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(Reference retrieved automatically from Web of Science through information on FAPESP grant and its corresponding number as mentioned in the publication by the authors.)

PtAg/MnOx/C as a promising electrocatalyst for glycerol electro-oxidation in alkaline medium

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Author(s):
Garcia, Amanda C. ; Ferreira, Eduardo B. ; Silva de Barros, Vanine V. ; Linares, Jose J. ; Tremiliosi-Filho, Germano
Total Authors: 5
Document type: Journal article
Source: JOURNAL OF ELECTROANALYTICAL CHEMISTRY; v. 793, n. SI, p. 188-196, MAY 15 2017.
Web of Science Citations: 9
Abstract

This study shows the positive effect that Ag possesses on Pt in order to promote the glycerol electro-oxidation in alkaline medium and how this effect can be boosted with an appropriate catalyst support, such as MnOx/C. The addition of Ag to the catalyst formulation firstly impacts on the structural and electronic features of the bimetallic PtAg/C catalyst. The diffractograms evidence the formation of a PtAg nanometric alloy, which alters the electronic environment of Pt as evidenced by the reduction of the Pt L-III white line hump in the XANES spectrum. This effect is intensified at high potential in the PtAg/MnOx/C catalyst, indicative of the low affinity of Pt to form surface PtOx species, leading to a Pt surface in which the intermediates formed are less strongly adsorbed. Moreover, MnOx can act as a source of oxygenated species required by the glycerol electro-oxidation reaction (GEOR), leading to an optimum catalytic surface. Such combination of factors leads to a very electroactive material for glycerol electro-oxidation as demonstrated by the cyclic voltammetry, chronoamperometric curves and in the actual fuel cell, in addition to a different product distribution characterised by in-situ electrochemical Fourier transform infrared spectroscopy (EC-FTIR). (C) 2016 Published by Elsevier B.V. (AU)

FAPESP's process: 12/10856-7 - Investigation of the mechanism of glycerol electro-oxidation on metallic nanoparticles
Grantee:Amanda Cristina Garcia
Support type: Scholarships in Brazil - Post-Doctorate
FAPESP's process: 12/05627-9 - Synthesis of gold nanoparticles using glycerol as reducing agent in alkaline medium: study of the variables of synthesis and application for the ethanol oxidation.
Grantee:Eduardo de Barros Ferreira
Support type: Scholarships in Brazil - Scientific Initiation
FAPESP's process: 13/16930-7 - Electrocatalysis V: electrocatalytic processes of chemical and electrical energy interconversion
Grantee:Edson Antonio Ticianelli
Support type: Research Projects - Thematic Grants