Scalable Plasma‐Processed NiMo Electrocatalysts for Efficient Hydrogen Evolution: Enhancement of Catalytic Efficiency through Plasma Surface Modification

Abstract Given the rising global energy demands and environmental concerns, developing efficient, non‐hazardous methods for producing electrocatalysts is crucial. The challenge lies not only in enhancing catalyst performance but also in finding scalable, cost‐effective techniques for large‐scale production. Plasma technologies, with their adaptability and versatility in energy conversion and storage, have garnered significant attention. These chemical‐free methods provide precise control over material properties and enable the fabrication of high‐performance electrocatalysts in a single step. In this work, plasma technology is leveraged to fabricate a durable, high‐performance NiMo electrocatalyst in varying ratios (3:1, 3:2, 3:3) for the hydrogen evolution reaction (HER) using atmospheric plasma spray. The NiMo(3:3) composition demonstrates superior catalytic performance with an overpotential of 112 mV at a current density of 20 mA cm −2 . Further, Low‐pressure nitrogen plasma treatment for 15 minutes significantly reduces the overpotential to 78 mV, enhancing HER performance by altering surface properties and boosting active site exposure. The catalyst also shows a lower Tafel value of 57.16 mV dec −1 and high stability in chronoamperometry under acidic conditions for 30 hours, proving its sustainability in harsh environments. This work provides solid evidence of plasma's suitability as a powerful and sustainable approach for fabricating advanced electrocatalysts in energy applications