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An anion exchange membrane (AEM) was used in a single-chamber microbial fuel cell (MFC) to enhance stability and reduce power density loss.

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What they did

System
MFC

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Abstract

Abstract BACKGROUD: A decreased power density could be observed in a single‐chamber microbial fuel cell (MFC) with a cation exchange membrane (CEM), as a result of pH‐associated problem and a precipitated salt‐associated problem, due to the transport of cations other than protons through the membrane to the cathode. To inhibit cation transport and enhance the stability of power generation, an anion exchange membranes (AEM) was applied in a single‐chamber MFC. RESULTS: After 70 days' operation, the power density dropped 29% in the MFC with an AEM (AMFC), smaller than 48% in the MFC with a cation exchange membrane (CMFC). The reason for this difference lay in internal resistance development. Membrane resistance in the AMFC remained the same but that in the CMFC was increased by 67 Ω, and the cathode resistance increase in the AMFC was 54 Ω, while that in the CMFC was 123 Ω. The precipitated cations on the cathode catalyst surface in the CMFC, which accounted for the resistance increase, were up to 84 times larger than that in the AMFC. CONCLUSION: Because of its capacity for inhibiting cations, the AMFC possessed more stable membrane and cathode resistances; thus an enhanced power generation was obtained. Copyright © 2009 Society of Chemical Industry

Key findings

  • Power density dropped 29% in the MFC with an AEM after 70 days, compared to 48% in the MFC with a cation exchange membrane.
  • Internal resistance development was the reason for the difference in power density loss.
  • Membrane resistance in the AEM remained the same, while it increased by 67 Ω in the cation exchange membrane MFC.

Keywords

Microbial fuel cellCathodeMembraneInternal resistancePower densityIon exchange

Identifiers

DOI
10.1002/jctb.2242
Journal
Journal of Chemical Technology & Biotechnology
Year
2009