One-Step Synthesis CuCoNiS x O 4−x Thio/Oxy Spinel on Ni Foam for High-Performance Asymmetric Supercapacitors

Anastassiya A. Migunova (), Renata R. Nemkayeva, Yeldar A. Zhakanbayev and Yuriy Zh. Tuleushev
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Anastassiya A. Migunova: Institute of Nuclear Physics, Ibragimov St. 1, Almaty 050032, Kazakhstan
Renata R. Nemkayeva: Department of Physics and Technology, Al-Farabi Kazakh National University, Al-Farabi Av. 71, Almaty 050040, Kazakhstan
Yeldar A. Zhakanbayev: Institute of Nuclear Physics, Ibragimov St. 1, Almaty 050032, Kazakhstan
Yuriy Zh. Tuleushev: Institute of Nuclear Physics, Ibragimov St. 1, Almaty 050032, Kazakhstan

Energies, 2025, vol. 18, issue 3, 1-13

Abstract: Mixed transition metal sulfides are promising materials for positive electrodes of asymmetric supercapacitors because they have a large potential for increasing the electrical characteristics of these devices. The paper presents the results of a study of a material based on spinel CuCoNiS x O 4−x with both sulfide and oxide sublattices, prepared by a one-step hydrothermal method directly on nickel foam, forming an array of whiskers. Electrochemical studies showed that a positive electrode, CuCoNiS 2 O 2 , exhibited a high specific capacitance of 3612 F g −1 at a current density of 1 A g −1 . The assembled asymmetric supercapacitor with activated carbon as a negative electrode achieved a specific capacitance of 133.5 F g −1 at 1 A g −1 and a potential window of 1.7 V. Its energy density was 53.6 Wh kg −1 at a power density of 805 W kg −1 and the power density reached 17,000 W kg −1 at an energy density of 18.9 W h kg −1 . The assembled device exhibits 52% of capacitance retention after the 20,000 cycles at a current density of 10 A g −1 with 97% coulombic efficiency. These results demonstrate that the CuCoNiS x O 4−x system is competitive with other quaternary transition metal sulfides, and this type of spinel is a perspective electrode material for high-performance supercapacitors.

Keywords: CuCoNiSO; mixed transition metal sulfides; thio/oxy spinel; asymmetric supercapacitors (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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