NILDEMAR APARECIDO MESSIAS FERREIRA
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Artigo IPEN-doc 23720 Effect of Sn loading on the characteristics of Pt electrocatalysts supported on reduced graphene oxide for application as direct ethanol fuel cell anode2017 - CORDEIRO, GUILHERME L.; USSUI, VALTER; MESSIAS, NILDEMAR A.; PIASENTIN, RICARDO M.; LIMA, NELSON B. de; NETO, ALMIR O.; LAZAR, DOLORES R.R.The effect of Sn loading (5–30 mol %) on Pt catalysts supported on reduced graphene oxide was investigated for ethanol electro-oxidation in acidic medium. Reduced graphene oxide was synthesized via graphite oxidation–exfoliation process in liquid phase and chemical reduction. Pt and PtxSny catalysts were deposited on reduced graphene oxide by a NaBH4 impregnation–reduction method. The adopted procedures allowed the synthesis of graphene-like nanosheets where single Sn-doped Pt nanoparticles were impregnated. Pt lattice parameter and micro-strain increased with Sn addition, confirming the formation of a solid solution. Concerning ethanol electro-oxidation, Pt was more active when supported on reduced graphene oxide whereas the introduction of Sn enhanced the catalyst activity, leading to lower ethanol oxidation potentials and higher current densities.Artigo IPEN-doc 21512 Efeito dos parâmetros de síntese na formação de compostos nanoestruturados à base de titânia por meio de reação hidrotérmica2015 - SANTOS, ANDRE V.P. dos; YOSHITO, WALTER K.; FERREIRA, NILDEMAR A.M.; USSUI, VALTER; OLIVEIRA NETO, ALMIR; LAZAR, DOLORES R.R.