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