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<p>The formation of competent and cost-effective electrode materials for energy conservation and conversion remains a serious challenge. In the present study, CoS<sub>2</sub>/Gd<sub>2</sub>S<sub>3</sub> dithiocarbamate-based nanocomposite is developed through a single-source driven approach and examined for electrocatalytic and supercapacitor applications. Morphological and optical studies displayed a crystalline nanostructure with an estimated crystalline size of 11&#xa0;nm and the optical band gap energy of 3.8&#xa0;eV. Similarly, metallic sulfide are identified using FT-IR spectroscopy in the 400–900&#xa0;cm<sup>−1</sup> range. The volume to surface area ratio increased as a result of the aggregation of nanorods as shown by morphological studies. Electrochemical behavior is examined using a three-electrode system in electrolytic solution (1M of KOH) within a potential range of 0 to 0.6&#xa0;V vs SCE. Cyclic voltammetry revealed pseudocapacitive behavior of fabricated electrode, yielding a specific capacitance of 741.4&#xa0;F/g. Galvanostatic charge-discharge test was performed at well-defined current density with estimated capacitance of 91.0&#xa0;F/g. Electrochemical impedance spectroscopy analysis revealed a low series resistance of 0.4&#xa0;Ω. The low series resistance value shows <i>R</i><sub><i>s</i></sub> = 0.4&#xa0;Ω revealing excellent charge transport kinetics and the fabricated electrode attained a power density of 1239.1&#xa0;W&#xa0;k/g. Electrocatalytic performance toward water splitting is examined in 0.1 M KOH electrolyte using LSV at a scan rate of 1&#xa0;mV&#xa0;s<sup>−1</sup>. The synthesized nanocomposite revealed an overpotential of 266&#xa0;mV for OER reaction with a Tafel slope of 100&#xa0;mV&#xa0;dec<sup>−1</sup>. Conversely, its HER activity exhibited an overpotential of 65 mV and a corresponding Tafel slope of 139&#xa0;mV&#xa0;dec<sup>−1</sup> confirming its bifunctional ability. The chronoamperometric stability analysis over 24 to 28&#xa0;h proved slight current degradation. These findings prominent the efficiency of the CoS<sub>2</sub>/Gd<sub>2</sub>S<sub>3</sub> dithiocarbamate nanocomplex as a bifunctional electrode material and proved as a competitive material for both supercapacitor and electrocatalytic applications under alkaline environment.</p>

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Single-Source Driven Synthesis of CoS2/Gd2S3-Dithiocarbamate Nanocomposite for High-Efficiency Supercapacitor and Bifunctional Water Splitting Applications

  • 期刊论文

  • 发表日期：

    2026年7月9日

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  • Laila Almanqur

摘要

The formation of competent and cost-effective electrode materials for energy conservation and conversion remains a serious challenge. In the present study, CoS2/Gd2S3 dithiocarbamate-based nanocomposite is developed through a single-source driven approach and examined for electrocatalytic and supercapacitor applications. Morphological and optical studies displayed a crystalline nanostructure with an estimated crystalline size of 11 nm and the optical band gap energy of 3.8 eV. Similarly, metallic sulfide are identified using FT-IR spectroscopy in the 400–900 cm−1 range. The volume to surface area ratio increased as a result of the aggregation of nanorods as shown by morphological studies. Electrochemical behavior is examined using a three-electrode system in electrolytic solution (1M of KOH) within a potential range of 0 to 0.6 V vs SCE. Cyclic voltammetry revealed pseudocapacitive behavior of fabricated electrode, yielding a specific capacitance of 741.4 F/g. Galvanostatic charge-discharge test was performed at well-defined current density with estimated capacitance of 91.0 F/g. Electrochemical impedance spectroscopy analysis revealed a low series resistance of 0.4 Ω. The low series resistance value shows Rs = 0.4 Ω revealing excellent charge transport kinetics and the fabricated electrode attained a power density of 1239.1 W k/g. Electrocatalytic performance toward water splitting is examined in 0.1 M KOH electrolyte using LSV at a scan rate of 1 mV s−1. The synthesized nanocomposite revealed an overpotential of 266 mV for OER reaction with a Tafel slope of 100 mV dec−1. Conversely, its HER activity exhibited an overpotential of 65 mV and a corresponding Tafel slope of 139 mV dec−1 confirming its bifunctional ability. The chronoamperometric stability analysis over 24 to 28 h proved slight current degradation. These findings prominent the efficiency of the CoS2/Gd2S3 dithiocarbamate nanocomplex as a bifunctional electrode material and proved as a competitive material for both supercapacitor and electrocatalytic applications under alkaline environment.