Synergistic Effects of Bismuth, Cobalt, and Nickel on Cobalt-Carbon Nanocomposites for Catalytic Reduction and Supercapacitor Applications.
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| Title: | Synergistic Effects of Bismuth, Cobalt, and Nickel on Cobalt-Carbon Nanocomposites for Catalytic Reduction and Supercapacitor Applications. |
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| Authors: | Hammud, Hassan H.1 (AUTHOR) hhammoud@kfu.edu.sa, Aljamhi, Waleed A.1 (AUTHOR), Al-Hudairi, Dolayl E.1 (AUTHOR), Parveen, Nazish1 (AUTHOR) nislam@kfu.edu.sa, Ansari, Sajid Ali2 (AUTHOR), Mazher, Javed2 (AUTHOR) jkhan@kfu.edu.sa, Adam, Mohamed Shaker S.1 (AUTHOR), Prakasam, Thirumurugan3 (AUTHOR) |
| Source: | Topics in Catalysis. Feb2026, Vol. 69 Issue 4-7, p487-514. 28p. |
| Subjects: | Nanocomposite materials, Catalytic reduction, Supercapacitors, Electrochemical analysis, Bismuth, Cobalt, Nickel |
| Abstract: | 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. [ABSTRACT FROM AUTHOR] |
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| Database: | Engineering Source |
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| Abstract: | 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. [ABSTRACT FROM AUTHOR] |
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| ISSN: | 10225528 |
| DOI: | 10.1007/s11244-025-02092-1 |
