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Title: Effect of water vapor on plasma morphology, OH and H2O2 production in He and Ar atmospheric pressure dielectric barrier discharges

Journal Article · · Journal of Physics. D, Applied Physics
 [1];  [2];  [3];  [4];  [2]
  1. Univ. of Minnesota, Minneapolis, MN (United States); Tsinghua Univ., Beijing (China)
  2. Univ. of Minnesota, Minneapolis, MN (United States)
  3. Univ. of Minnesota, Minneapolis, MN (United States); Mitsubishi Electric Corporation, Hyogo (Japan)
  4. Tsinghua Univ., Beijing (China)

Although atmospheric pressure dielectric barrier discharges (DBDs) have a long history, the effects of water vapor on the discharge morphology and kinetics have not been studied intensively. We report a simultaneous investigation of discharge morphology, OH and H2O2 production in Ar and He DBDs operated at different water vapor concentrations and powers. The combined study allows us to assess the impact of the discharge morphology and power on the concentration dependence of the OH and H2O2 production. The morphology of the discharge is investigated by ICCD images and current–voltage waveforms. These diagnostics are complemented by broadband absorption and a colorimetric method to measure the gas temperature and the OH and H2O2 concentrations. The number of filaments in Ar DBD increases with increasing water concentration and power. The surface discharge part of the micro-discharge also reduces with increasing water concentration most likely due to a change in surface conductivity of the dielectric with changing water concentration. The OH density in the case of Ar is approximately double the OH density in He for similar power and water admixture. In contrast to the root square dependence of the OH density on the water concentration in He similar to diffuse RF discharges, the OH density in Ar increases for small water concentrations followed by a saturation and reduces for higher water concentrations. Furthermore, this dependence of OH density on water concentration is found to correlate with changes in discharge morphology. An analytical balance of the production and destruction mechanism of H2O2 is shown to be able to reproduce the ratio of the measured OH and H2O2 density for realistic values of electron densities.

Research Organization:
Univ. of Minnesota, Minneapolis, MN (United States)
Sponsoring Organization:
USDOE Office of Science (SC), Fusion Energy Sciences (FES)
Grant/Contract Number:
SC0001939
OSTI ID:
1787668
Journal Information:
Journal of Physics. D, Applied Physics, Vol. 50, Issue 14; ISSN 0022-3727
Publisher:
IOP PublishingCopyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 39 works
Citation information provided by
Web of Science

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Cited By (5)

Benzene transformation in two dielectric barrier discharge reactors having special arrangement journal August 2019
A chemical‐kinetic model of DBDs in Ar‐H 2 O mixtures journal March 2020
Nitrate and Hydrogen Peroxide Generated in Water by Electrical Discharges Stimulate Wheat Seedling Growth journal June 2017
Investigation of role of the discharge tube in pulse modulated surface-wave argon plasma column at atmospheric pressure by optical emission spectroscopy journal May 2019
A Review of Recent Advances of Dielectric Barrier Discharge Plasma in Catalysis journal October 2019