Electrochemical Phenomena
Mostrando 1-12 de 29 artigos, teses e dissertações.
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1. Dificuldades de ingressantes de um curso de licenciatura em química sobre conceitos da eletroquímica: um desafio para o ensino superior
The present work discusses some of the difficulties that chemistry undergraduates have with electrochemistry and possible impacts on higher education. They responded to a questionnaire about their insights and experiences regarding electrochemistry teaching, as well as their knowledge about it. The responses were categorized according to their difficulties,
Quím. Nova. Publicado em: 2021-06
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2. ANODES FOR SOFC: REVIEW OF MATERIAL SELECTION, INTERFACE AND ELECTROCHEMICAL PHENOMENA
This paper presents a comprehensive interface and electrochemical phenomena review of different anodes for SOFC. In this way, it was possible to select some mixed electronic and ionic conductor materials alternatives to the conventional anode, Ni-YSZ conductor. New materials must present a satisfactory electronic and ionic conductivity at intermediate temper
Quím. Nova. Publicado em: 2021-01
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3. MECANISMO DE EVOLUÇÃO DE HIDROGÊNIO DURANTE A CORROSÃO DA LIGA 2198-T8 EM MEIO CONTENDO CLORETO: UMA ABORDAGEM ELETROQUÍMICA
Corrosion is still one of the most serious and frequent problems in industries. The phenomena involved in the corrosion mechanism of Al-alloys may be explained by formation of galvanic cells between the metal matrix and heterogeneities, such as precipitates, intermetallic phases leading to potential differences and electrochemical reactions. In the cathodic
Quím. Nova. Publicado em: 2020-09
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4. Avaliação da susceptibilidade à corrosão de um aço inoxidável AISI 316L submetido à simulação térmica com o uso da Gleeble
RESUMO Este trabalho teve como finalidade avaliar a influência do tamanho médio dos grãos na susceptibilidade à corrosão do aço inoxidável austenítico AISI 316L, cujo material é bastante utilizado em juntas soldadas, em temperatura ambiente e em baixíssimas temperaturas (condições criogênicas) por apresentar excelente resistência à corrosão e
Matéria (Rio J.). Publicado em: 16/09/2019
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5. Antioxidant activity evaluation of dried herbal extracts: an electroanalytical approach
ABSTRACT The prevention of chronic and degenerative diseases, is a health concern deeply associated with oxidative stress. Such progressive phenomena can be avoided through exogenous antioxidant intake, which set up a reductant cascade, mopping up damaging free radicals. Medicinal herbs are commonly associated with high antioxidant potential, and hence their
Rev. bras. farmacogn.. Publicado em: 2018-06
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6. Estudo das propriedades elétricas de células eletroquímicas emissoras de luz de derivados de polifluoreno / Electric properties study of polymer light-emitting electrochemical cells based on polyfluorene derivatives
Polymer light emitting electrochemical cells, PLECs, are organic electronic devices that have attracted commercial interest because they operate at low voltage and exhibit high performance without the need of specific electrodes such as indium tin oxide (ITO), calcium and others. This feature provides low cost of fabrication and exible devices. The charge in
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 30/11/2011
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7. Estudo da corrosão localizada da liga de alumínio 7475-T761 por espectroscopia de impedância eletroquímica global e local em meio de sulfato de sódio. / Localized corrosion study of aluminum alloy 7475-T761 in sulfate medium using global and local electrochemical impedance spectroscopy.
Aluminum alloys used in the aerospace industry with structural purpose exhibit a complex microstructure due to thermal and mechanical treatments they are submitted for improving their strength. The microstructure of these alloys is characterized by the presence of a great number of intermetallic (IM) particles, the electrochemical activity of which is differ
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 20/07/2011
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8. Electrocatalysis in wastewater treatment: recent mechanism advances
Over 50 years, several scientists and industries have developed new alternatives for wastewater treatment and remediation. Recently, electrochemical technology has been largely developed mainly because of its versatility and environmental compatibility. Scientific contributions about role of the electrode material have allowed determining that the influence
Química Nova. Publicado em: 2011
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9. Locally Perturbative Multiscale Methods for Ionic Solute Transport in Clayly Soils / Modelos Multi-escala Localmente Perturbativos para o Transporte de Solutos Iônicos em Meios Porosos Argilosos
Este trabalho objetiva o desenvolvimento de modelos computacionais capazes de construir simulações numéricas mais realistas e menos custosas computacionalmente para o problema de descontaminação de solos argilosos por técnicas de eletrocinética. Resultados inovadores são obtidos aprimorando-se os modelos multi-escala desenvolvidos anteriormente por L
Publicado em: 2010
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10. 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
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11. Eletrocatálise utilizando líquidos iônicos e consumo químico de óxidos / Electrocatalysis using ionic liquids and chemical comsumption of platinum oxides
This dissertation is divided on two parts. The first one deals with fundamental electrochemistry employing an ionic liquid as supporting electrolyte and as a subject of study by itself. Phenomena like the anodic and cathodic stability of the liquid, emphasizing its degradation mechanism is presented. It is also shown a study of the electrocatalytic oxidation
Publicado em: 2009
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12. Estudos da reação de oxidação de hidrogênio na presença de CO no sistema eletrocatalítico Pt-Ru/C / Studies of the hydrogen oxidation reaction on the presence of CO for the Pt-Ru/C electrocatalytic system
This work shows results of studies regarding the effects of pH and atmosphere of the synthesis on the electrocatalytic properties of Pt/C, Ru/C and PtRu/C materials for the hydrogen oxidation reaction (HOR) in the presence of CO. The performance of these materials were compared for distinct eletrodic configurations of Pt/C + Ru/C physical mixtures, to charac
Publicado em: 2009