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采用碳酸盐沉淀热分解法,柠檬酸固化热分解法和硝酸盐直接混合热分解法分别制备了La_(0.5)Sr_(0.5)CoO_3,LaCoO_3,SrCoO_3等钙钛矿型氧化物,并通过热重分析、x—射线衍射粉末图、BET比表面及比电阻测定,对不同组成的氧化物的制备条件作了比较。采用柠檬酸固化热分解法能在较低的灼烧温度下(600℃)得到比表面较大的LaCoO_3,La_(0.5)Sr_(0.5)CoO_3钙钛矿型氧化物。混入乙炔黑等导电物质后的La_(0.5)Sr_(0.5)CoO_3氧化物电极对氧过原有较好的催化活性。
La 0.5 Sr 0.5 CoO 3, LaCoO 3, SrCoO 3 and other perovskite oxides were prepared by carbonate precipitation thermal decomposition, citric acid thermal decomposition and nitrate direct thermal decomposition respectively. Reanalysis, x-ray diffraction powder pattern, BET specific surface area and specific resistance measurement, the preparation conditions of oxides with different compositions were compared. The LaCoO_3, La_ (0.5) Sr_ (0.5) CoO_3 perovskite oxides with larger specific surface area can be obtained at lower burning temperature (600 ℃) by citric acid solidification pyrolysis method. The La 0.5 Sr 0.5 CoO 3 oxide electrode mixed with conductive materials such as acetylene black has better catalytic activity on oxygen.