Copper complex containing N-acylhydrazone bulk-modified carbon paste electrode as a catalyst in ethanol electro-oxidation reaction
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.
Authors
- Joel dos Santos Batista
- Anyele Ramos da Silva
- Andreza Miranda Barata da Silva (ORCID: https://orcid.org/0000-0001-8738-4286)
- José Wilmo da Cruz Júnior (ORCID: https://orcid.org/0000-0001-7063-8980)
- Daniela Corrêa Santos (ORCID: https://orcid.org/0000-0002-9447-6549)
- Paulo José Sousa Maia (ORCID: https://orcid.org/0000-0003-3101-3712)
- Andréa Luzia F. de Souza (ORCID: https://orcid.org/0000-0001-8016-781X)
- Daniele Scheles Rosa da Silva
- L. Müller (ORCID: https://orcid.org/0000-0001-8263-7168)
- Jocely de Lucena Dutra
Institutions
- Universidade Federal do Rio de Janeiro (BR)
- Universidade Federal de São Carlos (BR)
- Universidade Federal de Santa Catarina (BR)
- Universidade Regional de Blumenau (BR)
- Universidade de Sorocaba (BR)
- Universidade Federal do Amazonas (BR)
- Universidade Federal do Estado do Rio de Janeiro (BR)
Publication Details
- Journal
- Discover Electrochemistry.
- Published
- 2025-11-29
- DOI
- https://doi.org/10.1007/s44373-025-00068-0
- Primary Topic
- Oxidative Organic Chemistry Reactions
- Type
- article
- Field-Weighted Citation Impact
- 0.00
Funders
- Universidade Federal do Amazonas
- Coordenação de Aperfeiçoamento de Pessoal de Nível Superior
- Conselho Nacional de Desenvolvimento Científico e Tecnológico
- Fundação Carlos Chagas Filho de Amparo à Pesquisa do Estado do Rio de Janeiro
- Fundação de Amparo à Pesquisa do Estado do Amazonas