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Identifying and Quantifying Loss Sources in Anion-Exchange Membrane Water Electrolyzers.

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Anion-exchange membrane water electrolyzers (AEMWEs) performance losses were quantified using electrochemical impedance spectroscopy and genetic programming. Lowering KOH concentration significantly increases ionic transport resistance, impacting AEMWE efficiency.

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Area of Science:

  • Electrochemistry
  • Materials Science

Background:

  • Anion-exchange membrane water electrolyzers (AEMWEs) offer a sustainable alternative using precious-metal-free catalysts and fluorine-free membranes.
  • Understanding performance limitations is crucial for commercializing AEMWE technology.

Purpose of the Study:

  • To identify and quantify performance loss sources in AEMWEs under various operating conditions.
  • To develop an analytical model for analyzing electrochemical processes using Distribution Function of Relaxation Times (DFRT).

Main Methods:

  • Utilized electrochemical impedance spectroscopy (EIS) combined with MATLAB-based genetic programming.
  • Developed an analytical DFRT model to differentiate Faradaic and non-Faradaic processes.
  • Investigated effects of KOH concentration, dry cathode operation with different anode electrolytes, temperature, and membrane type.

Main Results:

  • Decreased KOH concentration in the anode significantly increases ionic transport resistance, reducing performance.
  • Dry cathode operation with KOH anode provides performance comparable to dual-electrolyte systems due to effective water back-diffusion.
  • Using pure water as anode electrolyte with a dry cathode drastically increases resistance and hinders ionic transport.

Conclusions:

  • DFRT analysis effectively separates and quantifies electrochemical phenomena in AEMWEs, simplifying system design.
  • Optimizing anode electrolyte and ionomeric materials is critical for improving AEMWE efficiency and enabling commercialization.
  • This approach advances the development of efficient AEMWEs for clean hydrogen production.