玻璃掺杂量对Ca0.8Sr0.2TiO3陶瓷作为介质阻挡层等离子体放电分解CO2的影响

Experimental investigation of Ca0.8Sr0.2TiO3 ceramics as dielectrics for a cylindrical dielectric barrier discharge reactor i

摘要:

通过液相烧结法成功制备出不同玻璃掺杂量的Ca0.8Sr0.2TiO3陶瓷材料，并将该陶瓷材料作为介质阻挡层在圆柱型放电反应器中分解二氧化碳。研究结果发现，随玻璃掺杂量的增加，Ca0.8Sr0.2TiO3陶瓷的表面电阻增大，但在所研究的温度范围内，Ca0.8Sr0.2TiO3的介电常数并没有随玻璃掺杂量的变化而显著变化。扫描电镜结果表明，晶粒尺度和颗粒间玻璃相厚度随玻璃掺杂量增加而增大。另外，二氧化碳的转化率和转化效率随陶瓷中玻璃量的增加而提高。进一步采用Malter效应模拟放电和介电特性，根据该模型，可以解释转化特性与陶瓷样品中玻璃含量之间的关系。

Abstract:

The Ca0.8Sr0.2TiO3 ceramics with different amounts of glass additions were successfully prepared by liquid phase sintering and used as dielectric barriers in a cylindrical dielectric barrier discharge reactor to decompose carbon dioxide at atmospheric pressure. It is found that the surface resistivity increases with increasing glass content. While the dielectric constant does not change obviously with the increase of the glass content in the investigated temperature range. The scanning electron microscope observations indicated that both the grain size and the thickness of intergranular glassy phases increase with the increase of the glass content. More importantly, the conversion rate and conversion efficiency of carbon dioxide improves with the increase of glass content in the ceramics. Furthermore, a combined discharge analysis and dielectric characterization are modeled with a Malter effect approach. From this model, it is possible to interpret the relationship between the conversion characteristics and the glass content in the ceramic samples.