Electrochemical Kinetics
Mostrando 13-24 de 63 artigos, teses e dissertações.
-
13. Kinetics and Product Analysis of the Electrochemical Dehalogenation of Hexachlorobenzene
A method for establishing the kinetics and products of the electrochemical degradation of hexachlorobenzene (HCB) is described. One plausible way of reducing HCB´s toxicity is through cathodic dehalogenation. The characterization of products formed during the electrochemical reduction and the reaction kinetics are both reported. Pentachlorobenzene (PCB), te
J. Braz. Chem. Soc.. Publicado em: 2015-04
-
14. Corrosion resistance of 2024 aluminum alloy coated with plasma deposited a-C:H:Si:O films
AA 2024 aluminum alloy is widely employed in aeronautic and automobilist industries. Its hardness and low density are attractive properties for such industrial areas. However, since it contains copper, it undergoes severe corrosion in aggressive media as saline or low Earth orbit environments. In this work, it was investigated the properties of films deposit
Mat. Res.. Publicado em: 2014-12
-
15. Implication of low temperature and sonication on electrocrystallization mechanism of Cu thin films: a kinetics and structural correlation
The effect of an ultrasonic environment during electrodeposition of copper on graphite at various electrolyte temperatures of 25, 20, 15, 10 and 5 °C is reported in this investigation. Resulting Cu deposits formed by potentiostatic deposition were characterized by electrochemical methods, scanning electron microscopy and atomic force microscopy. It was foun
Mat. Res.. Publicado em: 28/01/2013
-
16. Eletrodos porosos contendo TiO2 e WO3 : propriedades eletroquímicas e atividade fotocatalítica para remoção do corante Rodamina 6G e do hormônio 17 a-etinilestradiol em solução aquosa / Porous electrodes containig TiO2 and WO3 : eletroctrochemical properties and photocatalytic activity for removal of Rodhamine 6G dye and 17 alfa -ethynylestradiol
Porous films electrodes containing TiO2 and WO3 were deposited on SnO2:F (FTO) conducting glass from aqueous suspensions with TiO2 Degussa P25®, WO3 precursors and polyethylene glycol, followed by heating (450°C, 30 min). The maximum absorption was respectively observed at 390 and 480 nm for TiO2 and WO3 samples; intermediate values were obtained for the m
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 02/07/2012
-
17. Oxidação eletroquímica do herbicida tebutiuron utilizando eletrodo do tipo DSA
Tebuthiuron (TBH) is a herbicide widely used in different cultures and known for its toxic effects. Electrochemical methods are promising for removing pollutants such as pesticides. This study showed the degradation of TBH using a DSA® anode operated at current densities of 50 to 200 mA cm-2. Removal presented pseudo-first order kinetics while high-pressure
Quím. Nova. Publicado em: 2012
-
18. Degradação fotoeletroquímica do herbicida bentazona sobre eletrodos de carbono modificados por TiO2
This work involved the study of degradation of the herbicide bentazone in aqueous solution by different routes, in order to search a method that generates safe products to the environment. It was tested electrochemical polarization methods involving positive and negative potential, irradiation with UV light and deposition of TiO2 on the electrode surface, se
Química Nova. Publicado em: 2012
-
19. Usando um calorímetro isoperibólico no laboratório didático de uma forma diferente / Using an isoperibol calorimeter at didactical laboratory in a different way
Esse trabalho consiste na utilização de um calorímetro isoperibólico em laboratório didático de química no nível superior, para se estudar aspectos mais amplos de alguns processos, que não os energéticos. Como se sabe, o calorímetro é o principal instrumento da primeira lei da termodinâmica e, como tal, presta-se, normalmente, para se obter a va
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 16/07/2010
-
20. Estudo de propriedades de filmes de interferência crescidos em diferentes temperaturas sobre aços inoxidáveis / Estudo de propriedades de filmes de interferência crescidos em diferentes temperaturas sobre aços inoxidáveis
In this work, the properties of colored interference thin films grown by an electrochemical pulsed current process developed at Fundação Centro Tecnológico de Minas Gerais CETEC, using sulfochromic solution with a low chromium concentration at different temperatures were investigated. The physical, morphological and mechanical characteristics as well as w
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 17/04/2009
-
21. Eletrocatalisadores de ligas de platina dispersos em substratos de óxidos para a reação de oxidação de hidrogênio puro e na presença de CO / Electrocatalysts of platinum alloys dispersed in oxide substrates for pure hydrogen oxidation reaction and in the presence of CO
This work shows results of studies of the hydrogen oxidation reaction (HOR) pure in rotation in ultra porous layer and in the presence of CO in the fuel cell to the electrocatalysts of Pt alloy dispersed on oxide substrates such Pt/RuO 2 -C, Pt/RhO 2 -C, Pt/WO 3 -C, Pt/WC-C and pure materials, as RhO 2 /C and WC. The study of the catalytic properties of thes
Publicado em: 2009
-
22. Aplicação da teoria ac de eletrodos porosos na investigação da cinética de dispositivos eletrocatalíticos / Application of ac theory for porous electrode in the investigation in the kinetics of electrocatalytic devises
This work consists in using Electrochemical Impedance Spectroscopy (EIS) in the research of various electrocatalytic materials. The porous electrode model is a very promising approach to treat the frequency responses of Dimensionally Stable Anodes (DSA®). Once the application of the model is established, it is possible to obtain important kinetic informatio
Publicado em: 2008
-
23. Estudo da aplicação de naftaleno-diimidas para o desenvolvimento de sensores e dispositivos: eletroquimica de eletrodos modificados de carbono vítreo e compósitos com nanotubos de carbono / Study of the application of naphthalene-diimides for the development of sensors and devices: electrochemistry of carbon glassy modified electrodes and composites with carbon nanotubes
Four naphthalene-diimides (NDIs) were synthesized functionalyzed with N- alkyl-amino and N-alkyl-hydroxi groups. These NDIs were characterized by conventional spectrometric methods. The electrochemical properties of NDIs were studied through cyclic voltametry in acetonitrile and N-metyl-pyrrolidone. Typical voltammograms present two reversible redox processe
Publicado em: 2007
-
24. Reduction of molecular oxygen in aqueous solutions through modifying electrodesmethodology / Redução de oxigênio molecular em soluções aquosas através da metodologia de modificação de eletrodos
This work consisted in testing the viability of investigations into the electrochemical generation and identification of free radicals involved in advanced oxidative processes. In these studies, a technique which is rarely used for the electrochemical generation and identification of free radicals at organothiole-modified electrodes, electrochemical impedanc
Publicado em: 2007