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Master's Dissertation
DOI
https://doi.org/10.11606/D.85.2020.tde-13122019-163855
Document
Author
Full name
Pedro Vitor Duarte da Cruz
E-mail
Institute/School/College
Knowledge Area
Date of Defense
Published
São Paulo, 2019
Supervisor
Committee
Júnior, Rubens Nunes de Faria (President)
Casini, Julio César Serafim
Mercuri, Lucildes Pita
Title in Portuguese
Efeito do tratamento térmico a vácuo e do processo HDDR nas propriedades eletroquímicas de supercapacitores à base de carbono ativado e óxido de grafeno reduzido
Keywords in Portuguese
capacitância específica
HDDR
supercapacitores eletroquímicos
Abstract in Portuguese
O aumento da necessidade de armazenamento de energia trouxe aos capacitores eletroquímicos de dupla camada elétrica (supercapacitores) maiores proporções nas pesquisas. Com isto, a principal necessidade se tornou o aumento de sua capacidade (capacitância). Visando isto, o presente trabalho busca investigar o efeito do carbono ativado, matéria prima de eletrodos para os supercapacitores, tratado termicamente vácuo em diferentes temperaturas (200, 400, 600, 800 e 1000 °C) e por meio do processo HDDR,nas alterações das características elétricas destes produtos. Foram escolhidos dois eletrólitos de baixa toxidade em duas concentrações para salientar suas diferenças, sendo sulfato de sódio (1,0 mol L-1) e hidróxido de potássio (1,0 e 6,0 mol L-1). As medidas utilizadas para esta caracterização se basearam nos ensaios de voltametria cíclica e ciclos galvanostáticos, efetuados em um analisador computadorizado, determinando a capacitância especifica e resistência interna. Foram realizados, também, ensaios utilizando as seguintes técnicas: impedância, termogravimetria, adsorção de nitrogênio, microscopia eletrônica de varredura (MEV) e difração de raios X (DRX).
Title in English
The effect of vacuum annealing and HDDR processing on the electrochemical characteristics of supercapacitors based activated carbon and graphene oxide
Keywords in English
electrochemical supercapacitors
HDDR
specific capacitance
Abstract in English
The increased need for energy storage has brought the double-layer electrochemical capacitors (supercapacitors) larger proportions in research. With this, the main necessity became the increase of its capacity (capacitance). Aiming at this, the present work seeks to investigate the effect of activated carbon, electrode raw material for supercapacitors, heat treated vacuum at different temperatures (200, 400, 600, 800 and 1000 ° C) and through the HDDR process, in the alterations. electrical characteristics of these products. Two low-toxicity electrolytes were chosen at two concentrations to highlight their differences, sodium sulfate (1.0 mol L-1) and potassium hydroxide (1.0 and 6.0 mol L-1). The measurements used for this characterization were based on the cyclic voltammetry and galvanostatic cycles tests, performed in a computerized analyzer, determining the specific capacitance and internal resistance. Tests were also performed using the following techniques: impedance, thermogravimetry, nitrogen adsorption, scanning electron microscopy (SEM) and X-ray diffraction (XRD).
 
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2019CruzEfeito.pdf (3.22 Mbytes)
Publishing Date
2020-03-12
 
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