Methanol oxidation in alkaline medium using PtIn/C electrocatalysts
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2016
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Electrocatalysis
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Pt/C and PtIn/C with atomic ratios of 90:10, 70:30,
and 50:50 were investigated for methanol electro-oxidation in
alkaline media by using cyclic voltammetry (CV),
chronoamperometry (CA), and direct methanol alkaline fuel
cell (DMAFC). All electrocatalysts were synthesized using
sodium borohydride method with 20 wt% of metals loading
on carbon. X-ray diffraction (XRD) analysis revealed that
bimetallic PtIn had faced centered cubic structure and, also,
confirmed alloy formation for PtIn/C nanoparticles.
Transmission electron micrographs showed metal nanoparticles
with average particle size between 3.0 and 5.0 nm; however,
the particle size increases when the In content was increased
in PtIn/C. In the CV experiments, the onset potential
of methanol electro-oxidation shifted to lower values as the
indium content increased. Chronoamperometry experiments
and direct methanol alkaline fuel cell suggested PtIn/C
(70:30) as the most promising material for methanol electrooxidation:
this result could be explained by the presence of Pt
and In in close contact (electronic effect) as the occurrence of
oxy-hydroxy interactions.
Como referenciar
SANTOS, M.C.L.; OTTONI, C.A.; SOUZA, R.F.B. de; SILVA, S.G. da; ASSUMPÇAO, M.H.M.T.; SPINACE, E.V.; NETO, A.O. Methanol oxidation in alkaline medium using PtIn/C electrocatalysts. Electrocatalysis, v. 7, n. 6, p. 445-450, 2016. DOI: 10.1007/s12678-016-0324-z. Disponível em: http://repositorio.ipen.br/handle/123456789/27003. Acesso em: 15 May 2024.
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