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Local ionic transport enables selective PGM-free bipolar membrane electrode assembly.

Mengran Li1,2, Eric W Lees3,4, Wen Ju5,6

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Managing ion crossover in bipolar membranes is key for efficient electrochemical CO2 conversion. This study enhances CO2 utilization and stability by optimizing ion transport, enabling platinum-group-metal-free systems.

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Area of Science:

  • Electrochemistry
  • Materials Science
  • Chemical Engineering

Background:

  • Bipolar membranes (BPMs) in electrochemical CO2 conversion cells create distinct reaction environments.
  • Ideal conditions allow for platinum-group-metal-free (PGM-free) anodes and high CO2 utilization.
  • Unwanted ion crossover in BPMs currently limits operational stability.

Purpose of the Study:

  • To investigate the role of managing ionic species in improving CO2 conversion efficiency.
  • To prevent acidification of the anodic compartment during CO2 conversion.
  • To enhance the stability and performance of PGM-free BPM electrode assemblies.

Main Methods:

  • Transport modeling to identify optimal ion management strategies.
  • Incorporation of an anion-exchange ionomer in the catalyst layer.
  • Experimental validation of improved ion transport and CO2 conversion.

Main Results:

  • Anion-exchange ionomers improve local bicarbonate availability for CO2 reduction.
  • Increased proton transference number in BPMs enhances CO2 regeneration and limits cation accumulation.
  • Uniform bicarbonate distribution improves CO2 accessibility to the catalyst, boosting Faradaic efficiency.

Conclusions:

  • Effective management of ionic species is crucial for stable and efficient electrochemical CO2 conversion.
  • The developed PGM-free BPM system demonstrates high CO2 utilization and stability.
  • This work paves the way for robust PGM-free CO2 conversion technologies.