Activation of Methane on PdZn/C Electrocatalysts in an Acidic Electrolyte at Low Temperatures

Autor(es)

Nandenha, J. ^[1] ; Nagahama, I. H. F. ^{[1, 2]} ; Yamashita, J. Y. ^{[1, 2]} ; Fontes, E. H. ^[1] ; Ayoub, J. M. S. ^[1] ; de Souza, R. F. B. ^[1] ; Fonseca, F. C. ^[1] ; Neto, A. O. ^[1]

Afiliação do(s) autor(es)

^[1] CNEN SP, IPEN, Av Prof Lineu Prestes 2242, Cidade Univ, BR-05508000 Sao Paulo, SP - Brazil

^[2] FOC, Rua Brigadeiro Galva 540, BR-01151000 Sao Paulo, SP - Brazil

• Tipo de documento: Artigo Científico
• Fonte: International Journal of Electrochemical Science; v. 14, n. 12, p. 10819-10834, DEC 2019.
• Citações Web of Science: 0

Resumo

PdZn/C electrocatalysts were prepared by sodium borohydride utilized as reducing agent for activation methane in an acidic medium at room temperature and in a proton exchange membrane fuel cell (PEMFC) at 80 degrees C. The materials prepared were characterized by X-ray diffraction (XRD), transmission electron microscopy (TEM) and X-ray photoelectron spectroscopy (XPS). The diffractograms of the PdZn/C electrocatalysts showed only peaks associated with Pd face-centered cubic (fcc) structure. Cyclic voltammograms (CV) of all electrocatalysts after adsorption of methane shown an increment in current during the anodic scan, this effect was more pronounced for Pd(70)Zn(30)/C. In situ ATR-FTIR (Attenuated Total Reflectance-Fourier Transform Infrared) experiments was not observed the formation of intermediates adsorbed for PdZn/C electrocatalysts, this behavior indicated that the methane oxidation occurs by parallel mechanisms. Polarization curves at 80 degrees C in PEMFC show that Pd(90)Zn(10)/C has superior performance over the other electrocatalysts in methane oxidation. (AU)

• Processo FAPESP: 14/50279-4 - Brasil Research Centre for Gas Innovation
• Beneficiário: Julio Romano Meneghini
• Modalidade de apoio: Auxílio à Pesquisa - Programa Centros de Pesquisa em Engenharia
• Processo FAPESP: 17/11937-4 - Rota sustentável para a conversão de metano com tecnologias eletroquímicas avançadas
• Beneficiário: Fabio Coral Fonseca
• Modalidade de apoio: Auxílio à Pesquisa - Programa Centros de Pesquisa em Engenharia
• 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