Influence of Support Material of PtSnNiGa/C Electrocatalysts for Ethanol Oxidation

Ethanol is a promising alternative source for fuel cells due to its low toxicity and high power density. However, the cleavage of the C-C bond, CO poisoning, and low electrocatalyst stability are still considered crucial issues. To overcome this limitation, binary, ternary and quaternary electrocata...

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Bibliographic Details
Published in:Orbital : The Electronic Journal of Chemistry 2017-04, Vol.9 (3), p.140-150
Main Authors: Santos, Deise M, Paganoto, Giordano T, Queiroz, Maria A.R, Guimaraes, Marco C.C, Ribeiro, Josimar
Format: Article
Language:English
Subjects:
Chemical properties
Ethanol
ethanol oxidation reaction
gallium
Observations
Oxidation-reduction reactions
Platinum catalysts
proton exchange membrane fuel cells
quaternary electrocatalysts
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Summary:Ethanol is a promising alternative source for fuel cells due to its low toxicity and high power density. However, the cleavage of the C-C bond, CO poisoning, and low electrocatalyst stability are still considered crucial issues. To overcome this limitation, binary, ternary and quaternary electrocatalysts have been investigated along with new carbon supports. This paper presents a physicochemical and electrochemical investigation of quaternary PtSnNiGa/C electrocatalysts supported on Vulcan XC72 and Printex-L6 carbons and also a carbon produced by natural gas pyrolysis in an Argon plasma torch (Black Plasma). The electrochemical characterization was performed through cyclic voltammetry, chronoamperometry, chronopotentiometry and electrochemical impedance spectroscopy in the presence of ethanol 1.0 mol [L-.sup.1]. Energy dispersive X-ray spectroscopy, X-ray diffraction, Raman spectroscopy and transmission electron microscopy were also carried out for physicochemical characterization. The electrochemical results show that the quaternary electrocatalysts supported on Vulcan XC72 and Printex-L6 carbons display a high current normalized by Pt mass and are more stable than the electrocatalyst supported on Black Plasma. In addition, the quaternary electrocatalysts with reduced Pt loading display better electrocatalytic activity towards the EOR compared to high Pt loading electrocatalysts. Keywords: ethanol oxidation reaction; gallium; proton exchange membrane fuel cells; quaternary electrocatalysts
ISSN:1984-6428
1984-6428
DOI:10.17807/orbital.v9i3.949