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Area of Science:

  • Materials Science
  • Chemistry
  • Chemical Engineering

Background:

  • Proton conductivity in solid materials is vital for energy applications.
  • Hydrogen bonding (H-bonding) networks within material pores are key for efficient proton transport.
  • Covalent organic frameworks (COFs) are a promising class of materials for proton conduction.

Purpose of the Study:

  • To synthesize and evaluate chemically stable, carboxylic acid-functionalized 2D microporous COFs for proton conductivity.
  • To investigate the role of carboxylic acid groups and H-bonding in enhancing proton transport.
  • To establish a general strategy for developing high-performance proton-conducting COFs.

Main Methods:

  • Synthesis of a carboxylic acid-functionalized COF (Qy-COOH) via the Doebner multicomponent reaction (MCR).
  • Synthesis of a control COF (Qy-H) lacking -COOH functionality via an MC Domino reaction.
  • Measurement and comparison of proton conductivity for synthesized COFs and an imine-based COF.

Main Results:

  • The Qy-COOH COF exhibited significantly enhanced proton conductivity (10⁻² S cm⁻¹).
  • Strong H-bonding interactions between water and -COOH groups were identified as the cause of enhanced conductivity.
  • The Qy-H COF showed lower conductivity (10⁻⁵ S cm⁻¹), and an imine-based COF showed 10⁻⁶ S cm⁻¹.

Conclusions:

  • A general strategy for achieving efficient proton conduction in 2D -COOH-functionalized COFs was demonstrated.
  • Superprotonic conductivity was achieved at room temperature without additives.
  • The MCR-COF design approach offers a promising pathway for developing stable, high-performance proton-conducting materials.