Cocktail effect in high-entropy perovskite oxide for boosting alkaline oxygen evolution

Abstract

Due to the cocktail effect, La_0.5Sr_0.5Mn_0.15Fe_0.15Co_0.4Ni_0.15Cu_0.15O₃ perovskite oxide hollow nanofibers exhibit excellent intrinsic activity for alkaline oxygen evolution reaction (OER) with a small overpotential of 309 mV (10 mA cm⁻²). Operando electrochemical Raman spectra provide evidence for the generation of crucial intermediates on specific active sites in this high-entropy oxide system. This work will guide the rational utilization of the cocktail effect in multi-site electrocatalysts.