Ruthenium dioxide nanoparticles as a high-capacity transducer in solid-contact polymer membrane-based pH-selective...

Area of Science:

• Electrochemistry
• Materials Science

Background:

• Ion selective electrodes (ISEs) are crucial for chemical sensing.
• Developing robust and portable ISEs remains an ongoing challenge.
• Solid-contact electrodes offer advantages over traditional designs.

Purpose of the Study:

• To introduce a novel design for ion selective electrodes using ruthenium dioxide nanoparticles.
• To evaluate the performance of these modified electrodes for pH sensing.
• To compare the properties of modified electrodes with existing technologies.

Main Methods:

• Incorporation of ruthenium dioxide (RuO2) nanoparticles into solid-contact electrodes.
• Potentiometric measurements to assess response to hydrogen ions.
• Chronopotentiometry to evaluate electrode resistance and capacitance.
• Stability and potential drift analysis.

Main Results:

• Ruthenium dioxide nanoparticles significantly improved potentiometric response without redox interference.
• A Nernstian slope of 59 mV/decade was achieved for hydrogen ions across a broad pH range (2-12).
• Electrodes exhibited low resistance, high capacitance (1.12 mF), and excellent stability with minimal potential drift (0.89 μV∙s⁻¹).

Conclusions:

• The novel RuO2-modified electrodes demonstrate performance comparable to glass electrodes.
• These electrodes are smaller, less fragile, and easier to use than traditional glass electrodes.
• This approach offers a promising advancement in the design of practical ion selective electrodes.