1. Binding Fe2O3 nanoparticles in polydopamine-reduced graphene as negative electrode materials for high-performance asymmetric supercapacitors.
- Author
-
Tian, Jinjun, Xue, Yan, Yu, Xinping, Pei, Yuanchao, Zhang, Hucheng, and Wang, Jianji
- Subjects
NEGATIVE electrode ,SUPERCAPACITOR electrodes ,ENERGY storage ,ENERGY density ,NANOPARTICLES ,GRAPHENE oxide - Abstract
Ternary composite with immobilization of Fe
2 O3 nanoparticles (NPs) onto porous polydopamine-reduced graphene oxide framework, abbreviated as Fe2 O3 @PDA-RGO, was fabricated via a simple, scalable and cost-efficient hydrothermal reaction. The as-prepared 3D Fe2 O3 @PDA-RGO nanocomposite provides a specific surface area of 119.9 m2 g-1 on account of the well-dispersed Fe2 O3 NPs (~35 nm) onto the PDA-RGO sheets as spacer. When applied as a special faradic electrode material in negative potential region, Fe2 O3 @PDA-RGO can offer 169 mA h g-1 (609 F g−1 ) at 1 A g-1 . The fabricated AC//Fe2 O3 @PDA-RGO asymmetric supercapacitor (ASC) delivers an energy density of 35.8 W h kg-1 (0.94 mW h cm-3 ) at 800 W kg-1 (21 mW cm-3 ) and an outstanding cyclic stability (75.7% capacity retention after 10,000 cycles). The good performance of Fe2 O3 @PDA-RGO in single-electrode and ASC manifests the potential the ternary composite in energy storage devices. [ABSTRACT FROM AUTHOR]- Published
- 2019
- Full Text
- View/download PDF