Alkali anion exchange membrane

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An alkali anion exchange membrane (AAEM) is a semipermeable membrane generally made from ionomers and designed to conduct anions while being impermeable to gases such as oxygen or hydrogen. This is their essential function when incorporated into a membrane electrode assembly (MEA) of a DMFC[1] or DEFC [2]: separation of reactants and transport of anions.

Advantage

The advantage of the alkali anion exchange membrane in the fuel cell is the potential to use non-noble metals such as iron, cobalt or nickel[3] due to the low overpotentials associated with electrochemical reactions at high pH[4][5]. In comparison against Alkaline fuel cell, alkali anion exchange membrane fuel cells also protect the electrode from carbonate formation, which can cause fuel (oxygen/hydrogen) transport problem during start-up.

See also

References

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  1. Comparison of PVDF and FEP based radiation-grafted alkaline anionexchange membranes for use in low temperature portable DMFCs
  2. Direct ethanol fuel cells using alkaline anion exchange membrane
  3. Platinum-free fuel cell developed in Japan
  4. Poly(phenylene)-based anion exchange membranes for alkaline fuel cells
  5. Anion Exchange Membrane and Ionomer for Alkaline Membrane Fuel Cells