Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
6603195 | Electrochimica Acta | 2018 | 9 Pages |
Abstract
The N/P co-doped hierarchical porous carbon materials are synthesized by SiO2-template approach following potassium phosphate activation. Polyvinylidene fluoride is used as the carbon source, melamine as the nitrogen source and potassium phosphate as the phosphorus source and activator. The obtained porous carbon materials exhibit a hierarchical pore structure (â¼0.6 and â¼4â¯nm), a large specific surface area (1431â¯m2â¯gâ1) and a high nitrogen and phosphorus content. These predominant characteristics enable the CNP-5-800 sample to exhibit a superior specific capacitance of 337â¯Fâ¯g-1â¯at 0.5â¯Aâ¯gâ1 and outstanding cycling stability of 97.8% retention after 10000 cycles in a three-electrode system. Even in the two-electrode system (an all-solid-state symmetric capacitor), this kind of materials still can deliver an energy density of 23.1â¯Wâ¯hâ¯kgâ1 to 12.4â¯Wâ¯hâ¯kgâ1â¯at power densities of 720.4â¯Wâ¯kgâ1 to 13950â¯Wâ¯kgâ1, respectively, and a cycling property of 98.7% maintenance after 5000 cycles. Therefore, the practicable synthetic method and excellent electrochemical performance make CNP-x-y materials a potential candidate in supercapacitor application.
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Authors
Jing Chen, Huanming Wei, Haijun Chen, Wenhao Yao, Hualin Lin, Sheng Han,