@Article{CostaRoMaBaReSa:2021:ObNaCa,
               author = "Costa, Hugo Moreira da Silva and Rodrigues, Valdinei Euzebio and 
                         Matsushima, Jorge Tadao and Baldan, Maur{\'{\i}}cio Ribeiro and 
                         Rezende, Mirabel Cerqueira and Sales, Rita de C{\'a}ssia 
                         Mendon{\c{c}}a",
          affiliation = "{Faculdade de Tecnologia de S{\~a}o Jos{\'e} dos Campos (FATEC)} 
                         and {Faculdade de Tecnologia de S{\~a}o Jos{\'e} dos Campos 
                         (FATEC)} and {Faculdade de Tecnologia de S{\~a}o Jos{\'e} dos 
                         Campos (FATEC)} and {Instituto Nacional de Pesquisas Espaciais 
                         (INPE)} and {Universidade Federal de S{\~a}o Paulo (UNIFESP)} and 
                         {Faculdade de Tecnologia de S{\~a}o Jos{\'e} dos Campos 
                         (FATEC)}",
                title = "Obten{\c{c}}{\~a}o de nanofios de carbono a partir de 
                         copol{\'{\i}}mero de PAN eletrofiados para aplica{\c{c}}{\~a}o 
                         como supercapacitores",
              journal = "Mat{\'e}ria",
                 year = "2021",
               volume = "26",
               number = "2",
                pages = "e12972",
             keywords = "Electrospinning, Carbonization, Supercapacitor, PAN copolymers.",
             abstract = "Currently, there is a demand in the search for materials with high 
                         power density, long life cycle and low environmental impact that 
                         are mostly used fot the supercapacitors production, which are 
                         considered promising energy power for electronic systems. The most 
                         promising types of materials for this application are those based 
                         on carbon, due to their flexibility, surface area and good 
                         electrochemical stability. For the production of carbonaceous 
                         materials, the main precursor used is polyacrylonitrile (PAN) and 
                         its variations from the addition of monomers, such as methyl 
                         acrylate (MA). Generally, these materials are used in forms of 
                         blankets or yarns produced from spinning processes and later 
                         carbonized to generate the carbonaceous material. One of the 
                         spinning processes that has been widely studied for obtaining 
                         carbon nanofibers is the electrospinning process. Therefore, this 
                         paper presents the results obtained from the carbonization of 
                         electrospun blankets manufactured from solutions of 
                         polyacrylonitrile homopolymer (PANH) and poly (acrylonitrile-co-6 
                         % methyl acrylate) (PAN6MA) combined with dimethylformamide in 
                         order to obtain material for use in supercapacitors. The polymers 
                         used were analyzed by DSC to obtain the values related to 
                         cyclization, by that were possible to observe a better thermal 
                         stability related to the samples of PAN6MA, with a temperature 
                         range of 240-312 degrees C and maximum temperature of the 
                         exothermic peak of 292 degrees C. The electrospun mats were 
                         oxidized at 235 degrees C per 5 min and carbonized at 90 degrees C 
                         per 5 min. Both pre-carbonization and post-carbonization mats were 
                         analyzed by SEM, showing fibers with smooth surface, randomly 
                         dispersion and nanometric size, with values of diameter of 
                         approximately 219 nm for PANH carbon nanofibers (NfcPANH) and 185 
                         nm for PAN6MA carbon nanofibers (NfcPAN6MA). The carbonized mats 
                         were analyzed by RAMAN technique and it was possible to obtain the 
                         data related to the carbon structure present in the samples, where 
                         the obtained values showed that the mats manufactured from PAN6MA 
                         presented the lower value of degree of crystallinity measured from 
                         the relationship between bands D and G known as factor I-D/I-G, 
                         the value obtained being equal to 1.06 for NfcPAN6MA and 1.24 for 
                         NfcPANH, this shows a higher concentration of crystalline 
                         graphitic structures when compared with the samples produced from 
                         PANH. To obtain the capacitive characteristic, the load/discharge 
                         curves were surveyed by chronopotentiometric analysis, where it 
                         was possible to observe the best characteristics related to the 
                         specific capacity and low current cycling stability applied to the 
                         PAN - co- 6% methyl acrylate sample with specific capacity values 
                         of 270.9 F/g, energy density of 30.0 Wh/kg and power density of 
                         153.5 W/kg. The results obtained demonstrated that the material 
                         presented potential for the proposed application.",
                  doi = "10.1590/S1517-707620210002.1272",
                  url = "http://dx.doi.org/10.1590/S1517-707620210002.1272",
                 issn = "1579-2641",
             language = "en",
           targetfile = "costa_obtencao.pdf",
        urlaccessdate = "22 maio 2024"
}