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This paper presents a novel microbial fuel cell structure with a bipolar membrane, utilizing iron(III) hydroxide as the final electron acceptor. The cell generated electrons for 20 days with a maximum current density of 30 mA/m². The bipolar membrane played a crucial role in maintaining anaerobic conditions and facilitating the reaction between protons and hydroxide ions.

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System
MFC

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Abstract

In this paper, we presented a novel microbial fuel cell (bMFC) structure, with a bipolar membrane separating the anode and cathode chambers. A bipolar membrane divides the bMFC into anode and cathode chambers. The bipolar membrane comprises anion and cation exchange layers. The anode chamber side has the cation exchange layer, while the cathode chamber side has the anion exchange layer. The anode chamber of the bMFC was loaded with Shewanella oneidensis MR-1 and lactic acid, while the cathode chamber was loaded with pure water and iron (III) hydroxide. The bMFC generated electrons for 20 days at a maximum current density of 30 mA/m² and the ohmic resistance value was estimated to be 500 Ω. During the operation of the bMFC, both the anode and cathode chambers kept anaerobic conditions. There was no platinum catalyst in the cathode chamber, which is required for the reaction of protons with oxygen. Therefore, oxygen could not serve as an electron acceptor in the bMFC. We considered a bMFC mechanism in which protons produced by S. oneidensis react with hydroxide ions, the counter anions of Fe3+, inside the bipolar membrane to produce water. In other words, the electron acceptor in bMFC would be Fe3+.

Key findings

  • The bMFC generated electrons for 20 days at a maximum current density of 30 mA/m²
  • The ohmic resistance value was estimated to be 500 Ω
  • The bipolar membrane enabled the reaction between protons and hydroxide ions, producing water

Keywords

Shewanella oneidensisCathodeAnodeMicrobial fuel cellElectron acceptorInorganic chemistry

Identifiers

DOI
10.3390/en16062527
Journal
Energies
Year
2023