石墨烯的种类对剑麻纳米纤维素/石墨烯/聚苯胺复合材料电化学性能的影响

基于绿色可再生的剑麻纳米纤维素,采用超声分散方法制备剑麻纳米纤维素/石墨烯(CNF/G)分散液,通过机械共混法制备剑麻纳米纤维素/石墨烯/聚苯胺(CNF/G/PANI)复合材料,采用红外光谱、X射线衍射、拉曼光谱和扫描电镜对复合材料的结构和形态进行表征,采用循环伏安、恒流充放电、交流阻抗等方法研究材料的电化学性能,侧重研究石墨烯的种类对CNF/G/PANI复合材料电化学性能及结构的影响。结果表明,加入石墨烯纳米片(GNS),聚苯胺(PANI)和剑麻纳米纤维素(CNF)穿插于GNS中,产生较多的孔洞,复合材料的比电容最高值达到322.25 F/g,内阻仅为0.77Ω,在5 A/g的电流密度下,循环充放电1000次,复合材料的电容保持率达到76.92%。

Electrochemical Performances of Different Types of Graphene on cellulose Nano Fiber/Graphene/Polyaniline Composites

The green renewable sisal cellulose nano fibers were mixed with different types of graphene (graphene oxide,reduction of graphene oxide and graphene nanosheet) by ultrasonic dispersion to get the sisal cellulose nano fiber/graphene dispersion(CNF/G),then adding polyaniline to prepare different graphene's type of sisal cellulose nano fiber/graphene /polyaniline (CNF/G/PANI) composite as flexible supercapacitors electrodes.Effects of different types of graphene on electrochemical performances of CNF/G/PANI composite were studied.The chemical structure and surface morphology of the composites were characterized by FT-IR,XRD,Raman and SEM.The electrochemical performances were tested by cyclic voltammetry,galvanos-tatic charge-discharge and electrochemical impedance spectroscopy.The results show that by adding graphenenanosheet,the porous structure of the CNF/ GNS/PANI composite is observed,CNF and PANI weaving in the graphene nanosheet,the specific capacitance of CNF/GNS/PANI composite comes to 322.25 F/g,the charge transfer resistance is only 0.77 Ω,the capacitance retention is still over 76.92％ of initial capacitance at 5 A/g after 1000 cycles.