微量の金属化合物を添加したKAPTONフィルムから調製した炭素材料のキャパシター特性

概要

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KAPTON films with and without adding small amounts of metallic compounds (0.1〜2 at% as metal) were carbonized at 800〜1200℃ for 1 h in nitrogen and capacitance was measured in sulfate solutions by cyclic voltammetry. Nitrogen containing carbons derived from the film without additives had low specific surface area (SBET < 90 m2g−1) and the capacitance (CT) was lower than 35 F g−1. The capacitance normalized by SBET (CSP), however, reached as high as 0.77 F m−2, and decreased with decreasing nitrogen content (WN), indicating pseudocapacitance due to nitrogen. The correlation between CSP and a proportion of particular nitrogen species on the surface was not observed. Except for silicone, the addition of compounds of Fe(II), Co(II), Ni(II) and Ti(IV) increased SBET:SBET increased with increasing amount of additives. The CSP value for the products at 850℃ varied depending on the additives, and the products were grouped under a) nitrogen containing carbons mainly showing pseudocapacitance due to nitrogen, b) iron containing carbons showing redox peaks, and c) carbons having relatively high SBET (around 400 m2g−1) and mainly showing the electric double layer capacitance.