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Ion Exchange01:17

Ion Exchange

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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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Dialysis is a diffusion-based purification process that separates analyte molecules from a complex matrix. This is accomplished by allowing molecules in the solution to pass through a semipermeable membrane into a liquid on the other side. The membrane is usually made of cellulose acetate or cellulose nitrate, and the second liquid must be miscible with the solution. Ions (e.g., chloride or sodium) or organic molecules (e.g., glucose) can pass through the membrane pores, which generally have...
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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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Detergents are used to purify the integral proteins of the membrane. The hydrophobic portion of the detergent can replace membrane phospholipids while solubilizing the membrane proteins. When detergent monomers reach a specific concentration in a solution called critical micelle concentration (CMC), they form micelles. Above CMC, the concentration of the detergent monomers remains in equilibrium with the micelle. The number of detergent monomers present in the CMC varies for each detergent, and...
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Ion-Exchange Membranes for the Fabrication of Reverse Electrodialysis Device
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Durable, pure water-fed, anion-exchange membrane electrolyzers through interphase engineering.

Shujin Hou1,2, Archana Sekar3, Yang Zhao1,2

  • 1Department of Chemical and Biomolecular Engineering and Department of Chemistry, University of California, Berkeley, Berkeley, CA, USA.

Science (New York, N.Y.)
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Anion-exchange membrane water electrolyzers (AEMWEs) show improved durability for hydrogen production. Interphase engineering with inorganic additives stabilizes anode ionomers, significantly enhancing AEMWE performance and longevity.

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Area of Science:

  • Electrochemistry
  • Materials Science
  • Sustainable Energy

Background:

  • Anion-exchange membrane water electrolyzers (AEMWEs) offer a promising route to scalable and cost-effective hydrogen production.
  • A key limitation hindering AEMWEs is the electrochemical instability of anode ionomers, impacting operational durability.
  • Current AEMWEs often require supporting electrolytes, adding complexity and cost.

Purpose of the Study:

  • To enhance the durability of anion-exchange membrane water electrolyzers (AEMWEs) by addressing anode ionomer instability.
  • To develop a method for stabilizing AEMWEs for operation in pure water, eliminating the need for supporting electrolytes.
  • To investigate the mechanism of stabilization through interphase engineering using inorganic additives.

Main Methods:

  • Interphase engineering using inorganic-containing molecular additives that coassemble with anode ionomers.
  • Fabrication and testing of pure water-fed AEMWEs incorporating the engineered interphase.
  • Electrochemical characterization, including durability testing at 2.0 amperes per square centimeter and 70°C.
  • Analysis of additive-ionomer interactions and the formation of a protective interphase using various analytical techniques.

Main Results:

  • Achieved a degradation rate of less than 0.5 millivolt per hour at 2.0 amperes per square centimeter and 70°C, representing a >20-fold durability improvement.
  • Demonstrated stable operation of AEMWEs in pure water without supporting electrolytes.
  • Identified that the stabilization mechanism involves cross-linking between metal oxo/hydroxo oligomers and ionomers, forming a protective interphase.
  • Observed enrichment of the inorganic additive at the catalyst interface, passivating the anode ionomer against degradation while preserving mechanical integrity and conductivity.

Conclusions:

  • Additive-based interphase engineering significantly enhances the durability of AEMWEs.
  • This strategy enables AEMWEs to operate efficiently and stably in pure water, reducing operational costs and complexity.
  • The developed approach is adaptable across diverse catalysts and ionomers, offering a versatile pathway for advancing electrochemical technologies.