| Texto completo | |
| Autor(es): |
Franco, Jefferson Honorio
;
Bonaldo, Joao Victor
;
Minteer, Shelley D.
;
De Andrade, Adalgisa R.
Número total de Autores: 4
|
| Tipo de documento: | Artigo Científico |
| Fonte: | BIOSENSORS & BIOELECTRONICS; v. 216, p. 9-pg., 2022-08-30. |
| Resumo | |
We report an Enzymatic Fuel Cell (EFC) combining an enzyme that can cleave carbon-carbon bonds (oxalate oxidase (OxOx)) with an organic catalyst (Pyrene-TEMPO (TEMPO = 2,2,6,6-tetramethyl piperidinyl-N-oxyl)) immobilized on the surface of modified carboxylated multi-walled carbon nanotubes (MWCNT-COOH). This combination gave a hybrid bi-catalyst electrode for complete ethylene glycol (EG) oxidation. The hybrid electrode provided ninefold enhanced catalytic activity (0.17 +/- 6 x 10-3 mA cm(-2)) in the presence of EG as compared to the electrode in the absence of EG (0.018 & PLUSMN; 3 x 10-5 mA cm-2), indicating that the enzyme combined with the organic catalyst improved energy generation through deep EG electrooxidation. Electro-chemical impedance spectroscopy reveals that the addition of the enzyme in the electrode containing MWCNT-COOH-Pyrene-TEMPO increased the charge transfer resistance (Rct) and the capacitance of the double layer. Long-term electrolysis for 15 h showed that the hybrid electrode presented outstanding current density and stability. The EG oxidation products were identified and quantified by high-performance liquid chromatography (HPLC-UV/RID). The results confirmed complete EG oxidation in the presence of CO2 in the solution, allowing 10 electrons to be collected from the fuel. Overall, this study illustrates the development of a simple and improved hybrid bi-catalyst electrode for promising applications in small electronic devices. (AU) | |
| Processo FAPESP: | 18/24180-1 - Preparação de arquitetura multi-catalítica híbrida contendo enzima, catalisador orgânico e nanotubos de carbono modificados para a oxidação eletroquímica completa de etanol |
| Beneficiário: | Jefferson Honorio Franco |
| Modalidade de apoio: | Bolsas no Exterior - Estágio de Pesquisa - Pós-Doutorado |
| Processo FAPESP: | 17/20431-7 - Desenvolvimento de uma cascata enzimática híbrida para a produção de biocélula etanol/O2 eficiente |
| Beneficiário: | Jefferson Honorio Franco |
| Modalidade de apoio: | Bolsas no Brasil - Pós-Doutorado |