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

Yusuke Ayato and Naoki Matsuda
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Yusuke Ayato: Measurement Solution Research Center, National Institute of Advanced Industrial Science and Technology (AIST), 807-1 Shukumachi, Tosu, Saga 841-0052, Japan
Naoki Matsuda: Measurement Solution Research Center, National Institute of Advanced Industrial Science and Technology (AIST), 807-1 Shukumachi, Tosu, Saga 841-0052, Japan

Energies, 2013, vol. 7, issue 1, 1-12

Abstract: 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 (H 2 O 2 ). 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 H 2 O 2 due to the electrocatalytic activity of Hb increased with decreasing electrode potential from around 0.1 V v ers us Ag|AgCl|KCl(satd.) in the PBS solution. The practical open-circuit voltage (OCV) on BFCs utilizing H 2 O 2 reduction at the Hb-ITO cathode with a hydrogen (H 2 ) oxidation anode at a platinum (Pt) electrode was expected to be at least 0.74 V from the theoretical H 2 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 (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2013
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