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Related Concept Videos

Ion Exchange01:17

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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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Ion-exchange chromatography, or IEC, is a technique for separating ions based on their affinity for the stationary phase. The stationary phase is a cross-linked polymer resin with covalently attached ionic functional groups. The functional groups can be either positively charged (cation exchangers) or negatively charged (anion exchangers). A cation exchanger consists of a polymeric anion and active cations, while an anion exchanger is a polymeric cation with active anions. The choice of...
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Electrodeposition is a technique used to separate an analyte from interferents by electrochemical processes. Here, the analyte is a metal ion that can be deposited on an electrode immersed in the sample solution. The electrochemical setup consists of an anode and a cathode. When an electric current is applied to the setup, oxidation occurs at the anode. At the cathode, which consists of a large metal surface, metal ions undergo reduction and deposit onto the surface.
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Ion-Exchange Membranes for the Fabrication of Reverse Electrodialysis Device
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Anionic Exchange Membrane for Photo-Electrolysis Application.

Carmelo Lo Vecchio1, Alessandra Carbone1, Stefano Trocino1

  • 1Institute for Advanced Energy Technologies "Nicola Giordano"-CNR-ITAE, Via Salita S. Lucia sopra Contesse 5, 98126 Messina, Italy.

Polymers
|December 18, 2020
PubMed
Summary
This summary is machine-generated.

This study developed advanced anion-exchange membranes for efficient solar fuel generation through water-splitting in tandem photo-electrochemical cells. The optimized membranes exhibit high conductivity and transparency, crucial for maximizing solar energy conversion.

Keywords:
anion-exchange membraneionic conductivityionomerphoto-electro-chemical applicationstandem cell

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Area of Science:

  • Materials Science
  • Electrochemistry
  • Renewable Energy

Background:

  • Tandem photo-electrochemical (PEC) cells offer a promising route for green solar fuel production via water-splitting.
  • Developing efficient and stable solid electrolyte membranes is critical for optimizing PEC cell performance.

Purpose of the Study:

  • To investigate and optimize anion-exchange polymer-electrolyte membranes for use in tandem PEC cells.
  • To evaluate membrane properties including ionic conductivity, corrosion resistance, and light transmission.
  • To assess the performance of low-cost tandem PEC cells utilizing these membranes.

Main Methods:

  • Anion-exchange membranes based on polysulfone with quaternary ammonium functionalities were synthesized.
  • Membranes were characterized for ion-exchange capacity (IEC) and hydroxide conductivity in alkaline solutions.
  • Optical transparency and hydrogen crossover were measured.
  • Tandem PEC cells were assembled using optimized membranes and low-cost photoelectrodes (hematite and cupric oxide).

Main Results:

  • Optimized membranes achieved an IEC of 1.59 meq/g and hydroxide conductivity of 25 mS/cm at 60 °C.
  • The membranes demonstrated transparency above 600 nm and minimal hydrogen crossover (<0.1%).
  • Maximum solar-to-fuel efficiencies (enthalpy, throughput, Gibbs energy) were achieved with specific ionomer loading and solvent systems.

Conclusions:

  • The developed anion-exchange membranes are suitable for tandem PEC water-splitting applications due to their high conductivity, transparency, and low H2 permeability.
  • Optimized ionomer dispersion and loading are key factors for maximizing the efficiency of low-cost tandem PEC cells.
  • This research contributes to the advancement of sustainable solar fuel production technologies.