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Enzymatic Biofuel Cell with Self-regulating Enzyme-Nanotube Ensemble Films

Published online by Cambridge University Press:  03 February 2012

TAKEO MIYAKE
Affiliation:
Department of Bioengineering and Robotics, Graduate school of Engineering, Tohoku University, 6-6-1 Aramaki Aoba, Aoba-ku, Sendai 980-8579, Japan. JST-CREST, Sanbancho, Chiyodaku, Tokyo, 102-0075, Japan
SYUHEI YOSHINO
Affiliation:
Department of Bioengineering and Robotics, Graduate school of Engineering, Tohoku University, 6-6-1 Aramaki Aoba, Aoba-ku, Sendai 980-8579, Japan.
TAKEO YAMADA
Affiliation:
JST-CREST, Sanbancho, Chiyodaku, Tokyo, 102-0075, Japan National Institute of Advanced Industrial Science and Technology (AIST), Tsukuba Central 5, 1-1-1 Higashi, Tsukuba, Ibaraki 308-8565, Japan.
KENJI HATA
Affiliation:
JST-CREST, Sanbancho, Chiyodaku, Tokyo, 102-0075, Japan National Institute of Advanced Industrial Science and Technology (AIST), Tsukuba Central 5, 1-1-1 Higashi, Tsukuba, Ibaraki 308-8565, Japan.
MATSUHIKO NISHIZAWA
Affiliation:
Department of Bioengineering and Robotics, Graduate school of Engineering, Tohoku University, 6-6-1 Aramaki Aoba, Aoba-ku, Sendai 980-8579, Japan. JST-CREST, Sanbancho, Chiyodaku, Tokyo, 102-0075, Japan
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Abstract

Nanostructured carbons have been widely used for fabricating enzyme-modified electrodes due to their large specific surface area. However, because they are random aggregates of particular or tubular nanocarbons, the post-modification of enzymes to their intra-nanospace is generally hard to control. Here, we describe a free-standing film of carbon nanotube forest (CNTF) that can form a hybrid ensemble with enzymes through liquid-induced shrinkage. This provides in-situ regulation of itsintra-nanospace (inter CNT pitch) to the size of enzymes, and eventually serves as a highly active electrode. The CNTF ensemble with fructose dehydrogenase (FDH) showed the oxidation current density of 16 mA cm-2in stirred 200 mM fructose solution. The power density of a biofuel cell using the FDH-CNTF anode and the Laccase-CNTF cathode reached 1.8 mW cm-2(at 0.45 V) in the stirred oxygenic fructose solution, more than 80 % of which could be maintained after continuous operation for 24 h. Application of the free-standing, flexible character of the enzyme-CNTF ensemble electrodes is demonstrated via their use in the patch or wound form.

Type
Research Article
Copyright
Copyright © Materials Research Society 2012

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