An all-solid-state polymeric membrane Pb²⁺-selective electrode with bimodal pore C₆₀ as solid contact

Area of Science:

• Electrochemistry
• Materials Science
• Environmental Science

Background:

• Development of all-solid-state ion-selective electrodes (ISEs) is crucial for portable and stable electrochemical sensing.
• Traditional ISEs often suffer from potential instability and interference issues.
• Solid contacts are essential components in all-solid-state ISEs, influencing electrode performance.

Purpose of the Study:

• To develop a novel all-solid-state polymeric membrane lead(II) ion-selective electrode (Pb(2+)-ISE).
• To investigate the suitability of bimodal pore C60 (BP-C60) as a solid contact material for Pb(2+)-ISEs.
• To evaluate the performance and stability of the developed BP-C60 based Pb(2+)-ISE.

Main Methods:

• Electrochemical deposition of bimodal pore C60 (BP-C60) film on a glassy carbon electrode.
• Characterization of BP-C60 film using cyclic voltammetry and electrochemical impedance spectroscopy.
• Fabrication and electrochemical performance evaluation of the all-solid-state Pb(2+)-ISE.

Main Results:

• BP-C60 film exhibited favorable properties, including large double layer capacitance and fast charge-transfer capability.
• The developed all-solid-state BP-C60-based Pb(2+)-ISE demonstrated a Nernstian response over a wide concentration range (1.0×10(-9) to 1.0×10(-3)M).
• The electrode achieved a low detection limit of 5.0×10(-10)M and showed excellent potential stability, insensitivity to common interferences (O2, CO2, light), and good agreement with anodic stripping voltammetry in real water samples.

Conclusions:

• Bimodal pore C60 is a promising solid contact material for constructing stable and sensitive all-solid-state ion-selective electrodes.
• The absence of a water layer at the interface enhances electrode stability.
• The developed Pb(2+)-ISE offers a reliable method for lead ion determination in environmental water samples.