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High-performance capacitive behavior of layered reduced graphene oxide and polyindole nanocomposite materials

机译：层状还原氧化石墨烯和聚吲哚纳米复合材料的高性能电容行为

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摘要

In this work, a high-capacitance hybrid nanocomposite based on reduced graphene oxide (RGO) and polyindole (PIn) was fabricated via an in situ chemical oxidative polymerization approach. The structure and morphology of PIn/RGO were investigated by FT-IR, Raman spectroscopy, SEM and TEM. The electrochemical properties of this electrode in aqueous H2SO4 electrolyte were also investigated by cyclic voltammetry, galvanostatic charge/discharge, and electrochemical impedance spectroscopy (EIS). Compared to RGO and PIn electrodes, the PIn/RGO hybrid nanocomposite shows a large improved specific capacitance of 322.8 F g(-1) at 1.0 A g(-1), good stability with a cycling efficiency of 94.5% after 1000 cycles, and high energy density of 36 W h kg (1) at a high power density of 5000 W kg (1). The enhanced performance is proposed to arise from the synergetic effect between PIn and RGO. In addition, the symmetric PIn/RGO//PIn/RGO supercapacitor showed specific capacitance of 99.8 F g(-1) and only 3.7% decay after 1000 cycles. These results imply that PIn/RGO should be a promising electrode material for supercapacitor applications.
机译：在这项工作中，通过原位化学氧化聚合方法制备了基于还原氧化石墨烯（RGO）和聚吲哚（PIn）的高电容杂化纳米复合材料。通过FT-IR，拉曼光谱，SEM和TEM研究了PIn / RGO的结构和形态。还通过循环伏安法，恒电流充/放电和电化学阻抗谱（EIS）研究了该电极在H2SO4水溶液中的电化学性能。与RGO和PIn电极相比，PIn / RGO杂化纳米复合材料在1.0 A g（-1）时显示出322.8 F g（-1）的较大改进的比电容，良好的稳定性以及1000次循环后的循环效率为94.5％，并且在5000 W kg（1）的高功率密度下具有36 W h kg（1）的高能量密度。提出增强的性能是由于PIn和RGO之间的协同作用而产生的。此外，对称的PIn / RGO // PIn / RGO超级电容器显示99.8 F g（-1）的比电容，经过1000次循环后仅衰减3.7％。这些结果表明，PIn / RGO应该是用于超级电容器应用的有前途的电极材料。

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