Laser engineered fabrication of a binder-free NiCoFeCrZn-based high entropy oxide electrode for the hydrogen evolution reaction in alkaline water

Abstract

A NiCoFeCrZn-based HEO was directly synthesized over carbon cloth via one step CO₂ laser irradiation of metal salts. The binder-free HEO-based electrode (HEO/CC) exhibits excellent HER activity under alkaline conditions, achieving low overpotentials of 52 mV at 10 mA cm⁻², and maintains stable performance over 14 days at a higher current density.