This report designed a Pt/LaCoO₃ composite electrocatalyst for electrochemical water splitting: LaCo_0.94Pt_0.06O₃ was prepared via the sol-gel method and then dealt with a heat treatment in 10% H2/Aratmosphere at 350°C. The XRD, HRTEM, SEM and XPS results show that the Pt nanoparticles (NPs)exsolve from the perovskite lattice and are homogeneously distributed on the surface. The HER and OER performance of the samples was tested in 1 mol.L^-1 KOH solution and the findings illustrate that comparedwith LaCo_0.94Pt_0.06O₃, Pt/LaCoO₃ owes better OER and HER performance. The improved performance couldbe up to the higher ratio of oxygen vacancies and improved charge transfer. Furthermore, the synergistic effect between Pt NPs and the LaCoO₃ matrix may also take a leading part in the future.

After the exsolution, the Pt/LaCoO₃ is well-developed with smooth surface and some nanoparticles are homogeneously distributed on the surface of the samples. The exsolved Pt nanoparticles can accelerate the electron exchange process between the matrix and its adsorbed intermediates, and ultimately promote the electrochemical reaction kinetics.