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Area of Science:

  • Materials Science
  • Electrochemistry
  • Chemical Engineering

Background:

  • Crystalline porous materials offer potential for high hydroxide conductivity in alkaline fuel cells.
  • Challenges include processing rigid porous materials into membranes and conductivity losses in composite membranes.

Purpose of the Study:

  • To develop a self-standing, processable membrane for efficient hydroxide transport using a 3D covalent organic framework (3D COF).
  • To overcome limitations of existing porous and composite membranes for alkaline fuel cell applications.

Main Methods:

  • Interface polymerization strategy assisted by sacrificial templates (polyacrylonitrile membrane) to create large-area 3D COF membranes.
  • Incorporation of imidazolium salt-building units to form noninterpenetrated structures with continuous hydrophilic channels.

Main Results:

  • A large-area (8 cm diameter, 20 μm thickness), self-standing 3D COF membrane was successfully fabricated.
  • The membrane exhibited efficient OH- transport through interconnected 3D ionic nanochannels.
  • High ionic conductivity (169 mS/cm at 80 °C, 100% humidity) and a peak power density of 160 mW/cm² in H₂/O₂ fuel cells were achieved.

Conclusions:

  • The developed 3D COF membrane provides a promising solution for efficient hydroxide conduction in alkaline fuel cells.
  • The interface polymerization strategy enables the formation of membranes from porous materials, overcoming processing challenges.
  • This advancement is expected to accelerate the practical application of COFs in ion transport technologies.