Oxidation of ammonia using PtRh/C electrocatalysts: fuel cell and electrochemical evaluation
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2015
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Applied Catalysis B: Environmental
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This study reports on the use of PtRh/C electrocatalysts prepared by the borohydride reduction method
with different Pt:Rh atomic ratios: (90:10, 70:30 and 50:50) which was investigated toward the ammonia
electro-oxidation considering electrochemical and also direct ammonia fuel cell (DAFC) experiments. The
DAFC experiments were conducted using different proportions of NH4OH and KOH as fuels. X-ray diffraction showed the formation of PtRh alloy while transmission electron micrographs showed the particles
sizes between 4.1 and 4.5 nm. Among the different NH4OH and KOH concentrations the combination
of 3 mol L−1 NH4OH and 3 mol L−1 KOH was the most favorable due to the higher KOH concentration,
which increased the electrolyte conductivity, thus, improving the ammonia oxidation. Moreover, among
the PtRh/C electrocatalysts the Pt:Rh ratio of 90:10 showed to be the best suited one since it showed
a power density almost 60% higher than Pt. X-ray photoelectron spectroscopy results revealed for this
catalyst that the nanoparticles contain a high proportion of metallic Pt and Rh phases, supporting the
alloy formation between Pt and Rh. The improved fuel cell efficiency can be related to the combination
of different effects: the alloy formation between Pt and Rh (electronic effect), suppressing the adsorption
strength of poisonous intermediates, and a synergic effect between Pt and Rh at this composition.
Como referenciar
ASSUMPCAO, MONICA H.M.T.; PIASENTIN, RICARDO M.; HAMMER, PETER; SOUZA, RODRIGO F.B. de; BUZZO, GUILHERME S.; SANTOS, MAURO C.; SPINACE, ESTEVAM V.; OLIVEIRA NETO, ALMIR; SILVA, JULIO C.M. da. Oxidation of ammonia using PtRh/C electrocatalysts: fuel cell and electrochemical evaluation. Applied Catalysis B: Environmental, v. 174-175, p. 136-144, 2015. DOI: 10.1016/j.apcatb.2015.02.021. Disponível em: http://repositorio.ipen.br/handle/123456789/23837. Acesso em: 21 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.