期刊
NEW CARBON MATERIALS
卷 36, 期 3, 页码 594-603出版社
ELSEVIER
DOI: 10.1016/S1872-5805(21)60062-8
关键词
Hollow carbon sphere; Graphitization; Tannic acid; Supercapacitor
资金
- Scientific and Technological Innovation Programs of Higher Education Institutions in Shanxi [2020L0330]
- Award Fund for Outstanding Doctors in Shanxi Province [20202075]
- Doctor Funds of Taiyuan University of Science and Technology [20192054]
The translation introduces the advantages, preparation method, and performance of graphitic hollow porous carbon spheres. The study successfully constructs graphitic hollow porous carbon spheres using an economic, time-saving self-assembly method and optimizes ion/electron transport in the carbon spheres, resulting in excellent performance in capacitive energy storage.
Graphitic hollow porous carbon spheres (GHPCSs) have the advantages of a unique cavity structure, high surface area and excellent conductivity, and are promising electrode materials for energy storage. A Fe-tannic acid (TA) framework synthesized using TA as the carbon source and K-3[Fe(C2O4)(3)] as a complexing agent, was self-assembled onto a melamine foam, which was converted to GHPCSs by carbonization, where the K-3[Fe(C2O4)(3)] also acts as an activating-graphitizing agent. The outer shell of the as-prepared GHPCSs has a large specific surface area, a micropore-dominated structure and excellent electrical conductivity, which ensure a large enough active surface area for charge accumulation and fast ion/electron transport in the partially graphitized carbon framework and pores. The optimum GHPCS has a high capacitance of 332.7 F g(-1) at 1 A g(-1) . An assembled symmetric supercapacitor has a high energy density of 23.7 Wh kg(-1) at 459.1 W kg(-1) in 1 mol L-1 Na2SO4. In addition, the device has long-term cycling stability with a 92.1% retention rate after 10,000 cycles. This study not only provides an economic and time-saving approach for constructing GHPCSs by a self-assembly method, but also optimizes ion/electron transport in the carbon spheres to give them excellent performance in capacitive energy storage.
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