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<p>Copper oxide (CuO) thin films were successfully prepared by electrodeposition and hydrothermal techniques to explore their structural, morphological, and electrochemical properties for catalytic use. The electrodeposited films showed dense and homogeneous morphologies with high substrate adhesion, whereas the hydrothermal process yielded hierarchical nanostructures with increased surface area. X-ray diffraction analysis confirmed the purity of the CuO phase, and UV-Vis diffuse reflectance spectroscopy showed a reduced band gap of 1.214&#xa0;eV for hydrothermally synthesized CuO, which is beneficial for efficient charge carrier transport. Scanning electron microscopy analysis revealed that hydrothermally synthesized CuO had a very porous structure, which is conducive to high electrocatalytic activity. Electrochemical analysis showed that hydrothermally synthesized CuO had the lowest overpotential of 540 mV (vs. RHE) at 10&#xa0;mA/cm<sup>2</sup> and a lower Tafel slope of 65.2 mV/dec, along with improved durability of up to 11&#xa0;h. The enhanced oxygen evolution reaction (OER) performance is ascribed to the high crystallinity, increased active surface area, and improved charge transfer rate of hydrothermally synthesized CuO. These results clearly demonstrate the effectiveness of the hydrothermal process for preparing CuO-based catalysts for OER and renewable energy conversion.</p>

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A Comparative Study of CuO Nanoparticles for OER by Using Water Splitting Reaction: Electrodeposition and Hydrothermal Method

  • 期刊论文

  • 发表日期：

    2026年5月21日

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  • Ashwini Pol,
  • Puja Deshmukh,
  • Pratik Sutar,
  • Anamika V. Kadam

摘要

Copper oxide (CuO) thin films were successfully prepared by electrodeposition and hydrothermal techniques to explore their structural, morphological, and electrochemical properties for catalytic use. The electrodeposited films showed dense and homogeneous morphologies with high substrate adhesion, whereas the hydrothermal process yielded hierarchical nanostructures with increased surface area. X-ray diffraction analysis confirmed the purity of the CuO phase, and UV-Vis diffuse reflectance spectroscopy showed a reduced band gap of 1.214 eV for hydrothermally synthesized CuO, which is beneficial for efficient charge carrier transport. Scanning electron microscopy analysis revealed that hydrothermally synthesized CuO had a very porous structure, which is conducive to high electrocatalytic activity. Electrochemical analysis showed that hydrothermally synthesized CuO had the lowest overpotential of 540 mV (vs. RHE) at 10 mA/cm2 and a lower Tafel slope of 65.2 mV/dec, along with improved durability of up to 11 h. The enhanced oxygen evolution reaction (OER) performance is ascribed to the high crystallinity, increased active surface area, and improved charge transfer rate of hydrothermally synthesized CuO. These results clearly demonstrate the effectiveness of the hydrothermal process for preparing CuO-based catalysts for OER and renewable energy conversion.