Novo nanocompósito ternário baseado em politiofeno, óxido de grafeno reduzido e dióxido de manganês para armazenamento de energia

• Ano de defesa: 2017
• Autor(a) principal: Cremonezzi, Josué Marciano de Oliveira
• Orientador(a): Domingues, Sergio Humberto
• Banca de defesa: Fechine, Guilhermino José Macêdo , Camargo, Pedro Henrique Cury
• Tipo de documento: Dissertação
• Tipo de acesso: Acesso aberto
• Idioma: por
• Instituição de defesa: Universidade Presbiteriana Mackenzie
• Programa de Pós-Graduação: Engenharia de Materiais
• Departamento: Escola de Engenharia Mackenzie (EE)
• País: Brasil
• Palavras-chave em Português: armazenamento de energia; nanocompósito ternário; politiofeno; óxido de grafeno reduzido; dióxido de manganês
• Área do conhecimento CNPq: CNPQ::ENGENHARIAS::ENGENHARIA DE MATERIAIS E METALURGICA
• Link de acesso: http://dspace.mackenzie.br/handle/10899/26494

Supercapacitors are present in almost all kinds of electronic devices that we use in our everyday lives. Applications in systems for storing energy generated from clean sources and for powering electric cars, computers and the new self-sufficient microdevices, require, however, a new generation of capacitive materials. It is necessary to develop supercapacitors with higher capacitive density, better rate capability and that maintain the capacitance over several cycles. To address this problem, a novel approach has shown to be promising: the combination of materials of different capacitive mechanisms in ternary composites. From this strategy, it has been observed that the synergy of three materials leads to higher capacitive properties. Thus, in this work will be presented a novel ternary nanocomposite based on polythiophene, reduced graphene oxide and manganese dioxide. Both the components and the nanocomposite were obtained through simple, economical and efficient chemical routes. Adaptations in the method of obtaining the reduced graphene oxide resulted in a higher quality material. Manganese dioxide has been synthesized by an innovative route that presents advantages over the most used ones. At the end, the synergy of the three components led to singular and enhanced properties of energy storage in the nanocomposite compared to the pure polythiophene: the capacitance was 230% higher than that of the polymer with improved cyclic stability in the first 100 cycles of charge and discharge.