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<p>Nanometer-scale leaf-shaped copper oxide structures were synthesized on pure Cu foam using a low-temperature, eco-friendly hot water treatment (HWT) method at 75°C for 24&#xa0;h. CuO nanostructures formed a binder-free electrode for electrochemical testing. Scanning electron microscopy and energy dispersive spectroscopy analyzed the structure and composition, while X-ray diffraction confirmed the crystal structure of CuO. Electrochemical evaluations revealed a maximum specific capacitance of about 85.0 ± 10.1 F/g at 5&#xa0;mV/s scan rate in 1&#xa0;M Na<sub>2</sub>SO<sub>4</sub>, with a capacitance retention of 67% after 2000 cycles. These findings highlight the potential of CuO/Cu nanostructured foam for pseudo-supercapacitor applications.</p> Graphical abstract <p></p>

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Copper oxide nanostructures developed directly on copper foam via hot water treatment as a binder-free electrode in supercapacitors

  • 期刊论文

  • 发表日期：

    2026年2月9日

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  • Shanzida Haque,
  • Tansel Karabacak

摘要

Nanometer-scale leaf-shaped copper oxide structures were synthesized on pure Cu foam using a low-temperature, eco-friendly hot water treatment (HWT) method at 75°C for 24 h. CuO nanostructures formed a binder-free electrode for electrochemical testing. Scanning electron microscopy and energy dispersive spectroscopy analyzed the structure and composition, while X-ray diffraction confirmed the crystal structure of CuO. Electrochemical evaluations revealed a maximum specific capacitance of about 85.0 ± 10.1 F/g at 5 mV/s scan rate in 1 M Na2SO4, with a capacitance retention of 67% after 2000 cycles. These findings highlight the potential of CuO/Cu nanostructured foam for pseudo-supercapacitor applications.

Graphical abstract