PtSnIr/C Anode Electrocatalysts: Promoting Effect in Direct Ethanol Fuel Cells

This study investigates the promoting effect of PtSnIr/C (1:1:1) electrocatalyst anode, prepared by polymeric precursor method, on the ethanol oxidation reaction in a direct ethanol fuel cell (DEFC). All of the materials used were 20% metal m/m on carbon. X-ray photoelectron spectroscopy (XPS) analysis showed the presence of Pt, PtOH2, PtO2, SnO2 and IrO2 at the electrocatalyst surface, indicating a possible decorated particle structure. X-ray diffractometry (XRD) analysis indicated metallic Pt and Ir as well as the formation of an alloy with Sn. Using the PtSnIr/C electrocatalyst prepared here with two times lower loading of Pt than PtSn/C E-tek electrocatalyst, it was possible to obtain the same maximum power density found for the commercial material. The main reaction product was acetic acid probably due to the presence of oxides, in this point the bifunctional mechanism is predominant, but an electronic effect should not be discarded.

Brazilian Funding Institution Conselho Nacional de Desenvolvimento Cientifico e Tecnologico (CNPq)

Brazilian Funding Institution Conselho Nacional de Desenvolvimento Cientifico e Tecnologico (CNPq) [474732/2008-8]

Brazilian Funding Institution Coordenacao de Aperfeicoamento de Pessoal de Nivel Superior (CAPES)

Brazilian Funding Institution Coordenacao de Aperfeicoamento de Pessoal de Nivel Superior (CAPES)

Brazilian Funding Institution FAPESP

Brazilian Funding Institution FAPESP [05/59992-6, 09/09145-6, 10/07831-7, 10/16511-6]

Brazilian Funding Institution Instituto Nacional de Ciencia e Tecnologia (INCT) de Energia e Meio Ambiente [573.783/2008-0]

Brazilian Funding Institution Instituto Nacional de Ciencia e Tecnologia (INCT) de Energia e Meio Ambiente