| Full text | |
| Author(s): |
Aquino Neto, Sidney
[1]
;
Da Silva, Rodrigo G.
[1]
;
Milton, Ross D.
[2, 3]
;
Minteer, Shelley D.
[2, 3]
;
De Andrade, Adalgisa R.
[1]
Total Authors: 5
|
| Affiliation: | [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
Total Affiliations: 3
|
| Document type: | Journal article |
| Source: | Electrochimica Acta; v. 251, p. 195-202, OCT 10 2017. |
| Web of Science Citations: | 1 |
| Abstract | |
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) | |
| FAPESP's process: | 12/10667-0 - Preparation of hybrid nanocatalysts containing enzymes, carbon nanotubes and metallic nanoparticles for EtOH/O2 biofuel cell |
| Grantee: | Sidney de Aquino Neto |
| Support Opportunities: | Scholarships in Brazil - Post-Doctoral |