Direct Ethanol Fuel Cells: The influence of structural and electronic effects on Pt–Sn/C electrocatalysts

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dc.contributor.authorColmati, Flavio
dc.contributor.authorMagalhães, Monah M.
dc.contributor.authorSousa, Ruy
dc.contributor.authorCiapina, Eduardo G. [UNESP]
dc.contributor.authorGonzalez, Ernesto R.
dc.contributor.institutionUniversidade Federal de Goiás (UFG)
dc.contributor.institutionPontifícia Universidade Católica de Goiás
dc.contributor.institutionUniversidade Federal de São Carlos (UFSCar)
dc.contributor.institutionUniversidade Estadual Paulista (Unesp)
dc.contributor.institutionUniversidade de São Paulo (USP)
dc.date.accessioned2020-12-12T00:55:28Z
dc.date.available2020-12-12T00:55:28Z
dc.date.issued2019-11-05
dc.description.abstractCarbon-supported platinum-tin electrocatalysts (Pt–Sn/C) are known to be the most efficient fuel cell anode material to oxidize ethanol in the so-called Direct Ethanol Fuel Cells (DEFC). However, the platinum-tin binary system presents distinct phases depending on the amount of Sn (i.e., the Pt:Sn ratio) and on the thermal annealing temperatures, as well as the presence of oxides (e.g. SnO2) whose influence on the performance of DEFCs is not well understood. In this work, Pt–Sn catalysts presenting distinct Pt:Sn ratios were prepared, characterized and tested in a single DEFC. The combined results from DEFC tests and structural characterization techniques showed that increasing the amount of Sn dissolved into the Pt structure enhances DEFC performance but also that Sn content alone does not explain the overall behavior. Microstructural effects on the DEFC response was further investigated by performing a comprehensive study using high intensity X-ray Diffraction and in situ–X-Ray Absorption Spectroscopy provided by synchrotron light on Pt3Sn1/C samples subjected to thermal treatments in a reducing H2 atmosphere at temperatures of 100, 200, 300, 400, and 500 °C. The results showed that best DEFC performance depends on a balance between the amount of Sn dissolved in Pt, the formation of a new phase (PtSn) and also on the presence of tin oxides, yielding a material with an optimized modified 5d-band electronic structure, which was obtained with a thermal treatment at 200 °C.en
dc.description.affiliationUniversidade Federal de Goiás Instituto de Química, Avenida Esperança s/n
dc.description.affiliationPontifícia Universidade Católica de Goiás, Avenida Universitária 1440
dc.description.affiliationUniversidade Federal de São Carlos Departamento de Engenharia Química, Rod. Washington Luís, km 235
dc.description.affiliationSao Paulo State University (Unesp) School of Engineering, Av Dr. Ariberto Pereira da Cunha, 333
dc.description.affiliationUniversidade de São Paulo Instituto de Química de São Carlos C.P. 780
dc.description.affiliationUnespSao Paulo State University (Unesp) School of Engineering, Av Dr. Ariberto Pereira da Cunha, 333
dc.description.sponsorshipCoordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES)
dc.description.sponsorshipFundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP)
dc.description.sponsorshipFundação de Amparo à Pesquisa do Estado de Goiás
dc.description.sponsorshipConselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq)
dc.description.sponsorshipLaboratório Nacional de Luz Síncrotron
dc.description.sponsorshipIdFAPESP: 2009/07629-6
dc.description.sponsorshipIdFundação de Amparo à Pesquisa do Estado de Goiás: 201201270750433
dc.description.sponsorshipIdCNPq: 475609/2008-5
dc.description.sponsorshipIdCNPq: 554569/2010-8
dc.format.extent28812-28820
dc.identifierhttp://dx.doi.org/10.1016/j.ijhydene.2019.09.056
dc.identifier.citationInternational Journal of Hydrogen Energy, v. 44, n. 54, p. 28812-28820, 2019.
dc.identifier.doi10.1016/j.ijhydene.2019.09.056
dc.identifier.issn0360-3199
dc.identifier.scopus2-s2.0-85072793743
dc.identifier.urihttp://hdl.handle.net/11449/197972
dc.language.isoeng
dc.relation.ispartofInternational Journal of Hydrogen Energy
dc.sourceScopus
dc.subjectDEFC
dc.subjectDirect ethanol fuel cells
dc.subjectElectrocatalysts
dc.subjectPEMFC
dc.subjectPtSn
dc.titleDirect Ethanol Fuel Cells: The influence of structural and electronic effects on Pt–Sn/C electrocatalystsen
dc.typeArtigo

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