期刊
JOURNAL OF POWER SOURCES
卷 259, 期 -, 页码 25-32出版社
ELSEVIER SCIENCE BV
DOI: 10.1016/j.jpowsour.2014.02.069
关键词
Ethanol biofuel cell; Hybrid bioanode; Gold nanoparticles; TBAB-modified Nafion((R)); Dendrimer-encapsulated nanoparticles
资金
- FAPESP
- CAPES
- CNPq
- C2NANO - Center for Nanoscience and Nanotechnology/MCT
- National Science Foundation
- Div Of Chem, Bioeng, Env, & Transp Sys
- Directorate For Engineering [1158943] Funding Source: National Science Foundation
We report the preparation of hybrid nanostructured bioanodes containing the enzyme alcohol dehydrogenase (ADH) with either Au, Pt, or Pt0.75Sn0.25 nanoparticles for use in ethanol/O-2 hybrid biofuel cells. We describe two different methodologies for the preparation of the bioanodes: in a first case, multi walled carbon nanotubes (MWCNTs) were employed as a support for the metallic nanoparticles and TBAB-modified Nafion (R) aided enzyme immobilization. In the second case, we immobilized the enzymes using dendrimers-encapsulated nanoparticles as the agent for enzyme anchoring. The biofuel cell tests showed that the addition of metallic nanoparticles to the bioanode structure enhanced the overall biofuel cell performance. The bioelectrode containing Au nanoparticles displaying the best performance, with an open circuit potential of 0.61 +/- 0.05 V and a maximum power density of 155 +/- 11 mu W cm(-2). NADH cyclic voltammetric experiments indicated that Au nanoparticles behaved as a catalyst toward NADH oxidation. Comparing the two protocols we used to synthetized nanoparticles, the sample containing the Au nanoparticles supported on MWCNTs furnished fourfold higher values. Therefore, from the satisfactory results obtained, it can be inferred that the combination of small amounts of metallic nanoparticles with enzymes improve bioanode performance. (C) 2014 Elsevier B.V. All rights reserved.
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