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<p>Graphite oxide (GO) is a promising material with unique physicochemical properties with a highly attractive feature for a wide range of technological applications. The properties of GO can be tailored by functionalizing the material with interesting electroactive moieties. This work investigates the chemical functionalisation of GO using a catalytically well-known organometallic moiety, <i>i.e.,</i> N-heterocyclic carbene (NHC) copper complex, and its successful characterisation through spectroscopic techniques. Comprehensive characterisation using FT-IR, Raman spectroscopy, TGA, and SEM–EDX confirmed successful covalent functionalisation, along with increased lattice disorder, enhanced thermal stability, and uniform Cu distribution across the wrinkled GO sheets. Electrochemical studies using CV, EIS, GCD, and capacitance retention have revealed that the organometallic-functionalized GO could be a potential candidate for a supercapacitor application. Electrochemical studies demonstrated that the Cu-NHC functionalised GO exhibits significantly reduced charge transfer resistance (~ 4.8 Ω), fast ionic diffusion, and stable redox reversibility. The hybrid electrode delivered a specific capacitance of ~ 172 F/g with ~ 86% retention after 1000 cycles, surpassing reported CuO and GO-based counterparts. These results demonstrate a synergistic effect between GO and the Cu-NHC moiety, highlighting its potential for supercapacitor applications.</p>

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Facile synthesis of N-heterocyclic carbene-copper functionalized graphite oxide for high-energy density supercapacitor applications

  • 期刊论文

  • 发表日期：

    2026年5月12日

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  • Bony P. Joy,
  • Bavatharani Chokkiah,
  • Siva Kumar Srinivasan,
  • Saikh Mohammad Wabaidur,
  • Ragupathy Dhanasuraman,
  • Vittal B. Gudimetla

摘要

Graphite oxide (GO) is a promising material with unique physicochemical properties with a highly attractive feature for a wide range of technological applications. The properties of GO can be tailored by functionalizing the material with interesting electroactive moieties. This work investigates the chemical functionalisation of GO using a catalytically well-known organometallic moiety, i.e., N-heterocyclic carbene (NHC) copper complex, and its successful characterisation through spectroscopic techniques. Comprehensive characterisation using FT-IR, Raman spectroscopy, TGA, and SEM–EDX confirmed successful covalent functionalisation, along with increased lattice disorder, enhanced thermal stability, and uniform Cu distribution across the wrinkled GO sheets. Electrochemical studies using CV, EIS, GCD, and capacitance retention have revealed that the organometallic-functionalized GO could be a potential candidate for a supercapacitor application. Electrochemical studies demonstrated that the Cu-NHC functionalised GO exhibits significantly reduced charge transfer resistance (~ 4.8 Ω), fast ionic diffusion, and stable redox reversibility. The hybrid electrode delivered a specific capacitance of ~ 172 F/g with ~ 86% retention after 1000 cycles, surpassing reported CuO and GO-based counterparts. These results demonstrate a synergistic effect between GO and the Cu-NHC moiety, highlighting its potential for supercapacitor applications.