Hybrid Bioelectrocatalytic Reduction of Oxygen at Anthracene-modified Multi-walled Carbon Nanotubes Decorated with Ni90Pd10 Nanoparticles

Autor(es)

Aquino Neto, Sidney ^[1] ; Da Silva, Rodrigo G. ^[1] ; Milton, Ross D. ^{[2, 3]} ; Minteer, Shelley D. ^{[2, 3]} ; De Andrade, Adalgisa R. ^[1]

Afiliação do(s) autor(es)

^[1] Univ Sao Paulo, Fac Filosofia Ciencias & Letras Ribeirao Preto, Dept Quim, BR-14040901 Ribeirao Preto, SP - Brazil

^[2] Univ Utah, Dept Chem, Salt Lake City, UT 84112 - USA

^[3] Univ Utah, Dept Mat Sci & Engn, Salt Lake City, UT 84112 - USA

• Tipo de documento: Artigo Científico
• Fonte: Electrochimica Acta; v. 251, p. 195-202, OCT 10 2017.
• Citações Web of Science: 1

Resumo

Considering the importance of the oxygen reduction reaction (ORR) for many energy conversion technologies, the design of cost-effective and active electrocatalysts is quite important for the future energy economy. In this investigation, we report the preparation of hybrid biocathodes containing multi-walled carbon nanotubes (MWCNTs) decorated with both enzymes and Ni90Pd10 metallic nanoparticles, targeting the bioelectrocatalytic reduction of oxygen in buffered solutions. The electrochemical characterization showed that the presence of the hydrophobic moieties did not affect the metal nanoparticle synthesis protocol, attesting to the possibility of obtaining a bifunctional material containing both the metallic nanoparticles and the aromatic moieties employed for enzyme orientation. Based on the electrochemical data obtained with the hybrid biocathodes, enhanced direct bioelectrocatalytic reduction of oxygen could be clearly observed at both laccase and bilirubin-based biocathodes, with a larger improvement for the hybrid bioelectrode prepared with laccase. In the laccase bioelectrode, the targeted reaction required a lower overpotential and provided about 50% higher current density, thus, demonstrating the benefit of incorporating small amounts of Ni90Pd10 metallic nanoparticles into enzymatic cathodes for the oxygen reduction reaction. (C) 2017 Elsevier Ltd. All rights reserved. (AU)

• Processo FAPESP: 12/10667-0 - Preparação de nanocatalisadores híbridos contendo enzimas, nanotubos de carbono e nanopartículas metálicas para biocélula a combustível EtOH/O2
• Beneficiário: Sidney de Aquino Neto
• Modalidade de apoio: Bolsas no Brasil - Pós-Doutorado