测试之前，样品干燥并研磨，称取少量粉末溶于无水乙醇，超声分散后取少量液体滴在铜网上，仪器工作电压为200 kV。SEM仪器所附带的能谱分析仪（EDS）来观察催化剂表面的微观形貌、尺寸大小以及元素组成分布。

Before the test, the sample was dried and ground, a small amount of powder was weighed and dissolved in anhydrous ethanol, and a small amount of liquid was dropped on the copper net after ultrasonic dispersion. The operating voltage of the instrument was 200 kV.  The energy spectrum analyzer (EDS) attached to the SEM instrument was used to observe the microscopic morphology, size and element composition distribution of the catalyst surface.