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Oxidative instability of ionomers in hydroxide-exchange-membrane water electrolyzers
Ist Teil von
Energy & environmental science, 2023-10, Vol.16 (1), p.4373-4387
Ort / Verlag
Cambridge: Royal Society of Chemistry
Erscheinungsjahr
2023
Link zum Volltext
Quelle
Alma/SFX Local Collection
Beschreibungen/Notizen
Hydroxide-exchange membrane (HEM) electrolyzers can produce green H
2
with only earth-abundant catalysts and electrolyte-free (nominally pure) water feed, significantly decreasing system cost and complexity. However, HEM technology suffers from short lifetimes, attributed in part to poor stability of anion-exchange polymers used in the membrane and catalyst layers. We use electrochemical analysis and
ex situ
characterization techniques to study anion-exchange-polymer degradation in electrolyzers. Using multiple ionomers, catalyst-layer additives, and electrolyte feed, we show how anode-ionomer oxidation is the dominant degradation mechanism for all HEM-based electrolyzer cells tested. We find improved device stability using oxidation-resistant catalyst-layer binders and propose new design strategies for advanced ionomer and catalyst-layer development.
Ionomer oxidation is the dominant degradation pathway for electrolyte-free HEM electrolyzers and may be mitigated by new catalyst layer design strategies.