石墨烯基聚苯胺水凝胶的电化学性能研究

通过两步溶液自组装方法,制备了具有三维多孔网络结构的石墨烯基聚苯胺复合水凝胶(PR-x),并通过SEM、XRD、FT-IR、Raman、XPS等表征手段对样品的微观形貌和结构组成进行了表征分析.结果表明,聚苯胺均匀地负载于三维多孔石墨烯网络骨架,且能够显著抑制石墨烯的团聚现象.研究了石墨烯基聚苯胺复合水凝胶电极的电化学性能.当聚苯胺质量分数为75％,电流密度为1 A·g-1时,比电容为762.8 F·g-1;当扫描速率从5 mV·s-1增加到50 mV·s-1时,倍率保留率高达77％,经过3000次恒电流充放电后比电容保留率仍高达89.27％.该石墨烯基聚苯胺复合水凝胶电极作为超级电容器表现出优异的放电容量、倍率性能和循环稳定性,具有一定的潜在应用价值.

Study on Electrochemical Performance of Graphene Based Polyaniline Hydrogel

In this study, a simple two-step strategy of self-assembly method is used to fabricate the graphene-based polyaniline composite hydrogel (PR-x) which attains a three-dimensional porous network structure. The microscopic morphology and structure composition are characterized and analyzed by SEM, XRD, FT-IR, Raman, XPS and other characterization methods. The results show that polyaniline (PANI) is uniformly distributed on the framework of three-dimensional porous graphene network, which can significantly inhibit the agglomeration of graphene. In addition, the electrochemical performance of graphene-based polyaniline composite hydrogel electrodes as supercapacitor is systematically studied. When the PANI content is high up to 75%, the specific capacitance is found to be as high as 762.8 F·g-1 at the current density of 1 A·g-1. Likewise, the specific capacitance retention rate is still as high as 77% when the scan rate increases from 5 mV·s-1 to 50 mV·s-1, meanwhile, the cycling stability is high up to 89.27% even after 3 000 cycles. The graphene-based polyaniline composite hydrogel electrode as a supercapacitor exhibits high specific capacity, excellent rate and cycling stability, providing the potential supercapacitor application.