Water management in anion-exchange membrane water electrolyzers under dry cathode operation.

ABSTRACT: Dry cathode operation is a desired operation mode in anion-exchange membrane water electrolyzers to minimize contamination of the generated hydrogen. However, water management under such operation conditions makes it challenging to maintain reliable performance and durability. Here, we utilize high-resolution in situ neutron imaging (∼6 μm effective resolution) to analyze the water content inside the membrane-electrode-assembly of an anion-exchange membrane water electrolyzer. The ion-exchange capacity (IEC) and thus hydrophilicity of the polymer binder in the cathode catalyst layer is varied to study the influence on water content in the anode (mid IEC, 1.8-2.2 meq. g^-1 and high IEC, 2.3-2.6 meq. g^-1). The neutron radiographies show that a higher ion-exchange

SUBMITTER: Koch S 

PROVIDER: S-EPMC9297697 | biostudies-literature | 2022 Jul

REPOSITORIES: biostudies-literature