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The Scientific World Journal
Volume 2017 (2017), Article ID 8786013, 15 pages
https://doi.org/10.1155/2017/8786013
Research Article

Electrochemical and Morphological Investigations of Ga Addition to Pt Electrocatalyst Supported on Carbon

1Departamento de Química, Centro de Ciências Exatas/UFES, Av. Fernando Ferrari, 514 Goiabeiras, 29075-910 Vitória, ES, Brazil
2Diretoria de Pós-Graduação, Instituto Federal do Espírito Santo (IFES), Av. Rio Branco, 50 Santa Lúcia, 29056-255 Vitória, ES, Brazil
3Departamento de Morfologia, Centro de Ciências da Saúde, UFES, Campus Maruípe, 29049-999 Vitória, ES, Brazil

Correspondence should be addressed to Josimar Ribeiro

Received 4 November 2016; Accepted 23 February 2017; Published 29 March 2017

Academic Editor: Mario L. Ferrari

Copyright © 2017 Giordano T. Paganoto et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Abstract

This paper is consisted in the synthesis of platinum-based electrocatalysts supported on carbon (Vulcan XC-72) and investigation of the addition of gallium in their physicochemical and electrochemical properties toward ethanol oxidation reaction (EOR). PtGa/C electrocatalysts were prepared through thermal decomposition of polymeric precursor method at a temperature of 350°C. Six different compositions were homemade: Pt50Ga50/C, Pt60Ga40/C, Pt70Ga30/C, Pt80Ga20/C, Pt90Ga10/C, and Pt100/C. These electrocatalysts were electrochemically characterized by cyclic voltammetry (CV), chronoamperometry (CA), chronopotentiometry (CP), and electrochemical impedance spectroscopy (EIS) in the presence and absence of ethanol 1.0 mol L−1. Thermogravimetric analysis (TGA), energy dispersive X-ray spectroscopy (EDX), X-ray diffraction (XRD), and transmission electron microscopy (TEM) were also carried out for a physicochemical characterization of those materials. XRD results showed the main peaks of face-centered cubic Pt. The particle sizes obtained from XRD and TEM analysis range from 7.2 nm to 12.9 nm. The CV results indicate behavior typical of Pt-based electrocatalysts in acid medium. The CV, EIS, and CA data reveal that the addition of up to 31% of gallium to the Pt highly improves catalytic activity on EOR response when compared to Pt100/C.