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Mechanically alloyed NiCuMnWX (X = Co; Fe; or Mo) high-entropy alloy electrocatalysts for alkaline water splitting
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DOI：10.1039/D5FD00094G.png)
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Abstract
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High-entropy alloys have great potential as electrocatalysts for water-splitting reactions. Benefiting from the cocktail effect and lattice distortion; high-entropy alloys exhibit relatively low overpotentials and significant stability; making them excellent candidates for electrocatalytic water splitting. These materials offer a cost-effective and abundant alternative to conventional noble-metal catalysts such as Pt and IrO2; which are limited by high costs and scarcity. This study investigates the electrocatalytic performance of high-entropy alloy powders prepared with equimolar ratios of Ni; Cu; Mn; and W; with additional elements (Co; Fe; or Mo) introduced to optimize their activity for the hydrogen evolution reaction and oxygen evolution reaction. The high-entropy alloy powders are synthesized via ball milling; involving both dry milling and wet milling in ethanol; followed by washing and drying at room temperature. Comprehensive characterization techniques; including X-ray diffraction; field-emission scanning electron microscopy; scanning transmission electron microscopy with energy-dispersive X-ray spectroscopy; and X-ray photoelectron spectroscopy; are employed to analyze their structure and properties. Electrochemical studies reveal that Fe and Mo significantly enhance hydrogen evolution reaction activity; achieving overpotentials of 301 mV and 305 mV; respectively; with corresponding Tafel slopes of 200.9 mV dec−1 and 153.3 mV dec−1. Meanwhile; Co incorporation improves oxygen evolution reaction performance; reducing the overpotential to 326 mV with a Tafel slope of 143.7 mV dec−1. These findings underscore the potential of high-entropy alloy powders for advancing renewable energy technologies.
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