Abstract
Discharge mode is an important parameter for ozone synthesis by dielectric barrier discharge (DBD). Currently, it is still challenging to stably generate glow discharge with oxygen at atmospheric pressure. In this paper, a DBD reactor with a layer of silver placed between the electrode and the dielectric layer (SL-DBD) was developed. Experimental results show that both streamer and glow corona discharge were stably generated under sinusoidal excitation with a 0.5 mm discharge gap in a parallel-plate DBD, due to the increased electric field strength in the discharge gap by the silver layer. It was also found that, in the SL-DBD reactor, glow corona discharge enhances the discharge strength by 50 times. The spectral peak of O at 777 nm in SL-DBD is increased to 28,800, compared with 18,389 in a reactor with a streamer only. The SL-DBD reactor produces ozone with a concentration of as high as 150 g/m3 and shows good stability in an 8 h durability test.
Highlights
Dielectric barrier discharge (DBD) plasma is an efficient method for ozone synthesis, which has been widely used for air pollution control [1,2,3,4,5] and water treatment [6,7,8,9,10]
The results showed that streamer and glow discharge generate alternately only when the dielectric layer is covered on the ground electrode
The reason for generating such a discharge mode is that electrons are absorbed by the anode, and the ions gathered near the high voltage electrode surface are pushed toward the dielectric layer
Summary
Dielectric barrier discharge (DBD) plasma is an efficient method for ozone synthesis, which has been widely used for air pollution control [1,2,3,4,5] and water treatment [6,7,8,9,10]. Depending on the electric field intensity in the discharge gap, different discharge modes, such as Townsend discharge, streamer discharge, corona discharge, and glow discharge can be generated. Li et al [22] found that the discharge mode changes from Townsend discharge to glow discharge as the electric field strength increases under sinusoidal excitation. When the electric field strength in the discharge gap is increased, side effects such as partial discharge occurs at the contact surface between the dielectric layer and the electrode. A DBD reactor with a layer of silver placed between the electrode and the dielectric layer (SL-DBD) was developed to increase the electric field strength in the discharge gap without partial discharge side effects.
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