A Nernstian Biosupercapacitor |
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| Authors: | Dmitry Pankratov Dr. Felipe Conzuelo Dr. Piyanut Pinyou Sabine Alsaoub Prof. Dr. Wolfgang Schuhmann Prof. Dr. Sergey Shleev |
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| Affiliation: | 1. Biomedical Science, Faculty of Health and Society, Malm? University, Malm?, Sweden;2. Kurchatov's Complex of NBICS-technologies, National Research Center “Kurchatov Institute”, Moscow, Russia;3. Analytical Chemistry—Center for Electrochemical Sciences (CES), Ruhr-Universit?t Bochum, Bochum, Germany |
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| Abstract: | We propose the very first “Nernstian biosupercapacitor”, a biodevice based on only one redox polymer: poly(vinyl imidazole‐co‐allylamine)[Os(bpy)2Cl], and two biocatalysts. At the bioanode PQQ‐dependent glucose dehydrogenase reduces the Os3+ moieties at the polymer to Os2+ shifting the Nernst potential of the Os3+/Os2+ redox couple to negative values. Concomitantly, at the biocathode the reduction of O2 by means of bilirubin oxidase embedded in the same redox polymer leads to the oxidation of Os2+ to Os3+ shifting the Nernst potential to higher values. Despite the use of just one redox polymer an open circuit voltage of more than 0.45 V was obtained during charging and the charge is stored in the redox polymer at both the bioanode and the biocathode. By connecting both electrodes via a predefined resistor a high power density is obtained for a short time exceeding the steady state power of a corresponding biofuel cell by a factor of 8. |
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| Keywords: | bioelectrocatalysis biofuel cells Nernstian biosupercapacitor redox hydrogels |
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