Investigation of PdIr/C electrocatalysts as anode on the performance of direct ammonia fuel cell
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Journal of Power Sources
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This work investigates the ammonia electro-oxidation considering electrochemical and direct ammonia
fuel cell (DAFC) experiments. The working electrodes/anodes are composed of Pd/C, PdIr/C (90:10, 70:30,
50:50, 30:70 and 10:90 atomic ratios) and Ir/C. Solutions of 1 mol L1 NH4OH and 1 mol L1 KOH were
used for electrochemical experiments while 1.0, 3.0 and 5.0 mol L1 NH4OH in 1.0 mol L1 KOH were
used in DAFC. X-ray diffraction analysis of PdIr/C electrocatalysts suggests the formation of PdIr alloy,
while transmission electron micrographs show the average particle diameters between 4.6 and 6.2 nm.
Electrochemical experiments indicate PdIr/C 30:70 as the best electrocatalyst in accordance with DAFC.
The maximum power densities obtained with PdIr/C 30:70 as anode using 5 mol L1 NH4OH and
1 mol L1 KOH at 40 C are 60% and 30% higher than the ones obtained with Pd/C and Ir/C electrocatalysts, respectively. The enhanced synergic effect in this specific composition may be assigned to an
optimal ratio of palladium sites that dehydrogenates ammonia at lower overpotential with the lower
surface coverage of Nads on iridium. Furthermore, electronic effect between palladium and iridium might
also contribute to the decrease of poisoning on catalyst surface by Nads.
Como referenciar
ASSUMPCAO, M.H.M.T.; SILVA, S.G. da; SOUZA, R.F.B. de; BUZZO, G.S.; SPINACE, E.V.; SANTOS, M.C.; NETO, A.O.; SILVA, J.C.M. Investigation of PdIr/C electrocatalysts as anode on the performance of direct ammonia fuel cell. Journal of Power Sources, v. 208, p. 129-136, 2014. DOI: 10.1016/j.jpowsour.2014.06.025. Disponível em: http://repositorio.ipen.br/handle/123456789/8977. 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.