High-Performance Asymmetric Supercapacitor Based on a Bilayer Cu 0.7 Zn 0.3 CoNiS y O 4−y /Ni 3 S 2 Electrode

Anastassiya Migunova (), Maratbek Gabdullin, Renata Nemkayeva and Khabibulla Abdullin ()
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Anastassiya Migunova: Institute of Nuclear Physics, Ibragimov St. 1, Almaty 050032, Kazakhstan
Maratbek Gabdullin: School of Materials Science and Green Technology, Kazakh-British Technical University, Tole bi Street, 59, Almaty 050000, Kazakhstan
Renata Nemkayeva: Institute of Applied Sciences and Information Technologies, Tole bi Street, 293/1, Almaty 050031, Kazakhstan
Khabibulla Abdullin: Institute of Applied Sciences and Information Technologies, Tole bi Street, 293/1, Almaty 050031, Kazakhstan

Energies, 2025, vol. 18, issue 16, 1-15

Abstract: Supercapacitors have begun to successfully compete with Li-ion batteries in various portable energy storage applications, owing to their ability to enable fast charging, deliver high power and energy, and offer an exceptionally long cycle life. This paper presents the results of a study on the performance of a positive electrode composed of a Cu x Zn 1−x CoNiS y O 4−y whisker layer and an underlying porous Ni 3 S 2 layer, synthesized in a single step via the hydrothermal method. The coating with the nominal composition Cu 0.7 Zn 0.3 CoNiS 3 O/Ni 3 S 2 exhibited a high specific capacitance of 4.10 C cm −2 at a current density of 2 mA cm −2 or 9535 F g −1 at a current density of 1 A g −1 , attributed to the synergistic contribution of both layers and the optimized ratio of the four transition metals in the sulfoxide matrix. The assembled asymmetric supercapacitor (ASC), employing the obtained composite as the positive electrode and activated carbon as the negative electrode, exhibited a specific capacitance of 115 F g −1 (200 C g −1 ). It achieved a high energy density of 48.3 Wh kg −1 at a power density of 870 W kg −1 . After 20,000 charge–discharge cycles at a current density of 10 A g −1 , the ASC retained 74% of its initial capacitance, highlighting the potential of the Cu x Zn 1−x CoNiS y O 4−y electrode for high-performance energy storage applications.

Keywords: transition metal sulfides; high-performance asymmetric supercapacitors; composite materials (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2025
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