μs and ns twin surface dielectric barrier discharges operated in air: from electrode erosion to plasma characteristics

Abstract

Electrode erosion through continual long-timescale operation (60 minutes) of identical twin surface dielectric barrier discharges (twin SDBDs) powered either by a microsecond (μs) or a nanosecond timescale (ns) voltage source is investigated. The twin SDBDs are characterized using current-voltage measurements, optical emission spectroscopy, and phase integrated ICCD imaging. The temporally and spatially averaged gas temperature, consumed electric power, and effective discharge parameters (reduced electric field, and electron density) are measured. The μs twin SDBD is shown to operate in a filamentary mode while the ns twin SDBD is shown to operate in a more homogeneous mode (i.e. non filamentary). Despite a similarity of the effective discharge parameters in both the μs and ns twin SDBD, erosion of the nickel coated electrodes caused by operation of the twin SDBD differs strongly. Only the formation of a moderate number of nickel oxide species is observed on the surface of the ns twin SDBD electrodes. In contrast, the nickel coated electrodes are locally melted and considerably higher densities of oxides are observed around the eroded areas of the μs twin SDBD, due to the filamentary nature of the discharge.

A scalable twin surface dielectric barrier discharge system for pollution remediation at high gas flow rates

“…The fundamental plasma parameters and characteristics of our discharge operated in single-electrode systems were previously investigated by Offerhaus et al and Kogelheide et al by the use of optical emission spectroscopy (OES). 8,18,19 Nguyen-Smith et al 20 investigated the same SDBD geometry with respect to electrode erosion using ns and μs voltage excitation. For this, they measured the averaged gas temperature, the consumed electric power, the reduced electric field and the electron density.…”

Analysis of the effects of complex electrode geometries on the energy deposition and temporally and spatially averaged electric field measurements of surface dielectric barrier discharges

“…This results in spatially and temporally averaged values which is why the term “effective reduced electric field” is used. [ 31 ] This treatment is necessary because of the stochastic nature of filaments in both time and space. Additionally, the light generated by a single filament is not enough to generate a meaningful emission signal.…”

Plastic Waste Recycling─A Chemical Recycling Perspective

“…This process has received comparatively little attention in the context of plastic recycling, but it offers a wide range of possibilities to make plastic recycling more economical and eco-friendly. The primary benefit of cold plasma technology is its high energy-saving potential as indicated by several other plasma applications like CO 2 , − N 2 , , and methane conversion, as well as the oxidation of volatile organic compounds. − This is due to the fact that cold plasma operates far from thermodynamic equilibrium, resulting in selective coupling of energy into free electrons while ions and gas molecules remain close to room temperature . This means in nonthermal plasmas, electrons have much higher temperatures than the heavy particles.…”