草酸盐湿式沉淀-煅烧分解法制备四氧化三钴及其表征

Preparation and characterization of Co_3O_4 by wet precipitation-thermal decomposition with oxalate

以氯化钴、草酸铵为原料,吐温80(Tween-80)为表面活性剂,通过湿式沉淀法合成氧化钴的前驱体,再通过热分解制备四氧化三钴。采用扫描电镜、X射线衍射仪、热分析仪分析了钴氧化物前驱体和钴氧化物的形貌、晶体结构和热分解等特征。结果表明:以草酸盐为沉淀剂制得的钴氧化物前驱体为CoC_2O_4·2H_2O,前驱体于600℃煅烧4 h后可得到较纯的四氧化三钴粉末,并且基本保持了前驱体原来的形貌,仍为针(棒)状,粒子边缘变得光滑。

The cobalt oxide precursor was prepared by wet precipitation method with cobalt chloride as cobalt source,ammonium oxalate as precipitating agent,and Tween-80 as surfactant. The Co3O4 powder was obtained by thermal decomposition method. The morphology,crystal structure and thermal decomposition of precursor particles and Co3O4 powder were characterized by scanning electron microscope,X-ray diffractometer and thermal analyzer. Results show that the precursor of cobalt oxide prepared with oxalate as precipitant is CoC2O4·2H2O. Relatively pure Co3O4 powder can be obtained when the precursor is calcined at 600 ℃ for 4 h. The Co3O4 powder basically maintains the original shape of precursor,which are still needle（rod） shape and the edge of the particles become smooth.