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<p>In supercapacitor (SC) technology, advanced electrode materials are key to improving energy storage. Nickel compounds have been promising electrode materials for SC applications. Herein, the incorporation of zinc as a dopant/composite component with nickel has been investigated to enhance electrochemical properties of the nickel-based SC electrodes. In this study, Ni/Zn layered hydroxide (NZLH) electrodes were synthesized via microwave-assisted hydrothermal method with varying zinc ratios, alongside a pure nickel hydroxide reference. The incorporation of zinc has altered the electrochemical properties of NZLH electrodes without forming a distinct zinc hydroxide phase. NZ10 (with 10% Zn/Ni in the initial synthesis solution) has demonstrated the highest specific capacity with a value of 272.78 mAh/g at 5 A/g current density. The asymmetric SC device achieves a maximum specific capacity of 40.76 mAh/g at a current density of 0.1 A/g using activated carbon (anode) and NZ10 (cathode) materials. After 1000 cycles, the device exhibits excellent capacity retention and coulombic efficiency, recorded at 80.7% and 92.7%, respectively. The notable energy and power densities of 45.5 Wh/kg and 6400 W/kg at 2 A/g current density were measured for the asymmetric SC device in two-electrode system, indicating that the NZLH electrode may serve as a viable choice for energy storage applications.</p>

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Microwave-assisted hydrothermal synthesis and electrochemical energy storage behavior of Ni/Zn layered hydroxides for use in supercapacitor electrodes

  • 期刊论文

  • 发表日期：

    2025年9月9日

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  • Ahmad Luqman Che Rani,
  • Mohamed Ansari Mohamed Nainar,
  • Mohammad Yeganeh Ghotbi,
  • Teuku Muhammad Roffi,
  • Andika Widya Pramono,
  • Raja Viswanathan,
  • Muhammad Amirul Aizat Mohd Abdah,
  • Mohammad Khalid

摘要

In supercapacitor (SC) technology, advanced electrode materials are key to improving energy storage. Nickel compounds have been promising electrode materials for SC applications. Herein, the incorporation of zinc as a dopant/composite component with nickel has been investigated to enhance electrochemical properties of the nickel-based SC electrodes. In this study, Ni/Zn layered hydroxide (NZLH) electrodes were synthesized via microwave-assisted hydrothermal method with varying zinc ratios, alongside a pure nickel hydroxide reference. The incorporation of zinc has altered the electrochemical properties of NZLH electrodes without forming a distinct zinc hydroxide phase. NZ10 (with 10% Zn/Ni in the initial synthesis solution) has demonstrated the highest specific capacity with a value of 272.78 mAh/g at 5 A/g current density. The asymmetric SC device achieves a maximum specific capacity of 40.76 mAh/g at a current density of 0.1 A/g using activated carbon (anode) and NZ10 (cathode) materials. After 1000 cycles, the device exhibits excellent capacity retention and coulombic efficiency, recorded at 80.7% and 92.7%, respectively. The notable energy and power densities of 45.5 Wh/kg and 6400 W/kg at 2 A/g current density were measured for the asymmetric SC device in two-electrode system, indicating that the NZLH electrode may serve as a viable choice for energy storage applications.