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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 Chromatography01:09

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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

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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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Standard Electrode Potentials03:02

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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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Extraction: Advanced Methods00:56

Extraction: Advanced Methods

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Metal ions can be separated from one another by complexation with organic ligands–the chelating agent– to form uncharged chelates. Here, the chelating agent must contain hydrophobic groups and behave as a weak acid, losing a proton to bind with the metal. Since most organic ligands used in this process are insoluble or undergo oxidation in the aqueous phase, the chelating agent is initially added to the organic phase and extracted into the aqueous phase. The metal-ligand complex is...
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Solar-Driven Electrochemical Green Fuel Production from CO2 and Water Using Ti3C2Tx MXene-Supported CuZn and NiCo Catalysts
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Interface Engineering Effected Charge Redistribution within High Entropy Alloy-Metal Heterostructured Catalyst

Chiung-Wen Chang1, Yu-Chieh Ting1, Kai-An Lee1

  • 1Department of Chemical Engineering, National Tsing Hua University, Hsinchu, 300044, Taiwan.

Small (Weinheim an Der Bergstrasse, Germany)
|November 26, 2025
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Summary

A novel high entropy alloy-metal heterostructure catalyst (HEA-Mo) was developed for anion exchange membrane water electrolysis (AEMWE). This catalyst significantly enhances green hydrogen production efficiency and stability.

Keywords:
anion exchange membrane water electrolysisbifunctional catalystheterostructured catalysthigh entropy alloynon‐precious metal based catalyst

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Area of Science:

  • Materials Science
  • Electrochemistry
  • Catalysis

Background:

  • Development of cost-effective, efficient, and stable catalysts is crucial for advancing anion exchange membrane water electrolysis (AEMWE) for green hydrogen production.
  • High entropy alloy-metal heterostructures (HEA-Mo) offer promising bifunctional catalytic properties due to synergistic effects and interfacial electronic interactions.

Purpose of the Study:

  • To synthesize and evaluate a novel FeCoNiCuMo HEA-Mo heterostructured catalyst for both anode and cathode in AEMWE.
  • To investigate the catalyst's performance in hydrogen evolution reaction (HER) and oxygen evolution reaction (OER) and its stability for green hydrogen production.

Main Methods:

  • Synthesis of FeCoNiCuMo HEA-Mo heterostructure via supersaturation-induced phase separation.
  • Electrochemical characterization of HER and OER activities in 1 M KOH.
  • Performance testing of the HEA-Mo//HEA-Mo based AEMWE system at high current densities.

Main Results:

  • The catalyst demonstrated outstanding HER (η10/η500 of 24/140 mV) and OER (η10/η500 of 175/325 mV) activities.
  • The AEMWE system achieved an ultrahigh current density of 2207 mA cm⁻² at 2.0 V.
  • Stable operation at 500 mA cm⁻² for 100 hours with only 3.1% decay was observed, indicating excellent stability.

Conclusions:

  • The FeCoNiCuMo HEA-Mo catalyst exhibits superior bifunctional activity and stability for AEMWE.
  • The enhanced HER activity is attributed to modulated charge distributions and improved water dissociation.
  • This catalyst represents a significant advancement for efficient and cost-effective green hydrogen production via AEMWE.