Enhancement of membrane electrode assembly interfacial properties in polymer electrolyte membrane water electrolysis for the high current operation
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This paper presents a study on the robust membrane electrode assembly (MEA) design in polymer electrolyte membrane water electrolysis cells (PEMWEs). Although the PEMWEs have advantages in dynamic operation and 10-fold activity enhancement in high current operation over alkaline water electrolysis, the stability for discontinuous operation was observed to decrease. We employed a recombination layer to mitigate the degradation of the low iridium-loaded MEA by reducing the hydrogen crossover. In addition, the double-layer porous transport layer (PTL) is applied to the bubble to be effectively removed, thus optimizing the interfacial properties of the catalyst and porous transport layers. This 5-layered MEA exhibited higher catalyst utilization at low current density and lower mass transport resistance at high current density (i.e., above 5 A/cm2).