@PhDThesis{Siqueli:2022:AnPrOx,
author = "Siqueli, Aline Castilho Rodrigues",
title = "An{\'a}lise dos processos de oxida{\c{c}}{\~a}o t{\'e}rmica e
carboniza{\c{c}}{\~a}o de feltros de fibra de carbono de PAN
t{\^e}xtil e sua influ{\^e}ncia na performance dos eletrodos de
supercapacitor",
school = "Instituto Nacional de Pesquisas Espaciais (INPE)",
year = "2022",
address = "S{\~a}o Jos{\'e} dos Campos",
month = "2021-12-03",
keywords = "oxida{\c{c}}{\~a}o t{\'e}rmica, carboniza{\c{c}}{\~a}o,
qu{\'{\i}}mica de superf{\'{\i}}cie, supercapacitor,
propriedades eletroqu{\'{\i}}micas, thermal oxidation,
carbonization, chemical surface, supercapacitor, electrochemical
properties.",
abstract = "Fibra de carbono {\'e} um termo gen{\'e}rico utilizado para
designar materiais fibrilares constitu{\'{\i}}dos essencialmente
de carbono que pode ser produzida, em princ{\'{\i}}pio, a partir
de qualquer material filamentar com alto teor de carbono fixo. O
precursor inicialmente utilizado para o desenvolvimento da
tecnologia de produ{\c{c}}{\~a}o de Fibras de Carbono foi a
fibra Rayon, por{\'e}m atualmente 90% das fibras produzidas em
n{\'{\i}}vel internacional s{\~a}o a partir da
poliacrilonitrila (PAN) precursora. J{\'a} a mat{\'e}ria prima
de fibras de carbono de PAN t{\^e}xtil {\'e} de origem n{\~a}o
precursora, por{\'e}m torna o material barato e com grandes
possibilidades de aplica{\c{c}}{\~a}o. Quando ativadas possuem
alto teor de microporos (> 600 m² g-1), s{\~a}o
autossustent{\'a}veis e de elevada cin{\'e}tica de
absor{\c{c}}{\~a}o. As fibras de carbono (FC) t{\^e}m sido
muito estudadas nos {\'u}ltimos anos, com aplica{\c{c}}{\~a}o
principalmente estruturais, j{\'a} as fibras de carbono de origem
t{\^e}xtil ainda n{\~a}o s{\~a}o t{\~a}o estudadas, mas
possuem grande potencial de aplica{\c{c}}{\~a}o como eletrodos
de supercapacitor. Neste trabalho, para entender a
qu{\'{\i}}mica e a f{\'{\i}}sica de superf{\'{\i}}cie da
fibra de carbono de PAN t{\^e}xtil para produ{\c{c}}{\~a}o de
eletrodos de alta efici{\^e}ncia para supercapacitores, foi
realizada uma minuciosa caracteriza{\c{c}}{\~a}o tanto em fibras
de carbono quanto em fibras de carbono ativadas. Inicialmente, foi
realizada a convers{\~a}o de feltros de fibra PAN t{\^e}xtil
oxidadas em feltros de fibra de carbono por diferentes rotas, com
altera{\c{c}}{\~o}es nas condi{\c{c}}{\~o}es de processamento,
desde o feltro oxidado at{\'e} o carbonizado, gerando tipos
diferentes de amostras para FC. Ap{\'o}s diversas an{\'a}lises
em rela{\c{c}}{\~a}o as suas caracter{\'{\i}}sticas
morfol{\'o}gicas e de qu{\'{\i}}mica superficial, bem como sua
aplica{\c{c}}{\~a}o como eletrodo de supercapacitor, foi
realizado um estudo parecido da FCA com diferentes tempos de
oxida{\c{c}}{\~a}o. Desta forma foi poss{\'{\i}}vel
identificar que o tempo ideal de oxida{\c{c}}{\~a}o t{\'e}rmica
{\'e} 140 min e as melhores temperaturas de
carboniza{\c{c}}{\~a}o foram 800 e 900 °C, para a
fabrica{\c{c}}{\~a}o de eletrodos de supercapacitor com melhor
desempenho. A amostra com melhor desempenho eletroqu{\'{\i}}mico
foi a FCA140 com 230 F g-1, com somente 177 m2 g-1 de {\'a}rea
espec{\'{\i}}fica superficial, provavelmente devido aos grupos
nitrogenados presentes na estrutura de carbono. ABSTRACT: Carbon
fiber is a generic term used to designate fibrillar materials
consisting essentially of carbon that can be produced, in
principle, from any filament material with a high fixed carbon
content. The precursor initially used for the development of the
carbon fiber production technology was the Rayon fiber, but
currently 90% of the fibers produced internationally are from
polyacrylonitrile (PAN). On the other hand, the carbon fiber
precursor from textile PAN is of less noble origin, but it makes
the material cheap and with great application possibilities. When
activated, the carbon fibers have a high content of micropores (>
600 m² g-1) are self-sustaining and have high adsorption kinetics.
Carbon fibers (CF) have been extensively studied in recent years,
with mainly structural applications, while carbon fibers of
textile origin are not so studied yet, but it has great potential
for application as supercapacitor electrodes. In this work, to
understand the chemistry and surface physics of carbon fiber from
textile PAN to produce high-efficiency electrodes for
supercapacitors, a detailed characterization was carried out in
both, carbon fibers and activated carbon fibers. Initially, the
conversion of oxidized PAN textile fiber felts into carbon fiber
felts was performed by different routes, with changes in
processing conditions, from oxidized to carbonized felt,
generating different types of samples for CF. After several
analyzes regarding its morphological and surface chemistry
characteristics, as well as its application as a supercapacitor
electrode, a similar study of FCA with different oxidation times
was carried out. Thus, it was possible to identify that the ideal
thermal oxidation time is 140 min and the best carbonization
temperatures were 800 and 900 °C, for the manufacture of
supercapacitor electrodes with better performance. The sample with
the best electrochemical performance was FCA140 with 230 F g-1,
with only 177 m2 g-1 of superficial area, probably due to the
nitrogenous groups present in the carbon structure.",
committee = "Baldan, Mauricio Ribeiro (presidente/orientador), and Marcuzzo,
Jossano Saldanha (orientador) and Oliveira, Isaias de and Labat,
Gisele Aparecida Amaral and Matsushima, Jorge Tadao and Contini,
Rita de Cassia Mendon{\c{c}}a Sales",
englishtitle = "Analysis of thermal oxidation and carbonization processes of
textile PAN carbon fiber felts and their influence on the
performance of supercapacitor electrodes",
language = "pt",
pages = "100",
ibi = "8JMKD3MGP3W34T/45T4M3E",
url = "http://urlib.net/ibi/8JMKD3MGP3W34T/45T4M3E",
targetfile = "publicacao.pdf",
urlaccessdate = "09 maio 2024"
}