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<p>This study presents a comprehensive investigation into the synthesis, structural characteristics, and electrochemical performance of carbon-based materials engineered for advanced metal-ion hybrid supercapacitors. By strategically integrating metal-ion intercalation/deintercalation mechanisms with the rapid charge storage dynamics of electric double-layer capacitors (EDLCs), the developed hybrid capacitor achieves an optimal balance between high energy density and superior power capability. Carbon-based components serve as robust double-layer charge carriers, offering enhanced conductivity, structural stability, and long cycling durability crucial for high-performance storage systems. A combination of advanced analytical techniques including X-ray diffraction (XRD), field emission scanning electron microscopy (FE-SEM), high-resolution transmission electron microscopy (HR-TEM), Brunauer Emmett Teller (BET) analysis, X-ray photoelectron spectroscopy (XPS), and Fourier-transform infrared spectroscopy (FTIR) is employed to elucidate the material’s phase composition, morphology, pore structure, and surface chemistry. The optimized hybrid supercapacitor delivers an impressive specific capacitance of 973.33&#xa0;F g⁻¹ at 1&#xa0;A g⁻¹, along with excellent cycling stability, retaining 91.7% of its capacitance after 5000 charge–discharge cycles. The tailored design of carbon-based materials simultaneously promotes rapid ion diffusion and stable metal-ion storage. A synergistic hybrid configuration that provides significant performance enhancement compared to conventional EDLCs and pseudocapacitors.</p> Graphical abstract <p></p>

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Bio-waste–derived activated carbon coupled with MnO₂/NiO nanocomposite for enhanced supercapacitor performance

  • 期刊论文

  • 发表日期：

    2026年1月31日

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  • D. Sridhar,
  • S. Manikandan,
  • R. Gobi

摘要

This study presents a comprehensive investigation into the synthesis, structural characteristics, and electrochemical performance of carbon-based materials engineered for advanced metal-ion hybrid supercapacitors. By strategically integrating metal-ion intercalation/deintercalation mechanisms with the rapid charge storage dynamics of electric double-layer capacitors (EDLCs), the developed hybrid capacitor achieves an optimal balance between high energy density and superior power capability. Carbon-based components serve as robust double-layer charge carriers, offering enhanced conductivity, structural stability, and long cycling durability crucial for high-performance storage systems. A combination of advanced analytical techniques including X-ray diffraction (XRD), field emission scanning electron microscopy (FE-SEM), high-resolution transmission electron microscopy (HR-TEM), Brunauer Emmett Teller (BET) analysis, X-ray photoelectron spectroscopy (XPS), and Fourier-transform infrared spectroscopy (FTIR) is employed to elucidate the material’s phase composition, morphology, pore structure, and surface chemistry. The optimized hybrid supercapacitor delivers an impressive specific capacitance of 973.33 F g⁻¹ at 1 A g⁻¹, along with excellent cycling stability, retaining 91.7% of its capacitance after 5000 charge–discharge cycles. The tailored design of carbon-based materials simultaneously promotes rapid ion diffusion and stable metal-ion storage. A synergistic hybrid configuration that provides significant performance enhancement compared to conventional EDLCs and pseudocapacitors.

Graphical abstract