Junction-less reference electrode for potentiometric measurements obtained by buffering pH in a conducting polymer...

Area of Science:

• Electrochemistry
• Materials Science
• Polymer Chemistry

Background:

• Reference electrodes are crucial for stable potentiometric measurements.
• Conventional reference electrodes often suffer from junction potentials and limited solvent compatibility.
• Conducting polymers (CPs) offer potential for novel electrode designs.

Purpose of the Study:

• To develop a stable, miniaturized reference electrode based on conducting polymers (CPs).
• To minimize ionic and redox sensitivity while maintaining pH buffering properties.
• To demonstrate the electrode's utility in potentiometric measurements, including titrations in mixed solvents.

Main Methods:

• Synthesizing conducting polymers doped with pH buffering ligands.
• Selecting and adjusting CP and ligand properties to control sensitivity.
• Characterizing the electrode's potential stability across a pH range.
• Utilizing the CP reference electrode in potentiometric titrations.

Main Results:

• The developed CP electrode exhibited stabilized electric potential at the interface over a specific pH range.
• The electrode functioned as a pseudo-reference electrode in amphiprotic solvents like water-alcohol mixtures.
• Successful titration of sulfates with lead(II) in a water-methanol solution was demonstrated using CP-based electrodes.

Conclusions:

• The CP-based reference electrode provides a stable and reliable potential, overcoming limitations of conventional electrodes.
• Its junction-less and miniaturized design facilitates easier maintenance and opens possibilities for advanced sensor applications.
• This technology enables novel electrochemical analyses in challenging solvent systems.