Effect of poly(3,4-ethylenedioxythiophene) (PEDOT) in carbon-based composite electrodes for electrochemical supercapacitors
Effect of poly(3,4-ethylenedioxythiophene) (PEDOT) in carbon-based composite electrodes for electrochemical supercapacitors
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DOI：
10.1016/j.jpowsour.2011.03.070
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发表时间：
2011-09-15
影响因子：
9.2
通讯作者：
Lekakou, Constantina
中科院分区：
文献类型：
--
作者：
Lei, Chunhong;Wilson, Peter;Lekakou, Constantina
使用活性炭与炭黑和聚（3，4-亚乙基二氧噻吩）（PEDOT）的复合电极以及有机电解质1 M TEABF（4）/PC溶液制造和测试电化学双层超级电容器电池。探讨了PEDOT对EDLC电池性能的影响，并通过电化学阻抗谱（EIS）、循环伏安法和恒电流充放电对电池进行了表征。一个广义的等效电路模型进行了数值模拟，以确定其组件的EIS数据的属性和参数。结果发现，所提出的模型拟合成功的所有测试电池的数据。PEDOT通过其伪电容效应将电极和电池电容提高到最佳PEDOT负载的最大值，并大大增加了电池的能量密度，同时最大功率密度仍保持在超级电容器水平。此外。PEDOT代替PVDF作为粘合剂，并且在电极加工期间减少了有害溶剂的释放。以PEDOT为粘结剂的活性炭-炭黑复合电极比以PVDF为粘结剂的活性炭-炭黑电极具有上级的比电容。(C)2011 Elsevier B. V.保留所有权利。
Electrochemical double layer supercapacitor cells were fabricated and tested using composite electrodes of activated carbon with carbon black and poly(3,4-ethylenedioxythiophene) (PEDOT), and an organic electrolyte 1 M TEABF(4)/PC solution. The effect of PEDOT on the performance of the EDLC cells was explored and the cells were characterised by electrochemical impedance spectroscopy (EIS), cyclic voltammetry and galvanostatic charge-discharge. A generalised equivalent circuit model was developed for which numerical simulations were performed to determine the properties and parameters of its components from the EIS data. It was found that the proposed model fitted successfully the data of all tested cells. PEDOT enhanced the electrode and cell capacitance via its pseudo-capacitance effect up to a maximum value for an optimum PEDOT loading and greatly increased the energy density of the cell while the maximum power density has been still maintained at supercapacitor levels. Furthermore. PEDOT replaced PVDF as a binder and harmful solvent release was reduced during electrode processing. Activated carbon-carbon black composite electrodes with PEDOT as binder were found to have specific capacitance superior to that of activated carbon-carbon black electrodes with PVDF binder. (C) 2011 Elsevier B.V. All rights reserved.