CoFe2O4@Carbon Spheres Electrode: A One‐Step Solvothermal Method for Enhancing the Electrochemical Performance of Hybrid Supercapacitors. Issue 2 (17th January 2020)

• Record Type: Journal Article
• Authors: Elseman, Ahmed Mourtada; Fayed, Moataz G.; Mohamed, Saad G.; Rayan, Diaa A.; Allam, Nageh K.; Rashad, Mohamed M.; Song, Qun Liang
• Is Part Of: ChemElectroChem. Volume 7:Issue 2(2020)
• Page Start: 526
• Page End: 534
• Publication Date: 2020-01-17
• Subjects: spinel ferrites -- carbon spheres -- solvothermal methods -- electrodes -- supercapacitors; Electrochemistry -- Periodicals; 541.37
• DOI: 10.1002/celc.202000005
• Languages: English
• ISSNs: 2196-0216

Abstract

Abstract: Constructing electrode materials with high energy densities are the effective way to develop asymmetric supercapacitor devices. Therefore, the inlay of conductive materials into pseudocapacitive constituents is a practical approach to increase the performance of supercapacitor electrodes. Herein, we declare a facile one‐step as an economic strategy for tailoring carbon spheres (CSs) impregnated by CoFe2 O4 to form a CoFe2 O4 @CSs composite. The CoFe2 O4 @CSs composite was fully characterized by X‐ray diffraction (XRD), Raman spectroscopy, X‐ray photoelectron spectroscopy (XPS), and transmission electron microscopy (TEM), which evidenced that CoFe2 O4 nanoparticles were densely cored inside the carbon spheres. Moreover, the electrochemical characterization of the CoFe2 O4 @CSs composite was manifested high specific capacitance of (600 F/g) at a current density (1 A/g), high performance rate, and cycling stability. CoFe2 O4 @CSs has achieved capacitance retention of 94.1 % after 5000 charge/discharge cycles at a current density of 20 mA/g. The device‐based asymmetric supercapacitors were found to improve the energy density to 27.08 Wh/kg at a power density of 750 W/kg with 99 % capacitance retention, which is higher than the values previously reported. The exceptional performance of CoFe2 O4 @CSs composites gives high priority for such materials in variant electrochemical fields, owing to the harmony between CoFe2 O4 nanoparticles and carbon spheres. Abstract : Stuck in the middle : Spinel ferrite based on carbon spheres is prepared for high‐ performance asymmetric supercapacitors with exceptional cyclic stability