PtSnCe/C electrocatalysts for ethanol oxidation
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2010
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ANNUAL MEETING OF THE INTERNATIONAL SOCIETY OF ELECTROCHEMISTRY, 61st
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Resumo
The electrocatalysts for ethanol oxidation reaction (EOR) are very attractive to
the development of direct ethanol fuel cells. This alcohol is produced in large quantities
from biomass and it is much less toxic than methanol. However, its complete oxidation
remains a great challenge and the main products formed are acetaldehyde and/or acetic
acid. PtSn/C [1] and PtCe/C [2] electrocatalysts prepared by polymeric precursors
method were very active for EOR. In order to study a synergic effect of Sn and Ce with
Pt for EOR this process was investigated using PtSnCe/C electrocatalysts in different
mass ratios (72:23:5, 68:22:10, 64:21:15) prepared using the polymeric precursor
method [2], where the metal loads used were 20 % on carbon. The catalytic
performance towards ethanol oxidation for the different catalysts was evaluated by
cyclic voltammetry, chronoamperommetry, and polarization curves performed on
DEFC single cells. As a way to gain some information about the intermediates and
products of the reaction the electrooxidation of ethanol was investigated by “in situ”
FTIR spectroscopy. Among the catalysts investigated the best composition for ethanol
oxidation was 68:22:10. In this case, the current density observed by
chronoamperommetry for EOR in acidic media (H2SO4 0.5 M + Ethanol 1 M) after 30
min at E = 0.5 V, (21 mA mgPt
-1
) was 50% higher than that observed for PtSn/C E-Tek
(15 mA mgPt
-1
). During the experiments performed on single fuel cells, the
configurations used were: T = 100oC, nafion 117 membrane, with a pressurization of 2
Bar, ethanol 2 mol L-1
, and inlet ethanol flow = 2 ml min-1
. The maximum power
density for a DEFC using PtSnCe/C 68:22:10 electrocatalyst as anode was 45 mW cm-2
which is nearly 40 % bigger than PtSn/C E-TEK for the same process (32 mW cm-2
).
FTIR data show that the observed behavior may be explained by the favoring of the
acetic acid pathway, whilst CO2 show a low level of formation for all the catalysts.
Como referenciar
SOUZA, R.F.B. de; PARREIRA, L.S.; TEIXEIRA NETO, E.; CALEGARO, M.L.; GIZ, M.J.; CAMARA, G.A.; OLIVEIRA NETO, A.; SANTOS, M.C. PtSnCe/C electrocatalysts for ethanol oxidation: DEFC and FTIR 'in-situ' studies. In: ANNUAL MEETING OF THE INTERNATIONAL SOCIETY OF ELECTROCHEMISTRY, 61st, September 26 - October 1, 2010, Nice, France. Abstract... p. 117. Disponível em: http://repositorio.ipen.br/handle/123456789/21152. Acesso em: 30 Dec 2025.
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.