Abstract
High-entropy alloys (HEAs) have been paid attention for their exceptional material properties. FeNiCoCrMn HEAs electrocatalysts were synthesized on copper foam by electrodeposition. The effects of deposition potential and additives on the surface morphology and crystal structure of the catalysts were investigated, and their hydrogen evolution reaction (HER) performance in 1.0 M KOH solution was studied. The high deposition potential enhanced nucleation, leading to intricate structural formations, while CTAB and citrate additives notably altered the surface texture of the catalysts, affecting HER activity. Notably, Fe0.19Ni0.24Co0.29Cr0.18Mn0.1 electrocatalyst with a low Tafel slope of 84.7 mV dec−1 showed good HER activity, only required the overpotential of 191 mV to achieve a current density of 10 mA cm−2.
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