Journal
DIAMOND AND RELATED MATERIALS
Volume 96, Issue -, Pages 231-236Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.diamond.2019.05.015
Keywords
Carbon onions; Supercapacitor; Conductive agent; Nanopore; Specific capacity
Categories
Funding
- Key R&D Projects of Shanxi Province [201803D31049]
- Natural Science Foundation of Shanxi Province [201801D221341]
- 59th batch of Open Category China Postdoctoral Funds [2016M592654]
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In order to enhance the performance of supercapacitors, electrode materials and electrolytes have drawn a great deal of attention, however, there is limited research on conductive agents. Carbon onions were reported as a promising conductive agent for supercapacitor. In this paper, highly graphitized carbon onions were prepared by chemical vapor deposition using methane as carbon source and then purified with pickling - calcination - pickling method. The purified carbon onions and commercial super-P were employed as conductive agents of supercapacitors with the same proportion and dosage. Electrochemical tests reveal that carbon onion conductive agent provides an excellent electrochemical performance for supercapacitor, including high specific capacity (142.3 F/g) and relatively stable cycle stability (86.9% capacity retention after 5000 cycles). We believe that the nanopores among packing carbon onions are responsible for the enhanced performance of supercapacitor.
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