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Development of activated carbon electrodes for application in electrochemical capacitors of aqueous electrolytes

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Otávio Cristiano Vilas Boas
Total Authors: 1
Document type: Master's Dissertation
Press: Campinas, SP.
Institution: Universidade Estadual de Campinas (UNICAMP). Faculdade de Engenharia Elétrica e de Computação
Defense date:
Examining board members:
Hudson Giovani Zanin; Ambrósio Florêncio de Almeida Neto; Alfredo Carlos Peterlevitz
Advisor: Hudson Giovani Zanin

With the increasing demand for energy, one of the major problems of contemporary society is the management and storage of Electric Energy. Off-grid solar and wind systems, electric vehicles, portable technological devices, and many others could benefit from the development and subsequent lower cost of clean storage and power supply systems. In this context, rechargeable batteries have been responsible for a revolution in mobility and urban communication, however, they are still expensive, take a long time to charge and can still explode if excessively required. In addition, they are manufactured using various components that are toxic to the environment. Given these disadvantages, Electrochemical Capacitors, also known as Supercapacitors, are ideal to complement them when it is desired to carry out fast processes of storage and supply of Energy, as they work mainly through non-faradaicos or ultra-fast faradaicos processes in the electrode-solution interface, these processes being immediate and non-destructive, allowing the device to have a long life (> 300 thousand cycles). Against this background, this work had as objective to study the confection and the characterization of these devices. Electrodes were developed using activated carbon and a commercial polyester based varnish as a agglutinator material. These electrodes were used in the manufacture of electrochemical capacitors with 5 types of aqueous electrolytes, the assemblies being standardized through the use of CR2032 coin cells type that were characterized by several types of electrochemical analysis, such as galvanostatic charge-discharge, cyclic voltammetry and electrochemical impedance spectroscopy. All cells presented electrochemical stability within a voltage window of 1.1V, with emphasis on the cell containing 2M H2SO4, which obtained a gravimetric capacitance of 56.90 F/g and equivalent series resistance of 0,23"ômega". These results consolidate the electrodes developed as promising for application in Electrochemical Capacitors, thus instigating the development of new technologies that can compose the various types of energy storage and supply systems (AU)

FAPESP's process: 17/03640-1 - Development of prototype of powerful energy storer and supplier
Grantee:Otavio Cristiano Vilas Boas
Support Opportunities: Scholarships in Brazil - Master