期刊
CHEMELECTROCHEM
卷 8, 期 21, 页码 4116-4123出版社
WILEY-V C H VERLAG GMBH
DOI: 10.1002/celc.202100998
关键词
CoFe2O4@CNFs; electrospinning; extra annealing time; pseudo-capacitance; asymmetric supercapacitor
CoFe2O4 composite carbon nanofibers (CoFe2O4@CNFs) were prepared by electrospinning combined with pre-oxidation, carbonization, and extra annealing under air conditions. The resulting CoFe2O4@CNFs showed excellent capacitive characteristics, with a specific capacity of 591.8 F g(-1) at a current density of 1 A g(-1), and a high energy density of 21.4 Wh kg(-1) at a power density of 850 W kg(-1) after 7000 cycles. The asymmetric supercapacitor assembled by CoFe2O4@CNFs with activated carbon (AC) exhibited a capacitance retention rate of 87% in the 0-1.7 V voltage window.
CoFe2O4 composite carbon nanofibers (CoFe2O4@CNFs) are prepared by electrospinning combined with pre-oxidation, carbonization, and extra annealing under air conditions. The effect of different extra annealing times on the structure, morphology, and electrochemical properties of the resulting CoFe2O4@CNFs are investigated. CoFe2O4@CNFs (named as CFO/C-800-2) with a spinel structure are successfully prepared after 2 h of extra annealing for CFO/C-800-0. CFO/C-800-2 shows a mesoporous structure with a mesoporous area of 358 m(2) g(-1). CFO/C-800-2 shows pseudocapacitance characteristics with a specific capacity of 591.8 F g(-1) at a current density of 1 A g(-1). The capacitance retention rate of the asymmetric supercapacitor assembled by CFO/C-800-2 with activated carbon (AC) can reach 87 % in the 0-1.7 V voltage window, and the energy density is 21.4 Wh Kg(-1) at a power density of 850 W Kg(-1) after 7000 cycles.
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