Journal
ACS SUSTAINABLE CHEMISTRY & ENGINEERING
Volume 8, Issue 6, Pages 2423-2432Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acssuschemeng.9b06234
Keywords
porous organic polymer; microporosity; Bronsted acidity; proton conductivity; sulfonic acid groups
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Funding
- Department of Science and Technology-Science and Engineering Research Board (DST-SERB), New Delhi [CRC/2018/000230]
- Japan Society for the Promotion of Science (JSPS)
- DST
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Designing high-performing proton-conducting materials with in-built -SO3H moieties in the crystalline organic framework is very challenging in the context of developing an efficient solid electrolyte for fuel cells. Herein, we report a simple chemical route for synthesizing crystalline microporous sulfonic acid-functionalized porous organic polymers (MPOPS-1) via extended condensation polymerization between two organic monomers (i.e., cyanuric chloride and 2,5-diaminosulfonic acid) under refluxing conditions. The crystal structure of this organic framework has been indexed from powder X-ray diffraction data, revealing a monoclinic phase with a unit cell volume of 1627 angstrom(3). The presence of in-built sulfonic acid groups in MPOPS-1 contributes significantly to the high proton conductivity of this porous organic polymer. The resulting MPOPS-1 displays proton conductivities of 1.49 X 10(-5) and 3.07 X 10(-2) S cm(-1) at 350 K temperature under anhydrous and humid conditions, respectively, outperforming many previously reported porous organic polymers.
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