Sulfonated Triazine-Based Porous Organic Polymers for Excellent Proton Conductivity

Zhongping Li, Zhaohan Liu, He Li, Mdmahmudul Hasan, Athchaya Suwansoontorn, Gang Du, Dongjin Wang, Yuwei Zhang, Yuki Nagao*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

9 Citations (Scopus)

Abstract

Proton-exchange membrane fuel cells (PEMFCs) are a highly promising green and environmentally friendly way to serve the sustainable development of human civilization. However, high-cost synthesis and pollution problems of perfluorinated sulfonic acid membranes are still not resolved. In this research, we designed and constructed porous organic polymers (POPs) with high porosity and excellent stability via the Friedel-Crafts acylation reaction using commercial products as building blocks and low-cost FeCl3 as a catalyst through a simple operation. POP-BP-1 was successfully synthesized using 1,4-bis(chloromethyl)benzene as a cross-linking agent and reactant. POP-BP-TPOT was prepared using 2,4,6-Triphenoxy-1,3,5-Triazine (TPOT) as a building unit into the skeleton of POP-BP-1. Sulfonated POPs (S-POPs) were densely decorated with sulfonic acid groups by postsulfonation. POP-BP-TPOT with abundant triazine units and sulfonic acid groups showed high water uptake. The sulfonated triazine-based polymer showed excellent proton conductivity up to 10-2 S cm-1 at 95% relative humidity (RH) under 25 °C and low activation energy of 0.19 eV. Fuel-cell test was also demonstrated using the polymer. This research suggests that the construction of S-POPs opens a suitable method to design high proton-conducting materials.

Original languageEnglish
Pages (from-to)3267-3273
Number of pages7
JournalACS Applied Polymer Materials
Volume2
Issue number8
DOIs
Publication statusPublished - 2020 Aug 14
Externally publishedYes

Keywords

  • porosity
  • porous organic polymer
  • proton conductivity
  • stability
  • water uptake

ASJC Scopus subject areas

  • Polymers and Plastics
  • Process Chemistry and Technology
  • Organic Chemistry

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