Chlorophobic Iron Hydrogen Phosphite as OER‐Active Electrocatalyst in Anion Exchange Membrane (Sea)Water Electrolysis

at 344 mV overpotential in alkaline real seawater with impressive robustness to sustain for 200 h when operated under chlorine evolution reaction dominating region (>2 V). The electrocatalyst also demonstrates superior performance in anion exchange membrane freshwater and seawater electrolysis, demonstrating its potential applicability.