对苯二酚增强纤维素/石墨烯电极的制备

Preparation of Hydroquinone Reinforced CNFs/RGO Electrodes

目的以纳米纤维素气凝胶为骨架,对苯二酚为增强相,并加入还原氧化石墨烯,制备纳米纤维素/还原氧化石墨烯复合电极薄膜,将其应用于超级电容器。方法采用超声处理制备纳米纤维素/氧化石墨烯混合溶液;在高温高压的环境下,加入对苯二酚,采用水热合成法和冷冻干燥法制备纳米纤维素/还原氧化石墨烯气凝胶,并最终制成电极膜。结果在纳米纤维素/还原氧化石墨烯复合气凝胶中,石墨烯可将纳米纤维素均匀包裹,形成三维多孔网络结构;纳米纤维素/还原氧化石墨烯复合电极具有良好的电化学性能,在1mol/L的H2SO4溶液中,当电流扫描速率为1mA/cm^2时,超级电容器比面积电容高达1.621F/cm^2,且在2000次循环测试后,电容保留率为88.3%。结论以纳米纤维素为基体制备的纳米纤维素/还原氧化石墨复合电极具有良好的电化学性能,可以用作超级电容器电极。

The work aims to prepare the cellulose nanofibers/reduced graphene oxide (CNFs/RGO) composite electrode film with CNFs aerogel as the skeleton,hydroquinone as the reinforcing phase and added with reduced graphene oxide,and to apply the film to the supercapacitor.CNFs/RGO solution was prepared by ultrasonic treatment.CNFs/RGO aerogel was prepared by hydrothermal synthesis and freeze-drying with hydroquinone added at high temperature and pressure,and the electrode film was finally made.In the CNFs/RGO composite aerogel,the graphene could evenly wrap the CNFs to form a three-dimensional porous network structure.The CNFs/RGO composite electrode had excellent electrochemical performance.In 1 mol/L H2SO4 solution,when the current scan rate was 1 mA/cm^2,the specific area capacitance of the supercapacitor was as high as 1.621 F/cm^2,and the capacitance retention rate was 88.3% after 2,000 cycles of testing.The CNFs/RGO composite electrode prepared with cellulose nanofibers as the substrate has excellent electrochemical performance and can be used as the supercapacitor electrode.