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<p>Recent advancements in metal carbon nanocomposites have garnered significant attention for their potential in enhancing the electrochemical properties of supercapacitors. In this study, a cobalt phenanthroline complex and biphenyl were pyrolyzed with metal nitrates at 600&#xa0;°C to synthesize three distinct metal carbon nanocomposites: CoC/Co, CoC/Bi, and CoC/Ni. Energy-dispersive X-ray spectroscopy and X-ray diffraction analyses confirmed the presence of cobalt in all variants, with additional detection of bismuth and nickel in the CoC/Bi and CoC/Ni samples respectively. X-ray photoelectron spectroscopy further identified the existence of oxides, chlorides, carbonates, and nitrides of cobalt, bismuth, and nickel. Raman spectroscopy highlighted a singular cobalt oxide phase in the undoped CoC/Co and the formation of a Co<sub>3</sub>O<sub>4</sub> spinel structure in the doped samples. Transmission electron microscopy (TEM) showcased the formation of rectangular nanoparticles, ranging from 10 to 50&#xa0;nm in diameter. Catalytic testing revealed that CoC/Co displayed the highest turnover frequency for p-nitrophenol reduction, whereas CoC/Bi showed superior performance in reducing methyl orange. Moreover, the first-order rate constants indicated robust catalytic activity over multiple cycles, with CoC/Co and CoC/Bi excelling in their respective reactions. Electrochemical evaluations using cyclic voltammetry and galvanic charge-discharge techniques in a three-electrode cell with KOH solution demonstrated that the CoC/Ni electrode possessed the highest specific capacitance (1024.0&#xa0;F/g) and maintained excellent stability (90.0%) across numerous cycles. This study confirms that nickel doping significantly boosts electrical storage capabilities, positioning CoC/Ni as an ideal candidate for advanced supercapacitor applications.</p> Graphical Abstract <p></p>

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Synergistic Effects of Bismuth, Cobalt, and Nickel on Cobalt-Carbon Nanocomposites for Catalytic Reduction and Supercapacitor Applications

  • 期刊论文

  • 发表日期：

    2025年4月24日

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  • Hassan H. Hammud,
  • Waleed A. Aljamhi,
  • Dolayl E. Al-Hudairi,
  • Nazish Parveen,
  • Sajid Ali Ansari,
  • Javed Mazher,
  • Mohamed Shaker S. Adam,
  • Thirumurugan Prakasam

摘要

Recent advancements in metal carbon nanocomposites have garnered significant attention for their potential in enhancing the electrochemical properties of supercapacitors. In this study, a cobalt phenanthroline complex and biphenyl were pyrolyzed with metal nitrates at 600 °C to synthesize three distinct metal carbon nanocomposites: CoC/Co, CoC/Bi, and CoC/Ni. Energy-dispersive X-ray spectroscopy and X-ray diffraction analyses confirmed the presence of cobalt in all variants, with additional detection of bismuth and nickel in the CoC/Bi and CoC/Ni samples respectively. X-ray photoelectron spectroscopy further identified the existence of oxides, chlorides, carbonates, and nitrides of cobalt, bismuth, and nickel. Raman spectroscopy highlighted a singular cobalt oxide phase in the undoped CoC/Co and the formation of a Co3O4 spinel structure in the doped samples. Transmission electron microscopy (TEM) showcased the formation of rectangular nanoparticles, ranging from 10 to 50 nm in diameter. Catalytic testing revealed that CoC/Co displayed the highest turnover frequency for p-nitrophenol reduction, whereas CoC/Bi showed superior performance in reducing methyl orange. Moreover, the first-order rate constants indicated robust catalytic activity over multiple cycles, with CoC/Co and CoC/Bi excelling in their respective reactions. Electrochemical evaluations using cyclic voltammetry and galvanic charge-discharge techniques in a three-electrode cell with KOH solution demonstrated that the CoC/Ni electrode possessed the highest specific capacitance (1024.0 F/g) and maintained excellent stability (90.0%) across numerous cycles. This study confirms that nickel doping significantly boosts electrical storage capabilities, positioning CoC/Ni as an ideal candidate for advanced supercapacitor applications.

Graphical Abstract