Issue 54, 2016, Issue in Progress

Mediator-free carbon nanotube yarn biofuel cell

Abstract

Enzymatic biofuel cells are the most promising energy sources for implanted biomedical devices. However, direct implantation of biofuel cells has been limited by toxicity from metal-based redox mediators, and by a short operation time because of their instability, especially in physiological conditions. Here we introduce a yarn-type enzymatic biofuel cell for direct electron transfer using surface tension induced self-assembly of aligned multi-walled carbon nanotubes. This biofuel cell offers a maximum power density of 236 μW cm−2, and an open circuit voltage of 0.61 V in 30 mM glucose-containing phosphate-buffered saline, without any mediators or chemical cross-linkers. Furthermore, the proposed self-assembled carbon nanotube-based structure provides enhanced stability for biofuel cells: 84% of the initial power output was consistently maintained after 20 days of continuous operation. Our biocompatible, microsized yarn biofuel cell electrode could be applied easily as needle or catheter shapes in various biomedical fields.

Graphical abstract: Mediator-free carbon nanotube yarn biofuel cell

Supplementary files

Article information

Article type
Communication
Submitted
11 Mar 2016
Accepted
09 May 2016
First published
11 May 2016

RSC Adv., 2016,6, 48346-48350

Mediator-free carbon nanotube yarn biofuel cell

C. H. Kwon, Y. B. Park, J. A. Lee, Y. Choi, H. Kim, M. D. Lima, R. H. Baughman and S. J. Kim, RSC Adv., 2016, 6, 48346 DOI: 10.1039/C6RA06570H

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