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Similar to what happens with PEM, some clear priority areas arise for alkaline electrolysers when the potential for cost reduction is combined with the current share of total system cost of each component (see Figure 21): power supply is the single largest area where cost reduction could be achieved, followed by the manufacturing of the electrodes and diaphragms. The strategy can be to completely reengineer them, demonstrating CCM concepts similar to the PEM type, where a single component comprised of membranes, electrodes, and eventually PTLs, is fabricated. Balance of plant items, such as lye circulation and hydrogen processing remain important for alkaline too, although no significant potential for reduction in the cost for materials has been observed. Figure 21. 30% 20% 10% 0% System components for a 1-MW alkaline electrolyser classified based on contribution to total system cost and potential for cost reduction. SCALING UP ELECTROLYSERS TO MEET THE 1.5°C CLIMATE GOAL Power Supply Bipolar Plates (BPs) Small parts (sealing, frames) Low Porous Transport Layer (PTLs) Manufacturing Deionized Water Circulation Hydrogen Processing Cooling Nickel based anodes Nickel based cathodes Based on IRENA analysis. Medium High Potential for cost reduction 55 Fraction of the total system cost (%)PDF Image | GREEN HYDROGEN SCALING UP ELECTROLYSERS
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