Galvanostatic
Mostrando 1-12 de 34 artigos, teses e dissertações.
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1. Development and Characterization of PbI2 Nanoparticles for all Solid-State Flexible Supercapacitor Purposes
The development and utilization of new energy sources has been extensively studied in the world. Here, we report the development of flexible self-supported metal-free electrodes based on non-oxidized graphene multilayer (MLG) paper containing the lead iodide nanoparticles (PbI2-NPs). The PbI2-NPs was obtained and characterized by X-ray diffraction (XDR) and
Mat. Res.. Publicado em: 20/05/2019
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2. Uso de técnicas electroquímicas para determinar la resistencia a la corrosión localizada de un acero inoxidable súper dúplex UNS S-32760
ABSTRACT Super duplex stainless steel UNS S-32760 is one of the most commonly used alloys in several industrial applications, due to its high corrosion resistance. However, this characteristic is affected when the alloy is exposed to aggressive environments. In this work, the effect of temperature on the critical potential of super duplex stainless steel was
Matéria (Rio J.). Publicado em: 20/05/2019
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3. Ag@Activated Carbon Felt Composite as Electrode for Supercapacitors and a Study of Three Different Aqueous Electrolytes
The main challenge for the development of a high efficiency supercapacitor is the electrode material. Developing electrode materials with high specific electrical capacitance and low electrical resistance enables an increase in the energy accumulated in the device. In addition, it is expected that the electrode material presents a simple procedure for prepar
Mat. Res.. Publicado em: 08/11/2018
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4. Nanoestructura de perovskita doble La2NiMnO6 obtenido por ruta de citrato para supercapacitores
ABSTRACT In this paper, the study of double perovskite La2NiMnO6 as electrode material for supercapacitors is presented. The mixed oxide was prepared by citrate precursor route (CIT). The sample was calcined for 4 hours at 800 °C. The material was characterized by PXRD, SEM and FTIR spectroscopy. Cyclic voltammetry and galvanostatic charge/discharge measure
Matéria (Rio J.). Publicado em: 19/07/2018
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5. Recubrimientos porosos de dióxido de titanio sintetizados por oxidación anódica
ABSTRACT Titanium dioxide is one of the most used materials in heterogeneous photocatalysis due to its commercial availability, low cost, chemical stability, low toxicity and high photocatalytic activity. One of the most efficient and economical methods to obtain TiO2 coatings is the plasma electrolytic oxidation. In this anodization process, a direct curren
Matéria (Rio J.). Publicado em: 19/07/2018
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6. Pseudocapacitance Properties of Co3O4 Nanoparticles Synthesized Using a Modified Sol-Gel Method
This work reports the synthesization of nanoparticles cobalt oxide (Co3O4) with no secondary phase by a modified sol-gel method and its structural morphological and electrochemical characterizations. FTIR, XRD and Raman analysis showed the formation of spinel cobalt oxide with no secondary phase. TEM images revealed that an undefined morphology with average
Mat. Res.. Publicado em: 05/02/2018
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7. Nickel-Copper Alloys Modified Electrodes: an Electrochemical Study on their Interfacial and Supercapacitive Properties
In this manuscript, we report the electrodeposition of nickel-copper alloys in a two steps methodology. Firstly, the copper electrode is oxidized to generate Cu2+ ions followed by the reduction of both Ni2+ and Cu2+. The electrodes were further cycled in KOH to convert the metallic alloy into the respective electroactive hydroxide. This methodology created a
J. Braz. Chem. Soc.. Publicado em: 2017-09
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8. Degradation of the Dye Reactive Blue 4 by Coupled Photoassisted Electrochemistry at DSA®-Type Electrode
We investigated the photoelectrochemical oxidation of the dye Reactive Blue 4 in the presence of a DSA®-type electrode of nominal composition Ti/Ru0.3Ti0.7O2 under ultraviolet radiation, aiming to enhance the degradation yields of this dye. We conducted the photoelectrocatalytic treatment under galvanostatic control, using an 80 W mercury vapor lamp as the
J. Braz. Chem. Soc.. Publicado em: 2016-05
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9. Influence of the polymeric coating thickness on the electrochemical performance of Carbon Fiber/PAni composites
Abstract Carbon fiber/polyaniline composites (CF/PAni) were synthesized at three different deposition time of 30, 60 and 90 min by oxidative polymerization. The composite materials were morphologically and physically characterized by scanning electron microscopy and by Raman spectroscopy, respectively. Their electrochemical responses were analyzed by cyclic
Polímeros. Publicado em: 2015-10
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10. Eletrodegradação de Ponceau 2R utilizando ânodos dimensionalmente estáveis e Ti/Pt
This paper reports the electrochemical degradation of the azo dye Ponceau 2R under galvanostatic electrolysis in the 1 to 200 mA cm-2 range at room temperature using dimensionally-stable anodes of oxygen (DSA-O2), chlorine (DSA-Cl2) and a titanium electrode of platinum coated with platinum oxide (Ti/Pt). The methodology applied was efficient for removing the
Quím. Nova. Publicado em: 2013
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11. Avaliação do potencial anticorrosivo de tiossemicarbazonas solubilizadas em microemulsão
In this paper, thiosemicarbazones 4-N-cinnamoyl-thiosemicarbazone (CTSC), 4-N-(2'-methoxycinnamoyl)-thiosemicarbazone (MCTSC), and 4-N-(4'-hydroxy-3'-methoxybenzoyl)- thiosemicarbazone (HMBTSC) were solubilized in an oil-in-water (O/W) microemulsion system (ME_OCS), forming systems CTSC_ME_OCS, MCTSC_ME_OCS and HMBTSC_ME_OCS. The effectiveness of these syste
Quím. Nova. Publicado em: 2013
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12. Desenvolvimento e uso do compósito de Nb2O5|Cu como revestimento aplicado por aspersão térmica sobre o aço AISI 1020 para proteção contra a corrosão pelo solo em estruturas enterradas
An Nb2O|Cu corrosion-resistant coating was developed and applied onto AISI 1020 steel substrate by Powder Flame Spray. A galvanostatic electrochemical technique was employed, with and without ohmic drop, in four different soils (two corrosively aggressive and two less aggressive). Behavior of coatings in different soils was compared using a cathodic hydrogen
Quím. Nova. Publicado em: 2012