Improved electrocatalytic stability in ethanol oxidation by microwave-assisted selective deposition of SnO2 and Pt onto carbon
authors Russo, PA; Ahn, M; Sung, YE; Pinna, N
nationality International
journal RSC ADVANCES
keywords NONAQUEOUS SYNTHESIS; BENZYL ALCOHOL; FUEL-CELLS; OXIDE NANOPARTICLES; ACIDIC MEDIA; ELECTROOXIDATION; CATALYSTS; METHANOL; COMPOSITES; NANOTUBES
abstract Pt/SnO2/C nanostructures with SnO2/Pt molar ratios ranging from 2.5 to 0.6 were synthesized by simple and fast microwave-assisted routes. The materials are composed of 3-5 nm SnO2 and Pt nanoparticles dispersed on the carbon support, with the morphology of the coating depending on the SnO2/Pt ratio: a homogenous layer of nanoparticles coating the carbon surface is obtained for SnO2/Pt of 2.5, whereas small Pt-SnO2 clusters are formed for lower ratios. The electrocatalytic activity of the composites on the ethanol oxidation reaction (EOR) was studied by cyclic voltammetry and chronoamperometry. All the binary catalysts exhibited lower onset potentials for the EOR and slower decay of the current density with time than a commercial Pt/C catalyst. However, improved peak current densities were only observed for the composites with ratios 1.6, 1.0 and 0.6, indicating that the formation of metal and metal oxide nanoparticles clusters is favorable for the EOR. This morphology facilitates the hydroxyl groups transfer from the metal oxide to the platinum at low potentials and also the electron transfer between carbon and platinum. The best overall performance was found for the catalyst with SnO2/Pt = 1, on which the number of three-phase boundaries is maximized. Moreover, the catalyst with SnO2/Pt = 1 continued to exhibit significantly better catalytic performance on the EOR than the commercial catalyst after potential cycling.
publisher ROYAL SOC CHEMISTRY
issn 2046-2069
year published 2013
volume 3
issue 19
beginning page 7001
ending page 7008
digital object identifier (doi) 10.1039/c3ra40427g
web of science category Chemistry, Multidisciplinary
subject category Chemistry
unique article identifier WOS:000317929800044
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journal analysis (jcr 2017):
journal impact factor 2.936
5 year journal impact factor 3.096
category normalized journal impact factor percentile 58.772
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