Author:
De Araújo Rocha Thairo,Linares José J.,González Ernesto R.
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 Nb2O5 (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 co-reduction 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 PtNb2O5 (crystalline)/C compared to the other catalysts. Furthermore, a large efficiency for ethanol oxidation was obtained for this platinum-niobium catalyst.
Publisher
The Electrochemical Society
Cited by
1 articles.
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