Preparation of Supercapacitors on Flexible Substrates with Electrodeposited PEDOT/Graphene Composites
Preparation of Supercapacitors on Flexible Substrates with Electrodeposited PEDOT/Graphene Composites
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DOI：
10.1021/acsami.5b05937
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发表时间：
2015-10-14
影响因子：
9.5
通讯作者：
Lupo, Donald
中科院分区：
文献类型：
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作者：
Lehtimaki, Suvi;Suominen, Milla;Lupo, Donald
在离子液体(BMIMBF4)中，通过EDOT的电氧化，将聚(3，4-乙二氧基噻吩基)(PEDOT)和氧化石墨烯(GO)组成的复合膜电化学聚合在柔性电极上。比较了两种聚合方法，发现循环伏安法(CV)比恒电位聚合更有利于PEDOT/GO薄膜的生长。沉积后，在不使用任何还原剂的情况下，通过重复阴极电位循环的快速电化学方法将所掺入的GO还原为rGO。在BMIMBF4中用3电极构型对薄膜进行了表征。通过循环伏安和恒流放电测试，研究了复合薄膜组装成的含水电解液的对称超级电容器。结果表明，PEDOT/rGO复合材料比纯PEDOT和未还原复合薄膜具有更好的电容性能。对超级电容器的循环稳定性进行了测试，结果表明，连续2000次充放电循环后，超级电容器的比容仍保持在初始值的90%以上。超级电容器在室内光能收集器中作为储能装置，带有印刷有机太阳能电池和印刷电致变色显示器。这一结果为能源自主、低功耗和一次性电子产品的发展提供了良好的前景。
Composite films consisting of poly(3,4-ethylenediox-ythiophene) (PEDOT) and graphene oxide (GO) were electro-chemically polymerized by electrooxidation of EDOT in ionic liquid (BMIMBF4) onto flexible electrode substrates. Two polymerization approaches were compared, and the cyclic voltammetry (CV) method was found to be superior to potentiostatic polymerization for the growth of PEDOT/GO films. After deposition, incorporated GO was reduced to rGO by a rapid electrochemical method of repetitive cathodic potential cycling, without using any reducing reagents. The films were characterized in 3-electrode configuration in BMIMBF4. Symmetric supercapacitors with aqueous electrolyte were assembled from the composite films and characterized through cyclic voltammetry and galvanostatic discharge tests. It was shown that PEDOT/rGO composites have better capacitive properties than pure PEDOT or the unreduced composite film. The cycling stability of the supercapacitors was also tested, and the results indicate that the specific capacitance still retains well over 90% of the initial value after 2000 consecutive charging/discharging cycles. The supercapacitors were demonstrated as energy storages in a room light energy harvester with a printed organic solar cell and printed electrochromic display. The results are promising for the development of energy-autonomous, low-power, and disposable electronics.