Graphene oxide (GO) is a promising two-dimensional (2D) material with high specific surface area. As a graphene derivate, its carbon skeleton is decorated with oxygen functionalities, which largely limits its electrical conductivity and application in electrochemical energy storage, especially in supercapacitors. Therefore, reducing GO to produce reduced graphene oxide (rGO) has become a widely used method for obtaining high performance electrode materials with a high conductivity and large specific surface area. Among the large number of methods to reduce graphene oxide, chemical reduction is one of the most investigated methods since it is simple, cost-effective and scalable. However, chemical reduction of GO usually involves organic solvents and toxic reductants which are environmental friendly . Recently, reducing GO with green and efficient reductant in aqueous solution has attracted many interests, and vitamin C (VC) is one of the most promising green reductants which is water soluble and can provide an efficiency as high as those conventional reductants. With such favorable features, using VC to reduce GO may still cause some unfavorable changes of the materials that is similar to other chemical reduction methods, for example, the destruction of laminar structure and morphology.