Enhanced electrochemical oxidation of ethanol using a hybrid catalyst cascade architecture containing pyrene-TEMPO, oxalate decarboxylase and carboxylated multi-walled carbon nanotube

Autor(es)

Franco, Jefferson Honorio ^{[1, 2]} ; Klunder, Kevin J. ^[1] ; Lee, Jack ^[1] ; Russell, Victoria ^[1] ; de Andrade, Adalgisa R. ^[2] ; Minteer, Shelley D. ^[1]

Afiliação do(s) autor(es)

^[1] Univ Utah, Dept Chem, Salt Lake City, UT 84112 - USA

^[2] Univ Sao Paulo, Fac Philosophy Sci & Letters Ribeirao Preto, Dept Chem, BR-14040901 Ribeirao Preto, SP - Brazil

• Tipo de documento: Artigo Científico
• Fonte: BIOSENSORS & BIOELECTRONICS; v. 154, APR 15 2020.
• Citações Web of Science: 0

Resumo

The work presented herein demonstrates a hybrid bi-catalytic architecture for the complete electrochemical oxidation of ethanol. The new catalytic system contains pyrene-TEMPO (TEMPO = 2,2,6,6-tetramethylpiperidinyl-N-oxyl) immobilized on the surface of carboxylated multi-walled carbon nanotubes (MWCNT-COOH), and oxalate decarboxylase enzyme (OxDc) immobilized onto a carbon cloth electrode. Electrolysis revealed a stable amperometric curve and an excellent current density value over a duration of 10 h. In addition, the hybrid system immobilized on the carbon electrode exhibits outstanding stability after electrolysis. Nuclear magnetic resonance (NMR) and gas chromatography (GC) demonstrate that the hybrid electrode system is able to oxidize ethanol to CO2 after 10 h of electrolysis. Overall, this study illustrates the enhancement of an enzymatic biofuel cell through the hybrid multi-catalytic systems, which exhibit high oxidation rates for all substrates involved in complete ethanol oxidation, enabling the collection of up to 12 electrons per molecule of ethanol. (AU)

• 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
• 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