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<p>In this study, a nanocomposite-based electrocatalyst of CaCo₂O₄/CdS was synthesised via the hydrothermal method and systematically evaluated for supercapacitance and electrochemical hydrogen evolution reaction (HER). Structural characterisation carried out through XRD and TEM confirms the formation of CaCo₂O₄/CdS nanocomposite with an average particle size of 12&#xa0;nm. Further, SAED studies confirmed the successful formation of the nanocomposite, with distinct crystal planes at (001) and (100) corresponding to CaCo₂O₄ and CdS phases, respectively. Electrochemical analysis demonstrated excellent pseudocapacitive behaviour, with a specific capacitance of 834&#xa0;F g<sup>− 1</sup> (CV at 1 mV s<sup>− 1</sup>) and 302&#xa0;F g<sup>− 1</sup> (GCD at 1&#xa0;A g<sup>− 1</sup>). The prepared catalyst exhibited promising HER activity with overpotential of 213 mV at 10&#xa0;mA cm⁻² and Tafel slope of 178 mV dec<sup>− 1</sup>, indicating favorable kinetics. The electrochemically active surface area is found to be 148.5&#xa0;cm², reflecting adequate electrochemically active sites. Further, impedance studies revealed low charge transfer resistance of the nanocomposite, enabling high conductivity. These results highlight the CaCo₂O₄/CdS composite as a highly promising bifunctional electrocatalyst for clean and renewable energy applications.</p>

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Superior electrochemical performance of CaCo₂O₄/CdS nanocomposite for supercapacitor and hydrogen evolution reactions

  • 期刊论文

  • 发表日期：

    2025年12月23日

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  • Shivangini Singh,
  • Suranjana Mukherjee,
  • Manas Mandal,
  • Paramita Das,
  • Naveen Kumar Veldurthi,
  • Sudhanshu Pati

摘要

In this study, a nanocomposite-based electrocatalyst of CaCo₂O₄/CdS was synthesised via the hydrothermal method and systematically evaluated for supercapacitance and electrochemical hydrogen evolution reaction (HER). Structural characterisation carried out through XRD and TEM confirms the formation of CaCo₂O₄/CdS nanocomposite with an average particle size of 12 nm. Further, SAED studies confirmed the successful formation of the nanocomposite, with distinct crystal planes at (001) and (100) corresponding to CaCo₂O₄ and CdS phases, respectively. Electrochemical analysis demonstrated excellent pseudocapacitive behaviour, with a specific capacitance of 834 F g− 1 (CV at 1 mV s− 1) and 302 F g− 1 (GCD at 1 A g− 1). The prepared catalyst exhibited promising HER activity with overpotential of 213 mV at 10 mA cm⁻² and Tafel slope of 178 mV dec− 1, indicating favorable kinetics. The electrochemically active surface area is found to be 148.5 cm², reflecting adequate electrochemically active sites. Further, impedance studies revealed low charge transfer resistance of the nanocomposite, enabling high conductivity. These results highlight the CaCo₂O₄/CdS composite as a highly promising bifunctional electrocatalyst for clean and renewable energy applications.