School of Chemistry & Chemical Engineering , Chongqing University , Chongqing 400044 , P. R. China.
State Key Laboratory of Polymer Materials Engineering , Sichuan University , Chengdu 610065 , Sichuan , P. R. China.
ACS Appl Mater Interfaces. 2018 Jul 18;10(28):23774-23782. doi: 10.1021/acsami.8b05298. Epub 2018 Jul 2.
High ion conductivity of anion-exchange membrane is essential for the operation of alkaline anion-exchange membrane fuel cell. In this work, we demonstrated an effective strategy to enhance the conductivity of anion-exchange membrane (AEM), by incorporation of quaternized cellulose nanocrystal (QCNC) for the first time. Morphology observation demonstrated a uniform distribution of QCNC within QPPO matrix, as well as a clear QCNC network, which led to significant enhancement in hydroxide conductivities of composite membranes, for example, 2 wt % QCNC/QPPO membrane possessed a conductivity of 160% (60 mS cm, @80 °C) of that of QPPO. Furthermore, H/O cell performance of membrane electrode assembly based on 2 wt % QCNC/QPPO AEM showed an excellent peak power density of 392 mV cm at 60 °C without back pressure, whereas that of neat QPPO AEM was only 270 mV cm.
阴离子交换膜的高离子电导率对于碱性阴离子交换膜燃料电池的运行至关重要。在这项工作中，我们首次展示了一种通过引入季铵化纤维素纳米晶体（QCNC）来增强阴离子交换膜（AEM）导电性的有效策略。形貌观察表明，QCNC 在 QPPO 基体中分布均匀，且存在清晰的 QCNC 网络，这导致复合膜的氢氧根电导率得到显著提高，例如，2wt%QCNC/QPPO 膜的电导率比 QPPO 提高了 160%（60°C 时为 60 mS cm）。此外，基于 2wt%QCNC/QPPO AEM 的膜电极组件的 H/O 电池性能在 60°C 时无背压下表现出优异的峰值功率密度 392 mV cm，而纯 QPPO AEM 仅为 270 mV cm。
