<p>Electrolytes are an important component in a supercapacitor as it affects the charge transfer kinetics for efficient movement of charges and also the stability of the whole device. This present investigation explores the effect of aqueous neutral electrolytes, i.e. KCl, Na<sub>2</sub>SO<sub>4</sub>, and K<sub>2</sub>SO<sub>4</sub> on the electrochemical charge storage performance of one-pot hydrothermally synthesized MoS<sub>2</sub>. Structural and morphological properties of the material were examined by x-ray diffraction (XRD), Fourier-transform infrared (FTIR), Raman and field-emission scanning electron microscopy (FESEM). The synthesised MoS<sub>2</sub> exhibited flower-like morphology,3 combining nanosheets with excellent porosity that enables rapid charge transfer. The study revealed the effect of physicochemical properties such as hydrated ionic radii and ionic conductivity of aqueous neutral electrolyte on the charge storage ability of MoS<sub>2</sub> nanosheets. The synthesized MoS<sub>2</sub> nanosheets exhibited specific capacitances of 190&#xa0;Fg<sup>−1</sup>, 130&#xa0;Fg<sup>−1</sup>, and 76&#xa0;Fg<sup>−1</sup> at a current density of 1&#xa0;Ag<sup>−1</sup> and 185.6&#xa0;Fg<sup>−1</sup>, 142.1&#xa0;Fg<sup>−1</sup>, and 79.2&#xa0;Fg<sup>−1</sup> at 10&#xa0;mVs<sup>−1</sup> for KCl, Na<sub>2</sub>SO<sub>4</sub>, and K<sub>2</sub>SO<sub>4</sub> for 1&#xa0;M electrolyte solution, respectively, as KCl offers the lowest solution resistance (3.74&#xa0;Ω). These results imply that KCl is efficient as an electrolyte for MoS<sub>2</sub>-based electrodes, resulting in high-performing supercapacitors.</p>

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Impact of Neutral Aqueous Electrolytes on Hydrothermally Prepared MoS2 Nanosheets for Supercapacitor Applications

  • Sunil Kumar,
  • Vinay Kumar,
  • Mamta Bulla,
  • Sarita Sindhu,
  • Annu Sheokand,
  • Anushree Jatrana,
  • Nitin Bhardwaj

摘要

Electrolytes are an important component in a supercapacitor as it affects the charge transfer kinetics for efficient movement of charges and also the stability of the whole device. This present investigation explores the effect of aqueous neutral electrolytes, i.e. KCl, Na2SO4, and K2SO4 on the electrochemical charge storage performance of one-pot hydrothermally synthesized MoS2. Structural and morphological properties of the material were examined by x-ray diffraction (XRD), Fourier-transform infrared (FTIR), Raman and field-emission scanning electron microscopy (FESEM). The synthesised MoS2 exhibited flower-like morphology,3 combining nanosheets with excellent porosity that enables rapid charge transfer. The study revealed the effect of physicochemical properties such as hydrated ionic radii and ionic conductivity of aqueous neutral electrolyte on the charge storage ability of MoS2 nanosheets. The synthesized MoS2 nanosheets exhibited specific capacitances of 190 Fg−1, 130 Fg−1, and 76 Fg−1 at a current density of 1 Ag−1 and 185.6 Fg−1, 142.1 Fg−1, and 79.2 Fg−1 at 10 mVs−1 for KCl, Na2SO4, and K2SO4 for 1 M electrolyte solution, respectively, as KCl offers the lowest solution resistance (3.74 Ω). These results imply that KCl is efficient as an electrolyte for MoS2-based electrodes, resulting in high-performing supercapacitors.