Evidence of Faradaic Reactions in Electrostatic Atomizers

Area of Science:

• Electrochemistry
• Fluid Dynamics
• Materials Science

Background:

• Understanding the polarized layer near electrodes is crucial for electrostatic atomizers (EAs).
• Standard theories do not account for leak currents observed in EAs.
• The source of electric charge in EA jets is the electrode's polarized layer.

Purpose of the Study:

• To investigate the role of faradaic reactions in controlling electric current in EAs.
• To demonstrate that electrode material choice influences EA performance.
• To provide a foundation for a more comprehensive theory of EA operation.

Main Methods:

• Experiments were conducted using pin-like cathodes (stainless steel, brass) and conical nozzle anodes (copper, stainless steel, brass).
• Measurements included spray current, leakage current, and total current.
• Systematic variation of electrode materials to observe effects on electrical characteristics.

Main Results:

• Different electrode material combinations resulted in distinct spray, leakage, and total currents.
• Faradaic reactions at the electrodes were identified as the controlling factor for electric current.
• The total electric current generated by EAs is controllable by selecting specific cathode and anode materials.

Conclusions:

• The electric current in electrostatic atomizers is governed by faradaic reactions at the electrodes.
• The choice of cathode and anode materials significantly impacts EA electrical performance.
• This study advances the understanding of EA operational mechanisms through material-dependent electrochemical control.