• WENYU LI

      Articles written in Journal of Chemical Sciences

    • Enhanced oxygen and hydrogen evolution activities of Pt/LaCoO3 perovskite oxide via in-situ exsolution of Pt nanoparticles

      WENYU LI YUMEI ZHU WEI GUO HANWEN XU CAIRONG GONG GANG XUE

      More Details Abstract Fulltext PDF

      This report designed a Pt/LaCoO3 composite electrocatalyst for electrochemical water splitting: LaCo0.94Pt0.06O3 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 LaCo0.94Pt0.06O3, 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.

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