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<p>Supercapacitors have attracted considerable attention as energy preserving devices owing to their fast charge–discharge rates, long cycle life and high-power density. Despite these advantages, significant voltage drop remains a critical challenge, as it can diminish energy density and long-term stability, ultimately restricting the overall electrochemical performance and practical applicability of supercapacitor systems. To overcome these difficulties, researchers have discovered rGO-based MgCo<sub>2</sub>O<sub>4</sub> nanocomposite and adopted hydrothermal process to design an effective electrode substrate for supercapacitor. Addition of rGO in MgCo<sub>2</sub>O<sub>4</sub> improves electrical conductivity and electrochemical efficiency, making material favourable for supercapacitor applications. Materials were analysed using several physical characterisation methods, such as Brunauer-Emmett-Teller (BET) surface area study, X-ray diffraction (XRD) and scanning electron microscopy (SEM). Moreover, samples were also examined using various electrochemical tests. Electrochemical behaviour of nanocomposite is acquired within potential range of -0.15 to 0.75&#xa0;V vs. Ag/AgCl in 3&#xa0;M electrolyte (KOH). However, electrochemical studies indicated that specific capacitance (C<sub>s</sub>) of the MgCo<sub>2</sub>O<sub>4</sub>/rGO nanocomposite was measured at 2115&#xa0;F/g at 1&#xa0;A/g. Excellent C<sub>s</sub> of MgCo<sub>2</sub>O<sub>4</sub>/rGO correspond with improved surface area (SA) and higher conductivity observed because of overall effect of MgCo<sub>2</sub>O<sub>4</sub> and rGO. Furthermore, nanocomposite demonstrated power density (P<sub>d</sub>) of 425&#xa0;W/kg and energy density (E<sub>d</sub>) of 212 Wh/kg at 1&#xa0;A/g. MgCo<sub>2</sub>O<sub>4</sub>/rGO has lower solution resistance (R<sub>s</sub> = 0.91 Ω), leading to increased ion transport efficiency. Diverse stability studies revealed that MgCo<sub>2</sub>O<sub>4</sub>/rGO exhibited stabilization through 50&#xa0;h, with high durability after cycles of 3000<sup>th</sup>. Our findings show that the synthesised nanocomposite has amazing functionalization for tackling upcoming energy concerns.</p>

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Synthesis of rGO-based MgCo2O4 nanocomposite electrode for high-performance supercapacitors

  • 期刊论文

  • 发表日期：

    2026年8月4日

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  • Sanam Saeed,
  • Meznah M. Alanazi,
  • Shaimaa A.M. Abdelmohsen,
  • Hala M. Abo-Dief,
  • Eman Alzahrani,
  • Hussain Sawwan,
  • Waqas Ul Arifeen,
  • Muhammad Waqas,
  • Reda A. Haggam

摘要

Supercapacitors have attracted considerable attention as energy preserving devices owing to their fast charge–discharge rates, long cycle life and high-power density. Despite these advantages, significant voltage drop remains a critical challenge, as it can diminish energy density and long-term stability, ultimately restricting the overall electrochemical performance and practical applicability of supercapacitor systems. To overcome these difficulties, researchers have discovered rGO-based MgCo2O4 nanocomposite and adopted hydrothermal process to design an effective electrode substrate for supercapacitor. Addition of rGO in MgCo2O4 improves electrical conductivity and electrochemical efficiency, making material favourable for supercapacitor applications. Materials were analysed using several physical characterisation methods, such as Brunauer-Emmett-Teller (BET) surface area study, X-ray diffraction (XRD) and scanning electron microscopy (SEM). Moreover, samples were also examined using various electrochemical tests. Electrochemical behaviour of nanocomposite is acquired within potential range of -0.15 to 0.75 V vs. Ag/AgCl in 3 M electrolyte (KOH). However, electrochemical studies indicated that specific capacitance (Cs) of the MgCo2O4/rGO nanocomposite was measured at 2115 F/g at 1 A/g. Excellent Cs of MgCo2O4/rGO correspond with improved surface area (SA) and higher conductivity observed because of overall effect of MgCo2O4 and rGO. Furthermore, nanocomposite demonstrated power density (Pd) of 425 W/kg and energy density (Ed) of 212 Wh/kg at 1 A/g. MgCo2O4/rGO has lower solution resistance (Rs = 0.91 Ω), leading to increased ion transport efficiency. Diverse stability studies revealed that MgCo2O4/rGO exhibited stabilization through 50 h, with high durability after cycles of 3000th. Our findings show that the synthesised nanocomposite has amazing functionalization for tackling upcoming energy concerns.