RIBEIRO, VILMARIA A.FREITAS, ISABEL C. deO. NETO, ALMIRSPINACE, ESTEVAM V.SILVA, JULIO C.M.2018-02-212018-02-212017RIBEIRO, 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. <b>Materials Chemistry and Physics</b>, v. 200, p. 354-360, 2017. DOI: <a href="https://dx.doi.org/10.1016/j.matchemphys.2017.07.088">10.1016/j.matchemphys.2017.07.088</a>. Disponível em: http://repositorio.ipen.br/handle/123456789/28526.0254-0584http://repositorio.ipen.br/handle/123456789/28526Pt 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.354-360openAccessnanoparticlesplatinumcarbonnitrogen additionsdoped materialsammoniaoxidationArtigo de periódico20010.1016/j.matchemphys.2017.07.088https://orcid.org/0000-0002-7011-8261https://orcid.org/0000-0002-9287-607155.61