Phosphoric acid loaded azo (-N═N-) based covalent organic framework for proton conduction
Suman Chandra1, Tanay Kundu, Sharath Kandambeth
1Physical/Materials Chemistry Division, CSIR-National Chemical Laboratory, Dr. Homi Bhabha Road, Pune 411008, India.
Journal of the American Chemical Society
|April 25, 2014
Summary
Chemically stable covalent organic frameworks (COFs) were synthesized and demonstrated high stability. These novel materials show promise as proton conducting materials, a first for COFs.
Area of Science:
- Materials Science
- Chemistry
- Nanotechnology
Background:
- Covalent organic frameworks (COFs) are crystalline porous polymers with tunable properties.
- Developing stable COFs for energy applications is an ongoing research area.
Purpose of the Study:
- To synthesize novel, chemically stable functional COFs.
- To investigate the proton conductivity of these COFs, particularly after doping.
Main Methods:
- Schiff base reaction between triformylphloroglucinol (Tp) and either 4,4'-azodianiline (Azo) or 4,4'-diaminostilbene (Stb).
- Characterization of the synthesized COFs (Tp-Azo and Tp-Stb).
- Doping Tp-Azo with H3PO4 to assess proton conductivity.
Main Results:
- Two new COFs, Tp-Azo and Tp-Stb, were successfully synthesized.
- Both COFs exhibited high chemical stability in water, acidic, and basic conditions.
- H3PO4-doped Tp-Azo demonstrated significant proton conductivity in both hydrous and anhydrous states.
Conclusions:
- The synthesized COFs possess excellent chemical stability.
- This work presents the first report of COFs functioning as proton conducting materials.
- The findings open new avenues for COFs in electrochemical energy applications.
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