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<p>This study reports the electrocatalytic performance of a copper(II) <i>N</i>-acylhydrazone complex, dichlorido-<i>bis[</i>2-(4-dimethylaminophenyl)methylene]hydrazide copper(II), supported on carbon paste electrodes (Cu-CPE). The complex was synthesized and characterized by FTIR, CHN analysis, <sup>1</sup>H NMR, UV/Vis, and thermogravimetric analysis. Electrochemical tests in acidic ethanol solution revealed that Cu-CPE electrodes exhibit significantly enhanced current responses compared to bare CPE. While the unmodified CPE displayed a current density of approximately 0.45&#xa0;mA&#xa0;cm<sup>−2</sup> and Cu-CPE 5% reached 1.10&#xa0;mA&#xa0;cm<sup>−2</sup>, the Cu-CPE 30% electrode achieved 3.95&#xa0;mA&#xa0;cm<sup>−2</sup>, corresponding to nearly a nine-fold increase over bare CPE and a 3.6-fold enhancement relative to Cu-CPE 5%. These results demonstrate that higher catalyst loading provides superior activity toward ethanol electro-oxidation. Overall, the findings highlight the potential of copper–<i>N</i>-acylhydrazone complexes as cost-effective catalysts for the electro-oxidation of ethanol.</p>

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Copper complex containing N-acylhydrazone bulk-modified carbon paste electrode as a catalyst in ethanol electro-oxidation reaction

  • 期刊论文

  • 出版模式：

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  • 发表日期：

    2025年11月29日

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  • Daniele Scheles Rosa da Silva,
  • Daniela Corrêa Santos,
  • Jocely de Lucena Dutra,
  • Anyele Ramos da Silva,
  • Andreza Miranda Barata da Silva,
  • Laura Marina Müller,
  • Joel dos Santos Batista,
  • José Wilmo da Cruz Júnior,
  • Andréa Luzia Ferreira de Souza,
  • Paulo José Sousa Maia

摘要

This study reports the electrocatalytic performance of a copper(II) N-acylhydrazone complex, dichlorido-bis[2-(4-dimethylaminophenyl)methylene]hydrazide copper(II), supported on carbon paste electrodes (Cu-CPE). The complex was synthesized and characterized by FTIR, CHN analysis, 1H NMR, UV/Vis, and thermogravimetric analysis. Electrochemical tests in acidic ethanol solution revealed that Cu-CPE electrodes exhibit significantly enhanced current responses compared to bare CPE. While the unmodified CPE displayed a current density of approximately 0.45 mA cm−2 and Cu-CPE 5% reached 1.10 mA cm−2, the Cu-CPE 30% electrode achieved 3.95 mA cm−2, corresponding to nearly a nine-fold increase over bare CPE and a 3.6-fold enhancement relative to Cu-CPE 5%. These results demonstrate that higher catalyst loading provides superior activity toward ethanol electro-oxidation. Overall, the findings highlight the potential of copper–N-acylhydrazone complexes as cost-effective catalysts for the electro-oxidation of ethanol.