摘要
An imidazolium functionalized poly(ether ether ketone ketone)(PEEKK-DIm OH)anion exchange membrane(AEM)readily soluble in certain low-boiling-point solvents(isopropanol)is prepared.The solubility results are consistent with the results of molecular dynamics simulations.By varying the chloromethylation reaction temperature or concentrated sulfuric acid concentration of PEEKK,the degrees of chloromethylation of PEEKK are changed from 54% to 92%,the corresponding PEEKK-DIm OH AEMs with the ion exchange capacities(IECs)of 1.14–1.65 mmol·g^(-1).The PEEKK-DIm OH 92% AEM shows high hydroxide conductivity(31 m S·cm^(-1)),suitable water uptake(94%)and acceptable swelling ratio(39%)at 60°C.In addition,the PEEKK-DIm OH AEMs possess good thermal and alkaline stability.The maximum power density(46.16 mW·cm^(-2))of fuel cell prepared with PEEKK-DIm OH 92%AEM as exchange membrane and ionomer is much higher than that with commercial AHA membranes.All the above results indicate that the PEEKK used in this study is a promising AEM matrix material for alkaline fuel cells.
An imidazolium functionalized poly（ether ether ketone ketone）（PEEKK-DIm OH）anion exchange membrane（AEM）readily soluble in certain low-boiling-point solvents（isopropanol）is prepared.The solubility results are consistent with the results of molecular dynamics simulations.By varying the chloromethylation reaction temperature or concentrated sulfuric acid concentration of PEEKK,the degrees of chloromethylation of PEEKK are changed from 54% to 92%,the corresponding PEEKK-DIm OH AEMs with the ion exchange capacities（IECs）of 1.14–1.65 mmol·g-1.The PEEKK-DIm OH 92% AEM shows high hydroxide conductivity（31 m S·cm-1）,suitable water uptake（94%）and acceptable swelling ratio（39%）at 60°C.In addition,the PEEKK-DIm OH AEMs possess good thermal and alkaline stability.The maximum power density（46.16 mW·cm-2）of fuel cell prepared with PEEKK-DIm OH 92%AEM as exchange membrane and ionomer is much higher than that with commercial AHA membranes.All the above results indicate that the PEEKK used in this study is a promising AEM matrix material for alkaline fuel cells.
基金
Supported by the National Natural Science Foundation of China(21706023,21476044,21406031)
the National Key Research and Development Program of China(2016YFB0101203)
Education Department of Liaoning Province of China(LT2015007)
Fundamental Research Funds for the Central Universities(DUT16TD19)
the Changjiang Scholars Program(T2012049)
