Platinum nanoparticles supported on nitrogen-doped carbon for ammonia electro-oxidation
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Materials Chemistry and Physics
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Pt nanoparticles supported on carbon (Pt/C) and nitrogen-doped carbon (Pt/NC) were prepared by an
alcohol-reduction process and used for ammonia electro-oxidation in alkaline media. Nitrogen-doped
carbons were prepared by thermal treatment of urea and Carbon Vulcan XC72 at 800 C under argon
atmosphere. The obtained materials showed the presence of face centered cubic structure of Pt and mean
particle sizes in the range of 3e3.7 nm. X-ray photoelectron spectroscopy results revealed that Pt/NC 5
(carbon prepared with 5% of urea) presents more Pt on the surface than Pt/C, and the nanoparticles are
predominantly in the metallic state. The electrocatalytic activity was investigated by cyclic voltammetry
and chronoamperometry experiments. Pt/NC materials showed a higher electrocatalytic activity for
ammonia electro-oxidation than Pt/C, whereby the material Pt/NC 5 showed the peak current density
161% higher than Pt/C. The increase of activity might be related to the high electrochemically accessible
area of Pt/NC and the improvement on the interaction with water due to the nitrogen onto the support
which could contribute to the oxidation of intermediate products from ammonia electro-oxidation.
Como referenciar
RIBEIRO, VILMARIA A.; FREITAS, ISABEL C. de; O. NETO, ALMIR; SPINACE, ESTEVAM V.; SILVA, JULIO C.M. Platinum nanoparticles supported on nitrogen-doped carbon for ammonia electro-oxidation. Materials Chemistry and Physics, v. 200, p. 354-360, 2017. DOI: 10.1016/j.matchemphys.2017.07.088. Disponível em: http://repositorio.ipen.br/handle/123456789/28526. Acesso em: 20 Mar 2026.
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.