One‐Dimensional Spinel Transition Bimetallic Oxide Composite Carbon Nanofibers (CoFe2O4@CNFs) for Asymmetric Supercapacitors. Issue 21 (3rd November 2021)

• Record Type: Journal Article
• Authors: Liu, Qian; Wang, Zhuang; Liu, Jie; Lu, Zhe; Xuan, Dipan; Luo, Fenqiang; Li, Shuirong; Ye, Yueyuan; Wang, Duo; Wang, Dechao; Zheng, Zhifeng
• Is Part Of: ChemElectroChem. Volume 8:Issue 21(2021)
• Page Start: 4116
• Page End: 4123
• Publication Date: 2021-11-03
• Subjects: CoFe2O4@CNFs -- electrospinning -- extra annealing time -- pseudo-capacitance -- asymmetric supercapacitor; Electrochemistry -- Periodicals; 541.37
• DOI: 10.1002/celc.202100998
• Languages: English
• ISSNs: 2196-0216

Abstract

Abstract: CoFe2 O4 composite carbon nanofibers (CoFe2 O4 @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 CoFe2 O4 @CNFs are investigated. CoFe2 O4 @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. Abstract : In a spin : CoFe2 O4 @carbon nanofibers are prepared by electrospinning and are used in asymmetric supercapacitors. The capacity retention rate reaches 87 % after 7000 cycles, and the maximum energy density reaches 21.4 Wh Kg −1 at a large voltage window of 0–1.7 V.