In this paper, the decomposition of pure CO2 into CO and O2 were carried out in a segmented electrode DBD micro-plasma reactor at ambient pressure. With the assistance of gas chromatography, the influence of key factors like electrode interval and barrier thickness on the DBD filamentary behavior and CO2 decomposition process were investigated systematically. Meanwhile, the detailed electrical characterization during discharge process was also performed. The results indicated that a relatively higher CO2 conversion and energy efficiency could be obtained at the propitious condition of longer interval between adjacent electrodes and smaller barrier thickness, and the highest CO2 conversion and corresponding energy efficiency are 16.9% and 3.6%, respectively, at the condition of an applied voltage of 18 kV and 1.0 mm barrier thickness. Longer electrode interval can result in an increase in plasma density as well as enhance fringe effect. While the smaller barrier thickness, the smaller corresponding gas breakdown voltage, which meant that more electrical power was used for gas excitation. Accordingly, more energetic electrons were generated and more collisions between the electrons and CO2 molecules occurred. These were considered to be main reasons for enhanced CO2 decomposition process.

中文翻译：

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分段电极微等离子体DBD反应器中电极间距和阻挡层厚度对CO2分解的影响

在本文中，在环境压力下，在分段电极 DBD 微等离子体反应器中，将纯 CO2 分解为 CO 和 O2。在气相色谱的辅助下，系统地研究了电极间距和势垒厚度等关键因素对 DBD 丝状行为和 CO2 分解过程的影响。同时，还进行了放电过程中的详细电学表征。结果表明，在相邻电极间距较长、势垒厚度较小的有利条件下，可以获得较高的CO2转化率和能量效率，最高CO2转化率和相应的能量效率分别为16.9%和3.6%。施加电压为 18 kV 和势垒厚度为 1.0 mm 的条件。更长的电极间隔会导致等离子体密度的增加以及边缘效应的增强。而阻挡层厚度越小，对应的气体击穿电压越小，这意味着更多的电能用于气体激发。因此，产生了更多高能电子，并且电子和 CO2 分子之间发生了更多碰撞。这些被认为是增强 CO2 分解过程的主要原因。