151. One-pot synthesis of unique skin-tissue-bone structured porous carbons for enhanced supercapacitor performance.
- Author
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Yan, Dong, Guo, De-Cai, Lu, An-Hui, Dong, Xiao-Ling, and Li, Wen-Cui
- Subjects
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SUPERCAPACITOR performance , *CHARGE exchange , *SUPERCAPACITOR electrodes , *CARBON , *SUPERCAPACITORS , *IONIC liquids , *CARBONIZATION - Abstract
Based on the C 16mim PF 6 inducing microphase separation during the self-assembly of poly-benzoxazine, the skin-tissue-bone like hierarchical porous carbon with N, P co-doping was obtained, which shows a superior rate performance and a good specific capacitance. Introduction of hierarchical porous structure and heteroatom in porous carbons are always effective approaches to improve the capacitive performance for supercapacitor. However, it is still a challenge to achieve the desired structure characteristics by a convenient one-step synthesis. Herein, C 16 mimPF 6 , an ionic liquid, was introduced in the self-assembly process of poly-benzoxazine to obtain a unique skin-tissue-bone structured hierarchical porous carbon with homogeneous N, P co-doping after carbonization. As the key component, C 16 mimPF 6 works not only as a structure-directing agent to form a hierarchical structure through microphase separation mechanism, thereby promoting the transfer of ion and electron, but also as a heteroatom precursor to contribute an additional pseudocapacitance by doping phosphorus atoms on carbon matrix. The obtained porous carbon displays a high gravimetric capacitance (C g) of 209 F g−1 (especially in the carbons prepared without corrosive activation step), a good volumetric capacitance (C v) of 132 F cm−3 and an excellent area-normalized capacitance (C a) of 35 μF cm−2. Overall, this work opens a new way to design the polymer-derived carbons with easy heteroatoms doping and hierarchical porous structure. [ABSTRACT FROM AUTHOR]
- Published
- 2019
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