Supercapacitors based on conducting polymers/nanotubes composites |
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| Affiliation: | 1. Poznan University of Technology, 60-965 Poznan, ul. Piotrowo 3, Poland;2. CRMD, CNRS-University, 1b rue de la Férollerie, 45071 Orléans, France;1. Mondragon Unibertsitatea, Loramendi 4, 20500 Arrasate, Spain;2. CIC Energigune, Albert Einstein 48, 01510 Miñano, Spain;1. School of Physics and Technology, University of Jinan, Jinan 250022, PR China;2. State Key Laboratory of Material Processing and Die and Mould Technology, School of Materials Science and Engineering, Huazhong University of Science and Technology (HUST), Wuhan 430074, PR China;1. Department of Physics and Materials Science, City University of Hong Kong, 83 Tat Chee Avenue, Hong Kong, China;2. Wuhan National Laboratory for Optoelectronics (WNLO), and School of Physics, Huazhong University of Science and Technology (HUST), 1037 Luoyu Road, Wuhan 430074, China;3. Shenzhen Research Institute, City University of Hong Kong, Shenzhen 518000, China;1. Department of Physics, Centre for Advanced Study in Physics, Panjab University, Chandigarh, 160014, India;2. Department of Physics, Goswami Ganesh Dutta Sanatan Dharma College, Sector 32-C, Chandigarh, 160014, India;1. Key Laboratory of the Ministry of Education for Advanced Catalysis Materials, Department of Chemistry, Zhejiang Normal University, Jinhua 321004, Zhejiang, China;2. Vacuum Interconnected Nanotech Workstation, Suzhou Institute of Nano-Tech and Nano-Bionics, Chinese Academy of Sciences, Suzhou 215123, Jiangsu, China |
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| Abstract: | Three types of electrically conducting polymers (ECPs), i.e. polyaniline (PANI), polypyrrole (PPy) and poly-(3,4-ethylenedioxythiophene) (PEDOT) have been tested as supercapacitor electrode materials in the form of composites with multiwalled carbon nanotubes (CNTs). The energy storage in such a type of composite combines an electrostatic attraction as well as quick faradaic processes called pseudo-capacitance. It has been shown that carbon nanotubes play the role of a perfect backbone for a homogenous distribution of ECP in the composite. It is well known that pure conducting polymers are mechanically weak, hence, the carbon nanotubes preserve the ECP active material from mechanical changes (shrinkage and breaking) during long cycling. Apart of excellent conducting and mechanical properties, the presence of nanotubes improves also the charge transfer that enables a high charge/discharge rate. For an optimal use of ECPs in electrochemical capacitors, a special electrode composition with ca. 20 wt.% of CNTs and a careful selection of the potential range is necessary. The capacitance values ranging from 100 to 330 F g−1 could be reached for different asymmetric configurations with a capacitor voltage from 0.6 to 1.8 V. It is also noteworthy that such a type of ECP/CNTs composite does not need any binding substance that is an important practical advantage. |
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