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GREEN HYDROGEN COST REDUCTION For the core of the stack, the catalyst coated membrane (CCM), rare metals represent an important part of the cost. Put into context, however, they represent less than 10% of the cost of a full PEM electrolysis system. Yet, for iridium in particular, they might represent a bottleneck for scaling up manufacturing of PEM electrolysers, in the absence of a significant scale-up of iridium supply (see Chapter 3, Section 3). Figure 18. Cost breakdown for a 1 MW PEM electrolyser, moving from full system, to stack, to CCM. 3% 45% PEM Electrolyser cost breakdown 20% 55% Balance of Plant Stack components incl. CCM 8% Balance of Plant 25% Manufacturing PFSA Membrane Iridium Platinum Porous Transport Layer (PTLs) Small parts (sealing, frames) Bipolar Plates (BPs) Stack assembly and end plates Catalyst Coated Membrane Protective coating BPs Power Supply Deionised Water Circulation Hydrogen Processing Cooling 24% 17% Stack 13% 42% Catalyst Coated Membrane 21% 3% 53% 22% 50% Note: The specific breakdown varies by manufacturer, application and location, but values in the figure represent an average. Based on IRENA analysis. 52PDF Image | GREEN HYDROGEN SCALING UP ELECTROLYSERS
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