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Citation: A. O. Neto, J. Nandenha, R. F. B. De Souza, G. S Buzzo, J. C. M. Silva, E. Ü. Spinacé, M. H. M. T. Assumpção. Anodic oxidation of formic acid on PdAuIr/C-Sb2O5·SnO2 electrocatalysts prepared by borohydride reduction[J]. Journal of Fuel Chemistry and Technology, ;2014, 42(7): 851-857. shu

Anodic oxidation of formic acid on PdAuIr/C-Sb2O5·SnO2 electrocatalysts prepared by borohydride reduction

  • 1.

    Instituto de Pesquisas Energéticas e Nucleares-IPEN-CNEN/SP, Cidade Universitária, São Paulo 05508-900, Brazil

  • Received Date: 6 December 2013
    Available Online: 17 April 2014

  • PdAuIr/C-Sb2O5·SnO2 electrocatalysts with Pd:Au:Ir molar ratios of 90:5:5, 70:20:10 and 50:45:5 were prepared by borohydride reduction method. These electrocatalysts were characterized by EDX, X-ray diffraction, transmission electron microscopy and the catalytic activity toward formic acid electro-oxidation in acid medium investigated by cyclic voltammetry (CV), chroamperometry (CA) and tests on direct formic acid fuel cell (DFAFC) at 100℃. X-ray diffractograms of PdAuIr/C-Sb2O5·SnO2 electrocatalysts showed the presence of Pd fcc phase, Pd-Au fcc alloys, carbon and ATO phases, while Ir phases were not observed. TEM micrographs and histograms indicated that the nanoparticles were not well dispersed on the support and some agglomerates. The cyclic voltammetry and chroamperometry studies showed that PdAuIr/C-Sb2O5·SnO2 (50:45:5) had superior performance toward formic acid electro-oxidation at 25℃ compared to PdAuIr/C-Sb2O5·SnO2 (70:20:10), PdAuIr/C-Sb2O5·SnO2 (90:5:5) and Pd/C-Sb2O5·SnO2 electrocatalysts. The experiments in a single DFAFC also showed that all PdAuIr/C-Sb2O5·SnO2 electrocatalysts exhibited higher performance for formic acid oxidation in comparison with Pd/C-Sb2O5·SnO2 electrocatalysts, however PdAuIr/C-Sb2O5·SnO2 (90:5:5) had superior performance. These results indicated that the addition of Au and Ir to Pd favor the electro-oxidation of formic acid, which could be attributed to the bifunctional mechanism (the presence of ATO, Au and Ir oxides species) associated to the electronic effect (Pd-Au fcc alloys).
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