Molecular-Level Energy Dissipation and Micropore Engineering Synergistically Enhance Anion Exchange Membrane...

Area of Science:

• Materials Science
• Polymer Chemistry
• Electrochemistry

Background:

• Anion exchange membranes (AEMs) face a critical trade-off between ionic conductivity and mechanical robustness.
• Developing AEMs with improved performance is crucial for efficient energy conversion technologies.

Purpose of the Study:

• To design a novel tetra-functional building block for AEMs.
• To simultaneously enhance ionic conductivity and mechanical integrity in AEMs.
• To evaluate the performance of AEMs in anion exchange membrane water electrolyzers (AEMWEs).

Main Methods:

• Synthesized a helical tetra-functional building block from tetraphenyl-ethylene (TPE).
• Constructed interconnected ion-transport channels and mechanically reinforced polymer networks.
• Fabricated and tested AEMs in AEMWEs under demanding conditions.

Main Results:

• Achieved a 22.6% enhancement in H2O/OH- species diffusion via microporous pathways.
• Demonstrated a 79% increase in transverse tensile strength and 43% improvement in longitudinal hardness.
• Configured AEMWEs (QTPE-x) showing enhanced current density and operational stability.

Conclusions:

• The molecular design strategy successfully decoupled ionic conductivity and mechanical integrity.
• Developed a general framework for high-performance AEMs in sustainable energy conversion.
• The novel TPE-derived building block offers a promising approach for next-generation AEMs.