氧电极催化剂钙钛矿氧化物的制备及催化性能

The preparation and catalytic properties of perovskite-type oxides for oxygen electrode

采用无定形前驱体法,以苹果酸作络合剂,制备了La1-xCaxCoO3和La1-xSrxMnO3系列钙钛矿氧化物,运用差热分析(DTA)和X射线衍射分析(XRD),探讨了催化剂的制备条件,制备La1-xCaxCoO3的最佳pH值为3.0,煅烧温度为650℃,制备La1-xSrxMnO3的pH值影响不大,煅烧温度为600℃。电化学研究结果表明,La0.6Ca0.4CoO3和La0.8Sr0.2MnO3具有较好的催化活性。

The perovskite-type oxides （La1-xCaxCoO3 and La1-xSrxMnO3）were obtained by a sol-gel route, using malic acid as precursor. XRD and DTA were applied to study the preparation conditions of the oxides. The best pH is 3.0 for the La1-xCaxCoO3 oxides but has little effects for the La1-xSrxMnO3 oxides. The gel-like mass obtained was calcined at 650℃ to get the La1-xCaxCoO3 oxides and 600 ℃ to get the La1-xSrxMnO3 oxides. The results of electrochemical properties show that La1-xCaxCoO3 and La1-xSrxMnO3 have better catalytic activities.