Achieving high electrode specific capacitance with materials of low mass specific capacitance: Potentiostatically grown thick micro-nanoporous PEDOT films |
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| Institution: | 1. Department of Mechanical Engineering, Yuan Ze University, Taoyuan 320, Taiwan;2. Graduate Program in Renewable Energy, Yuan Ze University, Taoyuan 320, Taiwan;1. Department of Nano, Medical and Polymer Materials, Yeungnam University, 280 Daehak-Ro, Gyeongsan 38541, Republic of Korea;2. School of Chemical Engineering, Yeungnam University, 280 Daehak-Ro, Gyeongsan 38541, Republic of Korea;3. Nano Materials & Components Research Center, Korea Electronics Technology Institute (KETI), Seongnam 13509, Republic of Korea;1. Université de Lille, CNRS, Centrale Lille, Université Polytechnique Hauts-de-France, UMR 8520 - IEMN, F-59000 Lille, France;2. Réseau sur le Stockage Electrochimique de l''Energie (RS2E), CNRS FR 3459, 33 rue Saint Leu, 80039 Amiens Cedex, France;3. Institut des Matériaux Jean Rouxel (IMN), CNRS UMR 6502 – Université de Nantes, 2 rue de la Houssinière BP32229, 44322 Nantes cedex 3, France;4. Unité de Catalyse et de Chimie du Solide (UCCS), Université de Lille, CNRS, Centrale Lille, Université d''Artois, UMR 8181 – UCCS, F-59000 Lille, France;5. Institut Universitaire de France (IUF), France |
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| Abstract: | Electrode materials for supercapacitors are at present commonly evaluated and selected by their mass specific capacitance (CM, F g?1). However, using only this parameter may be a misleading practice because the electrode capacitance also depends on kinetics, and may not increase simply by increasing material mass. It is therefore important to complement CM by the practically accessible electrode specific capacitance (CE, F cm?2) in material selection. Poly3,4-ethylene-dioxythiophene] (PEDOT) has a mass specific capacitance lower than other common conducting polymers, e.g. polyaniline. However, as demonstrated in this communication, this polymer can be potentiostatically grown to very thick films (up to 0.5 mm) that were porous at both micro- and nanometer scales. Measured by both cyclic voltammetry and electrochemical impedance spectrometry, these thick PEDOT films exhibited electrode specific capacitance (CE, F cm?2) increasing linearly with the film deposition charge, approaching 5 F cm?2, which is currently the highest amongst all reported materials. |
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