Scholarlink

<p>The increasing global demand for advanced energy storage systems in portable electronics and electric vehicles necessitates the development of electrode materials with enhanced charge storage capabilities and improved cycling durability. Molybdenum disulfide (MoS<sub>2</sub>), a member of the transition metal dichalcogenides (TMDs), holds promise for supercapacitor applications; however, its practical use is constrained by its low intrinsic conductivity and tendency to restack into layers. In this work, we present a systematic study on cobalt-doped MoS<sub>2</sub> (CMS) nanoparticles synthesized via a controlled hydrothermal route with varying Co content (0, 1, 3, and 5&#xa0;mol%) to optimize their structural and electrochemical characteristics. This study demonstrates superior performance using a cost-effective stainless-steel (SS) as a substrate. X-ray diffraction (XRD) and Raman spectroscopy confirm the formation of a phase, lattice expansion, and reduced microstrain upon Co incorporation. Field emission scanning electron microscopy (FESEM) images reveal that cobalt doping promotes the evolution from aggregated nanoflower morphology to hierarchically dispersed nanosheets with enlarged surface area and accessible active sites. The optimally doped 3&#xa0;cm electrode delivers a specific capacitance of 695.13&#xa0;F g<sup>− 1</sup> at 1&#xa0;A g<sup>− 1</sup>, which is about three times higher than pristine MoS<sub>2</sub> (217.98&#xa0;F g<sup>− 1</sup>), along with an energy density of 100.6 Wh kg<sup>− 1</sup> and ~ 95.5% capacitance retention after 10,000 cycles. Electrochemical impedance spectroscopy shows a significant reduction in charge transfer resistance from 30.13 Ω to 2.15 Ω upon cobalt doping. In a symmetric two-electrode device, 3&#xa0;cm maintains a capacitance of ~ 338&#xa0;F g<sup>− 1</sup> at 2&#xa0;A g<sup>− 1</sup> and ~ 122&#xa0;F g<sup>− 1</sup> at 4&#xa0;A g<sup>− 1</sup>, with an energy density of ~ 15.5 Wh kg<sup>− 1</sup> at ~ 1090&#xa0;W kg<sup>− 1</sup>, confirming stable performance under practical conditions. These results show that controlled cobalt doping on MoS<sub>2</sub> improves conductivity, active site accessibility, and structural stability on stainless steel substrate is a practical and scalable electrode for supercapacitor applications.</p> Graphical abstract <p></p>

错误：搜索内容不能为空，请输入英文关键词
错误：关键词超出字数限制，请精简
高级检索

Engineering cobalt-doped MoS2 nanostructures on stainless steel for cost-effective supercapacitor electrodes

  • 期刊论文

  • 发表日期：

    2026年5月11日

查看全文
  • Anand Sagar,
  • Ananya Bansal,
  • Paritosh Dubey,
  • Kamlesh Yadav,
  • Somdatta Singh,
  • Ashwani Kumar,
  • Prashant Shahi,
  • Ramesh Chandra,
  • Rajan Walia

摘要

The increasing global demand for advanced energy storage systems in portable electronics and electric vehicles necessitates the development of electrode materials with enhanced charge storage capabilities and improved cycling durability. Molybdenum disulfide (MoS2), a member of the transition metal dichalcogenides (TMDs), holds promise for supercapacitor applications; however, its practical use is constrained by its low intrinsic conductivity and tendency to restack into layers. In this work, we present a systematic study on cobalt-doped MoS2 (CMS) nanoparticles synthesized via a controlled hydrothermal route with varying Co content (0, 1, 3, and 5 mol%) to optimize their structural and electrochemical characteristics. This study demonstrates superior performance using a cost-effective stainless-steel (SS) as a substrate. X-ray diffraction (XRD) and Raman spectroscopy confirm the formation of a phase, lattice expansion, and reduced microstrain upon Co incorporation. Field emission scanning electron microscopy (FESEM) images reveal that cobalt doping promotes the evolution from aggregated nanoflower morphology to hierarchically dispersed nanosheets with enlarged surface area and accessible active sites. The optimally doped 3 cm electrode delivers a specific capacitance of 695.13 F g− 1 at 1 A g− 1, which is about three times higher than pristine MoS2 (217.98 F g− 1), along with an energy density of 100.6 Wh kg− 1 and ~ 95.5% capacitance retention after 10,000 cycles. Electrochemical impedance spectroscopy shows a significant reduction in charge transfer resistance from 30.13 Ω to 2.15 Ω upon cobalt doping. In a symmetric two-electrode device, 3 cm maintains a capacitance of ~ 338 F g− 1 at 2 A g− 1 and ~ 122 F g− 1 at 4 A g− 1, with an energy density of ~ 15.5 Wh kg− 1 at ~ 1090 W kg− 1, confirming stable performance under practical conditions. These results show that controlled cobalt doping on MoS2 improves conductivity, active site accessibility, and structural stability on stainless steel substrate is a practical and scalable electrode for supercapacitor applications.

Graphical abstract