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<p>Using cationic and anionic substitution reactions to precipitate different metal oxides to increase the capacitance can be a simple, fast, cheap, and very effective method. In this research, Graphite coin (GC) electrodes based on commercial graphite and Zn-metal powders were used as novel and inexpensive substrates to replace strontium and cobalt metals. This electrode offers several benefits, including reusability, cost effectiveness, reduced energy consumption, high capacitance, and high cyclic stability. The surface morphological investigation (FE-SEM) results showed that Co and Sr nanostructures with special honeycomb and cauliflower-like morphology are deposited on the GC electrode through substitution reactions without energy consumption. Also, the BET, XRD, and EDX analysis results confirmed the successful growth of Co and Sr nanostructure onto porous GC electrodes from substitution reactions. The results of the electrochemical investigation showed that the fabricated Co/Anodize Sr-PGC electrodes have an excellent capacitance of 6721.62 mF cm<sup>−2</sup> at 0.5 mA cm<sup>−2</sup> in 1M NaOH. Finally, the results of examining the capacitive behavior of the fabricated symmetric solid-state supercapacitor device with Co/Anodize Sr-PGC electrode showed that the constructed supercapacitor device has an excellent specific capacitive capacity of 177.5 mF/cm<sup>2</sup>, power, and energy density of 3035.25 mW/cm<sup>2</sup> and 84.31 mWh/cm<sup>2</sup> at 0.4 mA/cm<sup>2</sup>.</p>

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Fabrication of graphite coin electrode based on binary cobalt-strontium metals by substitution reaction method for symmetrical supercapacitor devices

  • 期刊论文

  • 发表日期：

    2025年1月30日

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  • Masoud Faraji,
  • Reza Dadashi,
  • Nima Mostafazadeh

摘要

Using cationic and anionic substitution reactions to precipitate different metal oxides to increase the capacitance can be a simple, fast, cheap, and very effective method. In this research, Graphite coin (GC) electrodes based on commercial graphite and Zn-metal powders were used as novel and inexpensive substrates to replace strontium and cobalt metals. This electrode offers several benefits, including reusability, cost effectiveness, reduced energy consumption, high capacitance, and high cyclic stability. The surface morphological investigation (FE-SEM) results showed that Co and Sr nanostructures with special honeycomb and cauliflower-like morphology are deposited on the GC electrode through substitution reactions without energy consumption. Also, the BET, XRD, and EDX analysis results confirmed the successful growth of Co and Sr nanostructure onto porous GC electrodes from substitution reactions. The results of the electrochemical investigation showed that the fabricated Co/Anodize Sr-PGC electrodes have an excellent capacitance of 6721.62 mF cm−2 at 0.5 mA cm−2 in 1M NaOH. Finally, the results of examining the capacitive behavior of the fabricated symmetric solid-state supercapacitor device with Co/Anodize Sr-PGC electrode showed that the constructed supercapacitor device has an excellent specific capacitive capacity of 177.5 mF/cm2, power, and energy density of 3035.25 mW/cm2 and 84.31 mWh/cm2 at 0.4 mA/cm2.