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Chemically controlled surface compositions of Ag–Pt octahedral catalysts

Published online by Cambridge University Press:  23 March 2017

Yung-Tin Pan ,
Lingqing Yan  and
Hong Yang
Yung-Tin Pan
Affiliation:
Department of Chemical and Biomolecular Engineering, University of Illinois at Urbana-Champaign, 206 Roger Adam Laboratory, MC-712, 600 South Mathews Avenue, Urbana, IL 61801, USA
Lingqing Yan
Affiliation:
Department of Chemical and Biomolecular Engineering, University of Illinois at Urbana-Champaign, 206 Roger Adam Laboratory, MC-712, 600 South Mathews Avenue, Urbana, IL 61801, USA
Hong Yang*
Affiliation:
Department of Chemical and Biomolecular Engineering, University of Illinois at Urbana-Champaign, 206 Roger Adam Laboratory, MC-712, 600 South Mathews Avenue, Urbana, IL 61801, USA
*
Address all correspondence to Hong Yang at hy66@illinois.edu
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Abstract

A hydrothermal method was developed to synthesize Ag–Pt nanoparticles with controlled surface composition where formaldehyde (HCHO) was utilized as a directing agent. Transmission electron microscopy and powder x-ray diffraction characterizations showed no change in bulk composition and phases as well as the size and morphology of as-made bimetallic nanocrystals. X-ray photoelectron spectroscopy study revealed, however, the enrichment of Pt on the surface as the amount of HCHO used increased. This chemically driven change in surface composition represents a nontraditional approach in the control of synthesis of bimetallic nanoparticle catalysts. A close relationship between catalytic performance and surface composition of these Ag–Pt nanocrystals was observed for electrochemical oxidation of formic acid.

Type
Research Letters
Information
MRS Communications , Volume 7 , Issue 2 , June 2017 , pp. 179 - 182
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Copyright
Copyright © Materials Research Society 2017 

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