| 초록 |
In this study, we introduce a novel and straightforward approach to both the synthesis of nitrogen/iodine co-doped graphene (NIG) and the application of the NIG as energy device electrodes. Graphene oxide (GO) powder has many oxygen functional groups all over the basal plane and edges of the graphene. The NIG can be easily synthesized using GO and phenylhydrazine-based reductant, which are selectively reacted with oxygen species in grahene and then covalently bonded to graphene. The specific capacitance of NIG is similar to that of nitrogen doped graphene(NG), even though the surface area of the NIG is only 20% compared with the NG. In order to confirm the long-term stability of the doped atoms, we perform the cycling durability of the NG and NIG for 10,000 cycles with a voltage window ranging from -0.8 to 0.2 V. After 10,000 cycles, the NG and NIG show the loss of the specific capacitance of 13.0 and 3.9 %, respectively, indicating the better long-term stability of the NIG. |
