论文标题
Nafion $^{（R）} $膜的石墨烯涂层用于增强燃料电池性能
Graphene coating of Nafion$^{(R)}$ membranes for enhanced fuel cell performance
论文作者
论文摘要
nafion $^{（r）} $膜上的电化学去角质石墨烯（E-G）薄膜对不良燃料交叉具有选择性的屏障效果。该方法结合了最先进的Nafion $^{（R）} $的高质子电导率以及E-G层有效阻断甲醇和氢的运输的能力。 nafion $^{（r）} $膜在阳极侧涂有E-G的水分散体，利用宽松且可扩展的喷雾过程。扫描透射电子显微镜（Stem）和电子损坏光谱（EEL）证实形成了充当扩散屏障的致密渗透石墨烯薄片网络。直接甲醇燃料电池（DMFC）操作的最大功率密度，具有E-G涂层的Nafion $^{（R）} $ N115 $ 3.9倍，比Nafion $^{（r）} $ N115参考（39 vs. 10 mw cm $^{ - 2} $ @ 0.3 V），在5m二苯酚供料浓度下。这表明将E-G涂层的Nafion $^{（r）} $膜应用于便携式DMFC，其中希望使用高度浓缩的甲醇。
Electrochemically exfoliated graphene (e-G) thin films on Nafion$^{(R)}$ membranes exhibit a selective barrier effect against undesirable fuel crossover. The approach combines the high proton conductivity of state-of-the-art Nafion$^{(R)}$ and the ability of e-G layers to effectively block the transport of methanol and hydrogen. Nafion$^{(R)}$ membranes are coated with aqueous dispersions of e-G on the anode side, making use of a facile and scalable spray process. Scanning transmission electron microscopy (STEM) and electron energy-loss spectroscopy (EELS) confirm the formation of a dense percolated graphene flake network which acts as diffusion barrier. The maximum power density in direct methanol fuel cell (DMFC) operation with e-G coated Nafion$^{(R)}$ N115 is 3.9 times higher than the Nafion$^{(R)}$ N115 reference (39 vs. 10 mW cm$^{-2}$ @ 0.3 V) at 5M methanol feed concentration. This suggests the application of e-G coated Nafion$^{(R)}$ membranes for portable DMFCs, where the use of highly concentrated methanol is desirable.
