Glycerol oxidation reaction using PdAu/C electrocatalysts

Autor(es)

Ottoni, Cristiane Angelica ^[1] ; da Silva, Sirlane G. ^[2] ; De Souza, Rodrigo F. B. ^[2] ; Oliveira Neto, Almir ^[2]

Afiliação do(s) autor(es)

^[1] Sao Paulo State Univ UNESP, Biosci Inst, Coastal Campus, BR-11330900 Sao Vicente - Brazil

^[2] IPEN CNEN SP, Inst Pesquisas Energet & Nucl, Ave Prof Lineu Prestes, 2242 Cidade Univ, BR-05508900 Sao Paulo - Brazil

• Tipo de documento: Artigo Científico
• Fonte: IONICS; v. 22, n. 7, p. 1167-1175, JUL 2016.
• Citações Web of Science: 10

Resumo

Glycerol oxidation reactions were evaluated using PdAu/C electrocatalysts under alkaline conditions. These electrocatalysts were synthesized in different ratios (100:0, 75:25, 50:50, 25:75, and 0:100), using the borohydride reduction method. The materials were characterized with X-ray diffraction (XRD), transmission electron microscopy (TEM), and electrochemical techniques associated by in situ attenuated total reflectance Fourier transformed infrared spectroscopy (ATR-FTIR). According to the XRD diffractograms, the presence of Pd and Au (face-centered cubic (fcc)) phases and Pd-Au (fcc) alloys were detected. Cyclic voltammetry assisted by ATR-FTIR in situ and chronoamperometry experiments revealed that the addition of Au remarkably enhances the electrocatalytic activity, due to the action of bifunctional effect, with addition of the interactions of alcohoxide with hydroxylate species in gold surface, and the stability of Pd/C catalysts. Highest current density (approximate to 4 mA mg(metal)(-1)) was achieved for the catalyst Pd50Au50/C and Pd75Au25/C, which is two times higher than that achieved by Pd/C (2 mA mg(metal)(-1)), demonstrating the beneficial effect of the PdAu alloy. (AU)

• Processo FAPESP: 14/09087-4 - Estudos sobre o uso do bioetanol em células a combustível do tipo PEMFC e SOFC
• Beneficiário: Marcelo Linardi
• Modalidade de apoio: Auxílio à Pesquisa - Temático