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Issue 54, 2016, Issue in Progress
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Mediator-free carbon nanotube yarn biofuel cell

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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

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Publication details

The article was received on 11 Mar 2016, accepted on 09 May 2016 and first published on 11 May 2016

Article type: Communication
DOI: 10.1039/C6RA06570H
Citation: RSC Adv., 2016,6, 48346-48350
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    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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