Effect of W on PtSn/C catalysts for ethanol electrooxidation


Autoria(s): RIBEIRO, J.; ANJOS, D. M. dos; LEGER, J. -M.; HAHN, F.; OLIVI, P.; ANDRADE, A. R. de; TREMILIOSI-FILHO, G.; KOKOH, K. B.
Contribuinte(s)

UNIVERSIDADE DE SÃO PAULO

Data(s)

19/10/2012

19/10/2012

2008

Resumo

Binary and ternary Pt-based catalysts were prepared by the Pechini-Adams modified method on carbon Vulcan XC-72, and different nominal compositions were characterized by TEM and XRD. XRD showed that the electrocatalysts consisted of the Pt displaced phase, suggesting the formation of a solid solution between the metals Pt/W and Pt/Sn. Electrochemical investigations on these different electrode materials were carried out as a function of the electrocatalyst composition, in acid medium (0.5 mol dm(-3) H2SO4) and in the presence of ethanol. The results obtained at room temperature showed that the PtSnW/C catalyst display better catalytic activity for ethanol oxidation compared to PtW/C catalyst. The reaction products (acetaldehyde, acetic acid and carbon dioxide) were analyzed by HPLC and identified by in situ infrared reflectance spectroscopy. The latter technique also allowed identification of the intermediate and adsorbed species. The presence of linearly adsorbed CO and CO2 indicated that the cleavage of the C-C bond in the ethanol substrate occurred during the oxidation process. At 90 degrees C, the Pt85Sn8W7/C catalyst gave higher current and power performances as anode material in a direct ethanol fuel cell (DEFC).

Identificador

JOURNAL OF APPLIED ELECTROCHEMISTRY, v.38, n.5, p.653-662, 2008

0021-891X

http://producao.usp.br/handle/BDPI/20760

10.1007/s10800-008-9484-8

http://dx.doi.org/10.1007/s10800-008-9484-8

Idioma(s)

eng

Publicador

SPRINGER

Relação

Journal of Applied Electrochemistry

Direitos

restrictedAccess

Copyright SPRINGER

Palavras-Chave #PtSnW nanoparticles #ethanol oxidation #binary and ternary electrocatalysts #DEFC #PT-SN ELECTROCATALYSTS #PLATINUM-BASED ANODES #FUEL-CELL #ELECTRO OXIDATION #ALLOY CATALYSTS #METHANOL #CARBON #MO #RU #ACID #Electrochemistry
Tipo

article

original article

publishedVersion