Activated Carbon Fiber Treated at Different Temperatures as Supercapacitor Electrodes: Electrochemical Characterization
Dalva Alves de Lima AlmeidaAndréa Boldarini CoutoMaurício Ribeiro BaldanN.G. Ferreira
Abstract
Carbon fiber (CF) produced at different heat treatment temperatures (HTT) of 1000, 1500, and 2000 ºC was activated by electrochemical and chemical oxidation pre-treatments. These treated CF samples were morphologically and electrochemically characterized by scanning electron microscopy, cyclic voltammetry, charge/discharge response at different current densities, and electrochemical impedance spectroscopy. Both activation pre-treatments improved the specific capacitance values for all samples in the three HTT studied showing their viability as electrodes for supercapacitor. Nonetheless, chemically pre-treated CF-1000 showed the best result mainly considering the charge/discharge response.
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