首页|High-performance imidazole-containing polymers for applications in high temperature polymer electrolyte membrane fuel cells
High-performance imidazole-containing polymers for applications in high temperature polymer electrolyte membrane fuel cells
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This work focuses on the development of high temperature polymer electrolyte membranes(HT-PEMs)as key materials for HT-PEM fuel cells(HT-PEMFCs).Recognizing the challenges associated with the phosphoric acid(PA)doped polybenzimidazole(PBI)membranes,including the use of carcinogenic monomers and complex synthesis procedures,this study aims to develop more cost-effective,readily synthesized,and high-performance alternatives.A series of superacid-catalyzed polyhydroxyalkylation reactions have been carefully designed between p-terphenyl and aldehydes bearing imidazole moieties,resulting in a new class of HT-PEMs.It is found that the chemical structure of aldehyde-substituted N-heterocycles significantly impacts the polymerization reaction.Specifically,the use of 1-methyl-2-imidazole-formaldehyde and 1 H-imidazole-4-formaldehyde monomers leads to the formation of high-viscosity,rigid,and ether-free polymers,denoted as PTIm-a and PTIm-b.Membranes fabricated from these polymers,due to their pendent imidazole groups,exhibit an exceptional capacity for PA absorption.Notably,PTIm-a,carrying methylimidazole moieties,demonstrates a superior chemical stability by maintaining morphology and structural stability during 350 h of Fenton testing.After being immersed in 75 wt％PA at 40 ℃,the PTlm-a membrane reaches a PA content of 152％,maintains a good tensile strength of 13.6 MPa,and exhibits a moderate conductivity of 50.2 mS cm-1 at 180 ℃.Under H2/O2 operational conditions,a single cell based on the PTIm-a membrane attains a peak power density of 732 mW cm-2 at 180 ℃ without backpressure.Furthermore,the membrane demonstrates stable cycle stability over 173 h within 18 days at a current density of 200 mA cm-2,indicating its potential for prac-tical application in HT-PEMFCs.This work highlights innovative strategies for the synthesis of advanced HT-PEMs,offering significant improvements in membrane properties and fuel cell performance,thus expanding the horizons of HT-PEMFC technology.
High temperature polymer electrolyte membraneImidazole-containing polymerChemical stabilityFuel cell
Tong Mu、Lele Wang、Qian Wang、Yang Wu、Patric Jannasch、Jingshuai Yang
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Department of Chemistry,College of Sciences,Northeastern University,Shenyang 110819,Liaoning,China
College of Chemistry,Liaoning University,Shenyang 10036,Liaoning,China
Polymer & Materials Chemistry,Department of Chemistry,Lund University,SE-221 00 Lund,Sweden
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