Quad-metallic MOF-derived carbon-armored pseudo-high entropy alloys as a bifunctional electrocatalyst for alkaline water electrolysis at high current densities

A quad-metallic pseudo-HEA catalyst, FeCoNiMo@C, was developed for water electrolysis, exhibiting outstanding bifunctional catalytic efficiency and stability, 500 mA cm −2 @1.725 V and a 3.4% decay after a 50 h operation at 500 mA cm −2 .