Performance of Enzymatic Biofuel Cells in Series

Implantable biosensors are necessary for measuring levels of compounds in the human body. These sensors have special applications such as glucose sensors for individuals with diabetes. However, these devices must have a power source that is both small and long-lasting, to allow for biosensor implantation for an extended period of time. One option for powering a small, implantable device is a biofuel cell. Biofuel cells work by oxidizing one compound and reducing another, creating a net flow of electrons from the cathode to the anode. However, to be able to use biofuel cells effectively, the power output must be significantly increased. To increase the power output, it was hypothesized that modified biofuel cells could be linked in series. To test this hypothesis, electrodes were first modified by adding enzymes and polymers. The biofuel cells were then tested individually as well as in series and the power outputs were compared. The power output was found to increase with an increased number of cells.