Zn-空气电池中二维与三维结构碳负载Mn3O4的催化性能比较

采用湿法浸渍将Mn3O4负载到不同碳材料的表面, 测试了这些复合材料用于空气电极催化剂的电催化性能. 通过充放电和循环伏安等电化学测试发现, 具有三维孔道结构的介孔碳材料(CMK-3)的催化性能远比二维孔道结构的介孔碳(OMC)的好. 从透射电子显微镜观察发现, 氧化锰粒子均负载在碳的外表面, 位于三维孔道外表面的氧化锰可以与电解液和碳孔道内的氧气同时接触. 这种结构产生了大量有效的三相反应界面, 从而达到良好的催化效果.

Comparison of Catalytic Performance of Mn3O4-loaded Two-dimensional and Tree-dimensional Msoporous Carbon Mterials in Znc-air Bttery

Mn3O4 nano-particles were loaded on the surface of different carbon materials by the wet-penetration method, and the electrocatalytic performance of these composite materials were evaluated as cathode in zinc-air battery. It was found that the mesoporous carbon (CMK-3) with three-dimensional ordered structure exhibits the better catalytic performance than that of two-dimensional ordered mesoporous carbon (OMC) by charging/discharging and cyclic voltammograms test. The images of TEM indicate that Mn3O4 nano-particles were all loaded on the outer-surface of the carbon materials. In particular, the unique structure of the Mn3O4/CMK-3 composite can provide both effective gas diffusion path and sufficient effective three-phase interface area, thus resulting in its high electrocatalytic activity for oxygen reduction.