The catalytic activity of Pt:Ru nanoparticles for ethylene glycol and ethanol electrooxidation in a direct alcohol fuel cell
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2019
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Electrocatalysis
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In this study, we investigated the carbon-supported PtRu nanoparticles with atomic ratios of Pt:Ru of 100:0, 90:10, 70:30, and 50:50
for ethanol and ethylene glycol electrooxidation in alkaline media. The nanoparticles were synthesized using sodium borohydride
method with 20 wt% of metals loading on carbon. The nanoparticle mean sizes were 7.3 nm, 5.7 nm, 5.2 nm, and 5.1 nm for Pt/C,
Pt90Ru10/C, Pt70Ru30/C, and Pt50Ru50/C, respectively. X-ray diffraction (XRD) analysis revealed that Pt and PtRu electrocatalysts
have face-centered cubic (fcc) structure and suggests the alloy formation for all PtRu/C materials, which was further supported by
the X-ray photoelectron spectroscopy (XPS). Based on XPS analysis, Pt50Ru50/C has higher amount of Pt oxides on the surface
than Pt70Ru30/C. Electrochemical results demonstrated that the addition of Ru to Pt enhances the catalytic activity towards ethanol
and ethylene glycol electrooxidadion. The catalyst of Pt50Ru50/C composition showed the lowest onset potential for ethanol and
ethylene glycol electrooxidation, which were 160 and 70 mV lower than for Pt/C, respectively. Furthermore, this catalyst
outperformed Pt/C and other PtRu/C compositions in chronoamperometric and direct alcohol fuel cell (DAFC) experiments.
DAFC experiments using Pt50Ru50/C as anode had the power density 40 and 14% higher than using Pt/C for ethanol and ethylene
glycol, respectively. The promotion is due to the bi-functional mechanism and/or electronic effect of two metals in the alloy.
Como referenciar
SILVA, JULIO C.M.; NTAIS, SPYRIDON; RAJARAMAN, VISHWANATHAN; TEIXEIRA-NETO, ERICO; TEIXEIRA-NETO, ANGELA A.; NETO, ALMIR O.; ANTONIASSI, RODOLFO M.; SPINACE, ESTEVAM V.; BARANOVA, ELENA A. The catalytic activity of Pt:Ru nanoparticles for ethylene glycol and ethanol electrooxidation in a direct alcohol fuel cell. Electrocatalysis, v. 10, n. 3, p. 203-213, 2019. DOI: 10.1007/s12678-019-00515-8. Disponível em: http://repositorio.ipen.br/handle/123456789/30038. Acesso em: 19 Apr 2024.
Esta referência é gerada automaticamente de acordo com as normas do estilo IPEN/SP (ABNT NBR 6023) e recomenda-se uma verificação final e ajustes caso necessário.