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

  • TAKEO MIYAKE (a1) (a2), SYUHEI YOSHINO (a1), TAKEO YAMADA (a2) (a3), KENJI HATA (a2) (a3) and MATSUHIKO NISHIZAWA (a1) (a2)...

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.

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References

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Keywords

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

  • TAKEO MIYAKE (a1) (a2), SYUHEI YOSHINO (a1), TAKEO YAMADA (a2) (a3), KENJI HATA (a2) (a3) and MATSUHIKO NISHIZAWA (a1) (a2)...

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