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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 basic...
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Polymeric Hydrogel Interphase Enables Transport-Compatible Fe Stabilization for Hectowatt-Scale Alkaline Water

Wenyu Song1,2, Yuefei Zhang3, Yang Wang1,2

  • 1Engineering Research Center of Energy Storage Materials and Devices, Ministry of Education, School of Chemistry, Xi'an Jiaotong University, Xi'an 710049, China.

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An ultrathin hydrogel layer on NiFe LDH enhances durability for alkaline water electrolysis (AWE) by stabilizing iron sites and improving ion transport, enabling long-term, efficient hydrogen production.

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Area of Science:

  • Materials Science
  • Electrochemistry
  • Chemical Engineering

Background:

  • Durable oxygen evolution reaction (OER) in industrial alkaline water electrolysis (AWE) is challenging due to iron dissolution in NiFe layered double hydroxides (LDH).
  • Sluggish ion transport and bubble release at the gas-liquid-solid interface further impede OER performance.

Purpose of the Study:

  • To design a novel interphase for stabilizing Fe sites and enhancing interfacial transport in NiFe LDH for improved OER durability.
  • To investigate the mechanism of Fe stabilization and multiphase transport facilitated by the interphase in AWE.

Main Methods:

  • Coating NiFe LDH with an ultrathin sodium polyacrylate (PANa) hydrogel layer.
  • Characterization of the PANa interphase's effect on Fe site stability and interfacial transport.
  • Testing the performance of the modified anode in a hectowatt-scale AWE system.

Main Results:

  • The PANa interphase enabled a self-regulated Fe dissolution-redeposition process, stabilizing active sites.
  • Enhanced hydroxyl ion (OH-) transport and rapid oxygen gas (O2) disengagement were observed.
  • The PANa/NiFe LDH anode demonstrated stable operation for over 2500 h at 0.5 A cm-2 in a 600 W AWE system.

Conclusions:

  • The PANa hydrogel interphase effectively boosts OER durability and efficiency in industrial AWE.
  • This approach offers a promising strategy for cost-effective hydrogen production with low energy consumption (4.25 kWh Nm-3 H2).
  • The projected hydrogen production cost is competitive at US$ 2.38 kgH2-1.