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Supercapacitor devices for energy storage and capacitive dye removal from aqueous solutions

机译：超级电容器设备，用于能量存储和从水溶液中去除电容性染料

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Multiwalled carbon nanotubes (MWCNT) are coated with nitrogen doped activated carbon (NC) for applications in electrochemical supercapacitor electrodes and devices. The capacitive behavior of the electrodes and devices is tested in solutions of organic dyes. The process involves energy accumulation in electrical double layers. The accumulated energy may be further utilized to remove dyes with a similar scheme via discharge of the supercapacitor, also fully regenerating the electrode materials for further use. Proof of concept investigations involve the testing of anionic and cationic dyes and analysis of the influence of dye concentration, charge as well as charge to mass ratio on the capacitance, impedance, specific power and energy of the devices. Cyclic voltammetry and chronopotentiometry data, obtained in different voltage windows, are used for the optimization of device performance. The discussion of quartz crystal microbalance data provides an insight into the factors which govern the charge-discharge behavior. The devices show good cyclic stability. This method offers the advantage of saving energy and applicability to a variety of different dyes.
机译：多壁碳纳米管（MWCNT）涂有氮掺杂活性炭（NC），用于电化学超级电容器电极和设备。电极和设备的电容性能在有机染料溶液中测试。该过程涉及双电层中的能量积累。可以通过超级电容器的放电以类似的方案进一步利用累积的能量来去除染料，还可以完全再生电极材料以进一步使用。概念验证研究包括测试阴离子和阳离子染料，以及分析染料浓度，电荷以及电荷质量比对设备的电容，阻抗，比功率和能量的影响。在不同电压窗口中获得的循环伏安法和计时电位计数据可用于优化设备性能。石英晶体微天平数据的讨论提供了对控制充放电行为的因素的了解。该器件显示出良好的循环稳定性。该方法的优点是节省能量并适用于多种不同的染料。

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