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Electrochemically Switchable Polymeric Membrane Ion-Selective Electrodes.

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This study introduces a novel solid-contact ion-selective electrode capable of simultaneously detecting both cations and anions. Electrochemical switching allows the electrode to toggle between cation and anion sensing modes, offering versatile analytical capabilities.

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Area of Science:

  • Electrochemistry
  • Analytical Chemistry
  • Materials Science

Background:

  • Ion-selective electrodes (ISEs) are crucial for chemical analysis.
  • Simultaneous cation and anion sensing remains a challenge.
  • Developing switchable ISEs can enhance analytical efficiency.

Purpose of the Study:

  • To develop a novel solid-contact ion-selective electrode for simultaneous cation and anion sensing.
  • To demonstrate the electrochemical switching mechanism for sensing mode transition.
  • To optimize the performance of the switchable electrode.

Main Methods:

  • Fabrication of a polyurethane-based membrane on poly(3-octylthiophene) (POT).
  • Incorporation of a cation exchanger and lipophilic electrolyte (ETH 500).
  • Application of oxidative and reductive current pulses to switch sensing behavior.

Main Results:

  • The electrode demonstrated reversible switching between cation (tetrabutylammonium) and anion (hexafluorophosphate) sensing.
  • Oxidative pulse converted POT to POT+, inducing anion response.
  • Reductive pulse restored POT, re-establishing cation response.
  • Optimal switching achieved with specific current pulse parameters (140 μA cm⁻² for 8 s oxidation, -71 μA cm⁻² for 8 s reduction).

Conclusions:

  • A novel solid-contact ion-selective electrode enabling simultaneous cation and anion detection via electrochemical switching was successfully developed.
  • The electrode exhibits reversible and stable switching between sensing modes.
  • This technology offers a promising platform for advanced electrochemical sensing applications.