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<p>This study presents a novel approach to enhance supercapacitor performance by designing metal ions co-doped transition metal oxides as electrode materials. A facile wet chemical synthesis method was employed to fabricate undoped, Cd-doped, W-doped, and Cd, W co-doped ZnO nanorods. Characterization techniques such as XRD, HRTEM, XPS, EDX, FESEM and BET analyses were used to confirm successful co-doping through the evaluation of structure, morphology, elemental composition and surface topography of the synthesized samples. Optical properties were investigated using UV-Visible absorption spectroscopy and PL studies. Electrochemical testing was carried out in ZnO, CZO, WZO and CWZO nanorods by employing Cyclic voltammetry (CV), Galvanostatic charge-discharge (GCD), Electrochemical impedance spectroscopy (EIS) and Cycling stability analyses. Among the four electrodes, CWZO nanorods have yielded a high specific capacitance of 520.62 Fg<sup>− 1</sup> at 10 mVs<sup>− 1</sup> scan rate with reduced charge transfer resistance (Rct) that retained 89% of its capacitance and 97% of coulombic efficiency even after 1000 GCD cycles. It also possessed a very high energy density of 102.97 Wh kg<sup>− 1</sup> and an equally elevated power density of 4.23&#xa0;kW kg<sup>− 1</sup>, a benchmark value ever reported for a transition metals co-doped metal oxide nanostructure. Additionally, the CWZO nanorod demonstrated significant antibacterial activity with maximum zone of inhibition against <i>E.Coli</i>. This study introduced a novel Cd, W co-doped ZnO material with high specific capacitance, extended cycle life, and exceptionally high energy and power densities making it suitable for energy storage and power devising purposes.</p>

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Structural, optical and electrochemical investigations of Cd and W co-Doped ZnO nanorods for supercapacitor applications

  • 期刊论文

  • 发表日期：

    2026年3月13日

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  • P. Parvathy,
  • R. Ganapathi Raman,
  • V. N. Meena Devi

摘要

This study presents a novel approach to enhance supercapacitor performance by designing metal ions co-doped transition metal oxides as electrode materials. A facile wet chemical synthesis method was employed to fabricate undoped, Cd-doped, W-doped, and Cd, W co-doped ZnO nanorods. Characterization techniques such as XRD, HRTEM, XPS, EDX, FESEM and BET analyses were used to confirm successful co-doping through the evaluation of structure, morphology, elemental composition and surface topography of the synthesized samples. Optical properties were investigated using UV-Visible absorption spectroscopy and PL studies. Electrochemical testing was carried out in ZnO, CZO, WZO and CWZO nanorods by employing Cyclic voltammetry (CV), Galvanostatic charge-discharge (GCD), Electrochemical impedance spectroscopy (EIS) and Cycling stability analyses. Among the four electrodes, CWZO nanorods have yielded a high specific capacitance of 520.62 Fg− 1 at 10 mVs− 1 scan rate with reduced charge transfer resistance (Rct) that retained 89% of its capacitance and 97% of coulombic efficiency even after 1000 GCD cycles. It also possessed a very high energy density of 102.97 Wh kg− 1 and an equally elevated power density of 4.23 kW kg− 1, a benchmark value ever reported for a transition metals co-doped metal oxide nanostructure. Additionally, the CWZO nanorod demonstrated significant antibacterial activity with maximum zone of inhibition against E.Coli. This study introduced a novel Cd, W co-doped ZnO material with high specific capacitance, extended cycle life, and exceptionally high energy and power densities making it suitable for energy storage and power devising purposes.