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Related Concept Videos

Ion Exchange01:17

Ion Exchange

669
Ion exchange chromatography separates charged molecules from a solution by reversibly exchanging them with mobile, or 'active', ions associated with the oppositely charged stationary phase. This method can be used to separate ions, soften and deionize water, and purify solutions. The polymers comprising the ion-exchange column are high-molecular-weight and chemically stable polymers, crosslinked to be porous and essentially insoluble. They are also functionalized with either acidic or...
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Potentiometry: Membrane Electrodes01:15

Potentiometry: Membrane Electrodes

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Membrane electrodes, also known as p-ion electrodes, use membranes that selectively interact with free analyte ions, generating a potential difference across the membrane. The resulting membrane potential, known as the asymmetry potential, is not zero even when analyte concentrations on both sides of the membrane are equal. The membrane's response is typically not selective to a single analyte but proportional to the concentration of all ions in the sample solution capable of interacting at...
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New triazinephosphonate dopants for Nafion proton exchange membranes (PEM).

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New Modified SPEEK-Based Proton Exchange Membranes.

Fátima C Teixeira1, António P S Teixeira2, Carmen M Rangel1

  • 1Laboratório Nacional de Energia e Geologia, I.P., Estrada do Paço do Lumiar, 22, 1649-038 Lisboa, Portugal.

Polymers
|June 27, 2025
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Summary
This summary is machine-generated.

Researchers developed improved ion-exchange membranes for clean energy technologies by adding bisphosphonic acid (BP) dopants to sulfonated poly(etheretherketone) (SPEEK). The best membrane achieved high proton conductivity, offering a low-cost alternative to Nafion.

Keywords:
SPEEK modified membraneselectrolyzerfuel cellsproton exchange membranes

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Area of Science:

  • Materials science for sustainable energy solutions.
  • Electrochemistry and polymer science.

Background:

  • Decarbonization requires advanced energy storage and conversion technologies like fuel cells and electrolyzers.
  • Ion-exchange membranes are critical components, but commercial options like Nafion have limitations.
  • Sulfonated poly(etheretherketone) (SPEEK) is a promising alternative polymer for membranes.

Purpose of the Study:

  • To enhance the properties of SPEEK-based membranes through the incorporation of bisphosphonic acid (BP) dopants.
  • To develop low-cost, high-performance ion-exchange membranes for electrochemical devices.
  • To investigate the impact of BP doping on membrane structure, thermal stability, and proton conductivity.

Main Methods:

  • Preparation of SPEEK membranes doped with bisphosphonic acid (BP).
  • Structural, thermal, and morphological characterization using AT-FTIR, TGA, and SEM.
  • Proton conductivity measurement via Electrochemical Impedance Spectroscopy (EIS) from 30 °C to 60 °C.
  • Assessment of membrane stability during conductivity testing.

Main Results:

  • Successful incorporation of BP dopants into SPEEK polymer matrices.
  • Characterization confirmed structural, thermal, and morphological integrity of the new membranes.
  • The SPEEK membrane doped with 2.0 wt% BP1 exhibited the highest proton conductivity (226 mS cm⁻¹) at 60 °C.
  • Membranes demonstrated good stability over the tested temperature range.

Conclusions:

  • Bisphosphonic acid doping is an effective strategy to improve SPEEK-based ion-exchange membranes.
  • The developed membranes offer a promising low-cost alternative with enhanced proton conductivity for clean energy applications.
  • Further research can optimize doping levels and explore other dopants for even better performance.