LAUSR

Abstract WO2- and MxWO3-based (M = H, Li, Na, K, et al., x > 0.25) materials are worthy to be investigated as photo- and electro-catalysts, while their poor stability in alkaline media needs to be improved. We adopt FeOOH to coat WO2-NaxWO3 catalyst for preventing corrosion and enhancing oxygen evolution reaction (OER) performance in alkaline medium. Its potential rises only 18 mV after stability test at 100 mA cm−2 for 120 h in 1.0 M KOH, while the sample without coating layer rises by 43 mV, exhibiting great durability. Meanwhile, it shows an ultra-low overpotential of 220 mV at 20 mA cm−2, displaying good activity. This work highlights that FeOOH stabilizes WO2-NaxWO3 to greatly improve the stability, and synergistic effect triggers electronic interactions to enhance the catalytic activity. Thus, this oxyhydroxide coating strategy can shed a new light on improving the performance of WO2- and MxWO3-based materials in alkaline medium.