RICARDO MARCELO PIASENTIN

RICARDO MARCELO PIASENTIN

Página do item completo

Resultados de Busca

Agora exibindo 1 - 8 de 8

Effect of Sn loading on the characteristics of Pt electrocatalysts supported on reduced graphene oxide for application as direct ethanol fuel cell anode
2017 - 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.
PtBi/C electrocatalysts for formic acid electro-oxidation in acid and alkaline electrolyte
2015 - YOVANOVICH, M.; PIASENTIN, R.M.; AYOUB, J.M.S.; NANDENHA, J.; FONTES, E.H.; SOUZA, R.F.B. de; BUZZO, G.S.; SILVA, J.C.M.; SPINACE, E.V.; ASSUMPCAO, M.H.M.T.; NETO, A.O.; SILVA, S.G. da
Ethanol electro-oxidation on PtSn/C-ATO electrocatalysts
2012 - AYOUB, J.M.S.; SOUZA, R.F.B. de; SILVA, J.C.M.; PIASENTIN, R.M.; SPINACE, E.V.; SANTOS, M.C.; OLIVEIRA NETO, A.
Preparation of Pt/C-Insub(2)Osub(3).SnOsub(2) electrocatalysts by borohydride reduction process for ethanol electro-oxidation
2012 - HENRIQUE, R.S.; SOUZA, R.F.B. de; SILVA, J.C.M.; AYOUB, J.M.S.; PIASENTIN, R.M.; LINARDI, M.; SPINACE, E.V.; SANTOS, M.C.; NETO, A.O.
Electro-oxidation of ethanol of PtPdSn/C-Sbsub(2)Osub(5)-SnOsub(2) electrocatalysts prepared by borohydride reduction
2013 - PIASENTIN, R.M.; SOUZA, R.F.B. de; SILVA, J.C.M.; SPINACE, E.V.; SANTOS, M.C.; OLIVEIRA NETO, A.
Pt/C-Sb2O5.SnO2, PtPd/C-Sb2O5.SnO2 and PtPdSn/C-Sb2O5.SnO2 electrocatalysts were prepared in a single step using H2PtCl6.6H2O, Pd(NO3)2.2H2O and SnCl2.2H2O as metal sources, sodium borohydride as reducing agent and a physical mixture of 85% Vulcan Carbon XC72 and 15% Sb2O5.SnO2 (antimony tin oxide – ATO) as support. X-ray diffractograms showed that Pt-Pd-Sn(fcc) alloy, carbon and Sb2O5.SnO2 phases are present in the PtPdSn/C-Sb2O5.SnO2 electrocatalysts. Transmission electron microscopy for all electrocatalysts showed that the metal nanoparticles were homogeneously distributed over the supports with average particle sizes in the range of 3-5 nm. The electro-oxidation of ethanol was studied by cyclic voltammetry and chronoamperometry at 25oC and in a single Direct Ethanol Fuel Cell (DEFC) at 100oC. PtPdSn/C-Sb2O5.SnO2 electrocatalysts exhibited superior performance for ethanol electro-oxidation than PtPd/C-Sb2O5.SnO2 and Pt/C-Sb2O5.SnO2 electrocatalysts, respectively. In situ FTIR studies showed that acetic acid and CO2 are preferentially formed using PtPdSn/C-Sb2O5.SnO2 electrocatalysts.
PtRu/C and PtRuBi/C electrocatalysts prepared in two different ways by borohydride reduction for ethanol electro-oxidation
2010 - BRANDALISE, MICHELE; TUSI, MARCELO M.; PIASENTIN, RICARDO M.; LINARDI, MARCELO; SPINACE, ESTEVAM V.; OLIVEIRA NETO, ALMIR
Preparation of PdPtSn/C-Sbsub(2)Osub(5)-SnOsub(2) electrocatalysts by borohydride reduction for ethanol electro-oxidation in alkaline medium
2011 - PIASENTIN, RICARDO M.; SPINACE, ESTEVAM V.; TUSI, MARCELO M.; OLIVEIRA NETO, ALMIR
Synthesis of PdAu/C and PdAuBi/C electrocatalysts by borohydride reduction method for ethylene glycol electro-oxidation in alkaline medium
2012 - BRANDALISE, MICHELE; TUSI, MARCELO M.; PIASENTIN, RICARDO M.; SANTOS, MAURO C. dos; SPINACE, ESTEVAM V.; OLIVEIRA NETO, ALMIR