Porous carbon thin films for electrochemical capacitors |
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| Affiliation: | 1. Laboratory of Physics, Vinča Institute of Nuclear Sciences, University of Belgrade, P.O. Box 522, 11001 Belgrade, Serbia;2. Flerov Laboratory of Nuclear Reactions, Joint Institute for Nuclear Research, Joliot-Curie Street 6, 141980 Dubna, Russia;3. Institute of Chemistry, Technology and Metallurgy, University of Belgrade, Njegoševa 12, 11001 Belgrade, Serbia;1. Serbian Academy of Sciences and Arts (SASA), Knez Mihailova 35, Belgrade 11000, Serbia;2. Institute of Tecnical Sciences of SASA, Knez Mihailova 35, Belgrade 11000, Serbia;3. ICTM-Center of Microelectronic Technologies, University of Belgrade, Njegoševa 12, Belgrade 11000, Serbia;1. Functional Polymer Membranes Group, Advanced Membranes and Porous Materials Center, King Abdullah University of Science and Technology, 23955, Thuwal, Saudi Arabia;2. Materials Science and Engineering, King Abdullah University of Science and Technology, 23955, Thuwal, Saudi Arabia;3. Core Lab, King Abdullah University of Science and Technology, 23955, Thuwal, Saudi Arabia;1. Laboratory of Environmental Engineering, University of Rome “Tor Vergata”, Via del Politecnico 1 – 00133 Rome, Italy;2. Department of Civil and Environmental Engineering, University of Rome “La Sapienza”, Via Eudossiana 18 – 00184 Rome, Italy;1. College of Mechanical and Automotive Engineering, Shanghai University of Engineering Science, Shanghai 201620, China;2. State Key Laboratory for Modification of Chemical Fibers and Polymer Materials, College of Materials Science and Engineering, Donghua University, Shanghai 201620, China;3. School of Material Engineering, Shanghai University of Engineering Science, Shanghai 201620, China |
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| Abstract: | ![]()
Activation effects on carbon films, derived from commercial aromatic polyimide films (Kapton, DuPont), in CO2 atmosphere at 1203 K on capacitance properties were studied. Two thicknesses of polyimide films were used: 7 and 25 μm. Pore formation during the activation process progresses in two steps due to the existence of a denser surface layer and a more porous core material. In the first step micropores are opening in the dense surface region of the material with average pore diameter smaller than 1 nm. During the second step, mesopores start opening, while micropore volume remains constant with the average micropore diameter of over 1 nm, producing bimodal texture. The first step finishes after 30 min for the thinner samples while for the thicker samples it finishes after 60 min of activation. As a consequence of such textural changes during activation, the thicker sample has a maximum areal capacitance of 0.35 F/cm2. The thinner sample activated for 30 min has a maximum volumetric capacitance of 220 F/cm3 and achieves a maximum gravimetric capacitance of 240 F/g when the texture becomes bimodal after 240 min of activation. These results confirm that activation of carbonized Kapton films gives promising electrode materials for supercapacitors. |
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