粉煤灰基催化材料提升电子迁移率的制备机理

Preparation and mechanism of fly ash based catalyticmaterials for enhancing electron mobility

固体表面催化材料提升电子迁移率的制备机理目前缺少系统研究。以粉煤灰为研究对象,采用湿式磁选、高能球磨法和等离子体放电改性等方法联合改性以提升材料电子迁移率,并探讨其制备机理。实验结果表明,最佳实验参数组合为用1.2 T磁棒磁选3次,然后在转速550 r/min下球磨30 h,最后在放电间隙3 mm、放电长度200 mm、放电功率130 W和改性时间20 min条件下等离子体放电改性。得到的粉煤灰样品电阻率下降到27.92 MΩ·cm,比原始粉煤灰的电阻率提高四个数量级。该研究表明构筑完善且连续的导电网络是提升材料导电性能与电子迁移率的前提。

The preparation mechanism of solid surface catalytic materials to enhance electron mobility has not been systematically studied.Fly ash was modified by wet magnetic separation,high energy ball milling and plasma discharge to improve the material's electron mobility,and the preparation mechanism was discussed.The experimental results show that the optimal combination of experimental parameters is magnetic separation with 1.2 T magnetic rod for 3 times,then ball milling at 550 r/min for 30 h,and finally plasma discharge modification under the conditions of discharge gap 3 mm,discharge length 200 mm,discharge power 130 W and modification time 20 min.The resistivity of the obtained fly ash sample is reduced to 27.92 MΩ·cm,which is four orders of magnitude higher than that of the original fly ash.This study shows that a perfect and continuous conductive network is a prerequisite for improving the conductivity and electron mobility of materials.