Research On Graphene Based Electrode Materials For Flexible And Fibrous Supercapacitors

With the rapid development of information science, materials science and textile engineering etc, and the people who are pursuit of their usual clothes and utility cloths, the development of e-textiles meets these needs. To integrate the textiles and electronics truly, is becoming the pressing matter of promoting and developing e-textiles. Therefore, R & D fibrous shape of the power electronic components is more urgent.Entering the new century, the shortage of energy impacts on the global economy and people’s daily life, and people pay more and more attention on the development of clean and efficient green clean energy. Therefore, to develop the portable fibrous and flexible devices with high energy density and power density is significant. So to develop the fibrous and flexible supercapacitor will be the most ideal choice for the e-textiles undoubtedly. Meanwhile, as a new 2-D nanomaterial, graphene with a number of novel physical properties, is considered as the most ideal electrode materials for the carbon based supercapacitors. Sandwich structure, large capacity and high efficiency supercapacitors have been prepared already with graphene, which has not been applied to the fibrous and flexible supercapacitors yet.In this paper, three different kinds of fibrous and flexible graphene based electrodes are prepared by electrochemical deposit method with basis material graphene oxide and the electrodes are characterized and electrochemical tested, main work includes:(1) The outstanding performance of the graphene oxide and carbon nanospheres with uniform dimension are prepared and characterized,which lay the foundation for the subsequent experiment. And we discuss the advantages and disadvantages of graphene chemical reduction method and thermal reduction method in the experimental process also.(2) Fibrous and flexible electrodes with graphene nanolayered structure are prepared by using different reduction methods by electrochemical deposit the graphene oxide on the surface of the conductive fiber. The electrode has a certain super capacitor performance which was analyzed by electrochemical tests. However, the stacking of graphene sheets in the electrodes and the re-graphite in the process of thermal reduction have an effect on the properties of the electrodes.(3) The flexible fiber electrode of graphene foam was prepared by electrophoretic deposition, using the way of thermal reduction, in order to solve the problems arise in(2), using the method of the electrophoretic deposition. The electrode performance is not very excellent which can not be compared with pure graphene electrode.(4) Fibrous and flexible electrodes with the graphene and carbon nanospheres hierarchical nanostructure are prepared by using different reduction methods by electrochemical deposit the graphene oxide and carbon nanospheres on the surface of the conductive fiber. The electrode has the best electrochemical performance by the introduction of nano carbon spheres into the layered structure of graphene.(5) The experimental method and the structure of the electrodes’ material are analyzed by analyzing the experiment data and the fitting data. The performance of the electrode with hierarchical nanostructure comprising graphene and carbon nanospheres reduced with electrochemical the most excellent properties by theory.(6) A fibrous and flexible supercapacitor is prepared by using the electrodes with the hierarchical nanostructure comprising graphene and carbon nanospheres. The electrochemical properties of the supercapacitor are tested also, and an excellent performance-53.6 mF cm-2 is achieved in 6 M KOH electrolyte.In this paper, different kinds of fibrous and flexible electrodes based graphene nanostructure by electrochemical deposition method according to the graphene prepared methods and the characteristics of this experiment. We think that the electrodes with the graphene and carbon nanospheres hierarchical nanostructure achieve the best effect, reduced by HI, by analyzing the electrochemical test data and fitting data, and the fibrous and flexible supercapacitor is prepared also.