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Abstract
Degradation tests in deionised water of radiation grafted anion exchange membranes for fuel cell/electrolyser operation showed loss of vinylbenzyl trimethylammonium groups.
Highlights
Among the different types of fuel cell systems, proton-exchange membrane fuel cells (PEMFCs) and alkaline fuel cells (AFCs) are the most studied for practical service applications, in low temperature regimes of operating conditions
With all of the other parameters remaining constant (i.e. vinylbenzyl chloride (VBC) monomer concentration, amination time, and total radiation dose), higher dose rate results in a higher degree of gra ing (DOG) as more high energy radiation is supplied to gra ing,[41] which is observed in low-density polyethylene (LDPE) and high-density polyethylene (HDPE) (Table 2)
A er the stability test, there was an observed decrease in ion-exchange capacity (IEC), a decrease in ionic conductivity, which is an indication of anion-exchange membranes (AEMs) degradation
Summary
Among the different types of fuel cell systems, proton-exchange membrane fuel cells (PEMFCs) and alkaline fuel cells (AFCs) are the most studied for practical service applications, in low temperature regimes of operating conditions. Limited chemical analysis has been conducted regarding the chemical stability of AEMs. a more fundamental understanding of the chemical stability of AEMs is required to adequately design robust solid-state AEMFCs and electrolysers.[23] Degradation tests of membranes having quaternary ammonium groups reported in literature were all performed in high alkaline concentrations[42,43] and elevated temperature.[14,23,44] This study is the rst attempt to illustrate the degradation of the OHÀ exchanged AEM stored in deionised water, which is the usual medium present in electrolyser and fuel cell operations. Such ndings will have a signi cant impact on the way we design and fabricate AEMs in order to obtain excellent thermal and chemical stability properties
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