Loading...
Please wait, while we are loading the content...
Similar Documents
Ultra-High Energy Density Hybrid Supercapacitors Using $MnO_{2}$/Reduced Graphene Oxide Hybrid Nanoscrolls
| Content Provider | MDPI |
|---|---|
| Author | Rani, Janardhanan. R. Thangavel, Ranjith Kim, Minjae Lee, Yun Sung Jang, Jae-Hyung |
| Copyright Year | 2020 |
| Description | Manganese oxide (MnO2) is a promising material for supercapacitor applications, with a theoretical ultra-high energy density of 308 Wh/kg. However, such ultra-high energy density has not been achieved experimentally in MnO2-based supercapacitors because of several practical issues, such as low electrical conductivity of MnO2, incomplete utilization of MnO2, and dissolution of MnO2. The present study investigates the potential of MnO2/reduced graphene oxide (rGO) hybrid nanoscroll (GMS) structures as electrode material for overcoming the difficulties and for developing ultra-high-energy storage systems. A hybrid supercapacitor, comprising MnO2/rGO nanoscrolls as anode material and activated carbon (AC) as a cathode, is fabricated. The GMS/AC hybrid supercapacitor exhibited enhanced energy density, superior rate performance, and promising Li storage capability that bridged the energy–density gap between conventional Li-ion batteries (LIBs) and supercapacitors. The fabricated GMS/AC hybrid supercapacitor demonstrates an ultra-high lithium discharge capacity of 2040 mAh/g. The GMS/AC cell delivered a maximum energy density of 105.3 Wh/kg and a corresponding power density of 308.1 W/kg. It also delivered an energy density of 42.77 Wh/kg at a power density as high as 30,800 W/kg. Our GMS/AC cell’s energy density values are very high compared with those of other reported values of graphene-based hybrid structures. The GMS structures offer significant potential as an electrode material for energy-storage systems and can also enhance the performance of the other electrode materials for LIBs and hybrid supercapacitors. |
| Starting Page | 2049 |
| e-ISSN | 20794991 |
| DOI | 10.3390/nano10102049 |
| Journal | Nanomaterials |
| Issue Number | 10 |
| Volume Number | 10 |
| Language | English |
| Publisher | MDPI |
| Publisher Date | 2020-10-16 |
| Access Restriction | Open |
| Subject Keyword | Nanomaterials Electrochemistry Hybrid Supercapacitors Mno2-based Supercapacitors Ultra-high Energy Density Reduced Graphene Oxide |
| Content Type | Text |
| Resource Type | Article |
