posted on 2021-11-23, 17:10authored byShivaraju Guddehalli Chandrappa, Prabu Moni, Dehong Chen, Guruprakash Karkera, Kunkanadu R. Prakasha, Rachel A. Caruso, Annigere S. Prakash
The design of cost-effective and
highly efficient electrocatalysts
for oxygen evolution reaction (OER) remains a key element in pursuit
of developing sustainable renewable energy conversion and storage
systems. Herein, we report the fluoride perovskite series (KNixCo1–xF3) as a promising OER catalyst. The fluoride perovskites with
merits of strong M–F polarized (M = Co, Ni) bond is beneficial
for surface reconstruction of oxy-hydroxide (M–O/MOOH) catalytic
active phase, which is the rate-determining step in the OER reaction.
The designed catalyst composition of KNi0.8Co0.2F3 (KNCF82) exhibits an outstanding OER activity, with
a smaller Tafel slope and higher OER activity than state-of-art commercial
RuO2.