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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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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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Electrolysis

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In a galvanic cell, the electrical work is done by a redox system on its surroundings as electrons produced by the spontaneous redox reactions are transferred through an external circuit. Alternatively, an external circuit does work on a redox system by imposing a voltage sufficient to drive an otherwise nonspontaneous reaction in a process known as electrolysis. For instance, recharging a battery involves the use of an external power source to drive the spontaneous (discharge) cell reaction in...
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Ion-Exchange Chromatography01:09

Ion-Exchange Chromatography

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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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Electrodeposition01:08

Electrodeposition

1.2K
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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Anion Exchange Membrane Water Electrolysis Using a Catalyst-Coated Membrane Cathode.

Habin Park1, Shane Harris1, Paul A Kohl1

  • 1Georgia Institute of Technology, School of Chemical and Biomolecular Engineering, Atlanta, Georgia 30332-0100, United States.

ACS Electrochemistry
|November 12, 2025
PubMed
Summary
This summary is machine-generated.

The catalyst-coated membrane (CCM) approach improves water electrolysis by enhancing catalyst contact and transport. This method boosts efficiency and durability for anion exchange membrane (AEM) electrolyzers.

Keywords:
Water electrolysisanion-exchange membranecatalyst-coated membranecross-linkingdurability

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Area of Science:

  • Electrochemistry
  • Materials Science

Background:

  • Anion exchange membrane (AEM) water electrolysis is crucial for sustainable hydrogen production.
  • Effective electrode fabrication is key to optimizing AEM electrolyzer performance.
  • The catalyst-coated membrane (CCM) configuration offers potential advantages over catalyst-coated substrate (CCS) for AEM electrolysis.

Purpose of the Study:

  • To directly compare the performance of CCM and CCS cathode configurations for AEM water electrolysis.
  • To analyze the polarization behavior and degradation mechanisms of CCM cathodes.
  • To optimize CCM cathode design for improved efficiency and durability.

Main Methods:

  • Fabrication of CCM and CCS electrodes with identical hydrogen evolution reaction (HER) catalysts.
  • Integration of a pseudo-reference electrode for detailed cathode polarization analysis.
  • Surface characterization to investigate degradation mechanisms.
  • Optimization of cathode ionomer cross-link density and HER catalyst loading.

Main Results:

  • CCM configuration demonstrated enhanced interfacial contact and improved ionic/water transport compared to CCS.
  • Optimization of ionomer cross-link density and catalyst loading significantly improved cathode performance and device durability.
  • Detailed analysis revealed degradation insights specific to the CCM configuration.

Conclusions:

  • The CCM approach is superior to CCS for AEM water electrolysis due to better interfacial contact and transport.
  • Optimized CCM design, including ionomer cross-link density and catalyst loading, leads to higher efficiency and durability.
  • Findings provide critical guidance for developing advanced CCMs for high-performance AEM electrolyzers.