石墨烯/针织复合电极材料的制备及性能测试

Preparation and performance test of graphene/knitted composite electrode

为了满足柔性智能可穿戴电子产品的供电需求,设计了一种与之匹配的柔性超级电容器。电极材料是决定超级电容器性能的关键因素,为提高电极材料的电化学性能和耐弯曲性能,以针织物为基底,采用电化学沉积法制备石墨烯/针织复合电极材料。通过SEM测试表征电极材料的表观形貌及结构;通过恒流充放电、循环伏安以及交流阻抗等测试表征电极材料的电化学性能。试验结果表明:石墨烯/涤棉针织复合电极最佳电沉积时间为150 min,比电容为57.76 F/g、电阻为21.14Ω;经过1000次循环充放电后,电容保持率仍然可达82.2%,循环寿命长且耐弯曲性能优异。

In order to meet the power supply requirements of flexible smart wearable electronic products,a flexible supercapacitor is designed.The electrode material is a key factor in determining the performance of a supercapacitor.In order to improve the electrochemical properties and bending resistance of electrode materials,knitted fabric is used as substrate,and graphene/knitted composite electrode materials are prepared by electrochemical deposition.The surface morphology and structure of electrode materials are characterized by SEM test.The electrochemical properties of electrode materials are characterized by the test of galvanostatic current charge/discharge,cyclic voltammetry and electrochemical impedance spectroscopy.The results show that the best electrodeposition time of graphene/polyester/knitted composite electrode is 150 min,the specific capacitance is 57.76 F/g,and the resistance is 21.14Ω.After 1000 cycles of charge and discharge,the capacitance retention rate is still up to 82.2%with a long cycle life and an excellent property of bending resistance.