Preparation And Electrochemical Properties Of Graphene/Cotton Composite Fabric Electrode

In this paper,the Graphene/cotton fabric composite electrode materials were prepared through an environmentally friendly "dry-coating" method and subsequent "two step reduction" method of chemical and microwave reduction,graphene/cotton fabric material was prepared.then the MnO2/graphene/cotton fabric composite electrode materials were prepared by electrochemical deposition of MnO2 on graphene/cotton fabric material.In order to develop a method for preparing flexible electrodes with convenient fabrication,good electrochemical performance and stability.The electrochemical properties of flexible electrodes were mainly studied.Firstly,on the basis of the improved Hummers method,the preparation method was further improved,and graphene oxide(GO)hydrosolwith high concentration(20-25 mg/ml)was successfully obtained.The structure of GO was characterized by Fourier transform infrared spectroscopy(FTIR),X-ray diffraction(XRD)and atomic force microscopy(AFM).Secondly,taking the resistance of graphene/cotton fabric flexible electrode as screening index,the optimum process of coated cotton fabric was obtained by single factor variable method.Further,the GO prepared by the above method was coated on the surface of cotton fabrics by an environmentally friendly "dry coating" method,and reduced by a chemical-microwave reduction "two-step reduction" method.The flexible electrode material was prepared.The morphology and structure of prepared flexible electrode materials were characterized by scanning electron microscopy,X-ray diffraction,and Raman spectrometry.The mechanical properties of flexible electrode materials were characterized by breaking strength test and fabric style test.Then the supercapacitor was assembled in sandwich structure and packaged and its electrochemical performance was discussed.The cyclic voltammetry and constant current charge-discharge tests show that the flexible sandwich structure(FSS)supercapacitor exhibits high capacitance(464 F/g,0.25A/g).The cyclic charge and discharge tests Indicate that the FSS supercapacitor exhibits well cycling stability(91.6%capacitance retention after 1000 charge-discharge cycles).The maximum energy density is 27.05 W h/kg.This easily fabricated,flexible and excellent electrochemical supercapacitor has potential as a wearable device.Based on the above two chapters,the GO was 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 and microwave reduction.Then the MnO2/Graphene/cotton fabric composite electrode materials were prepared through electrochemical deposition of MnO2 on Graphene/cotton fabric material.The morphology and structure of flexible electrode materials were characterized by scanning electron microscopy,X-ray diffraction,and infrared spectrum.The results of electrochemical properties show that the composite electrode materials exhibit high capacitance(490 F/g at 0.25A/g),good cycling stability(95.5%capacitance retention after 1000 charge and discharge cycles)and excellent energy density(17.01Wh/kg).This composite electrode materials with facile fabrication and excellent electrochemical performance and good electrochemical stability have potential as wearable device.