Preparation of PdAu/C-Sbsub(2)-SnOsub(2) electrocatalysts by borohydride reduction process for direct formic acid fuel cell
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Pd/C-Sb2O5·SnO2 and PdAu/C-Sb2O5·SnO2
electrocatalysts with different PdAu atomic ratio (90:10,
70:30, and 50:50) were prepared by borohydride reduction
method, and characterized by X-ray diffraction, transmission
electron microscopy, cyclic voltammetry, chronoamperommetry,
and performance test on direct formic acid fuel cell at 100 °C. Xray diffraction showed for Pd/C-Sb2O5·SnO2 the presence of Pd
face-centered cubic (fcc) system, while for PdAu/C-Sb2O5·SnO2
it showed the presence of Pd fcc phase, PdAu fcc alloys and a
segregated phases fcc Pd-rich and Au-rich phases. TEM micrographs and histograms for all electrocatalysts showed that the
nanoparticles where not well dispersed on the support and some
agglomerates were present. The electrochemical studies
showed that PdAu/C-Sb2O5·SnO2 (70:30) had superior performance for formic acid electro-oxidation at 25 °C compared
to others electrocatalysts prepared while PdAu/C-Sb2O5·SnO2
(90:10) showed superior performance in direct formic acidic
fuel cell at 100 °C. These results indicated that the addition of
10–30 % Au to Pd favor the electro-oxidation of formic acid.
This effect could be attributed to the synergy between the
constituents of the electrocatalyst (metallic Pd and Au,
SnO2, and Sb2O5·SnO2).
Como referenciar
NANDENHA, J.; SOUZA, R.F.B. de; ASSUMPCAO, M.H.M.T.; SPINACE, E.V.; OLIVEIRA NETO, A. Preparation of PdAu/C-Sbsub(2)-SnOsub(2) electrocatalysts by borohydride reduction process for direct formic acid fuel cell. Ionics, v. 19, p. 1207-1213, 2013. DOI: 10.1007/s11581-013-0955-5. Disponível em: http://repositorio.ipen.br/handle/123456789/8442. 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.