PtNb Deposited on High Surface Area Carbon Support as Catalyst for Ethanol Electroxidation

  • De Araújo Rocha T
  • Linares J
  • González E
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Abstract

Platinum-niobium catalysts have been proposed as alternative catalysts for ethanol electro-oxidation. Catalysts prepared by a combined alcohol-sodium borohydride reduction method showed crystal sizes in the range of 3-4 nm, with large amounts of niobium oxide, as TPR results confirmed. Platinum decorated on a mixture of Nb 2O 5 (amorphous and crystalline)/Vulcan XC-72R carbon black was also prepared, with similar crystal sizes. XANES region analyses showed a certain electronic effect in the case of the coreduction of the two metals, in which a slight alloy fraction was detected. CO stripping results displayed a promising performance of the PtNb/C catalyst, with a small onset potential and a large current density for CO oxidation. Ethanol oxidation tests demonstrated a larger specific activity for the PtNb 2O 5 (crystalline)/C compared to the other catalysts. Furthermore, a large efficiency for ethanol oxidation was obtained for this platinum-niobium catalyst. © 2011 ECS - The Electrochemical Society.

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Authors

  • Thairo De Araújo Rocha

  • José J. Linares

  • Ernesto R. González

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