Study of ethanol electro-oxidation in acid environment on Pt3Sn/C anode catalysts prepared by a modified polymeric precursor method under controlled synthesis conditions
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ALMIR OLIVEIRA NETO
ESTEVAM VITORIO SPINACE
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Journal of Power Sources
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A carbon-supported binary Pt3Sn catalyst has been prepared using a modified polymeric precursor method under controlled synthesis conditions. This material was characterized using X-ray diffraction (XRD), and the results indicate that 23% (of a possible 25%) of Sn is alloyed with Pt, forming a dominant Pt3Sn phase. Transmission electron microscopy (TEM) shows good dispersion of the electrocatalyst and small particle sizes (3.6nm±1nm). The polarization curves for a direct ethanol fuel cell using Pt3Sn/C as the anode demonstrated improved performance compared to that of a PtSn/C E-TEK, especially in the intrinsic resistance-controlled and mass transfer regions. This behavior is probably associated with the Pt3Sn phase. The maximum power density for the Pt3Sn/C electrocatalyst (58mWcm−2) is nearly twice that of a PtSn/C E-TEK electrocatalyst (33mWcm−2). This behavior is attributed to the presence of a mixed Pt9Sn and Pt3Sn alloy phase in the commercial catalysts.
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SOUZA, R.F.B. de; PARREIRA, L.S.; RASCIO, D.C.; SILVA, J.C.M.; TEIXEIRA NETO, E.; CALEGARO, M.L.; SPINACE, E.V.; OLIVEIRA NETO, A.; SANTOS, M.C. Study of ethanol electro-oxidation in acid environment on Pt3Sn/C anode catalysts prepared by a modified polymeric precursor method under controlled synthesis conditions. Journal of Power Sources, v. 195, n. 6, p. 1589-1593, 2010. DOI: 10.1016/j.jpowsour.2009.09.065. Disponível em: http://repositorio.ipen.br/handle/123456789/7799. Acesso em: 13 Oct 2026.
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