@Article{AlmeidaCoutOishFerr:2018:ChElTr,
author = "Almeida, Dalva Alves de Lima and Couto, Andrea Boldarini and
Oishi, Silvia Sizuka and Ferreira, Neiden{\^e}i Gomes",
affiliation = "{Instituto Nacional de Pesquisas Espaciais (INPE)} and {Instituto
Nacional de Pesquisas Espaciais (INPE)} and {Instituto Nacional de
Pesquisas Espaciais (INPE)} and {Instituto Nacional de Pesquisas
Espaciais (INPE)}",
title = "Chemical and electrochemical treatment effects on the morphology,
structure, and electrochemical performance of carbon fiber with
different graphitization indexes",
journal = "Journal of Solid State Electrochemistry",
year = "2018",
volume = "22",
number = "11",
pages = "3493--3505",
month = "Nov.",
keywords = "Carbon fiber, Oxidative treatment, Supercapacitor.",
abstract = "he association of capacitive charging of the double-layer and a
faradic redox reaction is desirable on carbon fiber (CF) when
oxygen functional groups or other heteroatoms are present on its
surface enhancing its capacitive properties. In this work, a
systematic study of carbon fiber produced at three different heat
treatment temperatures (HTT) of 1000, 1500, and 2000 degrees C was
performed upon two approaches: middle (chemical) and severe
(electrochemical) oxidative treatments. Morphological, structural,
and surface chemical changes were investigated by field emission
gun-scanning electron microscopy, X-ray diffraction, Raman
spectroscopy, and X-ray photoelectron spectroscopy.
Electrochemical responses were analyzed by galvanostatic
charge/discharge, electrochemical impedance spectroscopy, and
cyclic voltammetry. Raman results showed that the electrochemical
oxidation promoted structural variation on CF samples
independently of their HTT. Concerning the specific capacitance,
the results indicated that chemical treatment was more effective
for CF1000 than those for CF1500 and CF2000. This behavior may be
attributed to higher amount of oxygen on its surface as well as
its lower structural ordering. Otherwise, for CF1000, the
electrochemical treatment increased its resistivity. However, for
CF1500 and CF2000, which present higher graphitization levels and
less heteroatom contents, greater capacitance values were observed
after their electrochemical oxidative treatment.",
doi = "10.1007/s10008-018-4037-5",
url = "http://dx.doi.org/10.1007/s10008-018-4037-5",
issn = "1432-8488",
language = "en",
targetfile = "almeida-chemical.pdf",
urlaccessdate = "27 abr. 2024"
}