Synthesis of La0.2Sr0.8CoO3 and its electrocatalytic activity for oxygen evolution reaction in alkaline solution

The perovskite-type oxide La0.2Sr0.8CoO3 was prepared by sol-gel process, which particle was irregular cube with particle size between 50 and 60 nm. A novel air electrode for oxygen evolution reaction prepared by using La0.2Sr0.8CoO3 as a catalyst has a current density of 152 mA cm−2 when the potential is 0.7 V (vs. Hg/HgO) in an alkaline medium (6 mol L−1 KOH) under the air atmosphere. The research results show that n (C6H8O7): n (M) = 1:1, pH = 9, calcination temperature 800 °C, 5 h calcination time is the best preparation process conditions.