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<p>The spark discharge method enables one-step in situ fabrication of the rGO/CuO nanocomposite (rCN). A graphite rod from a discarded battery was used to make reduced graphene oxide (rGO). The presence of rGO significantly alters the morphological, optical and structural properties of copper oxide. The addition of rGO reduces the mean size of crystallites, which improves crystallinity. By adding 0.05% and 0.2% rGO, the structural and crystallite diameters are lowered to 17 ± 0.20&#xa0;nm and 15 ± 0.20&#xa0;nm, respectively. Furthermore, the optical properties increase and the energy of the optical bandgap is lowered when compared to pure CuO. Furthermore, the synthesised nanocomposite has excellent electrochemical characteristics. The rCN nanocomposite has a specific capacitance of 237.46&#xa0;F/g and is a prospective energy source. The retention of specific capacitance at 0.2% rCN nanocomposite was evaluated by a cycle stability test performed at 2&#xa0;A/g for 5000 cycles. Pure CuO maintained its capacitance after 5000 cycles, however the current density 0.2% rCN nanocomposite maintained 98.17% of its specific capacitance, greater than the 85.50% retention of the CuO electrode.</p>

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One-step spark discharge synthesis of 2D structured rGO-CuO nanocomposite for energy storage

  • 期刊论文

  • 发表日期：

    2025年10月27日

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  • Naresh Prasad Choudhry,
  • Purushottam Kumar Singh,
  • Alok Kumar Das

摘要

The spark discharge method enables one-step in situ fabrication of the rGO/CuO nanocomposite (rCN). A graphite rod from a discarded battery was used to make reduced graphene oxide (rGO). The presence of rGO significantly alters the morphological, optical and structural properties of copper oxide. The addition of rGO reduces the mean size of crystallites, which improves crystallinity. By adding 0.05% and 0.2% rGO, the structural and crystallite diameters are lowered to 17 ± 0.20 nm and 15 ± 0.20 nm, respectively. Furthermore, the optical properties increase and the energy of the optical bandgap is lowered when compared to pure CuO. Furthermore, the synthesised nanocomposite has excellent electrochemical characteristics. The rCN nanocomposite has a specific capacitance of 237.46 F/g and is a prospective energy source. The retention of specific capacitance at 0.2% rCN nanocomposite was evaluated by a cycle stability test performed at 2 A/g for 5000 cycles. Pure CuO maintained its capacitance after 5000 cycles, however the current density 0.2% rCN nanocomposite maintained 98.17% of its specific capacitance, greater than the 85.50% retention of the CuO electrode.