Journal
DIAMOND AND RELATED MATERIALS
Volume 109, Issue -, Pages -Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.diamond.2020.108028
Keywords
Co-doping; Carbon nanoplate; Methylene blue; One-step; Supercapacitor
Categories
Funding
- National Natural Science Foundation of China [51773167, 51573147, 21706208]
- Natural Science Foundation of Shaanxi Province [2018JM5036, 2019CGXNG-033]
- Xianyang Science and Technology Research Project [2018k02-29]
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In this work, nitrogen (N), sulfur (S) co-doped porous carbon nanoplate (A-MBCP) is successfully prepared from methylene blue (MB) by facile one-step carbonization and activation strategy. It is an efficient method to protect the environment and meet industrialization production. The obtained carbon nanoplate exhibits in-situ doping of N, S, high specific surface area (560.46 m(2) g(-1)), interconnected and hierarchical porous morphology, together with large interlayer spacing. This unique and complex micromorphology endows the A-MBCP electrode with superior electrochemical performance, including ultra-high specific capacitance of 302 F g(-1) at 0.5 A g(-1) and excellent capacitance retention of 77.82% at 10 A g(-1) in 6 M KOH electrolyte. Furthermore, the assembled A-MBCP//A-MBCP symmetric supercapacitor displays outstanding energy density of 25 Wh kg(-1) and power density of 8000 W kg(-1) using Na2SO4 as electrolyte. Also, the high capacitance retention of 98.6% and coulombic efficiency of 97.9% are achieved for the supercapacitor after 3000 cycles at 2 A g(-1) in KOH electrolyte, implying its favorable electrochemical stability and charge/discharge reversibility. This novel preparation of high-performance supercapacitors from MB may further inspire the development of other carbon materials with heteroatoms doping applied in the energy storage application.
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