PEDOT / lignin biopolymer composites for electrochemical supercapacitors †
PEDOT / lignin biopolymer composites for electrochemical supercapacitors †
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发表时间：
2016
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通讯作者：
F. Ajjan;N. Casado;T. Rębiś;A. Elfwing;N. Solin;D. Mecerreyesbc;O. Inganäs
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作者：
F. Ajjan;N. Casado;T. Rębiś;A. Elfwing;N. Solin;D. Mecerreyesbc;O. Inganäs
开发可持续的有机电极材料用于储能应用是一项紧迫的任务。我们提出了一个有前途的候选人的基础上使用的木质素，第二个最丰富的生物聚合物在自然界中。这种聚合物与导电聚合物结合，其中木质素作为聚阴离子可以同时作为掺杂剂和表面活性剂。本文介绍了在木质素磺酸盐存在下，通过氧化化学和电化学聚合方法合成PEDOT/Lig生物复合材料。采用UV-Vis-NIR光谱、FTIR红外光谱、热重分析、扫描电镜、循环伏安和恒流充放电等方法对PEDOT/Lig进行了表征。与参比PEDOT电极（80.4 F g）相比，掺杂木质素的PEDOT比电容（170.4 F g）增加了一倍。增强的能量存储性能是由木质素中的醌部分产生的额外的赝电容的结果，其引起法拉第反应。此外，PEDOT/Lig是一种高度稳定的生物复合材料，在1000次充电/放电循环后仍保持约83%的电活性。这些结果表明，氧化还原掺杂策略是一种简单和直接的方法来提高PEDOT的电活性性能。
Developing sustainable organic electrode materials for energy storage applications is an urgent task. We present a promising candidate based on the use of lignin, the second most abundant biopolymer in nature. This polymer is combined with a conducting polymer, where lignin as a polyanion can behave both as a dopant and surfactant. The synthesis of PEDOT/Lig biocomposites by both oxidative chemical and electrochemical polymerization of EDOT in the presence of lignin sulfonate is presented. The characterization of PEDOT/Lig was performed by UV-Vis-NIR spectroscopy, FTIR infrared spectroscopy, thermogravimetric analysis, scanning electron microscopy, cyclic voltammetry and galvanostatic charge–discharge. PEDOT doped with lignin doubles the specific capacitance (170.4 F g ) compared to reference PEDOT electrodes (80.4 F g ). The enhanced energy storage performance is a consequence of the additional pseudocapacitance generated by the quinone moieties in lignin, which give rise to faradaic reactions. Furthermore PEDOT/Lig is a highly stable biocomposite, retaining about 83% of its electroactivity after 1000 charge/discharge cycles. These results illustrate that the redox doping strategy is a facile and straightforward approach to improve the electroactive performance of PEDOT.