State Key Laboratory of Molecular Engineering of Polymers, Department of Macromolecular Science, Fudan University , Shanghai 200433, P. R. China.
ACS Appl Mater Interfaces. 2017 Jul 12;9(27):22620-22627. doi: 10.1021/acsami.7b06117. Epub 2017 Jun 26.
A facile method to prepare high-performance Nafion slightly reduced graphene oxide membranes (N-srGOMs) via vacuum filtration is proposed. The long-range connected ionic nanochannels in the membrane are constructed via the concentration-dependent self-assembling of the amphiphilic Nafion and the hydrophilic-hydrophobic interaction between graphene oxide (GO) and Nafion in water. The obtained N-srGOM possesses high proton conductivity, and low methanol permeability benefitted from the constructed unique interior structures. The proton conductivity of N-srGOM reaches as high as 0.58 S cm at 80 °C and 95%RH, which is near 4-fold of the commercialized Nafion 117 membrane under the same condition. The methanol permeability of N-srGOM is 2.0 × 10 cm s, two-magnitude lower than that of Nafion 117. This novel membrane fabrication strategy has proved to be highly efficient in overcoming the "trade-off" effect between proton conductivity and methanol resistance and displays great potential in DMFC application.
提出了一种通过真空过滤制备高性能 Nafion 轻度还原氧化石墨烯膜（N-srGOM）的简便方法。该方法通过两亲性 Nafion 与氧化石墨烯（GO）在水中的浓度依赖性自组装以及 GO 和 Nafion 之间的亲水性-疏水性相互作用，构建了具有长程离子纳米通道的膜。所制备的 N-srGOM 具有较高的质子电导率和较低的甲醇渗透率，这得益于其独特的内部结构。在 80°C 和 95%相对湿度下，N-srGOM 的质子电导率高达 0.58 S cm，是相同条件下商业化 Nafion 117 膜的近 4 倍。N-srGOM 的甲醇渗透率为 2.0×10 cm s，比 Nafion 117 低两个数量级。该新型膜制备策略在克服质子电导率和甲醇阻透率之间的“权衡”效应方面表现出了极高的效率，在 DMFC 应用中具有巨大的潜力。
