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Energies 2014, 7(1), 1-12; doi:10.3390/en7010001

Evaluation of Biofuel Cells with Hemoglobin as Cathodic Electrocatalysts for Hydrogen Peroxide Reduction on Bare Indium-Tin-Oxide Electrodes

Measurement Solution Research Center, National Institute of Advanced Industrial Science and Technology (AIST), 807-1 Shukumachi, Tosu, Saga 841-0052, Japan Current address: Faculty of Textile Science and Technology, Materials and Chemical Engineering, Shinshu University, 3-15-1 Tokida, Ueda, Nagano 386-8567, Japan.
* Author to whom correspondence should be addressed.
Received: 1 November 2013 / Revised: 9 December 2013 / Accepted: 13 December 2013 / Published: 20 December 2013
(This article belongs to the Special Issue Biomass and Biofuels 2013)
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A biofuel cell (BFC) cathode has been developed based on direct electron transfer (DET) of hemoglobin (Hb) molecules with an indium-tin-oxide (ITO) electrode and their electrocatalysis for reduction of hydrogen peroxide (H2O2). In this study, the ITO-coated glass plates or porous glasses were prepared by using a chemical vapor deposition (CVD) method and examined the electrochemical characteristics of the formed ITO in pH 7.4 of phosphate buffered saline (PBS) solutions containing and not containing Hb. In half-cell measurements, the reduction current of H2O2 due to the electrocatalytic activity of Hb increased with decreasing electrode potential from around 0.1 V versus Ag|AgCl|KCl(satd.) in the PBS solution. The practical open-circuit voltage (OCV) on BFCs utilizing H2O2 reduction at the Hb-ITO cathode with a hydrogen (H2) oxidation anode at a platinum (Pt) electrode was expected to be at least 0.74 V from the theoretical H2 oxidation potential of −0.64 V versus Ag|AgCl|KCl(satd.) in pH 7.4. The assembled single cell using the ITO-coated glass plate showed the OCV of 0.72 V and the maximum power density of 3.1 µW cm−2. The maximum power per single cell was recorded at 21.5 µW by using the ITO-coated porous glass.
Keywords: biofuel cell; hemoglobin; indium-tin-oxide electrode; hydrogen peroxide biofuel cell; hemoglobin; indium-tin-oxide electrode; hydrogen peroxide
This is an open access article distributed under the Creative Commons Attribution License (CC BY) which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

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Ayato, Y.; Matsuda, N. Evaluation of Biofuel Cells with Hemoglobin as Cathodic Electrocatalysts for Hydrogen Peroxide Reduction on Bare Indium-Tin-Oxide Electrodes. Energies 2014, 7, 1-12.

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