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Related Experiment Video

Updated: Sep 20, 2025

Building Langmuir Probes and Emissive Probes for Plasma Potential Measurements in Low Pressure, Low Temperature Plasmas

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Published on: May 25, 2021

Plasma parameters and the reduction potential at a plasma-liquid interface.

Trey Oldham¹, Shurik Yatom², Elijah Thimsen^1,3

¹Department of Energy, Environmental & Chemical Engineering, Washington University in St. Louis, St. Louis, MO, USA. elijah.thimsen@wustl.edu.

Physical Chemistry Chemical Physics : PCCP

|June 6, 2022

Summary

Researchers developed a method to control reduction potential in plasma-liquid systems, crucial for redox reactions. This study links plasma properties to the liquid

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Area of Science:

Plasma Science
Electrochemistry
Surface Chemistry

Background:

Nonthermal plasma-liquid interfaces generate reactive species for redox reactions.
Controlling redox potential in plasma systems is challenging without external circuits.
The liquid interface develops a negative charge, influencing potential.

Purpose of the Study:

To establish a framework correlating plasma parameters to the reduction potential at the plasma-liquid interface.
To investigate the relationship between electron density, electron temperature, and reduction potential.
To validate a model for predicting reduction potential in plasma-treated liquids.

Main Methods:

Utilized laser Thomson scattering to measure argon plasma jet parameters (electron density, electron temperature).
Employed reference electrodes to measure the reduction potential at the plasma-liquid interface.
Applied an analytical model to predict reduction potential based on plasma parameters.

Main Results:

Successfully correlated plasma jet parameters (electron density, electron temperature) to the reduction potential.
Measured reduction potentials closely matched model-predicted values.
Demonstrated a method for tuning redox potential in plasma-liquid systems.

Conclusions:

The floating potential of the liquid interface can be modeled using plasma parameters.
This work provides a pathway for controlling electrochemical reactions at plasma-liquid interfaces.
The findings are crucial for applications in plasma medicine, synthesis, and environmental remediation.