Abstract

A detailed perspective on the use of anion-exchange membranes in fuel cells, electrolysers, flow batteries, reverse electrodialysis, and bioelectrochemical systems.

Highlights

  • As described in the previous sections, fuel cells and other alkaline polymer electrolyte fuel cells (APEFCs) operating at high pH using alkaline anion form (AAEM) materials have attracted attention due to their favourable operating parameters with major advantages including the use non-noble metals at the cathode and a wider range of fuel options at the anode.[2,288]

  • As with the more wellknown proton-exchange membrane fuel cells (PEMFCs), APEFCs can be operated with Pt-based catalysts

  • It should be noted that even though the oxygen reduction reaction is slightly less of a problem at high pHs, the hydrogen oxidation reaction kinetics is poorer with Pt catalysts in alkali than in acid

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Summary

Pt 2 15c

(b) Pt-free highly efficient catalysts, especially for the HOR. Advances related the above two issues will assure rapid entrance of APEFCs into existing market opportunities. Zhao et al achieved a peak power density of 38 mW cmÀ2 at 60 C when supplying a fuel cell containing a Tokuyama A201 AAEM (PdNi anode and Acta HypermecTM K14 cathode catalysts) with aqueous glucose (0.5 mol dmÀ3) containing added KOH (7 mol dmÀ3). As described in the previous sections, fuel cells and other APEFCs operating at high pH using AAEM materials have attracted attention due to their favourable operating parameters with major advantages including the use non-noble metals at the cathode and a wider range of fuel options at the anode.[2,288] the lower ionic conductivity of AAEMs compared to PEMs (such as Na on®) at lower RHs is a concern because it may lower the performance.[52] PEMFCs and APEFCs require careful water management because water is consumed at the cathode in APEFCs and water is needed for ion hydration (in both).

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Findings
Summary and concluding remarks

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