The effect of alkyl chain of the imidazolium ring on the poly(o-methoxyaniline)/ionic liquid supercapacitor performance
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New materials can be developed using a known compound with enhanced properties modifying and controlling its microstructure, morphology, and density of defects. In this work, a new material was produced by the addition of ionic liquid (IL) to the poly(o-methoxyaniline) (POMA) conductive polymer, in the form of esmeraldine salt. The polymer impregnated with IL was tested as an electrode for use in supercapacitors. The results show that the charge storage properties of the materials are dependent on the length of the alquil substituent of imidazolium ring of ionic liquid cation. The best results, obtained by the addition of 1-butyl-3-methylimidazolium triflate IL to the polymer, improved electrical charge storage and electrochemical stability, making the material a promising electrode for supercapacitor devices. This compound has specific capacitance of 205 F/g, five times larger than pure POMA and was stable for 3000 cycles of charge/discharge experiments carried out at 1.0 A/g.
KeywordsConducting polymers Poly(o-methoxyaniline) Supercapacitors Ionic liquids
Financial support of this research was provided by Fundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP) (Grant Nos. 2011/10897-2, 2016/05363-2, 2013/07296-2), Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES), Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq) (402287/2013-4), Sistema de Laboratórios em Nanotecnologias/Ministério da Ciência, Tecnologia e Inovação (SISNANO/MCTI), Financiadora de Estudos e Projetos (FINEP), and Embrapa AgroNano research network.
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