High-entropy spinel (FeCoNiMnCr)3O4 nanoparticles supported on carbon nanotubes for enhanced electrochemical seawater oxidation

High-performance, low-cost electrocatalysts are essential for freshwater-independent seawater electrolysis. We design a SWCNT-supported (FeCoNiMnCr)₃O₄ high-entropy spinel oxide by a hydrothermal method and air-firing, where the conductive network enhances charge transfer and active site exposure. The catalyst achieves 282 mV@10 mA cm^-2 with 100 h stability in alkaline seawater. This work provides a new strategy for electrolysis of high entropy spinel oxides in seawater.