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Stabilizing Pure Water-Fed Anion Exchange Membrane Water Electrolyzers through Membrane-Electrode Interface

Sinwoo Kang1,2,3, Yeongin Kim1,2,3, Vincent Wilke4

  • 1School of Earth Sciences and Environmental Engineering, Gwangju Institute of Science and Technology (GIST), Gwangju 61005, Republic of Korea.

ACS Applied Materials & Interfaces
|August 27, 2024
PubMed
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Anion exchange ionomer coatings enhance nickel-iron (oxy)hydroxide (NiFeOH) electrocatalyst durability for oxygen evolution reactions. This modification improves stability in pure water-fed electrolyzers by controlling local pH and reducing metal dissolution.

Keywords:
in situ Raman spectroscopynickel−iron (oxy)hydroxideoxygen evolution reactionpure water-fed anion exchange membrane water electrolysissegmented cellstability

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Area of Science:

  • Electrochemistry
  • Materials Science
  • Catalysis

Background:

  • Nickel-iron (oxy)hydroxide (NiFeOH) is a promising nonprecious electrocatalyst for the oxygen evolution reaction (OER).
  • Anode material instability in pure water-fed electrolyzers limits the durability of NiFeOH catalysts due to nickel and iron dissolution.

Purpose of the Study:

  • To enhance the stability and durability of NiFeOH electrocatalysts in pure water-fed electrolyzers.
  • To investigate the effect of an anion exchange ionomer coating on the local pH environment and catalyst degradation.

Main Methods:

  • Application of an anion exchange ionomer coating to NiFeOH electrocatalysts.
  • Stability testing of coated and uncoated catalysts.
  • Locally resolved current density measurements.
  • In situ Raman spectroscopy in neutral pH electrolyte.

Main Results:

  • The ionomer coating created an alkaline local pH environment by extending hydroxide anion diffusion, reducing Ni dissolution.
  • Coated NiFeOH catalysts exhibited a 6-fold increase in stability during testing, with significantly lower degradation rates.
  • In situ Raman spectroscopy confirmed inhibited Ni oxidation and dissolution with the ionomer coating.

Conclusions:

  • Anion exchange ionomer coatings effectively mitigate Ni dissolution and improve the durability of NiFeOH electrocatalysts in pure water-fed electrolyzers.
  • This strategy offers a pathway to enhance the long-term performance of nonprecious OER catalysts in demanding electrochemical applications.