1. In situ chemical synthesis of sandwich-structured MnO2/graphene nanoflowers and their supercapacitive behavior.
- Author
-
Liu, Jinlong, Zhang, Yaqian, Li, Yaping, Li, Jun, Chen, Zehua, Feng, Haibo, Li, Junhua, Jiang, Jianbo, and Qian, Dong
- Subjects
- *
SANDWICH construction (Materials) , *MANGANESE dioxide , *GRAPHENE synthesis , *NANOSTRUCTURED materials synthesis , *SUPERCAPACITORS - Abstract
We report the fabrication of sandwich-structured MnO 2 /graphene (MG) nanoflowers by an in situ chemical redox reaction between mesoporous carbon and KMnO 4 , which was characterized by various techniques. The results demonstrate that the mesoporous carbon was corroded into interconnected graphene framework with ultrathin MnO 2 nanofilms deposited simultaneously on both sides of the as-generated graphene sheets. The as-synthesized MG exhibits excellent supercapacitive behaviours in a wide potential window from −0.2 to 1.2 V vs. saturated calomel electrode with a 0.5 M aqueous Li 2 SO 4 solution as the electrolyte. Specially, the MG electrode delivers a reversible gravimetric capacitance of ∼240 F g −1 at 1 A g −1 for 1000 cycles with retention rate up to 96%. The significant synergistic efforts and structure hybridization contribute to such improved electrochemical properties, indicating that the MG hybrid holds great promise in the application of high-performance supercapacitors. [ABSTRACT FROM AUTHOR]
- Published
- 2015
- Full Text
- View/download PDF