Electrochemical behaviour of poly(3,4-ethylenedioxythiophene) in a room-temperature ionic liquid |
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| Affiliation: | 1. State Key Laboratory of Pollution Control and Resource Reuse, Key Laboratory of Yangtze River Water Environment, Ministry of Education, College of Environmental Science and Engineering, Tongji University, Shanghai 200092, PR China;2. College of Biological, Chemical Sciences and Engineering, Jiaxing University, Jiaxing, Zhejiang 314001, PR China;1. Institute of Environmental, Chemical and Pharmaceutical Sciences, Federal University of São Paulo, Diadema, SP, Brazil;2. State University of Ponta Grossa (UEPG), Chemistry Department, Av. Gal. Carlos Cavalcanti, 4748, 84030-900 Ponta Grossa, PR, Brazil;1. M. Curie-Skłodowska University, Faculty of Chemistry, Department of Analytical Chemistry and Instrumental Analysis, M. Curie-Skłodowska Sq. 3, 20-031 Lublin, Poland;2. M. Curie-Skłodowska University, Faculty of Chemistry, Department of Radio Chemistry and Colloid Chemistry, M. Curie-Skłodowska Sq. 3, 20-031 Lublin, Poland;3. Medical University of Lublin, Department of Prosthetic Dentistry, Karmelicka 7, 20-081 Lublin, Poland;4. Medical University of Lublin, Department of Paediatric Neurology, Prof. A. Gębala 6, 20-093 Lublin, Poland;1. College of Material Science and Engineering, Chongqing University, Chongqing 400044, PR China;2. Department of Cardiology, Xinqiao Hospital, Third Military Medical University, Chongqing 400037, PR China;3. National Key Laboratory of Fundamental Science of Micro/Nano-Devices and System Technology, Chongqing University, Chongqing 400044, PR China |
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| Abstract: | The cyclic voltammetry responses and the redox switching dynamics of poly(3,4-ethylenedioxythiophene) (PEDOT) in a room-temperature ionic liquid, 1-ethyl-3-methylimidazolium bis((trifluoromethyl)sulfonyl)amide (EMImTf2N), were investigated. The shape of the cyclic voltammograms showed two anodic and two cathodic peaks. These peak currents varied linearly with the scan rate indicating a thin-layer behaviour. No memory effects were observed during the cyclic voltammetry experiments in this ionic liquid. On the other hand, the redox switching dynamics of PEDOT were studied by means of potential step experiments. The analysis of chronocoulograms in term of RC-circuits indicated that the time dependence of the charge transferred during the potential step showed two time constants. These results were consistent with the postulated structure or morphology of the PEDOT film which contained two types of coexisting zones: a compact and an open structures. |
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