LUCIANA APARECIDA FARIAS

LUCIANA APARECIDA FARIAS

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Electro-oxidation do etanol sobre eletrocatalisadores PtSn/C e PtSnNi/C preparados utilizando borohidreto como agente redutor e acido citrico como agente estabilizante
2008 - PIASENTIN, RICARDO M.; BRANDALISE, MICHELE; TUSI, MARCELO M.; FARIAS, LUCIANA A.; LINARDI, MARCELO; SPINACE, ESTEVAM V.; OLIVEIRA NETO, ALMIR
Os eletrocatalisadores PtSn/C e PtSnNi/C foram preparados em diferentes composições atômicas utilizando borohidreto como agente redutor e ácido cítrico como agente estabilizante. Para a preparação dos eletrocatalisadores foram utilizados H2PtCl6.6H2O, NiCl2.6H2O e SnCl2.2H2O como fonte de metais e Carbono Vulcan XC72 como suporte. Os eletrocatalisadores foram caracterizados por difração de raios X e voltametria cíclica. A eletro-oxidação do etanol foi estudada por voltametria cíclica e cronoamperometria utilizando o eletrodo de camada fina porosa. Os difratogramas de raios X dos eletrocatalisadores PtSn/C e PtSnNi/C preparados pelo método da redução via borohidreto mostraram a estrutura cúbica de faces centradas da platina e suas ligas. O eletrocatalisador PtSn/C (90:10) apresentou melhor desempenho para a eletrooxidação do etanol a temperatura ambiente que os eletrocatalisadores PtSnNi/C (80:10:10), PtSnNi/C (50:40:10) e PtSn/C (50:50).
Eletro-oxidacao de etanol sobre eletrocatalisadores PtRu/C e PtRuBi/C preparados pelo metodo da reducao via borohidreto
2009 - BRANDALISE, MICHELE; FARIAS, LUCIANA A.; TUSI, MARCELO M.; CORREA, OLANDIR V.; CRISAFULLI, RUDY; LINARDI, MARCELO; SPINACE, ESTEVAM; OLIVEIRA NETO, ALMIR
Preparacao e caracterizacao de PtRu/C e PtRuBi/C pelo metodo da reducao via borohidreto de sodio para a eletro-oxidacao do etanol
2009 - BRANDALISE, MICHELE; FARIAS, LUCIANA A.; TUSI, MARCELO M.; CORREA, OLANDIR V.; CRISAFULLI, RUDY; LINARDI, MARCELO; SPINACE, ESTEVAM V.; OLIVEIRA NETO, ALMIR
Preparation of PtSn/C and PtSnNi/C electrocatalysts using the alcohol-reduction process
2008 - SPINACE, ESTEVAM V.; FARIAS, LUCIANA A.; LINARDI, MARCELO; OLIVEIRA NETO, ALMIR
PtSn/C electrocatalyst with Pt:Sn molar ratio of 50:50 and PtSnNi/C electrocatalyst with a Pt:Sn:Ni molar ratio of 50:40:10 were prepared by the alcohol-reduction process using ethylene glycol as solvent and reducing agent. The electrocatalysts were characterized by EDX, XRD, TEM and cyclic voltammetry. The electro-oxidation of ethylene glycol was studied by cyclic voltammetry and chronoamperometry using the thin porous coating technique. PtSnNi/C electrocatalyst showed a superior performance compared to PtSn/C electrocatalysts in the potential range of interest for direct ethylene glycol fuel cell.
Enhanced electro-oxidation of ethanol using PtSn/CeOsub(2)-C electrocatalyst prepared by an alcohol-reduction process
2008 - OLIVEIRA NETO, ALMIR; FARIAS, LUCIANA A.; DIAS, RICARDO R.; BRANDALISE, MICHELE; LINARDI, MARCELO; SPINACE, ESTEVAM V.
PtSn/CeO2–C electrocatalysts were prepared by an alcohol-reduction process using ethylene glycol as solvent and reduction agent and CeO2 and Vulcan Carbon XC72 as supports. The electrocatalysts were characterized by EDX and XRD. The electro-oxidation of ethanol was studied at room temperature by chronoamperometry. PtSn/CeO2–C electrocatalyst with 15 wt% of CeO2 showed a significant increase of performance for ethanol oxidation compared to PtSn/C catalyst. Preliminary tests at 100 °C on a single cell of a direct ethanol fuel cell (DEFC) also confirm the results obtained by chronoamperometry.
Electro-oxidation of ethanol using PtRuBi/C electrocatalyst prepared by borohydride reduction
2009 - BRANDALISE, M.; VERJULIO SILVA, R.W.R.; TUSI, M.M.; CORREA, O.V.; FARIAS, L.A.; LINARDI, M.; SPINACE, E.V.; OLIVEIRA NETO, A.
Pt/C, PtRu/C, PtBi/C, and PtRuBi/C electrocatalysts (20 wt.% metal loading) were prepared by borohydride reduction using H2PtCl6·6H2O, RuCl3·xH2O, and Bi(NO3)3·5H2O as metal sources and Vulcan XC 72 as support. The electrocatalysts were characterized by energy-dispersive X-ray analysis, X-ray diffraction, and thermogravimetric analysis. The electro-oxidation of ethanol was studied in sulfuric acid solution by cyclic voltammetry and chronoamperometry. The electrochemical studies showed that PtRuBi/C (50:40:10) electrocatalyst has superior performance for ethanol electro-oxidation at room temperature compared to the other electrocatalysts. Preliminary tests at 100 °C on a single direct ethanol fuel cell also confirm the results obtained by electrochemical techniques.