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Robust and Flexible Aramid Nanofiber/Graphene Layer-by-Layer Electrodes
ACS Applied Materials & Interfaces ( IF 8.3 ) Pub Date : 2017-04-28 00:00:00 , DOI: 10.1021/acsami.7b03449 Se Ra Kwon 1 , Meagan B. Elinski 1 , James D. Batteas 1 , Jodie L. Lutkenhaus 1
ACS Applied Materials & Interfaces ( IF 8.3 ) Pub Date : 2017-04-28 00:00:00 , DOI: 10.1021/acsami.7b03449 Se Ra Kwon 1 , Meagan B. Elinski 1 , James D. Batteas 1 , Jodie L. Lutkenhaus 1
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Aramid nanofibers (ANFs), or nanoscale Kevlar fibers, are of interest for their high mechanical performance and functional nanostructure. The dispersible nature of ANFs opens up processing opportunities for creating mechanically robust and flexible nanocomposites, particularly for energy and power applications. The challenge is to manipulate ANFs into an electrode structure that balances mechanical and electrochemical performance to yield a robust and flexible electrode. Here, ANFs and graphene oxide (GO) sheets are blended using layer-by-layer (LbL) assembly to achieve mechanically flexible supercapacitor electrodes. After reduction, the resulting electrodes exhibit an ANF-rich structure where ANFs act as a polymer matrix that interfacially interacts with reduced graphene oxide sheets. It is shown that ANF/GO deposition proceeds by hydrogen bonding and π–π interactions, leading to linear growth (1.2 nm/layer pairs) and a composition of 75 wt % ANFs and 25 wt % GO sheets. Chemical reduction leads to a high areal capacitance of 221 μF/cm2, corresponding to 78 F/cm3. Nanomechanical testing shows that the electrodes have a modulus intermediate between those of the two native materials. No cracks or defects are observed upon flexing ANF/GO films 1000 times at a radius of 5 mm, whereas a GO control shows extensive cracking. These results demonstrate that electrodes containing ANFs and reduced GO sheets are promising for flexible, mechanically robust energy and power.
中文翻译：
坚固而灵活的芳纶纳米纤维/石墨烯层状电极
芳族聚酰胺纳米纤维（ANF）或纳米级凯夫拉尔纤维因其高机械性能和功能性纳米结构而备受关注。ANFs的可分散性质为制造机械坚固且灵活的纳米复合材料（特别是在能源和电力应用中）打开了加工机会。面临的挑战是将ANF操纵成平衡机械和电化学性能的电极结构，以生产出坚固耐用的柔性电极。在这里，ANF和氧化石墨烯（GO）板使用逐层（LbL）组件进行混合，以实现机械柔性超级电容器电极。还原后，所得电极表现出富含ANF的结构，其中ANF充当与还原的氧化石墨烯片界面相互作用的聚合物基质。结果表明，ANF / GO沉积是通过氢键和π-π相互作用进行的，从而导致线性生长（1.2 nm /层对），并且组成为75 wt％的ANF和25 wt％的GO片。化学还原会导致221μF/ cm的高面电容2，对应于78 F / cm 3。纳米机械测试表明，电极的模量介于两种天然材料的模量之间。在以5 mm的半径弯曲ANF / GO膜1000次后，未观察到裂纹或缺陷，而GO控件显示出大量裂纹。这些结果表明，含有ANFs和减少的GO薄板的电极有望提供柔性，机械坚固的能量和功率。
更新日期：2017-05-11
中文翻译：
坚固而灵活的芳纶纳米纤维/石墨烯层状电极
芳族聚酰胺纳米纤维（ANF）或纳米级凯夫拉尔纤维因其高机械性能和功能性纳米结构而备受关注。ANFs的可分散性质为制造机械坚固且灵活的纳米复合材料（特别是在能源和电力应用中）打开了加工机会。面临的挑战是将ANF操纵成平衡机械和电化学性能的电极结构，以生产出坚固耐用的柔性电极。在这里，ANF和氧化石墨烯（GO）板使用逐层（LbL）组件进行混合，以实现机械柔性超级电容器电极。还原后，所得电极表现出富含ANF的结构，其中ANF充当与还原的氧化石墨烯片界面相互作用的聚合物基质。结果表明，ANF / GO沉积是通过氢键和π-π相互作用进行的，从而导致线性生长（1.2 nm /层对），并且组成为75 wt％的ANF和25 wt％的GO片。化学还原会导致221μF/ cm的高面电容2，对应于78 F / cm 3。纳米机械测试表明，电极的模量介于两种天然材料的模量之间。在以5 mm的半径弯曲ANF / GO膜1000次后，未观察到裂纹或缺陷，而GO控件显示出大量裂纹。这些结果表明，含有ANFs和减少的GO薄板的电极有望提供柔性，机械坚固的能量和功率。
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