Crosslinked hydroxyl‐conductive copolymer/silica composite membranes based on addition‐type polynorbornene for alkaline anion exchange membrane fuel cell applications |
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| Authors: | Xiaohui He Xiong Jiang Zijie Wang Yingjiao Deng Zhilong Han Yingping Yang Defu Chen |
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| Affiliation: | 1. School of Materials Science and Engineering, Nanchang University, 999 Xuefu Avenue, Nanchang, People's Republic of China;2. Jiangxi Provincial Key Laboratory of New Energy Chemistry, Nanchang University, 999 Xuefu Avenue, Nanchang, People's Republic of China;3. School of Civil Engineering and Architecture, Nanchang University, 999 Xuefu Avenue, Nanchang, People's Republic of China |
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| Abstract: | Crosslinked hydroxyl‐conductive copolymer/silica composite membranes based on addition‐type polynorbornene, poly(dodoxymethylene norbornene‐co‐norbornene‐3‐(trimethylpropyl ammonium)‐functionalized silica (QP(DNB/NB‐SiO2), were prepared by a sol–gel method. Copolymer composite membranes with different degree of quaternary ammonium functional silica, designated as QP(DNB/NB‐SiO2‐X) (X = 5, 10, 15 and 25 wt%, respectively), displayed good dimensional stabilities with low in‐plane swelling rate of 1.32–3.7%, good mechanical properties with high elastic modulus of 605.4–756.8 MPa and high tensile strength of 13.2–20 Mpa. The achieved copolymer composite membranes could self‐assemble into a microphase‐separated morphology with randomly oriented long‐range aliphatic chain/cylinder ionic channels that were imbedded in the hydrophobic PNB matrix. Among these membranes, the QP(DNB/NB‐SiO2‐25) showed the parameter with ionic conductivity of 9.33 × 10?3S cm?1, methanol permeability of 2.89 × 10?7cm2 s?1, and ion‐exchange capacity(IEC) of 1.19 × 10?3 mol g?1. A current density of 82.3mA cm?2, the open circuit voltage of 0.65 V and a peek power density of 32 mW cm?2 were obtained. POLYM. ENG. SCI., 58:13–21, 2018. © 2017 Society of Plastics Engineers |
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