray absorption analysis of ∼1.8 nm dendrimer-encapsulated Pt nanoparticles during electrochemical CO oxidation.
abstract: 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.
authors: Department of Chemistry and Biochemistry, Texas Materials Institute, The University of Texas at Austin, 1 University Station A5300, Austin, TX 78712-0165, USA.
authors: Michael G
authors: MG
authors: Weir
authors: V Sue
authors: VS
authors: Myers
authors: Anatoly I
authors: AI
authors: Frenkel
authors: Richard M
authors: RM
authors: Crooks
mesh_terms: D002244:Carbon / Q000737:chemistry; D002248:Carbon Monoxide / Q000737:chemistry*; D050091:Dendrimers / Q000737:chemistry; D004563:Electrochemistry; D004566:Electrodes; D053768:Metal Nanoparticles / Q000737:chemistry*; D010084:Oxidation-Reduction; D010984:Platinum / Q000737:chemistry*; D011073:Polyamines / Q000737:chemistry*; D013499:Surface Properties; D056928:X-Ray Absorption Spectroscopy
chemical_list: D050091:Dendrimers; C531249:Poly(amidoamine); D011073:Polyamines; D010984:Platinum; D002244:Carbon; D002248:Carbon Monoxide