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Hetero-shaped mesoporous structure of carbon nanofibers for high-performance electrical double layer capacitors

Journal of Ceramic Processing Research
약어 : J. Ceram. Process. Res.
2021 vol.22, no.3, pp.362 - 368
DOI : 10.36410/jcpr.2021.22.3.362
발행기관 : 한양대학교 청정에너지연구소
연구분야 : 재료공학
Copyright © 한양대학교 청정에너지연구소
인용한 논문 수 :   -  
84 회 열람

Boosting the performance of electrical double layer capacitors (EDLCs) without degradation of power density or lifespandemands innovative modification of electrode materials in order to have both sufficient surface area and fast ion diffusionkinetics. Herein, carbon nanofibers (CNFs) with a unique hetero-shaped mesoporous structure were reported viadecomposition of poly (methyl methacrylate) (PMMA) and dissolution of ZnO nanoparticles during the carbonization process. To optimize electrochemical performance, the amount of ZnO nanoparticles was varied from 0 to 0.5, 1.5, or 2.5 wt%. As aresult, hetero-shaped mesoporous CNFs with 1.5 wt% ZnO nanoparticles (1.5ZnO-PCNF) exhibited the largest surface areaof 691.6 m2 g−1, providing sufficient electrochemical active sites. Moreover, 1.5ZnO-PCNF showed the highest mesopore volumefraction of 92.5%, leading to fast ion diffusion kinetics. The optimized 1.5ZnO-PCNF electrode showed a specific capacitanceof 120 F g−1 at a current density of 0.2 A g−1, 91.6% capacitance retention at a current density of 2 A g−1, and excellent cyclingstability up to 3,000 cycles (maintaining 75.8% of capacitance after 3,000 cycles). These improvements in performance weremainly attributed to a well-generated hetero-shaped mesoporous structure with a large specific surface area.

Electrical double layer capacitors, Carbon nanofibers, hetero-shaped mesopore, cycling stability, rate performance

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