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<p>The design of electrode materials with special structures and cooperative multi-element interactions plays a vital role in enhancing the real-world usability of supercapacitors. In this work, nickel–cobalt bimetallic sulfide submicron spheres with yolk-shell structure were successfully synthesized by two-step self-template method. The size and electrochemical properties of NC-G precursor submicron spheres were controlled by calcination at different temperatures of 200, 250, 300, and 350&#xa0;°C. Then, Ni<sub>1.5</sub>Co<sub>1.5</sub>S<sub>4</sub> submicron spheres with yolk-shell structure were obtained by one-step solvothermal sulfidation using the optimized precursor as self-template. Furthermore, the effects of vulcanization times of 3&#xa0;h, 6&#xa0;h, and 9&#xa0;h on the morphology and electrochemical properties of the material were systematically investigated. The Ni<sub>1.5</sub>Co<sub>1.5</sub>S<sub>4</sub> electrode, synthesized under optimum circumstances, exhibits remarkable electrochemical performance, with a specific capacitance of 1336.4&#xa0;F/g at 1&#xa0;A/g, maintaining 75.7% of its capacity at 10&#xa0;A/g,&#xa0;retaining 79.1% of its capacitance after 1500 cycles. Furthermore, Ni<sub>1.5</sub>Co<sub>1.5</sub>S<sub>4</sub> functions as the cathode material, while functions carbon (AC) acts as the anode, establishing an asymmetric supercapacitor (ASC). The device delivers noteworthy energy density, attaining 56.8 Wh/kg at a power density of 800 W/kg, and exhibits excellent cycle life, retaining 76.4% of its capacitance even after 1000 cycles.</p>

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Yolk-shell structured Ni1.5Co1.5S4 submicron spheres via self-template synthesis for supercapacitors

  • 期刊论文

  • 发表日期：

    2026年2月6日

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  • Zhenya Wei,
  • Jiahong Zheng,
  • Peng Zhao

摘要

The design of electrode materials with special structures and cooperative multi-element interactions plays a vital role in enhancing the real-world usability of supercapacitors. In this work, nickel–cobalt bimetallic sulfide submicron spheres with yolk-shell structure were successfully synthesized by two-step self-template method. The size and electrochemical properties of NC-G precursor submicron spheres were controlled by calcination at different temperatures of 200, 250, 300, and 350 °C. Then, Ni1.5Co1.5S4 submicron spheres with yolk-shell structure were obtained by one-step solvothermal sulfidation using the optimized precursor as self-template. Furthermore, the effects of vulcanization times of 3 h, 6 h, and 9 h on the morphology and electrochemical properties of the material were systematically investigated. The Ni1.5Co1.5S4 electrode, synthesized under optimum circumstances, exhibits remarkable electrochemical performance, with a specific capacitance of 1336.4 F/g at 1 A/g, maintaining 75.7% of its capacity at 10 A/g, retaining 79.1% of its capacitance after 1500 cycles. Furthermore, Ni1.5Co1.5S4 functions as the cathode material, while functions carbon (AC) acts as the anode, establishing an asymmetric supercapacitor (ASC). The device delivers noteworthy energy density, attaining 56.8 Wh/kg at a power density of 800 W/kg, and exhibits excellent cycle life, retaining 76.4% of its capacitance even after 1000 cycles.