Fuel cell and electrochemical studies of the ethanol electro-oxidation in alkaline media using PtAuIr/C as anodes

SILVA, SIRLANE G. daFONTES, ERIC H.ASSUMPÇAO, MONICA H.M.T.LINARDI, MARCELOSPINACE, ESTEVAMSILVA, JULIO C.M.OLIVEIRA NETO, ALMIR2017-07-032017-07-032017SILVA, SIRLANE G. da; FONTES, ERIC H.; ASSUMPÇAO, MONICA H.M.T.; LINARDI, MARCELO; SPINACE, ESTEVAM; SILVA, JULIO C.M.; OLIVEIRA NETO, ALMIR. Fuel cell and electrochemical studies of the ethanol electro-oxidation in alkaline media using PtAuIr/C as anodes. <b>Ionics</b>, v. 23, n. 9, p. 2367-2376, 2017. DOI: <a href="https://dx.doi.org/10.1007/s11581-017-2088-8">10.1007/s11581-017-2088-8</a>. Disponível em: http://repositorio.ipen.br/handle/123456789/27594.http://repositorio.ipen.br/handle/123456789/27594Ethanol electro-oxidation reaction was investigated considering conventional electrochemical experiments in alkaline media, direct ethanol fuel cell (DEFC), and in situ ATRFTIR. The working electrode/anodes were composed of monometallic Pt/C, Au/C, Ir/C, and trimetallic PtAuIr/C nanoparticles with atomic Pt/Au/Ir ratios of 40:50:10, 50:40:10, 60:30:10, 70:20:10, and 80:10:10. X-ray diffraction (XRD) suggests PtAuIr/C alloy formation, and according to transmission electron micrographs, the mean particle sizes are from 4 to 6 nm for all catalyst compositions. PtAuIr/C 40:50:10 showed the highest catalytic activity for ethanol electro-oxidation in the electrochemical experiments; using this material, the peak current density from ethanol electro-oxidation on cyclic voltammetry experiment was 50 mA per g of Pt, 3.5 times higher than that observed with Pt/C. The fuel cell performance was superior using all PtAuIr/C compositions than using Pt/C. Au/C and Ir/C presented very poor catalytic activity toward ethanol electro-oxidation. The improved results obtained using PtAuIr/C might be related to the OHads species formed at low overpotential on Ir and to the decrease on adsorption energy of poisoning intermediates on Pt sites, promoted by Au.2367-2376openAccesselectrocatalystsfuel cellselectrochemistryplatinumgolddirect ethanol fuel cellsFuel cell and electrochemical studies of the ethanol electro-oxidation in alkaline media using PtAuIr/C as anodesArtigo de periódico92310.1007/s11581-017-2088-8https://orcid.org/0000-0003-0105-6519https://orcid.org/0000-0002-9287-6071https://orcid.org/0000-0002-7011-826148.80