Microbial Fuel Cell Based on Ensifer meliloti
Sigita Bendinskaite, Ingrida Bruzaite, Juste Rozene, Tomas Mockaitis +4
AI summary
70% confidenceA microbial fuel cell (MFC) based on Ensifer meliloti bacteria was developed, using 9,10-phenanthrenequinone and potassium ferricyanide as redox mediators, and showed promising results in converting chemical energy into electrical energy.
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Open in lab →What they did
- System
- MFC
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Abstract
The world’s growing energy crisis demands renewable energy sources. This issue can be solved using microbial fuel cells (MFCs). MFCs are biocatalytic systems which convert chemical energy into electrical energy, thereby reducing pollution from hazardous chemical compounds. However, during the development of MFCs, one of the most significant challenges is finding and assessment of microorganisms that generate sufficient redox potential through metabolic and catalytic processes. In this research, we have used Ensifer meliloti (E. meliloti) bacteria to design MFCs based on consecutive action of two redox mediators (9,10 - phenanthrenequinone (PQ) and potassium ferricyanide), which transferred charge between E. meliloti bacteria and graphite rod electrode. A viability study of E. meliloti culture showed that PQ significantly inhibits the growth of bacteria at 0.036 mM. Cyclic voltammograms were registered in the presence of 20 mM of potassium ferricyanide and different concentrations (0.036 and 0.071 mM, 0.11 mM, 0.14 mM, 0.172 mM, 0.32 mM) of PQ. Four days of lasting assessment of the microbial fuel cells in two-electrode systems showed that the maximal open circuit potential during the experiment raised from 174.9 to 234.6 mV. Power increased from 0.392 to 0.741 mW m −2 .
Key findings
- Ensifer meliloti bacteria generated sufficient redox potential through metabolic and catalytic processes.
- The presence of 9,10-phenanthrenequinone significantly inhibited the growth of Ensifer meliloti bacteria at 0.036 mM.
- Cyclic voltammograms showed a transfer of charge between Ensifer meliloti bacteria and graphite rod electrode in the presence of potassium ferricyanide and different concentrations of 9,10-phenanthrenequinone.
Keywords
Identifiers
- Journal
- Journal of The Electrochemical Society
- Year
- 2024