The interface engineering strategy of hybridizing transition metal sulfides (TMSs) with other electroactive materials has proven to be a powerful strategy to exploit advanced electrode materials for supercapacitors (SCs). Herein, CuNi2S4 nanospheres were grown directly onto carbon cloth (CC) by a single-step electrodeposition procedure, and the bimetallic selenide NiCoSe2 then was deposited over the CuNi2S4 nanospheres to create a flexible CuNi2S4@NiCoSe2 hybrid electrode material with special core-shell architecture. The nanoflower-like hybrid structure not only increases the redox active sites but also provides short paths for electron/ion transport and improves redox reaction kinetics. The CuNi2S4@NiCoSe2 electrode achieves a capacity value of 979.2 C g-1/3.43 C cm-2 at 1 A g-1 along with good rate performance, outperforming pristine CuNi2S4 and NiCoSe2. This wonderful supercapacitive behavior is related to the synergy of CuNi2S4's high conductivity and NiCoSe2's high electroactivity. Furthermore, the hybrid supercapacitor using the CuNi2S4@NiCoSe2cathode along with the porous carbon from pine pollen anode achieves an energy density (78.9 Wh kg-1 at 720.2 W kg-1) and maintains 91.4 % of original capacity after 50,000 cycles. These findings affirm that the CuNi2S4@NiCoSe2 heterostructure is structurally superior as an electrode material in advanced energy storage systems.
Keywords: Bimetallic selenides; Bimetallic sulfides; Electrodeposition; Hybrid supercapacitors.
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