An atmospheric pressure non‐self‐sustained glow discharge in between metal/metal and metal/liquid electrodes

• Published in: Plasma processes and polymers Vol. 17; no. 6
• Main Authors: Sremački, Ivana, Gromov, Mikhail, Leys, Christophe, Morent, Rino, Snyders, Rony, Nikiforov, Anton
• Format: Journal Article
• Language: English
• Published: Weinheim Wiley Subscription Services, Inc 01.06.2020
• Subjects: Atmospheric pressure; Chemical reactions; Direct current; Electrodes; Gas temperature; Glow discharges; liquid anode; nitrogen; non‐self‐sustained glow discharge; optical emission spectroscopy; Thermal plasmas; vibrational excitation
• ISSN: 1612-8850; 1612-8869
• DOI: 10.1002/ppap.201900191

Non‐thermal plasmas operating at high pressure attract increasing attention for a variety of applications as an alternative to conventional chemical processes. In this study, an atmospheric pressure direct current non‐self‐sustained discharge in nitrogen is investigated as a source of non‐thermal plasma capable of operating in a glow regime. The discharge is sustained between an internal source of ionization and a metal or liquid electrode and studied by electrical diagnostics as well as by spectroscopy methods. The work is focused on the determination of the discharge properties including vibrational and gas temperature. The effect of the liquid electrode on the discharge properties is studied and analyzed. The mechanisms of the discharge sustaining and pathways of nitrogen state excitation are discussed. A non‐self‐sustained discharge in N2 flow in metal/metal and metal/liquid configuration has been successfully generated at atmospheric pressure. A set of active and passive diagnostics has been applied for electrical and temperature characterization of the discharge. It is revealed that the non‐self‐sustained discharge operates in a glow regime in non‐equilibrium conditions and the main mechanism of N2 excitation is vibrational excitation