Palladium and palladium-tin supported on multi wall carbon nanotubes or carbon for alkaline direct ethanol fuel cell
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2015
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Journal of Power Sources
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Pd and PdSn (Pd:Sn atomic ratios of 90:10), supported on Multi Wall Carbon Nanotubes (MWCNT) or
Carbon (C), are prepared by an electron beam irradiation reduction method. The obtained materials are
characterized by X-Ray diffraction (XRD), Energy dispersive X-ray analysis (EDX), Transmission electron
Microscopy (TEM) and Cyclic Voltammetry (CV). The activity for ethanol electro-oxidation is tested in
alkaline medium, at room temperature, using Cyclic Voltammetry and Chronoamperometry (CA) and in a
single alkaline direct ethanol fuel cell (ADEFC), in the temperature range of 60e90 C. CV analysis finds
that Pd/MWCNT and PdSn/MWCNT presents onset potentials changing to negative values and high
current values, compared to Pd/C and PdSn/C electrocatalysts. ATR-FTIR analysis, performed during the
CV, identifies acetate and acetaldehyde as principal products formed during the ethanol electrooxidation, with low conversion to CO2. In single fuel cell tests, at 85 C, using 2.0 mol L 1 ethanol in
2.0 mol L 1 KOH solutions, the electrocatalysts supported on MWCNT, also, show higher power densities,
compared to the materials supported on carbon: PdSn/MWCNT, presents the best result (36 mW cm 2
).
The results show that the use of MWCNT, instead of carbon, as support, plus the addition of small
amounts of Sn to Pd, improves the electrocatalytic activity for Ethanol Oxidation Reaction (EOR).
Como referenciar
GERALDES, ADRIANA N.; SILVA, DIONISIO F. da; SILVA, JULIO C.M. da; SA, OSVALDO A. de; SPINACE, ESTEVAM V.; OLIVEIRA NETO, ALMIR. Palladium and palladium-tin supported on multi wall carbon nanotubes or carbon for alkaline direct ethanol fuel cell. Journal of Power Sources, v. 275, p. 189-199, 2015. DOI: 10.1016/j.jpowsour.2014.11.024. Disponível em: http://repositorio.ipen.br/handle/123456789/23408. Acesso em: 10 May 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.