Perovskite-type Oxide Catalysts Applied To Dual-functional Air Electrode Materials Research

Perovskite-type oxidation is a highly efficient non-noble metal catalyst of fuel cell oxygen electrode, the catalysis is closely relative to the structure. Perovskite-type oxidation La0.5Sr0.5CoO3(LSCoO) was prepared by sol-gel method,The perovskite La0.5Sr0.5CoO3/C (LSCoO/C) material was synthesized by sol-microwave method for the first time, whose electrochemical catalytic properties was also detected.Perovskite-type oxidation LSCoO was prepared by sol-gel method, The particles were spherical with the size of 50 to 60 nm. In alkaline electrolyte with reference potential of-0.2 V(vs. HgO/Hg), current density of catalytic ORR for the material under condtions of air, was 152 mA·cm-2 respectively, and 152 mA·cm-2 for catalytic OER at 0.7 V (vs. HgO/Hg).The LSCoO/C was synthesized by sol-microwave method, The particles were spherical with the size of 15 to 25 nm and had a well distribution and morphology.In alkaline electrolyte with reference potential of-0.2 V(vs. HgO/Hg), current density of catalytic ORR for the material under condtions of air, was 157 mA·cm-2 respectively, and 142 mA·cm-2 for catalytic OER at 0.7 V (vs. HgO/Hg). It suggests LSCoO,LSCoO/C has higher performance on catalytic ORR and OER than the precious metal 5%wtPt/C catalyst, and therefor it can act as a catalytic material of bifunctional oxygen electrode.A simple zinc-air fuel cell was manufactured, with LSCoO,LsCoO/C being used as the catalyst for air diffusion electrode. We investigate the charge and discharge performance of the cell preliminarily.Present research also established a model that O2 adsorbs in CaTiO3(001), in order to explan the mechanism for O2 adsorbing in surface of CaTiO3(001), One model was established in this paper.It confirmed that the oxygen deficiency is more conducive to the surface adsorption of O2 molecules.