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<p>To enhance the energy density, power density, and cycling stability of supercapacitors, it is imperative to comprehend and control the interplay between electrodes and the electrolyte. Assessment of electrolyte properties plays a crucial role in guaranteeing the best performance of supercapacitors. In this study, electrochemical energy storage performance of symmetric supercapacitors based on 2D WS<sub>2</sub> nanosheets has been evaluated in alkaline (1&#xa0;M KOH), acidic (1&#xa0;M H<sub>2</sub>SO<sub>4</sub>), and neutral (1&#xa0;M Na<sub>2</sub>SO<sub>4</sub>) electrolytes. At a constant specific current of 1A g<sup>−1</sup><sub>,</sub> the supercapcitors exhibit specific capacitance values of 170, 108, and 89 F g<sup>−1</sup>, respectively in KOH, H<sub>2</sub>SO<sub>4</sub>,&#xa0;and Na<sub>2</sub>SO<sub>4</sub> electrolytes. At a power density of 0.8&#xa0;kW&#xa0;kg<sup>−1</sup>, the associated energy density values are calculated as 15, 9.6, and 8 Wh kg<sup>−1</sup>&#xa0;for alkaline, acidic, and neutral electrolytes, respectively. WS<sub>2</sub> nanosheets deliver superior performance in KOH electrolyte by retaining the 100% of the initial capacitance value even after 10,000 continuous charge–discharge cycles.</p>

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An investigation on the effect of aqueous electrolytes on the electrochemical performance of WS2 nanosheets

  • 期刊论文

  • 发表日期：

    2025年6月10日

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  • Visakh V. Mohan,
  • S. R. Sarath Kumar,
  • R. B. Rakhi

摘要

To enhance the energy density, power density, and cycling stability of supercapacitors, it is imperative to comprehend and control the interplay between electrodes and the electrolyte. Assessment of electrolyte properties plays a crucial role in guaranteeing the best performance of supercapacitors. In this study, electrochemical energy storage performance of symmetric supercapacitors based on 2D WS2 nanosheets has been evaluated in alkaline (1 M KOH), acidic (1 M H2SO4), and neutral (1 M Na2SO4) electrolytes. At a constant specific current of 1A g−1, the supercapcitors exhibit specific capacitance values of 170, 108, and 89 F g−1, respectively in KOH, H2SO4, and Na2SO4 electrolytes. At a power density of 0.8 kW kg−1, the associated energy density values are calculated as 15, 9.6, and 8 Wh kg−1 for alkaline, acidic, and neutral electrolytes, respectively. WS2 nanosheets deliver superior performance in KOH electrolyte by retaining the 100% of the initial capacitance value even after 10,000 continuous charge–discharge cycles.