Chemistry in nanosecond plasmas in water
- Discharges in liquids are the basis of a range of applications in electrochemistry, wastewater treatment, or plasma medicine. One advantage of discharges in water is their ability to produce radicals and molecules directly inside liquid with a high conversion efficiency. In this study, \(H_{2}O_{2}\) production in a 10 ns pulsed discharge in water is investigated. The dynamic of these discharges is based on plasma ignition directly inside liquid followed by the formation of a bubble that expands in time before it eventually collapses. This sequence can be well described by cavitation theory. \(H_{2}O_{2}\) is produced using different plasma conditions varying the treatment time, the pulse frequency between 1 and 100 Hz, and the applied voltage in a range from 15–30 kV. The resulting \(H_{2}O_{2}\) concentration is measured using absorption spectroscopy ex situ based on a colorimetry method. The results indicate that the main parameter controlling the \(H_{2}O_{2}\) production constitutes the applied voltage. The measured concentrations are compared with a global chemistry model simulating the chemistry involved during a single pulse using pressures and temperatures from the cavitation model. In addition, a global chemical equilibrium model for \(H_{2}O_{2}\) creation is evaluated as well. The models show a good agreement with the data. The energy efficiency for the production of \(H_{2}O_{2}\) reaches values up to 2 g/kWh.
Author: | Laura ChauvetORCiDGND, Chaiyasit NenbangkaeoGND, Katharina GrosseORCiDGND, Achim von KeudellORCiDGND |
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URN: | urn:nbn:de:hbz:294-80903 |
DOI: | https://doi.org/10.1002/ppap.201900192 |
Parent Title (English): | Plasma Processes and Polymers |
Publisher: | Wiley |
Place of publication: | Weinheim |
Document Type: | Article |
Language: | English |
Date of Publication (online): | 2021/05/19 |
Date of first Publication: | 2020/01/16 |
Publishing Institution: | Ruhr-Universität Bochum, Universitätsbibliothek |
Tag: | H2O2 production; cavitation theory; discharge in water; global chemistry model; nanosecond pulsed discharge |
Volume: | 17 |
Issue: | 6, Artikel e1900192 |
First Page: | e1900192-1 |
Last Page: | e1900192-14 |
Note: | Dieser Beitrag ist auf Grund des DEAL-Wiley-Vertrages frei zugänglich. |
Institutes/Facilities: | Institut für Experimentalphysik II, Reaktive Plasmen |
Dewey Decimal Classification: | Naturwissenschaften und Mathematik / Physik |
open_access (DINI-Set): | open_access |
faculties: | Fakultät für Physik und Astronomie |
Licence (English): | Creative Commons - CC BY-NC 4.0 - Attribution-NonCommercial 4.0 International |