Easy conversion perovskite fluorides KCo1−xFexF3 for efficient oxygen evolution reaction

Abstract

Herein, we report an easily oxidized Co–Fe perovskite fluoride as an efficient catalyst for the oxygen evolution reaction (OER). In situ Raman spectroscopy showed that the presence of F promotes reconstruction to form highly active (Co³⁺Fe³⁺)OOH, and the current density of 10 mA cm⁻² can be achieved at the overpotential of only 118 mV in 1 M KOH aqueous solution. This work helps to understand the role of fluoride during the OER.