Preparation of PtRu/C, PtBi/C and PtRuBi/C electrocatalysts by an alcohol-reduction process for ethanol oxidation
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2008
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INTERNATIONAL CONFERENCE ON NANOSTRUCTURED MATERIALS, 9th
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Fuel cells employing alcohols directly (direct alcohol fuel cell, DAFC) are attractive as power
sources for mobile, stationary and portable applications. Compared to hydrogen-fed fuel cells,
which need a reforming system or have problems of hydrogen storage, DAFCs use a liquid
fuel, thus simplifying the fuel delivery system [1]. Ethanol offers an attractive alternative as
the direct fuel because it is produced in large quantities from biomass and it is much less toxic
than others alcohols. Due to the low electrocatalytic activity of platinum for practical DAFC
applications, elements like ruthenium have been added to promote electroactivity. In this
aspect it is important to study new binary and ternary electrocatalysts for ethanol oxidation
[1,2]. In this work Pt/C, PtRu/C (90:10), PtRu/C (50:50), PtBi/C (90:10), PtBi/C (50:50),
PtRuBi/C (80:10:10) and PtRuBi/C (50:40:10) were prepared by an alcohol-reduction process
[1] with metal loading of 20 wt.% using H2PtCl6.6H2O (Aldrich), RuCl3.xH2O (Aldrich),and
Bi(NO3)3.5H2O (Aldrich) as metals sources and Vulcan XC 72 as support. The
electrocatalysts were characterized by EDAX, X-ray diffraction (XRD) and cyclic
voltammetry (CV). The electro-oxidation of ethanol was studied in acid medium by cyclic
voltammetry and chronoamperometry using thin porous coating technique. The X-ray
diffractograms of Pt/C, PtRu/C, PtBi/C and PtRuBi/C electrocatalysts showed a broad peak at
about 2θ = 25° that was associated with the carbon support and four diffraction peaks at about
2θ = 40°, 47°, 67° and 82° characteristic of the face centered cubic structure (fcc) structure of
platinum and platinum alloys. For PtBi/C (50:50) electrocatalyst it was also observed the
presence of the bismuth oxide phase (Bi2O3). The Pt:Ru, Pt:Bi and Pt:Ru:Bi atomic ratios
(EDAX) of the obtained electrocalysts were similar to the nominal atomic ratios used in the
preparations and the average crystallite size were in the range of 2–4 nm. The electrochemical
studies showed that PtRuBi/C (80:10:10) electrocatalyst had superior performance for ethanol
electro-oxidation at room temperature compared to PtRu/C and PtBi/C electrocatalys.
Como referenciar
BRANDALISE, M.; TUSI, M.M.; LINARDI, M.; SPINACE, E.V.; OLIVEIRA NETO, A. Preparation of PtRu/C, PtBi/C and PtRuBi/C electrocatalysts by an alcohol-reduction process for ethanol oxidation. In: INTERNATIONAL CONFERENCE ON NANOSTRUCTURED MATERIALS, 9th, June 1-6, 2008, Rio de Janeiro, RJ. Abstract... Disponível em: http://repositorio.ipen.br/handle/123456789/19278. Acesso em: 27 Mar 2026.
Esta referência é gerada automaticamente de acordo com as normas do estilo IPEN/SP (ABNT NBR 6023) e recomenda-se uma verificação final e ajustes caso necessário.