Alkaline electrolyzers use a liquid potassium hydroxide (KOH) electrolyte, operate at about 60–80 °C, and have decades of industrial use in chlor-alkali and fertilizer plants. PEM electrolyzers use a solid polymer membrane and typically operate at 50–80 °C, delivering very high-purity hydrogen (>99.999%), with iridium catalysts at the anode and platinum at the cathode. SOEC…
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