The effect of antimony-tin and indium-tin oxide supports on the catalytic activity of Pt nanoparticles for ammonia electro-oxidation

dc.creatorSILVA, JULIO C.M.
dc.creatorPIASENTIN, RICARDO M.
dc.creatorSPINACE, ESTEVAM V.
dc.creatorNETO, ALMIR O.
dc.creatorBARANOVA, ELENA A.
dc.date2016
dc.date2017-01-20T11:36:09Z
dc.date2017-01-20T11:36:09Z
dc.date.accessioned2023-09-28T13:32:12Z
dc.date.available2023-09-28T13:32:12Z
dc.identifier0254-0584
dc.identifierhttp://repositorio.ipen.br/handle/123456789/27009
dc.identifier180
dc.identifier10.1016/j.matchemphys.2016.05.047
dc.identifier56.909
dc.identifier.urihttps://repositorioslatinoamericanos.uchile.cl/handle/2250/8997295
dc.descriptionPlatinum nanoparticles supported on carbon (Pt/C) and carbon with addition of ITO (Pt/C-ITO (In2O3)(9)center dot(SnO2)(1)) and ATO (Pt/C-ATO (SnO2)(9).(Sb2O5)(1)) oxides were prepared by sodium borohydride reduction method and used for ammonia electro-oxidation reaction (AmER) in alkaline media. The effect of the supports on the catalytic activity of Pt for AmER was investigated using electrochemical (cyclic voltammetry and chronoamperometry) and direct ammonia fuel cell (DAFC) experiments. X-ray diffraction (XRD) showed Pt peaks attributed to the face-centered cubic (fcc) structure, as well as peaks characteristic of In2O3 in ITO support and cassiterite SnO2 phase of ATO support. According to transmission electron micrographs the mean particles sizes of Pt over carbon were 5.4, 4.9 and 4.7 nm for Pt/C, Pt/C-ATO and Pt/C-ITO, respectively. Pt/C-ITO catalysts showed the highest catalytic activity for ammonia electrooxidation in both electrochemical and fuel cell experiments. We attributed this to the presence of In2O3 phase in ITO, which provides oxygenated or hydroxide species at lower potentials resulting in the removal of poisonous intermediate, i.e., atomic nitrogen (N-ads) and promotion of ammonia electrooxidation. (C) 2016 Elsevier B.V. All rights reserved.
dc.descriptionFunda????o de Amparo ?? Pesquisa do Estado de S??o Paulo (FAPESP)
dc.descriptionConselho Nacional de Desenvolvimento Cient??fico e Tecnol??gico (CNPq)
dc.descriptionFAPESP: 13/01577-0, 14/09868-6
dc.format97-103
dc.relationMaterials Chemistry and Physics
dc.rightsopenAccess
dc.subjectammonia
dc.subjectammonia fuel cells
dc.subjectamperometry
dc.subjectantimony
dc.subjectantimony oxides
dc.subjectcarbon
dc.subjectelectrochemistry
dc.subjectfcc lattices
dc.subjecthydroxides
dc.subjectindium
dc.subjectindium oxides
dc.subjectnanoparticles
dc.subjectnanostructures
dc.subjectoxidation
dc.subjectparticle size
dc.subjectplatinum
dc.subjecttin
dc.subjecttin oxides
dc.subjectvoltametry
dc.subjectx-ray diffraction
dc.titleThe effect of antimony-tin and indium-tin oxide supports on the catalytic activity of Pt nanoparticles for ammonia electro-oxidation
dc.typeArtigo de peri??dico
dc.coverageI


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