Novel method of preparing hierarchical porous CoFe_2O_4 by the citric acid-assisted sol-gel auto-combustion for supercapacitors

摘要

In this work, the hierarchical porous CoFe2O4 was fabricated by the citric acid-assisted sol-gel auto-combustion method. The hierarchical porous CoFe2O4 was applied as supercapacitor?s electrode and exhibited good electrochemical properties. The specific capacitance of CoFe2O4 electrode can rich 443.89 F g(-1) at current density of 1 A g(-1), and 75.12% capacitance was still retained at current density of 16 A g(-1) compared with 1 A g(-1). The cycling stability was excellent, which degraded by 20.65% after 6000 cycles. The results suggest that the synthesized hierarchical porous CoFe2O4 was a promising candidate for application to supercapacitors electrodes. Meanwhile, the novel citric acid-assisted sol-gel auto-combustion is low manufacturing cost, simple in preparation, easy to control the stoichiometric ratio, which can be further extended to synthesize other inorganic materials.