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Related Concept Videos

Potentiometry: Membrane Electrodes01:15

Potentiometry: Membrane Electrodes

484
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...
484
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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Electrodeposition01:08

Electrodeposition

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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.
Electrodeposition can...
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Standard Electrode Potentials03:02

Standard Electrode Potentials

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On comparing the reactivity of silver and lead, it is observed that the two ionic species, Ag+ (aq) and Pb2+ (aq), show a difference in their redox reactivity towards copper: the silver ion undergoes spontaneous reduction, while the lead ion does not. This relative redox activity can be easily quantified in electrochemical cells by a property called cell potential. This property is commonly known as cell voltage in electrochemistry, and it is a measure of the energy which accompanies the charge...
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Advanced Nickel-Based Gas Diffusion Anode for Zero-Gap Anion-Exchange Membrane Water Electrolyzers.

Irina V Pushkareva1, Zhixing Wu2, Xianjie Liu2

  • 1HySA Infrastructure Center of Competence, Faculty of Engineering, North-West University, Private Bag X6001, Potchefstroom Campus, 2531 Potchefstroom, South Africa.

ACS Applied Materials & Interfaces
|May 23, 2025
PubMed
Summary

This study enhances anion-exchange membrane water electrolyzers (AEMWE) for green hydrogen production by improving the anode catalyst layer. Optimized AEMWEs achieve high performance, reducing costs and advancing carbon-neutral energy goals.

Keywords:
anion-exchange membraneelectrochemical impedance spectroscopymembrane electrode assemblymesoporous nickel(II) oxidemicroporous layernickel foamwater electrolysis

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Area of Science:

  • Electrochemistry
  • Materials Science
  • Sustainable Energy

Background:

  • Anion-exchange membrane water electrolyzers (AEMWE) are crucial for sustainable green hydrogen production.
  • Reducing electrical losses and costs in AEMWEs is essential for widespread adoption.
  • Current AEMWE designs face challenges with anode catalyst utilization and membrane integrity.

Purpose of the Study:

  • To reduce electrical losses in AEMWEs by designing an improved anode catalyst layer.
  • To enhance the performance and cost-effectiveness of green hydrogen technology.
  • To investigate a novel anode modification for improved oxygen evolution reaction (OER) efficiency.

Main Methods:

  • Modified nickel foam using a microporous nickel ink to create a smoother anode surface.
  • Utilized mesoporous NiO (mesoNiO) catalyst integrated with a nickel powder layer for enhanced OER.
  • Optimized catalyst mass loading for balanced membrane contact, reduced kinetic losses, and efficient ionic transport.

Main Results:

  • Achieved a competitive current density of 2.6 A cm-2 at 2 V cell voltage.
  • Demonstrated comparable performance to state-of-the-art proton-exchange membrane water electrolyzers.
  • Successfully prevented membrane punctures during assembly through anode surface smoothing.

Conclusions:

  • The developed anode catalyst layer significantly reduces electrical losses in AEMWEs.
  • Fluorocarbon membrane-free, zero-gap AEMWEs with platinum-free anodes show great potential for green hydrogen.
  • This advancement paves the way for further research into catalyst-free water electrolyzers for future sustainable hydrogen production.