The lanthanide perovskite oxide LaCoO3-x was selected as the research object. Lanthanum strontium cobalt perovskite catalysts with different doping ratios of Sr were prepared by the sol-gel method. The surface chemical composition and oxygen species content of the catalyst were tested by X-ray diffraction (XRD) and X-ray photoelectron spectroscopy (XPS) characterization methods. The linear sweep voltammetry (LSV) test and electrochemical impedance spectroscopy (EIS) were used to explore the effect of different Sr ion doping ratio on the electrocatalytic activity of oxygen reduction reaction. The results showed that A-site Sr doping was an effective method to increase the oxygen vacancy of perovskite materials. When the doping ratio of Sr was 0.5 (La0.5Sr0.5CoO3-x), the oxygen reduction reaction activity of the catalyst was higher than other samples and its stability was far superior than commercial Pt/C."/>
Regulating Surface Oxygen Vacancy of Lanthanum Cobaltate by Strontium Doping for Electrocatalytic Oxygen Reduction Reaction
Abstract
The lanthanide perovskite oxide LaCoO3-x was selected as the research object. Lanthanum strontium cobalt perovskite catalysts with different doping ratios of Sr were prepared by the sol-gel method. The surface chemical composition and oxygen species content of the catalyst were tested by X-ray diffraction (XRD) and X-ray photoelectron spectroscopy (XPS) characterization methods. The linear sweep voltammetry (LSV) test and electrochemical impedance spectroscopy (EIS) were used to explore the effect of different Sr ion doping ratio on the electrocatalytic activity of oxygen reduction reaction. The results showed that A-site Sr doping was an effective method to increase the oxygen vacancy of perovskite materials. When the doping ratio of Sr was 0.5 (La0.5Sr0.5CoO3-x), the oxygen reduction reaction activity of the catalyst was higher than other samples and its stability was far superior than commercial Pt/C.
LONG Yu,MA Kui,SONG Lei et al. Regulating Surface Oxygen Vacancy of Lanthanum Cobaltate by Strontium Doping for Electrocatalytic Oxygen Reduction Reaction[J]. 化学反应工程与工艺, 2022, 38(2): 126-131.
LONG Yu,MA Kui,SONG Lei et al. Regulating Surface Oxygen Vacancy of Lanthanum Cobaltate by Strontium Doping for Electrocatalytic Oxygen Reduction Reaction[J]. Chemical Reaction Engineering and Technology, 2022, 38(2): 126-131.
