Abstract
The development of an economical, green, and stable oxygen evolution reaction (OER) catalyst is the key to water splitting. Herein, perovskite fluoride KMF3 (M = Co/Fe) was synthesized in a nonaqueous system composed of oleic acid, n-hexanol, and KOH, which improved the OER performance. The synthesized sample possesses a controllable morphology, small particles, high efficiency, and synergy of multiple active sites. By successfully incorporating iron into the M site, a strong interaction between cobalt and iron was formed. The interaction of cobalt and a small amount of iron at the M-site makes this catalyst highly active for the OER reaction. Electrochemical tests show that KCo0.80Fe0.20F3 catalyst has a low overpotential of 254 mV and a Tafel slope value of 37.5 mV dec-1, which make it superior to many catalysts. The results of this paper provide a new concept of perovskite fluoride as an OER catalyst.
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