Evaluation of a Yeast–Polypyrrole Biocomposite Used in Microbial Fuel Cells
Antanas Zinovicius, Juste Rozene, Timas Merkelis, Ingrida Bruzaite +2
AI summary
70% confidenceA biocomposite of yeast and polypyrrole was evaluated for use in microbial fuel cells, showing improved performance with minimal modification.
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Abstract
Electrically conductive polymers are promising materials for charge transfer from living cells to the anodes of electrochemical biosensors and biofuel cells. The modification of living cells by polypyrrole (PPy) causes shortened cell lifespan, burdens the replication process, and diminishes renewability in the long term. In this paper, the viability and morphology non-modified, inactivated, and PPy-modified yeasts were evaluated. The results displayed a reduction in cell size, an incremental increase in roughness parameters, and the formation of small structural clusters of polymers on the yeast cells with the increase in the pyrrole concentration used for modification. Yeast modified with the lowest pyrrole concentration showed minimal change; thus, a microbial fuel cell (MFC) was designed using yeast modified by a solution containing 0.05 M pyrrole and compared with the characteristics of an MFC based on non-modified yeast. The maximal generated power of the modified system was 47.12 mW/m², which is 8.32 mW/m² higher than that of the system based on non-modified yeast. The open-circuit potentials of the non-modified and PPy-modified yeast-based cells were 335 mV and 390 mV, respectively. Even though applying a PPy layer to yeast increases the charge-transfer efficiency towards the electrode, the damage done to the cells due to modification with a higher concentration of PPy diminishes the amount of charge transferred, as the current density drops by 846 μA/cm². This decrease suggests that modification by PPy may have a cytotoxic effect that greatly hinders the metabolic activity of yeast.
Key findings
- PPy modification caused a reduction in cell size and an increase in roughness parameters.
- The formation of small structural clusters of polymers on yeast cells was observed with increased pyrrole concentration.
- The maximal generated power of the modified system was 47.12 mW/m², 8.32 mW/m² higher than non-modified yeast.
Keywords
Identifiers
- Journal
- Sensors
- Year
- 2022