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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.
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]
Copyright of Topics in Catalysis is the property of Springer Nature and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)
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  Data: Synergistic Effects of Bismuth, Cobalt, and Nickel on Cobalt-Carbon Nanocomposites for Catalytic Reduction and Supercapacitor Applications.
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  Data: <searchLink fieldCode="AR" term="%22Hammud%2C+Hassan+H%2E%22">Hammud, Hassan H.</searchLink><relatesTo>1</relatesTo> (AUTHOR)<i> hhammoud@kfu.edu.sa</i><br /><searchLink fieldCode="AR" term="%22Aljamhi%2C+Waleed+A%2E%22">Aljamhi, Waleed A.</searchLink><relatesTo>1</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Al-Hudairi%2C+Dolayl+E%2E%22">Al-Hudairi, Dolayl E.</searchLink><relatesTo>1</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Parveen%2C+Nazish%22">Parveen, Nazish</searchLink><relatesTo>1</relatesTo> (AUTHOR)<i> nislam@kfu.edu.sa</i><br /><searchLink fieldCode="AR" term="%22Ansari%2C+Sajid+Ali%22">Ansari, Sajid Ali</searchLink><relatesTo>2</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Mazher%2C+Javed%22">Mazher, Javed</searchLink><relatesTo>2</relatesTo> (AUTHOR)<i> jkhan@kfu.edu.sa</i><br /><searchLink fieldCode="AR" term="%22Adam%2C+Mohamed+Shaker+S%2E%22">Adam, Mohamed Shaker S.</searchLink><relatesTo>1</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Prakasam%2C+Thirumurugan%22">Prakasam, Thirumurugan</searchLink><relatesTo>3</relatesTo> (AUTHOR)
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  Data: <searchLink fieldCode="DE" term="%22Nanocomposite+materials%22">Nanocomposite materials</searchLink><br /><searchLink fieldCode="DE" term="%22Catalytic+reduction%22">Catalytic reduction</searchLink><br /><searchLink fieldCode="DE" term="%22Supercapacitors%22">Supercapacitors</searchLink><br /><searchLink fieldCode="DE" term="%22Electrochemical+analysis%22">Electrochemical analysis</searchLink><br /><searchLink fieldCode="DE" term="%22Bismuth%22">Bismuth</searchLink><br /><searchLink fieldCode="DE" term="%22Cobalt%22">Cobalt</searchLink><br /><searchLink fieldCode="DE" term="%22Nickel%22">Nickel</searchLink>
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  Label: Abstract
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  Data: 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]
– Name: AbstractSuppliedCopyright
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  Data: <i>Copyright of Topics in Catalysis is the property of Springer Nature and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract.</i> (Copyright applies to all Abstracts.)
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        Value: 10.1007/s11244-025-02092-1
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        Text: English
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        PageCount: 28
        StartPage: 487
    Subjects:
      – SubjectFull: Nanocomposite materials
        Type: general
      – SubjectFull: Catalytic reduction
        Type: general
      – SubjectFull: Supercapacitors
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      – SubjectFull: Bismuth
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      – SubjectFull: Cobalt
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      – SubjectFull: Nickel
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