Plasma sprayed high-entropy alloy coatings with enhanced water splitting activity in alkaline environment

Developing highly efficient electrocatalysts for water splitting is an effective strategy to promote renewable and sustainable energy resources. Multimetal high-entropy alloys (HEAs) have generated considerable attention as promising catalysts because of their unique properties. Herein, the porous HEA coatings have been prepared via the plasma spraying method, which is expected to resolve the above issues. The catalysts can afford a promising catalytic performance through the distinct porous structure. This work results that the CoCrFeNiAlMo catalyst possesses a tiny overpotential (253 mV at 50 mA cm- 2) with minimal Tafel slope (59.75 mV dec- 1). At the same time, the CoCrFeNiAlMo catalyst also exhibits a relatively small overpotential for hydrogen evolution reaction. As catalysts for overall water splitting, it delivers a cell voltage of 1.74 V at 50 mA cm- 2 and a superior durable for 48 h. This research provides an insight for using the multinary HEA coatings as electrocatalysts in energy applications.