| Summary: | The perovskite oxide SrCoO<sub>3−x</sub> is a promising oxygen electrocatalyst for renewable energy storage and conversion technologies. Here, A, B-site Co-doped perovskite Sr<sub>0.5</sub>Ba<sub>0.5</sub>Co<sub>0.95</sub>Mn<sub>0.05</sub>O<sub>3−x</sub> nanoparticles were rationally designed and synthesized by the sol-gel method with an average size of 30–40 nm. It has a remarkable intrinsical activity and stability in 1 M KOH solution. Compared with other A-site (Sr<sub>a</sub>A<sub>1−a</sub>CoO<sub>3−x</sub> A=Ba, Ca) and B-site doped perovskite (SrCo<sub>b</sub>R<sub>1−b</sub>O<sub>3−x</sub> R=Mn, Fe, Ni, B) catalysts, Sr<sub>0.5</sub>Ba<sub>0.5</sub>Co<sub>0.95</sub>Mn<sub>0.05</sub>O<sub>3−x</sub> exhibits superior oxygen evolution reaction (OER) performance, smaller Tafel slope, and lower overpotential. The high electrochemical performance of Sr<sub>0.5</sub>Ba<sub>0.5</sub>Co<sub>0.95</sub>Mn<sub>0.05</sub>O<sub>3−x</sub> is attributed to its optimized crystal structure and the increase in the content of Co<sup>3+</sup>. This study demonstrates that highly symmetrical cubic perovskite structure catalytic displays better OER performance.
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