PtRu Nanoparticles Supported on Phosphorous-Doped Carbon as Electrocatalysts for Methanol Electro-Oxidation

Autor(es)

Pereira, Viviane Santos ; da Silva, Julio C. M. ; Oliveira Neto, Almir ; Spinace, Estevam V.

• Tipo de documento: Artigo Científico
• Fonte: ELECTROCATALYSIS; v. 8, n. 3, p. 245-251, MAY 2017.
• Citações Web of Science: 4

Resumo

P-doped carbon was prepared by thermal treatment of commercial carbon Vulcan XC72 with H3PO4 at 800 degrees C. PtRu nanoparticles were supported on carbon Vulcan XC72 (C) and on P-doped carbon (P-C) using an alcohol reduction process. The obtained materials were characterized by energy-dispersive X-ray spectroscopy, Raman spectroscopy, X-ray diffraction, transmission electron microscopy, and cyclic voltammetry. The performance of the electrocatalyst was evaluated for methanol electro-oxidation. The intensities of D-band and G-band of Raman spectra were different for P-doped carbon and carbon Vulcan XC72. X-ray diffraction of PtRu/C electrocatalyst showed that Pt face-centered cubic phase and Ru amorphous phase coexist in this material, while for PtRu/P-C electrocatalyst, it was observed the presence of PtRu alloy and Ru hexagonal close-packed phases. The use of P-doped carbon as support for PtRu nanoparticles improves the methanol electro-oxidation. This increase of activity could be attributed to a decrease of average nanoparticle sizes and/or more active Pt and Ru species resulting from metal-support interactions. (AU)

• Processo FAPESP: 14/09087-4 - Estudos sobre o uso do bioetanol em células a combustível do tipo PEMFC e SOFC
• Beneficiário: Marcelo Linardi
• Modalidade de apoio: Auxílio à Pesquisa - Temático