One-Step Synthesis CuCoNiS<sub>x</sub>O<sub>4−x</sub> Thio/Oxy Spinel on Ni Foam for High-Performance Asymmetric Supercapacitors
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<sub>...
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| Main Authors: | , , , |
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| Format: | Article |
| Language: | English |
| Published: |
MDPI AG
2025-01-01
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| Series: | Energies |
| Subjects: | |
| Online Access: | https://www.mdpi.com/1996-1073/18/3/561 |
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| Summary: | 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<sub>x</sub>O<sub>4−x</sub> 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<sub>2</sub>O<sub>2</sub>, exhibited a high specific capacitance of 3612 F g<sup>−1</sup> at a current density of 1 A g<sup>−1</sup>. The assembled asymmetric supercapacitor with activated carbon as a negative electrode achieved a specific capacitance of 133.5 F g<sup>−1</sup> at 1 A g<sup>−1</sup> and a potential window of 1.7 V. Its energy density was 53.6 Wh kg<sup>−1</sup> at a power density of 805 W kg<sup>−1</sup> and the power density reached 17,000 W kg<sup>−1</sup> at an energy density of 18.9 W h kg<sup>−1</sup>. The assembled device exhibits 52% of capacitance retention after the 20,000 cycles at a current density of 10 A g<sup>−1</sup> with 97% coulombic efficiency. These results demonstrate that the CuCoNiS<sub>x</sub>O<sub>4−x</sub> system is competitive with other quaternary transition metal sulfides, and this type of spinel is a perspective electrode material for high-performance supercapacitors. |
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| ISSN: | 1996-1073 |