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Rechargeable, flexible and mediator-free biosupercapacitor based on transparent ITO nanoparticle modified electrodes acting in µM glucose containing buffers.

Biosensors & bioelectronics (2017-10-20)
Tim Bobrowski, Elena González Arribas, Roland Ludwig, Miguel D Toscano, Sergey Shleev, Wolfgang Schuhmann
ABSTRACT

We present a transparent and flexible self-charging biosupercapacitor based on an optimised mediator- and membrane-free enzymatic glucose/oxygen biofuel cell. Indium tin oxide (ITO) nanoparticles were spray-coated on transparent conducting ITO supports resulting in a flocculent, porous and nanostructured electrode surface. By this, high capacitive currents caused by an increased electrochemical double layer as well as enhanced catalytic currents due to a higher number of immobilised enzyme molecules were obtained. After a chemical pre-treatment with a silane derivative, bilirubin oxidase from Myrothecium verrucaria was immobilized onto the ITO nanostructured electrode surface under formation of a biocathode, while bioanodes were obtained by either immobilisation of cellobiose dehydrogenase from Corynascus thermophilus or soluble PQQ-dependent glucose dehydrogenase from Acinetobacter calcoaceticus. The latter showed a lower apparent K

MATERIALS
Product Number
Brand
Product Description

Sigma-Aldrich
(3-Aminopropyl)triethoxysilane, 99%
Sigma-Aldrich
(3-Glycidyloxypropyl)trimethoxysilane, ≥98%
Sigma-Aldrich
Methoxatin disodium salt, ≥97.0% (HPLC)