Proton transport of porous triazole-grafted polysulfone membranes for high temperature polymer electrolyte membrane fuel cell

Chang Dong, Xin Xu, Jin Zhang*, Haining Wang, Yan Xiang, Haijin Zhu, Maria Forsyth, Shanfu Lu*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

14 Scopus citations

Abstract

Introduction of porous structure to high temperature polymer electrolyte membranes is one of effective pathways to increase their proton conductivity under elevated temperature. However, the effect of the porous structure on the proton diffusion mechanism of these membranes is still unclear. In this work, the proton transport behaviour of a series of porous triazole-polysulfone (PSf) membranes under elevated temperature is comprehensively investigated. The functional triazole ring in the framework of porous triazole-PSf acts a proton acceptor to form acid-base pair with phosphoric acid (PA). In addition, the proton diffusion coefficient and proton conductivity of PA-doped porous triazole-PSf is an order of magnitude higher than that of the PA-doped dense triazole-PSf membrane. Percolation theory calculation convinces that the high proton conductivity of PA-doped porous triazole-PSf is due to the formation of continuous long-range proton diffusion channels under high pore connectivity and porosity. On the contrary, excessive pore connectivity also results in high gas permeability, leading to decrease of the open circuit voltage and cell performance of the single cell. Consequently, the optimum porosity for the PA-doped porous triazole-PSf membrane is 75% for fuel cell operating with the maximum peak power density of 550 mW·cm−2 and great durability for 120 h under 140 °C.

Original languageEnglish
Pages (from-to)8492-8501
Number of pages10
JournalInternational Journal of Hydrogen Energy
Volume47
Issue number13
DOIs
StatePublished - 12 Feb 2022
Externally publishedYes

Keywords

  • HT-PEMFC
  • Percolation theory
  • Porous membrane
  • Proton transport
  • Triazole

Fingerprint

Dive into the research topics of 'Proton transport of porous triazole-grafted polysulfone membranes for high temperature polymer electrolyte membrane fuel cell'. Together they form a unique fingerprint.

Cite this