Enzymatic glucose-oxygen biofuel cells are possible alternative to conventional lithium-ion batteries for powering of small-scale implantable devices. Though, the implantable biofuel cell has to meet special demands due to its quite specific potential application. The enzymatic anode for such a cell has to fulfill several requirements including low oxidation overpotential, high current densities, sufficient oxygen tolerance and high long-term stability.

    An immobilisation procedure employing conductive polypyrrole layer, a charge-transfer complex (CTC), Glucose oxidase (GOx) and a gelatin membrane has been developed. The influence of different parameters, including CTC loading and morphology, GOx loading, membrane thickness, etc. on the activity of the resulting bioanode has been investigated.

Figure 1: The influence of the CTC morphology on the glucose oxidation activity. A) Chronoamperograms of the different anodes in presence of glucose; SEM images of CTC when TTF solution was applied with B) pipette and C) dispensing robot.   

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