4.6 Article

Superprotonic conduction of intrinsically zwitterionic microporous polymers based on easy-to-make squaraine, croconaine and rhodizaine dyes

Journal

NANOSCALE ADVANCES
Volume 4, Issue 13, Pages 2922-2928

Publisher

ROYAL SOC CHEMISTRY
DOI: 10.1039/d2na00177b

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Funding

  1. National Natural Science Foundation of China [21871061]
  2. Science and Technology Planning Project of Guangdong Province [2021A0505030066]
  3. EPSRC [EP/L016419/1]
  4. Research Grants Council of HKSAR [CityU 11303519]

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Porous organic polymers (POPs) were prepared via a metal-free polycondensation reaction between a specific monomer and acidic substances. The study found that doping the materials can significantly improve the proton conductivity of porous organic polymers.
Porous organic polymers (POPs) have been prepared via a novel metal free polycondensation between a tritopic indole-based monomer and squaric, croconic and rhodizonic acids. Each of the three POPs exhibited high BET surface areas (331-667 m(2) g(-1)) and zwitterionic structures. Impedance measurements revealed that the intrinsic POPs were relatively weak proton conductors, with a positive correlation between the density of oxo-groups and the proton conduction. Doping the materials with LiCl vastly improved the proton conductivity up to a value of 0.54 S cm(-1) at 90 degrees C and 90% relative humidity.

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