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Related Experiment Video

Updated: May 28, 2026

Total Internal Reflection Absorption Spectroscopy (TIRAS) for the Detection of Solvated Electrons at a Plasma-liquid Interface

Total Internal Reflection Absorption Spectroscopy (TIRAS) for the Detection of Solvated Electrons at a Plasma-liquid Interface

Published on: January 24, 2018

Electron-transfer reactions at the plasma-liquid interface.

Carolyn Richmonds¹, Megan Witzke, Brandon Bartling

¹Department of Chemical Engineering, Case Western Reserve University, Cleveland, Ohio 44106-7217, United States.

Journal of the American Chemical Society

|October 12, 2011

Summary

This summary is machine-generated.

This study shows that an atmospheric-pressure microplasma can replace expensive metal electrodes for initiating electrochemical reactions in water. Plasma electrons efficiently mediate electron transfer, offering a novel, metal-free approach to electrochemistry.

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Area of Science:

Electrochemistry
Plasma Science
Materials Science

Background:

Traditional electrochemical reactions rely on metal electrodes like platinum, which are costly and have limited availability.
Developing alternative, cost-effective, and sustainable electrode materials is crucial for advancing electrochemical applications.

Purpose of the Study:

To investigate the potential of atmospheric-pressure microplasma as a metal-free gaseous electrode for initiating electrochemical reactions.
To demonstrate electron-transfer mediation at the plasma-liquid interface.

Main Methods:

Utilizing an atmospheric-pressure microplasma as a gaseous electrode in contact with an aqueous solution.
Monitoring the reduction of ferricyanide to ferrocyanide mediated by plasma electrons.
Analyzing the dependence of the reduction rate on the discharge current.

Main Results:

The microplasma successfully mediated electron-transfer reactions in aqueous solution, acting as a metal-free electrode.
Ferricyanide was reduced to ferrocyanide by electrons originating from the plasma.
The rate of this electrochemical reduction was directly influenced by the discharge current of the plasma.

Conclusions:

An atmospheric-pressure microplasma can effectively function as a gaseous, metal-free electrode for electrochemical processes.
This plasma-based approach offers a new paradigm for initiating and controlling electrochemistry at the plasma-liquid interface.
This metal-free electrochemistry opens avenues for sustainable and innovative applications by leveraging gas-phase electron interactions with ionic solutions.