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An Atmospheric Pressure Plasma Setup to Investigate the Reactive Species Formation

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Published on: November 3, 2016

Plasma electrochemistry: voltammetry in a flame plasma electrolyte.

Atif Elahi¹, Daren J Caruana

¹Department of Chemistry, University College London, UK.

Physical Chemistry Chemical Physics : PCCP

|December 11, 2012

Summary

This study explores redox processes in flame plasma electrolytes using cyclic voltammetry. Solid-gas interface electron transfer is similar to solid-liquid interfaces, with gas-phase mass transport being a key factor.

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Area of Science:

Electrochemistry
Plasma Science
Materials Science

Background:

Conventional electrochemistry is limited by solvent electrolysis at high overpotentials.
Flame plasma electrolytes offer a unique medium for electrochemical studies due to the absence of solvents.
Understanding electron transfer at solid-gas interfaces is crucial for advanced electrochemical applications.

Purpose of the Study:

To investigate dynamic electrochemical measurements in a flame plasma electrolyte.
To understand electron transfer mechanisms at the solid-gas interface.
To develop a phenomenological model for redox processes in this system.

Main Methods:

Utilizing cyclic voltammetry for dynamic electrochemical measurements.
Developing a novel yttria-stabilized zirconia (YSZ) reference electrode for high-temperature (1100 K) operation.
Analyzing the effects of electrode surface area, material, and scan rate on redox features.

Main Results:

Achieved a wide operational potential window (1 to -9 V) without solvent electrolysis.
Observed defined and reproducible redox processes in the flame plasma electrolyte.
Identified Faradaic current peaks and proposed a model for solid-gas interface redox processes.

Conclusions:

Redox processes at the solid-gas interface in flame plasma electrolytes resemble those at solid-liquid interfaces.
Gas-phase mass transport significantly influences electrochemical behavior.
Migration effects, not oxidation, dominate in the absence of solvent.