Tuning the properties of flash-reduced graphene oxide electrodes for supercapacitor applications

摘要

Graphene-based porous materials have attracted broad attentions in supercapacitor (SC) applications, due to the highconductivity and large surface area. The most widely used approach to fabricate graphene-based porous electrodematerials is the reduction of graphene oxide (GO). The reduction process significantly affects the properties of reducedgraphene oxide (RGO), including the conductivity, surface chemistry and the porosity. Therefore, the control thereduction process is of great importance to produce high performance electrode materials. In this paper, we explore thecontrol of the electrical conductivity and surface chemistry of flash reduced GO material, which depends on thereduction degree. The reduction degree is tuned by varying the energy of a camera flash used to reduce the GO. Thereduction degree is characterized by X-ray photoelectron spectroscopy (XPS). We find the high reduction degree (lowoxygen content) is beneficial to achieve high electrical conductivity, however, the overall specific capacitance becomeslower. As a result, we can see that electrode surface chemistry is more dominant than its electrical conductivity inenhancing SC specific capacitance.