Voltammetry And Catalytic Reaction
Mostrando 1-12 de 12 artigos, teses e dissertações.
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1. Enhanced Catalytic Performance of Strontium-Doped Lanthanum Manganites by the Presence of Molybdenum Oxides for Electro-Reduction of Hydrogen Peroxide
In this work, two catalysts, lanthanum manganite strontium-doped perovskite without (LSM) and with (LSMMO) mixed molybdenum oxides, were synthesized by the sol-gel route and deposited by immersion in carbon cloth substrates. Their performance as cathodes in the hydrogen peroxide reduction reaction (HPRR) and oxygen reduction reaction (ORR) was investigated t
Journal of the Brazilian Chemical Society. Publicado em: 2022
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2. Facile One-Step Electrodeposition Fabrication of Amorphous MoS2 Catalysts in Titanium for Hydrogen Evolution Reaction
Hydrogen is seen as a future energy carrier that will assist the global energy fuel demand. However, it is still necessary to study efficient and inexpensive catalysts that can be used on a large scale to make this technology practical. In this paper the electrodeposition of molybdenum disulfide (MoS2) film on titanium (Ti) substrate was performed by cyclic
J. Braz. Chem. Soc.. Publicado em: 21/10/2019
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3. Iridium-Based Catalysts for the Ethanol Electrooxidation in Acidic Media
Herein we sinthesize and investigate Ir-based nanocatalysts (dispersed in carbon) in different atomic compositions combining two (IrRh) and three metals (IrRhSn). These materials were evaluated towards the ethanol electrooxidation in acidic electrolyte in presence of three ethanol concentrations using cyclic voltammetry, while the species produced during the
J. Braz. Chem. Soc.. Publicado em: 21/10/2019
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4. Evaluating the Electrochemical Characteristics of Babassu Coconut Mesocarp Ethanol Produced to Be Used in Fuel Cells
The aim of the present study is to assess the potential of ethanol deriving from the mesocarp of babassu coconut to be used in fuel cells. Babassu ethanol was generated through hydrolysis and fermentation processes. The Pt, PtRh and PtRu electrodes were prepared in carbon Vulcan XC72R through the reduction method and applied as electrocatalysts in ethanol ox
J. Braz. Chem. Soc.. Publicado em: 2018-08
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5. Efecto electrocatalítico de nanopartículas bimetálicas de Ag y Cd hacia la reducción de iones nitrato y/o nitrito
ABSTRACT The electrocatalytic effect of Cd-Ag bimetallic nanoparticles supported on highly oriented pyrolytic graphite (HOPG) and vitreous carbon (VC) substrates was evaluated for the nitrate and/or nitrite ions reduction reaction. For this, in a first stage, the metallic and bimetallic deposits were obtained on the carbonaceous substrates (CS) using the ele
Matéria (Rio J.). Publicado em: 19/07/2018
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6. Ethylene Glycol Electro-Oxidation on Platinum-Free Surfaces: How the Composition of PdRuRh Surfaces Influences the Catalysis
In this work we performed electrochemical (cyclic voltammetry and chronoamperommetry) and spectroelectrochemical studies (in situ Fourier transform infrared (FTIR)) in PdRuRh electrodeposits in acidic media in presence of ethylene glycol (0.5, 1.0 and 2.0 mol L-1). The electrochemical results show that the ethylene glycol oxidation is sensitive to the compos
J. Braz. Chem. Soc.. Publicado em: 2017-06
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7. Synthesis and characterization of poly(S-2-mercaptoethyl 2-(thiophen-3-yl)ethanethioate) by electrochemical polymerization
Abstract A novel monomer of S-2-mercaptoethyl 2-(thiophen-3-yl)ethanethioate (MTE) were synthesized via esterification reaction between 2-(thiophen-3-yl)acetic and ethane-1,2-dithiol in the presence of dicyclohexyl-carbodiimide (DCC) and N,N’-dimethylpyridin-4-amine (4-DMAP) as catalytic system. The structure of monomer was characterized via MS, 1H-NMR and
Polímeros. Publicado em: 2015-10
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8. ESTUDO DA REAÇÃO DE REDUÇÃO DE OXIGÊNIO SOBRE ELETRODOS À BASE DE TETRAMETÓXIFENILPORFIRINAS PARA APLICAÇÕES EM CÉLULAS A COMBUSTÍVEL DE BOROIDRETO DIRETO / STUDY OF THE OXYGEN REDUCTION REACTION ON ELECTRODES BASED OF TETRAMETÓXIFENILPORFIRINAS FOR APPLICATIONS IN CELLS FUEL BOROHYDRIDE DIRECT
The oxygen reduction reaction (ORR) in 1.0 mol/L KOH solutions catalyzed by FeTMPP/C and CoTMPP/C was investigated in absence and presence of BH4- anions with concentrations varying from 10-7 to 1.0 mol/L. Similar cyclic voltammetry and rotating disk electrode experiments have been also performed the commercial E-TEK Pt/C electrocatalysts. In absence of BH4-
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 10/06/2012
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9. Dinâmica oscilatória na eletrooxidação de etileno glicol / Oscillatory dynamics in the ethylene glycol electrooxidation reaction
In the present work were studied some nonlinear aspects of the catalytic oxidation of ethylene glycol (EG) on platinum electrodes in alkaline media (KOH). The systems dynamics was investigated by means of cyclic voltammetry, current and potential time series, and electrochemical impedance spectroscopy (EIS). The EIS results reveal the presence of a hidden ne
Publicado em: 2008
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10. Comportamento eletroquímico de nitrofuranos em eletrodos de diamante dopado com boro-modelo para o mecanismo de ação de nitrocompostos com atividades antichagásica / Electrochemical behaviour of nitrofurans on highly boron doped diamond Electrodes-model for the action mechanism of the nitrocompounds with antichagasic activity
The electrochemical behaviour of nitrofural (NFZ) at carbon paste, glassy carbon and highly boron doped diamond (HBDD) electrodes was studied in Britton- Robinson (BR) buffer using cyclic voltammetry. The best results were obtained at HBDD electrodes, in which it was possible to stabilize the radical anion (R-NO2•‾) in predominantly aqueous mediu
Publicado em: 2007
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11. Graphite Functionalized in Conditions of Friedel-Crafts Reaction mediated by Radiation of Microwave: New Material for Construction of Electrodes of Carbon Paste / Grafite funcionalizada em condições de Friedel-Crafts mediada por radiação de microondas: novo material para construção de eletrodos de pasta de carbono
Modification and/or functionalization of eletrodic materials have been investigated in order to improve the application of chemically modified electrode (CME) regards on their sensitivity, selectivity and reactivity comparing with unmodified substrate. However, the stability and reproducibility of these CME are one of the most important goals to achieve main
Publicado em: 2007
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12. Estudos bioeletroquímicos e eletroanalíticos da diospirina : agente leishmanicida e antitumoral
Analysis of molecular constituents based on natural products has acquired an important perspective in view of the renewed interest in the consumption of herbal prescriptions all over the world. Natural quinonoid compounds possess significant pharmacological properties and are responsible for the bioactivities of several plants. They showed several bioactivit
Publicado em: 2006