Preparation Of Graphene-based Energy Storage Materials And Their Application In Electrochemical Anticorrosion

Graphene, as one of the distinct 2D nanostructure materials, is considered as the most attractive material since it was reported in 2004 because of its extraordinary properties, such as large surface area(2630 m²g^-1), fascinating electron mobility（2.5×105 cm²V（-1）s（-1））, excellent thermal conductivity（5000 W mK（-1）） and strong mechanical stiffness（1 TPa）. Especially in the fields of energy storage, graphene application played an important role. However, the application of graphene is still hampered by its native defect,such as poor solubility in water, easy agglomeration and stacking of graphene sheets. To addresss this drawback, future research of graphene-based materials should be carried out.In this work, the sulfonated graphene/MnO2（SG/MnO2）and sulfonated graphene / multi-walled carbon nanotubes（MWCNTs）/MnO2 composites were obtained by the hydrothermal synthesis method and freeze-drying method, respectively. The main woks include as following aspect:（1） Based on the template-assisted method, we developed a 3D porous graphene nanostructure was explored by the template-assisted method. We demonstrated the influence of the experiment condition on the morphology of graphene. It is found that the nanobeads structured graphene would transfer to macro-porous structure, when the surface charge of the polystyrene（PS） particles changed.（2）The nano-particles, such as MnO2 were deposited on the 3D graphene porous structures according to the hydrothermal synthesis method. We also discussed the effect of the deposited quality on the electrochemical proprieties. The 3D graphene- carbon nanotube（SG-MMCNTs） aerogel materials were obtained by the utilization of unidirectional freezing and the ternary composite materials of SG/ MMCNTs /MnO2 was prepared by the hydrothermal synthesis. The structures of these nanocomposites were characterized by SEM, TEM, X-ray diffractmeter（XRD） and so on.（3） Electrochemical measurements were conducted using a three-electrode mode. Typical CV curves, GCD curves and EIS curves were measured.（4） The button cell were assembled by the active materials and their application in the cathodic protection of metals was also carried out.