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<p>The development of energy storage devices depends on the selection of cathode materials with exceptional electrochemical properties and a distinctive structure. Because of their large specific surface area and tunable pore structure for ion diffusion, metal–organic frameworks (MOFs) have attracted a lot of attention in the field of high-performance supercapacitors. Here, we demonstrate the simple <i>in-situ</i> chemical synthesis of a nanocomposite with core–shell SnO<sub>2</sub>@zeolite imidazolate framework-8 (SnO<sub>2</sub>@ZIF-8). X-ray diffraction (XRD), Fourier transform infrared (FTIR), Scanning electron microscopy with energy-dispersive X-ray spectrum (SEM–EDS), and high-resolution transmission electron microscopy (HR-TEM) have been used to characterize the core–shell nanocomposite. In the three-electrode system, the synthesized core–shell structure demonstrated outstanding electrochemical characteristics. In redox additive electrolytes (RAE), the SnO₂@ZIF-8 composite demonstrated a specific capacitance of 520.69 F/g at a current density of 5 A/g. After 5000 cycles of charging and discharging, KOH and RAE has&#xa0;retained their capacitance retention&#xa0;at 66.03% and 74.91%, respectively.</p>

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SnO₂@ZIF-8 Core–shell structured nanocrystallites: Structural and Electrochemical investigation

  • 期刊论文

  • 发表日期：

    2025年6月3日

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  • M. Renugadevi,
  • N. Meenakshi Sundaram,
  • V. Siva,
  • A. Murugan

摘要

The development of energy storage devices depends on the selection of cathode materials with exceptional electrochemical properties and a distinctive structure. Because of their large specific surface area and tunable pore structure for ion diffusion, metal–organic frameworks (MOFs) have attracted a lot of attention in the field of high-performance supercapacitors. Here, we demonstrate the simple in-situ chemical synthesis of a nanocomposite with core–shell SnO2@zeolite imidazolate framework-8 (SnO2@ZIF-8). X-ray diffraction (XRD), Fourier transform infrared (FTIR), Scanning electron microscopy with energy-dispersive X-ray spectrum (SEM–EDS), and high-resolution transmission electron microscopy (HR-TEM) have been used to characterize the core–shell nanocomposite. In the three-electrode system, the synthesized core–shell structure demonstrated outstanding electrochemical characteristics. In redox additive electrolytes (RAE), the SnO₂@ZIF-8 composite demonstrated a specific capacitance of 520.69 F/g at a current density of 5 A/g. After 5000 cycles of charging and discharging, KOH and RAE has retained their capacitance retention at 66.03% and 74.91%, respectively.