期刊
CARBON
卷 151, 期 -, 页码 192-202出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.carbon.2019.05.043
关键词
Supercapacitor; Polyaniline; rGO; Graphene; CeO2; Asymmetric supercapacitors; Hierarchical compound; Energy storage; Scalable synthesis
资金
- Garmor Inc
- NSF MRI [XPS: ECCS:1726636]
Designing hybrid conductive polymer structures that can effectively mitigate capacitance fade and improve cycle life is critical to developing viable conductive polymer-based supercapacitors. Low cost and high yield synthesis methods that can be easily scaled-up are also crucial for industry-scale production. Herein, we report a highly scalable porous hierarchical microspheres composed of polyaniline nanofibers (PANI), reduced graphene oxide (rGO), and cerium oxide nanorods (CNRs) synthesized through a spray drying method. The functional and structural synergistic effect of the three components assembled as a 3D porous hierarchical structure which maximizes ion and charge transport while mitigating restacking and agglomeration of the nanostructures results in a composite supercapacitor material with superior electrochemical properties. The optimized ternary hierarchical microspheres exhibit a high specific capacitance (684 F g(-1)), good rate capability, excellent cycle life (92% capacitance retention after 6000 cycles at 4 A g(-1)). Furthermore, an asymmetric device fabricated with the ternary composite exhibits a high specific energy density (46.27 W h kg(-1)) at a power density of 850 W kg(-1) with a very stable cyclic performance and high coulombic efficiency. Thus, we demonstrate, for the first time, a highly scalable method to produce PANI/rGO/CNR based hierarchical microspheres as high-performance supercapacitor material. (C) 2019 Elsevier Ltd. All rights reserved.
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