Electrochemical and fuel cell evaluation of PtAu/C electrocatalysts for ethanol electro-oxidation in alkaline media
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International Journal of Hydrogen Energy
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PtAu/C electrocatalysts in different atomic ratios and supported on Vulcan XC 72 carbon
were tested for ethanol electro-oxidation in alkaline media. The electrocatalysts were
prepared using borohydride as reducing agent. PtAu/C X-ray diffraction (XRD) patterns
showed peaks characteristic of Pt face-centered cubic (fcc) structure and carbon. PtAu/C
(70:30) and (50:50) XRD patterns showed a shift to lower values of 2q when compared to Pt/
C, this way suggesting the formation of PtAu alloy. Transmission electron micrographs
showed the nanoparticles with particle size between 4 and 6.5 nm for all PtAu/C electrocatalysts. Electrochemical characterization of the PtAu/C materials suggested the PtAu/C
(50:50) as the most promising material for ethanol electro-oxidation while experiments in
single fuel cell suggested PtAu/C (70:30). The discrepancy in the results obtained can be
explained by the electrode construction since PtAu/C (50:50) yields a much thicker electrode than PtAu/C (70:30), due to the Pt load is the same. The best results obtained with
PtAu/C electrocatalysts could be explained by the presence of Pt and Au in close contact
(alloy) associated to the extend in the platinum lattice parameters since these properties
could contribute to the CeC breaking bond.
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SILVA, SIRLANE G. da; SILVA, JULIO C.M.; BUZZO, GUILHERME S.; SOUZA, RODRIGO F.B. de; SPINACE, ESTEVAM V.; OLIVEIRA NETO, ALMIR; ASSUMPCAO, MONICA H.M.T. Electrochemical and fuel cell evaluation of PtAu/C electrocatalysts for ethanol electro-oxidation in alkaline media. International Journal of Hydrogen Energy, v. 39, n. 19, p. 10121-10127, 2014. DOI: 10.1016/j.ijhydene.2014.04.169. Disponível em: http://repositorio.ipen.br/handle/123456789/8972. Acesso em: 30 Dec 2025.
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.