1. Manganese dioxide anchored on hierarchical carbon nanotubes/graphene/diatomite conductive architecture for high performance asymmetric supercapacitor.
- Author
-
Hu, Zhufeng, Ma, Kui, Tian, Wen, Wang, Feifei, Zhang, Hualian, He, Jing, Deng, Kuan, Zhang, Yu Xin, Yue, Hairong, and Ji, Junyi
- Subjects
- *
SUPERCAPACITOR electrodes , *MANGANESE dioxide , *CARBON nanotubes , *SUPERCAPACITOR performance , *DIATOMACEOUS earth , *SURFACE conductivity - Abstract
• Cost-effective 3D porous diatomite biomass is used to fabricate conductive networks. • The CNTs/graphene hybrid can enhance the electric conductivity and surface area. • The MnO 2 @CNTs/G/diatomite shows high specific capacitance and good cyclic stability. • The ASC exhibits high energy density (64.4 W h kg−1) and power density (19.8 kW kg−1). Natural abundant and industrial available biomass diatomite is act as the porous template to in-situ grown graphene layer (G), while the carbon nanotubes (CNTs) arrays are subsequently grown on the graphene surface. The seamless anchored 1D CNTs arrays together with 3D interconnected graphene networks can construct conductive hierarchical framework to enhance the electric conductivity. Furthermore, the enlarged effective surface area of the CNTs/G/diatomite can increase the active material loading amount and facilitate the electrolyte infiltration. Therefore, the MnO 2 @CNTs/G/diatomite hybrid exhibits a highest specific capacitance of 264.0 F g−1 (based on the MnO 2 , the value is ~880.0 F g−1), good rate capability and excellent cyclic stability. Moreover, the asymmetric supercapacitor assembled by MnO 2 @CNTs/G/diatomite and microwave exfoliated graphite oxide reveals a highest energy density of 64.3 W h kg−1 and maximum power density of 19.8 kW kg−1, respectively. [ABSTRACT FROM AUTHOR]
- Published
- 2020
- Full Text
- View/download PDF