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<p>In this study, the influence of deposition potential on the morphology, microstructure, and hydrogen evolution reaction (HER) catalytic activities of Cu<sub>2</sub>O nanostructures was investigated. These nanostructures were deposited on conductive FTO substrates via electrodeposition in a solution containing copper sulfate as a precursor at a temperature of 65&#xa0;°C and pH ~ 12. X-ray diffraction (XRD) patterns showed that the Cu<sub>2</sub>O nanostructures were polycrystalline in nature, with highly oriented cubic (111) crystallites. Scanning electron microscopy (SEM) images indicated that the morphology of the Cu<sub>2</sub>O films changed from granular to cubic as the applied potential increased. The Mott-Schottky (M-S)&#xa0;curve showed that each of the films was a p-type semiconductor with a carrier density ranging from 1.99 × 10<sup>20</sup> to 8.99 × 10<sup>19</sup>&#xa0;cm<sup>−3</sup>. These experiments also demonstrated that Cu<sub>2</sub>O prepared at −0.4&#xa0;V exhibited much greater catalytic activity compared to those prepared at higher potential (−0.5 and −0.6&#xa0;V). In 0.1&#xa0;M Na<sub>2</sub>SO<sub>4</sub> solution, the thin film showed a lower overpotential of −368&#xa0;mV and a smaller Tafel slope of 257&#xa0;mV dec<sup>−1</sup>. Electrochemical impedance spectroscopy also demonstrated that the Cu<sub>2</sub>O thin film deposited at −0.4&#xa0;V vs. Ag/AgCl had the largest electrochemically active surface area (ECSA) and double-layer capacitance (C<sub>dl</sub>) which resulted in its outstanding HER performance. This work aims to assist in the development of Cu<sub>2</sub>O beyond its intrinsic limitations for applications in the hydrogen evolution reaction.</p>

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Electrocatalytic activity of Cu2O nanostructures for hydrogen evolution reaction in neutral medium

  • 期刊论文

  • 发表日期：

    2025年11月10日

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  • Imene Abid,
  • Mohamed Redha Khelladi,
  • Yazid Messaoudi,
  • Hamza Belhadj,
  • Amor Azizi

摘要

In this study, the influence of deposition potential on the morphology, microstructure, and hydrogen evolution reaction (HER) catalytic activities of Cu2O nanostructures was investigated. These nanostructures were deposited on conductive FTO substrates via electrodeposition in a solution containing copper sulfate as a precursor at a temperature of 65 °C and pH ~ 12. X-ray diffraction (XRD) patterns showed that the Cu2O nanostructures were polycrystalline in nature, with highly oriented cubic (111) crystallites. Scanning electron microscopy (SEM) images indicated that the morphology of the Cu2O films changed from granular to cubic as the applied potential increased. The Mott-Schottky (M-S) curve showed that each of the films was a p-type semiconductor with a carrier density ranging from 1.99 × 1020 to 8.99 × 1019 cm−3. These experiments also demonstrated that Cu2O prepared at −0.4 V exhibited much greater catalytic activity compared to those prepared at higher potential (−0.5 and −0.6 V). In 0.1 M Na2SO4 solution, the thin film showed a lower overpotential of −368 mV and a smaller Tafel slope of 257 mV dec−1. Electrochemical impedance spectroscopy also demonstrated that the Cu2O thin film deposited at −0.4 V vs. Ag/AgCl had the largest electrochemically active surface area (ECSA) and double-layer capacitance (Cdl) which resulted in its outstanding HER performance. This work aims to assist in the development of Cu2O beyond its intrinsic limitations for applications in the hydrogen evolution reaction.