Ethanol electro-oxidation in an alkaline medium using Pd/C, Au/C and PdAu/C electrocatalysts prepared by electron beam irradiation

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dc.contributor.authorGERALDES, ADRIANA N.pt_BR
dc.contributor.authorSILVA, DIONISIO F. dapt_BR
dc.contributor.authorSEGURA PINO, EDDYpt_BR
dc.contributor.authorHAMMER, PETERpt_BR
dc.contributor.authorSPINACE, ESTEVAM V.pt_BR
dc.contributor.authorOLIVEIRA NETO, ALMIRpt_BR
dc.contributor.authorLINARDI, MARCELOpt_BR
dc.contributor.authorSANTOS, MAURO C. dospt_BR
dc.coverageInternacionalpt_BR
dc.date.accessioned2014-07-15T13:33:35Zpt_BR
dc.date.accessioned2014-07-30T11:48:53Z
dc.date.available2014-07-15T13:33:35Zpt_BR
dc.date.available2014-07-30T11:48:53Z
dc.date.issued2013pt_BR
dc.description.abstractCarbon-supported Pd, Au and bimetallic PdAu (Pd:Au 90:10, 50:50 and 30:70 atomic ratios) electrocatalysts were prepared using electron beamirradiation. The obtainedmaterials were characterized by energy dispersive X-ray analysis (EDX), X-ray diffraction (XRD) and transmission electron microscopy (TEM), and their catalytic activities toward ethanol electro-oxidation were evaluated in an alkaline medium using electrochemical techniques, in situ attenuated total reflectance Fourier transformed infrared spectroscopy (ATR-FTIR) analysis and a single alkaline direct ethanol fuel cell (ADEFC). EDX analyses showed that the actual Pd:Au atomic ratios were very similar to the nominal ones. X-ray diffractograms of PdAu/C electrocatalysts evidenced the presence of Pd-rich (fcc) and Au-rich (fcc) phases. TEM analysis showed a homogeneous dispersion of nanoparticles on the carbon support, with an average size in the range of 3–5 nm and broad size distributions. Cyclic voltammetry (CV) and chronoamperometry (CA) experiments revealed the superior ambient activity toward ethanol electro-oxidation of PdAu/C electrocatalysts with Pd:Au ratios of 90:10 and 50:50. In situ ATR-FTIR spectroscopy measurements have shown thatthe mechanism for ethanol electro-oxidation is dependent on catalyst composition, leading to different reaction products, such as acetaldehyde and acetate, depending on the number of electrons transferred. Experiments on a single ADEFC were conducted between 50 and 90 ◦C, and the best performance of 44 mWcm−2 in 2.0 mol L−1 ethanol was obtained at 85 ◦C for the Pd:Au 90:10 catalysts. This superior performance is mostlikely associated with enhancement of ethanol adsorption on Pd, oxidation ofthe intermediates,the presence of gold oxide-hydroxyl species, low mean particle diameters and better distribution of particles on the support.
dc.format.extent455-465pt_BR
dc.identifier.citationGERALDES, ADRIANA N.; SILVA, DIONISIO F. da; SEGURA PINO, EDDY; HAMMER, PETER; SPINACE, ESTEVAM V.; OLIVEIRA NETO, ALMIR; LINARDI, MARCELO; SANTOS, MAURO C. dos. Ethanol electro-oxidation in an alkaline medium using Pd/C, Au/C and PdAu/C electrocatalysts prepared by electron beam irradiation. <b>Electrochimica Acta</b>, v. 111, p. 455-465, 2013. DOI: <a href="https://dx.doi.org/10.1016/j.electacta.2013.08.021">10.1016/j.electacta.2013.08.021</a>. Disponível em: http://repositorio.ipen.br/handle/123456789/4074.
dc.identifier.doi10.1016/j.electacta.2013.08.021
dc.identifier.issn0013-4686pt_BR
dc.identifier.orcidhttps://orcid.org/0000-0003-0105-6519
dc.identifier.orcidhttps://orcid.org/0000-0002-9287-6071
dc.identifier.orcidhttps://orcid.org/0000-0002-7011-8261
dc.identifier.urihttp://repositorio.ipen.br/handle/123456789/4074pt_BR
dc.identifier.vol111pt_BR
dc.relation.ispartofElectrochimica Actapt_BR
dc.rightsopenAccessen
dc.subjectelectrocatalystspt_BR
dc.subjectpalladiumpt_BR
dc.subjectgoldpt_BR
dc.subjectcarbonpt_BR
dc.subjectirradiationpt_BR
dc.subjectelectron beamspt_BR
dc.subjectfuel cellspt_BR
dc.subjectalkaline electrolyte fuel cellspt_BR
dc.subjectdirect ethanol fuel cellspt_BR
dc.subjectoxidationpt_BR
dc.subjectx-ray diffractionpt_BR
dc.subjecttransmission electron microscopypt_BR
dc.titleEthanol electro-oxidation in an alkaline medium using Pd/C, Au/C and PdAu/C electrocatalysts prepared by electron beam irradiationpt_BR
dc.typeArtigo de periódicopt_BR
dspace.entity.typePublication
ipen.autorPETER HAMMER
ipen.autorMARCELO LINARDI
ipen.autorMAURO C. SANTOS
ipen.autorALMIR OLIVEIRA NETO
ipen.autorESTEVAM VITORIO SPINACE
ipen.autorEDDY SEGURA PINO
ipen.autorDIONISIO FURTUNATO DA SILVA
ipen.autorADRIANA NAPOLEAO GERALDES
ipen.codigoautor10718
ipen.codigoautor279
ipen.codigoautor8452
ipen.codigoautor3541
ipen.codigoautor555
ipen.codigoautor419
ipen.codigoautor1304
ipen.codigoautor3640
ipen.contributor.ipenauthorPETER HAMMER
ipen.contributor.ipenauthorMARCELO LINARDI
ipen.contributor.ipenauthorMAURO C. SANTOS
ipen.contributor.ipenauthorALMIR OLIVEIRA NETO
ipen.contributor.ipenauthorESTEVAM VITORIO SPINACE
ipen.contributor.ipenauthorEDDY SEGURA PINO
ipen.contributor.ipenauthorDIONISIO FURTUNATO DA SILVA
ipen.contributor.ipenauthorADRIANA NAPOLEAO GERALDES
ipen.date.recebimento13-10pt_BR
ipen.identifier.fi4.086pt_BR
ipen.identifier.ipendoc19114pt_BR
ipen.identifier.iwosWoSpt_BR
ipen.identifier.ods7
ipen.range.fi3.000 - 4.499
ipen.type.genreArtigo
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sigepi.autor.atividadeGERALDES, ADRIANA N.:3640:-1:Spt_BR
sigepi.autor.atividadeSILVA, DIONISIO F. DA:1304:610:Npt_BR
sigepi.autor.atividadeSEGURA PINO, EDDY:419:220:Npt_BR
sigepi.autor.atividadeHAMMER, PETER:10718:-1:Npt_BR
sigepi.autor.atividadeSPINACE, ESTEVAM V.:555:610:Npt_BR
sigepi.autor.atividadeOLIVEIRA NETO, ALMIR:3541:610:Npt_BR
sigepi.autor.atividadeLINARDI, MARCELO:279:610:Npt_BR
sigepi.autor.atividadeSANTOS, MAURO C. DOS:8452:-1:Npt_BR
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