Exploring the stability and catalytic activity of monoethanolamine functionalized CuO electrode in electrochemical CO₂ reduction

Autor(es)

de Almeida, Jessica C. ; Lopes, Osmando F. ; Shviro, Meital ; da Silva, Gelson T. S. T. ; Ribeiro, Caue ; de Mendonca, Vagner R.

• Tipo de documento: Artigo Científico
• Fonte: NANOSCALE; v. 16, n. 39, p. 13-pg., 2024-09-05.

Resumo

Electrochemical carbon dioxide reduction reactions (eCO(2)RR) have emerged as promising strategies for both mitigating CO2 emissions and converting them into valuable products. Despite the promise, challenges such as stability, efficiency, and availability of CO2 on the electrode surface, especially at high current densities, still need to be overcome. Herein, this study explores the precipitation of CuO nanoparticles with monoethanolamine to preserve nitrogen groups on the surface of the material. These groups can act by adsorbing the CO2 and stabilizing its catalytic performance during the electroreduction procedure. The incorporation of monoethanolamine as functionalization on the surface of the CuO catalyst was confirmed by XPS measurements. Electrodes utilizing the S-MEA catalyst demonstrated enhanced electrochemical activity, achieving a current density of -187 mA cm(-2) at a half-cell potential of -1.2 V versus RHE. Furthermore, long-term stability tests confirmed consistent activity for at least 100 hours in both flow cell and zero gap cell configurations. These results indicate that electrodes featuring the S-MEA catalyst display notably superior electrochemical activity and stability compared with the non-functionalized CuO (S-KOH) and commercial CuO nanopowder (c-CuO). The S-MEA enhancement is attributed to the introduction of amine functional groups that serve as CO2 adducts, facilitating CO2 adsorption and fostering electrode activation. It was evidenced by higher current densities and improved structural integrity during prolonged tests. The insights gained from the comparative performance of these electrodes provide valuable directions for future research in developing more robust and efficient catalysts for environmental remediation technologies. (AU)

• Processo FAPESP: 18/01258-5 - Novos processos catalíticos e fotocatalíticos para a conversão direta de metano e CO2 em produtos
• Beneficiário: José Maria Correa Bueno
• Modalidade de apoio: Auxílio à Pesquisa - Temático
• Processo FAPESP: 13/07296-2 - CDMF - Centro de Desenvolvimento de Materiais Funcionais
• Beneficiário: Elson Longo da Silva
• Modalidade de apoio: Auxílio à Pesquisa - Centros de Pesquisa, Inovação e Difusão - CEPIDs
• Processo FAPESP: 23/10268-2 - Desenvolvimento de catalisadores a base de fosfetos metálico para eletroredução seletiva e eficiente de CO2
• Beneficiário: Gelson Tiago dos Santos Tavares da Silva
• Modalidade de apoio: Bolsas no Exterior - Estágio de Pesquisa - Pós-Doutorado
• Processo FAPESP: 22/10255-5 - Arquiteturas baseadas em fosfetos e nitretos metálicos para conversão foto(eletro)química de CO2 em compostos C2+
• Beneficiário: Gelson Tiago dos Santos Tavares da Silva
• Modalidade de apoio: Bolsas no Brasil - Pós-Doutorado
• Processo FAPESP: 22/01787-3 - Síntese de heteroestruturas à base de CuO para aplicação em fotocatálise heterogênea
• Beneficiário: Letícia Vieira Savazi
• Modalidade de apoio: Bolsas no Brasil - Iniciação Científica