纳米晶型MnCo2O4的微波加热法制备及其电催化性能

以Co和Mn的醋酸盐为原料,采用共沉淀法制得草酸盐前驱物,加入一定量微波吸波剂乙炔黑后,用微波进行热处理制得复合氧化物MnCo2O4.X射线衍射和扫描电镜结果表明,产物为纳米晶型,结晶良好,纯度较高,粒径为10~20nm且分布均匀.在室温下、空气气氛中,以6mol/L的KOH溶液为电解液测试了由MnCo2O4制备的空气扩散电极对氧还原反应的催化效果.极化曲线显示,在-0.2V(vsHg/HgO)电位下,氧还原反应电流密度达96mA/cm2.为显示微波加热法的优越性,用马弗炉煅烧制备了MnCo2O4,并对两种热处理方法所得产物的物化性能进行了比较.

Synthesis of Nanocrystalline MnCo2O4 by Microwave Treatment and Its Electrocatalytic Performance

A composite oxide MnCo2O4 was prepared by microwave heating a precursor of oxalate mixture obtained by coprecipitation using manganese acetate and cobalt acetate as raw materials. X-ray diffraction and scanning electron microscopy results show that the MnCo2O4 is good nanocrystalline with high purity and 10-20 nm size. The catalytic activity of MnCo2O4 for oxygen reduction in a basic solution at room temperature was tested. The polarization curve reveals that the current density reaches 96 mA/cm2 at-0.2 V (vs Hg/HgO). In order to show the superiority of the microwave heating method, physical and chemical properties of the same product made by a conventional combustion method were also evaluated.