Abstract
Microbial fuel cells (MFCs) are promising bioelectrochemical systems with the potential for treating organic compounds and simultaneously generating electricity.1 MFCs have been intensively studied in the last decades, but performances remain still low. One of the reasons is that the cathodes are directly exposed to the aqueous solution containing bacteria and various chemical compounds, which leads to cathode flooding and poisoning, and finally lowers the current output. In contrast, enzymes (e.g., laccase and bilirubin oxidase2) are capable of catalyzing oxygen reduction reaction (ORR), and have been used as cathodic catalysts showing high open circuit potential (OCP), very low overpotentials, and high activity, especially in the range where MFCs work3. However, the main problem with enzymatic cathodes is long-term stability. In this report, we extensively characterize the trends of OCP, current density achieved at 0.25V and the polarization behavior of bilirubin oxidase (BOx) based cathode over a period of 12 days.
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