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Reply to 'Comment on "Understanding the infrared spectrum of the protic ionic liquid [DEMA][TfO] by atomistic simulations"' by J. Joo and A. L. L. East, <i>Phys. Chem. Chem. Phys.</i>, 2026, <b>28</b>, DOI: 10.1039/D5CP02379C.

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Constructing a Multifunctional Interface between Membrane and Porous Transport Layer for Water Electrolyzers.

Chang Liu1,2, Klaus Wippermann1, Marcin Rasinski3

  • 1Institute of Energy and Climate Research, IEK-14: Electrochemical Process Engineering, Forschungszentrum Jülich GmbH, 52425 Jülich, Germany.

ACS Applied Materials & Interfaces
|April 2, 2021
PubMed
Summary

Reducing iridium loading on porous transport layers (PTLs) in polymer electrolyte membrane (PEM) water electrolyzers significantly cuts costs. A loading of 0.025 mg·cm-2 iridium on PTLs maintains cell performance while lowering precious metal expenses.

Keywords:
PEM water electrolyzersiridiumporous transport electrodeporous transport layersputtering

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Area of Science:

  • Electrochemistry
  • Materials Science
  • Renewable Energy

Background:

  • Polymer electrolyte membrane (PEM) water electrolyzers face performance and durability limitations due to titanium-based porous transport layer (PTL) passivation.
  • High costs of noble metal coatings (gold, platinum, iridium) on PTLs hinder commercialization.

Purpose of the Study:

  • To assess the impact of varying iridium loadings on titanium PTLs for PEM water electrolyzers.
  • To determine an optimal iridium loading that balances cost reduction and performance maintenance.

Main Methods:

  • Investigated different iridium loadings on titanium PTLs, ranging from 0.005 to 0.05 mg·cm-2.
  • Evaluated cell performance and durability with varying iridium coatings.
  • Analyzed the effect of iridium loading on Ohmic resistance and oxygen evolution reaction activity.

Main Results:

  • An iridium loading of 0.025 mg·cm-2 achieved equivalent cell performance to higher loadings.
  • This loading represents a 40-fold reduction compared to typical gold or platinum usage.
  • Iridium coating significantly decreased Ohmic resistance and demonstrated oxygen evolution reaction catalytic activity.

Conclusions:

  • Optimized iridium loading on PTLs offers a cost-effective solution for PEM water electrolyzers.
  • A multifunctional interface between the membrane and PTL is crucial for high performance and efficiency.