Abstract
In this work, a three-dimensional layered NiFe2O4@Ni0.75Fe0.25S2 composite has been synthesised by a two-step electrodeposition process. In the 3 M KOH aqueous solution system, the NiFe2O4@Ni0.75Fe0.25S2 composite exhibits good electrochemical properties due to the overall synergistic effect of the two components. The layered nanostructures provide a high surface area, which increases the specific capacity of NiFe2O4@Ni0.75Fe0.25S2@NF. The current density is 1 A g−1 and the maximum specific electrostatic capacity is 734 C g−1. The construction of an asymmetric supercapacitor (ASC) involves the assembly of NiFe2O4@Ni0.75Fe0.25S2@NF//AC@NF. Operating at a current density of 1 A g−1, this ASC achieves an impressive maximum specific electrostatic capacity of 734 C g−1. In particular, the assembled NiFe2O4@Ni0.75Fe0.25S2 @NF//AC@NF ASC exhibits exceptional electrochemical performance. In particular, it demonstrates an ultra-high specific capacitance of 463 C g−1 at a current density of 1 A g−1, coupled with excellent cycle stability. Even after 10,000 charge-discharge cycles at a current density of 10 A g−1, only 3.6 % of the initial specific capacitance is lost. These impressive results show that NiFe2O4@Ni0.75Fe0.25S2@NF electrodes offer a new solution for the design of high performance aqueous supercapacitors.
Published Version
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