Mesoporous high-entropy-alloy electrocatalysts via electrospinning for enhanced alkaline water electrolysis

Abstract

This study reports on the fabrication and characterization of nanofibrous high-entropy alloy (HEA)-based electrocatalysts supported by highly mesoporous carbon materials for efficient alkaline water electrolysis. Employing a synergistic approach of electrospinning, activation, and carbonization, we have developed a material with a high specific surface area and unique structural features that significantly enhance catalytic activity. The FeCoNiMnRu-HCB_0.5 electrode material showcased superior electrocatalytic performance for both hydrogen evolution reaction (HER) and oxygen evolution reaction (OER), with low overpotentials of 42 mV for HER and 229 mV for OER at a current density of 10 mA cm⁻². These values are notably lower than those of commercial noble metal catalysts. The electrode material demonstrated excellent stability over prolonged periods of electrolysis, indicating its potential for practical applications in energy storage and conversion technologies. Our results suggest that this HEA-based electrocatalyst is a promising candidate for next-generation electrocatalytic materials, offering high efficiency and durability for water splitting in alkaline media.