JOURNAL ARTICLE

Mechanisms of OH and H2O2 formation in the liquid phase induced by an atmospheric pressure plasma jet with oxygen introduction.

  • Published In: Physics of Plasmas, 2025, v. 32, n. 8. P. 1 1 of 3

  • Database: Academic Search Ultimate 2 of 3

  • Authored By: Xi, Wenhao; Zhang, Huixue; Ren, Wenxue; Li, Jingwen; Chen, Nuo; Chen, Mian; Han, Wei; Cheng, Cheng 3 of 3

Abstract

This article investigates the generation and transformation mechanisms of plasma-induced reactive oxygen species (ROS), specifically hydroxyl radicals (OH) and hydrogen peroxide (H₂O₂), in gas–liquid phase environments under atmospheric pressure plasma conditions. Two plasma discharge modes were studied: Nor mode (direct plasma-liquid contact) and Cut mode (plasma cutoff by a conductor), using helium and helium-oxygen gas mixtures. The study found that liquid-phase OH concentrations are significantly higher in the Nor mode, primarily generated by direct interactions of high-energy plasma particles with water and dissolution of gas-phase OH, whereas liquid-phase H₂O₂ concentrations are greater in the Cut mode, mainly formed by dissolution of gas-phase H₂O₂. Introducing oxygen increased atomic oxygen production but suppressed OH and H₂O₂ formation, with atomic oxygen in the liquid phase interfering with conventional OH detection methods. These findings clarify the distinct pathways of ROS formation in plasma-liquid systems and highlight the influence of oxygen on reactive species distribution, providing insights relevant for optimizing plasma applications in medicine and environmental technologies.

Additional Information

  • Source:Physics of Plasmas. 2025/08, Vol. 32, Issue 8, p1
  • Document Type:Article
  • Subject Area:Earth and Atmospheric Sciences
  • Publication Date:2025
  • ISSN:1070-664X
  • DOI:10.1063/5.0268974
  • Accession Number:187641162
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