通过水热法合成Zn-MOF材料，并将其高温热解制备得到ZnO@CN纳米催化剂。通过X射线衍射谱、扫描电子显微镜表征了ZnO@CN的结构和组成。为了探究热解温度对ZnO@CN催化性能的影响，将制得的Zn-MOF材料在不同温度下热解分别得到ZnO@CN-600、ZnO@CN-700、ZnO@CN-800、ZnO@CN-900，通过氧还原反应测试其催化活性。结果表明，热解温度为900℃时制得的ZnO@CN-900起始电势和半波电势分别为0.890 V和0.780 V。动力学研究结果表明，ZnO@CN-900的电子转移数约为4，证明氧气分子在ZnO@CN-900催化剂表面还原采用四电子路径。

Zn-MOF material is synthesized by using hydrothermal method,and then is pyrolyzed at high temperature to prepare nitrogen-doped carbon nano catalysts (ZnO@CN).The structure and composition of ZnO@CN catalyst are analyzed and characterized by XRD and SEM.In order to investigate the effect of pyrolysis temperature on the catalytic performance of ZnO@CN,the prepared Zn-MOF materials are pyrolyzed at different temperatures to prepare a series of catalysts:ZnO@CN-600,ZnO@CN-700,ZnO@CN-800,ZnO@CN-900.Subsequently,the catalytic activities of these catalysts are tested by the reduction reaction of oxygen.The experimental results indicate that ZnO@CN-900 prepared at 900℃ exhibits optimal catalytic activity with the onset potential at 0.89 V and half-wave potential at 0.78 V.In addition,the kinetic studies show that the electron transfer number of ZnO@CN-900 is around 4,which verifies that the reduction process of oxygen molecular on the surface of ZnO@CN-900 employs a four-electron pathway.

陈君(1987-),女,硕士,助教,研究方向为材料后处理及色谱分析,chenjun097@163.com。