Asymmetric discharges of dielectric barrier discharge in atmospheric air

Abstract

We report in this Letter a kind of asymmetric discharge mode in positive and negative half-cycles of dielectric barrier discharge in ambient air. This phenomenon is characterized by homogeneous and filamentary discharges occurring alternately in the two half-cycles, using two different materials of alumina ceramic and quartz as the dielectric barrier at each side. The discharge current waveforms, discharge images, optical emission spectra, and the averaged electron energy are significantly different for the asymmetric discharges. It is suggested that the seed electrons and secondary electron emission from the different dielectric materials acting as the temporary cathode are responsible for the different discharge modes.

The effect of bending angle on a flexible electrode DBD plasma under sinusoidal excitation

“…However, there is a sharp increase in electrode temperature to 76 • C and a decrease in O 3 concentration above 5.7 kV for the 180 • configuration demonstrating that considerably larger part of energy dissipated at heat at these conditions. This phenomenon can be attributed to the discharge mode conversion [32,33]. The differences in the discharge current occur as it was shown in figure 5, where the intensity of micro discharges increases at higher voltages.…”

“…results in the higher heat dissipation above 5.4 kV [32,33]. Thus, the bending angle significantly redistributes the power portion lost for electrode heating and used for ozone generation.…”

The application of plasma technology for the preparation of supercapacitor electrode materials

“…31 Plasma generation and its role are performed in a variety of ways (Fig. 1b), 40 including dielectric barrier discharge (DBD), 41 glow discharge, 42 microwave discharge, 43 radio frequency discharge, 44 spark discharge, 45 corona discharge, 46 etc . Due to the different external control parameters (electrode structure, power supply, and type of working gas), the plasma characteristics generated by gas discharge are also different.…”

Discharge mode conversion of bending flexible electrodes

“…When the electrodes are not bent, the overall space electric field presents a uniform distribution state. By increasing the bending angle, the bending radius decreases, the concentration of the local electric-field distribution in the space would be enhanced, which would cause the discharge mode conversion [14][15][16]. The electric-field simulation of the bent electrode under different angles is shown in fig.…”