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Multifunctional Carbon for Electrochemical Double-Layer Capacitors

机译：电化学双层电容器用多功能碳

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摘要

Multifunctional carbon materials are prepared for application as an active electrode material in an electrochemical capacitor displaying both charge storage and binder properties. The synthesis of the materials involves the functionalization of high surface area Black Pearls 2000 carbon black by a covalent attachment of polyacrylic acid. The polyacrylic acid polymer is formed by atom transfer radical polymerization using 1-(bromoethyl) benzene groups initially bonded to the carbon by spontaneous grafting from the corresponding diazonium ions. The grafting of 1-(bromoethyl) benzene and polyacrylic acid is confirmed by thermogravimetric analysis, Fourier transform infrared spectroscopy, energy-dispersive X-ray spectroscopy, and nitrogen gas adsorption isotherm. The composite electrode films prepared from the modified carbon are more hydrophilic and have better wettability in an aqueous electrolyte than the one prepared with the unmodified carbon. The modified electrodes also show a higher specific capacitance (approximate to 140 F g(-1)), a wider working potential window (1.5 V) and excellent specific capacitance retention upon cycling (99.9% after 5000 cycles) in an aqueous 0.65 M K2SO4 electrolyte. Moreover, a relatively high specific capacitance (approximate to 90 F g(-1)) is maintained at a scan rate of 1000 mV s(-1) with the polyacrylic-acid-modified carbon electrode.
机译：制备多功能碳材料以用作电化学电容器中的活性电极材料，其既显示电荷存储又显示粘合剂性能。材料的合成涉及通过聚丙烯酸的共价连接来实现高表面积的Black Pearls 2000炭黑的功能化。聚丙烯酸聚合物是通过使用自相应的重氮离子自发接枝而最初键合到碳上的1-（溴乙基）苯基通过原子转移自由基聚合而形成的。通过热重分析，傅里叶变换红外光谱，能量色散X射线光谱和氮气吸附等温线确认了1-（溴乙基）苯和聚丙烯酸的接枝。由改性碳制成的复合电极膜比由未改性碳制成的复合电极膜在水性电解质中更亲水并且具有更好的润湿性。改性电极还显示出更高的比电容（约140 F g（-1）），更宽的工作电势窗口（1.5 V）和在0.65 M K2SO4水溶液中循环时具有出色的比电容保持率（5000次循环后为99.9％）。电解质。而且，用聚丙烯酸改性的碳电极以1000mV s（-1）的扫描速率保持相对较高的比电容（约90F g（-1））。

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