二氧化锰/石墨烯/棉织物复合电极的制备及其电化学性能

Preparation and electrochemical properties of MnO2/graphene/cotton fabric composite electrode

为研究并增强柔性织物电极的电化学性能,采用改进Hummers法制备得到高浓度氧化石墨烯水溶胶,并通过干涂层法将氧化石墨烯涂覆于棉织物表面,经化学-微波两步还原法还原氧化石墨烯,制备了石墨烯/棉织物。进一步采用电化学沉积法将二氧化锰沉积在石墨烯/棉织物上,得到二氧化锰/石墨烯/棉织物复合电极材料。借助扫描电子显微镜、X射线衍射仪和红外光谱仪对复合电极材料的形貌和结构进行表征。研究结果表明:复合电极材料在0.25 A/g的电流密度下比电容达到490 F/g,1000次电容放电后电容保持在95.5%,能量密度达到17.01 W·h/kg。

In order to enhance the electrochemical properties of flexible fabric electrodes,high concentration graphene oxide hydrosol was prepared by improved Hummers method,the graphene oxide was then coated onto cotton fabric through an environmentally friendly″dry-coating″method,and graphene/cotton fabric was prepared by subsequent″two-step reduction″method of chemical-microwave reduction.Then the MnO 2/graphene/cotton fabric composite electrode materials were prepared through electrochemical deposition of MnO 2 on graphene/cotton fabric material.The morphology and structure of composite electrode materials were characterized by scanning electron microscopy,X-ray diffraction,and infrared spectrum.The results show that the specific capacitance of composite electrode material reaches 490 F/g at current density of 0.25 A/g.After 1000 capacitance discharges,the capacitance remains at 95.5%and the energy density reaches 17.01 W·h/kg.