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<p>Electrode-active materials play a crucial role in determining the electrochemical performance of supercapacitors and supercapatteries (SCs). Transition metal disulfides have received great interest in the recent past due to their excellent charge storage capabilities. Herein, we report the facile synthesis of cobalt disulfide (CoS<sub>2</sub>)/polypyrrole (PPy) nanocomposites and their application as positrode in SCs. Initially, nanostructured CoS<sub>2</sub> with sheet-like morphology is synthesized by a microwave-assisted hydrothermal method in a short processing time of 30&#xa0;min. Further, CoS₂ is modified with PPy by a facile in-situ oxidative chemical polymerization method. The CoS<sub>2</sub>/PPy nanocomposite ensures a uniform distribution and enhances synergy between CoS<sub>2</sub> and PPy. The CoS<sub>2</sub>/PPy nanocomposite electrode achieves a maximum specific capacity of 259.28&#xa0;C/g at a scan rate of 10 mV/s. Kinetic studies of the CoS<sub>2</sub>/PPy nanocomposite electrode are carried out using Dunn’s method, unveils the charge storage mechanism is mainly diffusion-controlled. An asymmetric SC cell fabricated using a CoS<sub>2</sub>/PPy nanocomposite as positrode and activated carbon as negatrode possesses an energy density of 52.47 Wh/kg. The present work proclaims the development of electronically conducting polymers modified transition metal chalcogenides for potential use in energy storage devices.</p>

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Strategically-Designed Polypyrrole-Modified Cobalt Disulfide Electrodes for Supercapatteries with High Specific Capacity

  • 期刊论文

  • 发表日期：

    2025年9月9日

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  • Susmi Anna Thomas,
  • Jayesh Cherusseri,
  • Mohan Reddy Pallavolu,
  • Deepthi N. Rajendran

摘要

Electrode-active materials play a crucial role in determining the electrochemical performance of supercapacitors and supercapatteries (SCs). Transition metal disulfides have received great interest in the recent past due to their excellent charge storage capabilities. Herein, we report the facile synthesis of cobalt disulfide (CoS2)/polypyrrole (PPy) nanocomposites and their application as positrode in SCs. Initially, nanostructured CoS2 with sheet-like morphology is synthesized by a microwave-assisted hydrothermal method in a short processing time of 30 min. Further, CoS₂ is modified with PPy by a facile in-situ oxidative chemical polymerization method. The CoS2/PPy nanocomposite ensures a uniform distribution and enhances synergy between CoS2 and PPy. The CoS2/PPy nanocomposite electrode achieves a maximum specific capacity of 259.28 C/g at a scan rate of 10 mV/s. Kinetic studies of the CoS2/PPy nanocomposite electrode are carried out using Dunn’s method, unveils the charge storage mechanism is mainly diffusion-controlled. An asymmetric SC cell fabricated using a CoS2/PPy nanocomposite as positrode and activated carbon as negatrode possesses an energy density of 52.47 Wh/kg. The present work proclaims the development of electronically conducting polymers modified transition metal chalcogenides for potential use in energy storage devices.