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GREEN HYDROGEN COST REDUCTION AEM electrolysers have similar system design concepts to that of PEM electrolysers (see Figure 9). Due to the low maturity of this technology, however, there is limited information on the challenges related to high differential pressure operation. At this early stage, improvements are expected in the mechanical stability of AEM membranes, gas purity, their ability to withstand high pressure differentials and their greater power range compared to alkaline. AEM electrolysers are still limited to a much narrower range of power input in comparison to PEM electrolysers. The limitation, therefore, is not in the stack itself, but in the sizing of the balance of plant. Figure 9. Typical system design and balance of plant for an AEM electrolyser. Note: This configuration is for a generic system and might not be representative of all existing manufacturers. Based on IRENA analysis. Figure 10. Typical system design and balance of plant for a solid oxide electrolyser. Hydrogen Oxygen Water 36 Note: This configuration is for a generic system and might not be representative of all existing manufacturers. Based on IRENA analysis. Hydrogen Oxygen WaterPDF Image | GREEN HYDROGEN SCALING UP ELECTROLYSERS
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