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Related Concept Videos

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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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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Developing Catalysts for Membrane Electrode Assemblies in High Performance Polymer Electrolyte Membrane Water

Sun Seo Jeon1, Wonjae Lee1, Hyeseong Jeon1

  • 1Department of Chemical and Biomolecular Engineering, Korea Advanced Institute of Science and Technology, Daejeon, 34141, Republic of Korea.

Chemsuschem
|July 10, 2024
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Summary

This review focuses on catalysts for membrane-electrode-assembly (MEA) water electrolyzers, essential for green hydrogen production. It highlights advancements in proton and anion exchange membrane water electrolyzers (PEMWE and AEMWE) for efficient, durable hydrogen generation.

Keywords:
CatalystsHydrogen evolution reactionMembrane electrode assemblyOxygen evolution reactionWater electrolyzer

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Area of Science:

  • Electrochemistry and Materials Science
  • Renewable Energy Technologies
  • Green Hydrogen Production

Background:

  • Achieving carbon neutrality necessitates green hydrogen production via water electrolysis powered by renewable energy.
  • Polymer membrane water electrolyzers, including proton exchange membrane water electrolyzers (PEMWE) and anion exchange membrane water electrolyzers (AEMWE), are key technologies.
  • Catalyst development for high activity and durability is critical for commercializing these electrolyzers, but half-cell testing may not reflect real-world membrane-electrode-assembly (MEA) performance.

Purpose of the Study:

  • To review catalysts specifically evaluated for high-performance proton exchange membrane water electrolyzer (PEMWE) and anion exchange membrane water electrolyzer (AEMWE) membrane-electrode-assembly (MEA) systems.
  • To consolidate research findings on catalysts that have demonstrated performance within complete MEA devices, moving beyond half-cell studies.

Main Methods:

  • Literature review focusing exclusively on catalysts reported with membrane-electrode-assembly (MEA) performance data for PEMWE and AEMWE.
  • Analysis of catalyst strategies for the oxygen evolution reaction (OER) in PEMWE, including iridium (Ir) reduction and alternative materials.
  • Examination of catalyst enhancements for the hydrogen evolution reaction (HER) and oxygen evolution reaction (OER) in AEMWE, focusing on nickel-iron (NiFe), cobalt (Co), and platinum (Pt) based systems.

Main Results:

  • For PEMWE, strategies to reduce iridium (Ir) usage in oxygen evolution reaction (OER) catalysts include maximizing activity, using metal oxide supports, doping IrOx lattices, and exploring non-Ir materials.
  • For AEMWE, research focuses on enhancing nickel-iron (NiFe) and cobalt (Co) based catalysts for OER by improving conductivity and mass transport, alongside examining platinum (Pt) and nickel (Ni) based catalysts for HER.
  • Unique challenges and considerations for AEMWE catalysts operating in pure water environments were also discussed.

Conclusions:

  • Catalyst development for MEA-based PEMWE and AEMWE systems is advancing, with a focus on cost reduction (e.g., minimizing Ir) and performance enhancement.
  • Addressing catalyst durability, activity, and operational conditions (like pure water for AEMWE) within MEA configurations is crucial for the commercial viability of green hydrogen production.
  • This review provides a focused overview of MEA-tested catalysts, guiding future research towards practical electrolyzer applications.