Utilize este identificador para referenciar este registo: http://hdl.handle.net/10400.9/1402
Título: Influence of catalyst support characteristics and functionalization on the catalytic activity of Pt-Ru for PEM fuel cells
Autor: Calderon, J. C.
Figueiredo, J. L.
Mahata, N.
Pereira, M. F. R.
Fernandes, Vitor R.
Rangel, C. M.
Calvillo, L.
Lázaro, M. J.
Pastor, E.
Palavras-chave: Carbon xerogels
Polymer electrolyte membrane
Ordered mesoporous carbons
Pt-Ru electrocatalysts
Fuel cells
Data: 2011
Citação: Calderon, J. C. [et. al.]. Influence of catalyst support characteristics and functionalization on the catalytic activity of Pt-Ru for PEM fuel cells. In: Ciência e Tecnologia dos Materiais, 2011, Vol. 28, nº 1-2, p. 12-20
Resumo: Pt-Ru electrocatalysts supported on carbon xerogels and ordered mesoporous carbons were synthesized by reduction with formate ions (SFM method). Chemical and heat treatments were applied to modified the surface chemistry of original carbon supports. Physical characterization of the catalysts was performed using X-ray dispersive energy (EDX) and X-ray diffraction (XRD) techniques, while the electrochemical activity towards methanol oxidation was studied by cyclic voltammetry (CV). Pt-Ru catalysts with nominal metal content (20 wt.%) and atomic ratios (Pt:Ru 1:1) were successfully synthesized on the different supports. Higher methanol oxidation current densities were obtained for those supports with a higher content of surface oxygen groups. Gas diffusion electrode and membrane-electrode-assembly preparation allowed an in-house built of a direct methanol fuel monocell for the evaluation of the catalysts performance. Polarization curves were measured confirming the results obtained in a three electrodes electrochemical cell by CV. Normalized power curves per weight of Pt are discussed in terms of the significant impact on noble metal loading and attained cell maximum power, in comparison with results obtained with a commercial catalyst.
URI: http://hdl.handle.net/10400.9/1402
Aparece nas colecções:UPCH - Artigos em revistas nacionais

Ficheiros deste registo:
Ficheiro Descrição TamanhoFormato 
J.C.Calderon.pdf475,16 kBAdobe PDFVer/Abrir

FacebookTwitterDeliciousLinkedInDiggGoogle BookmarksMySpace
Formato BibTex MendeleyEndnote Degois 

Todos os registos no repositório estão protegidos por leis de copyright, com todos os direitos reservados.