Gastight Hydrodynamic Electrochemistry: Design for a Hermetically Sealed Rotating Disk Electrode Cell

Area of Science:

• Electrochemistry
• Electrocatalysis
• Analytical Chemistry

Background:

• Rotating disk electrodes (RDEs) are vital for electrocatalytic reaction studies.
• Gaseous product analysis in RDE experiments is challenging due to potential gas leaks.
• Existing RDE cell designs often compromise gastight integrity during electrode rotation.

Purpose of the Study:

• To develop and validate a novel hermetically sealed electrochemical cell for RDE experiments.
• To enable simultaneous electrode rotation and gastight headspace analysis.
• To improve the accuracy of gaseous product quantification in electrocatalytic studies.

Main Methods:

• A new RDE cell design utilizing magnetic coupling for rotation was developed.
• The cell was calibrated using a tachometer to verify rotation speed accuracy.
• Hydrodynamic measurements of potassium ferrocyanide reduction were performed to validate performance.
• Faradaic efficiencies for oxygen evolution were measured in a rotating, gastight environment.

Main Results:

• The new cell design successfully maintains a hermetically sealed environment during electrode rotation.
• Measured limiting currents for potassium ferrocyanide reduction align with Levich equation predictions and conventional RDE data.
• High Faradaic efficiencies (~95%) for oxygen evolution were achieved, confirming the cell's gastight performance.

Conclusions:

• The developed hermetically sealed RDE cell effectively addresses gas leak challenges in RDE experiments.
• This innovation facilitates accurate headspace analysis and quantification of gaseous products in electrocatalysis.
• The cell design offers a reliable platform for advanced electrochemical studies requiring controlled environments.