N-doped Porous Carbon with ZIF-67-derived CoFe2O4-Fe Particles for Supercapacitors
JOURNAL OF COLLOID AND INTERFACE SCIENCE(2024)
Liaoning Key Lab of Lignocellulose Chemistry and Biomaterials
Abstract
The development of novel materials for electrodes with high energy densities is essential to the advancement of energy storage technologies. In this study, N-doped layered porous carbon with ZIF-67-derived binary CoFe2O4-Fe particles was successfully fabricated by the pyrolysis of an Fe-based chitosan (CS) hydrogel mixed with ZIF-67 particles. Various characterization techniques were employed to assess the performance of the prepared porous CoFe2O4-Fe@NC composite. This composite exhibits excellent performance owing to the effective combination of multivalent CoFe2O4-Fe particles derived from ZIF-67 with N-doped porous carbon substances with a high surface area, which helps to accelerate ion and charge transfer. The specific capacitance of the CoFe2O4-Fe@NC composite carbonized at 700 degrees C reached 3960.9F/g at 1 A/g. When this composite is combined with activated carbon (AC) to construct an asymmetric supercapacitor (ASC), a density of energy of up to 84.9 W h kg(-1) is attained at a power capacity of 291.6 W kg(-1). Moreover, this composite maintained a capacitance retention of up to 94.9 % after 10,000 cycles. This work offers new perspectives on high-performance supercapacitors and their applications.
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Key words
ZIF-67,CS,N-doped porous carbon,CoFe2O4-Fe@NC,Supercapacitor
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