Artie McFerrin Department of Chemical Engineering, Texas A&M University , 3122 TAMU, College Station, Texas 77843-3122, United States.
ACS Appl Mater Interfaces. 2013 Oct 23;5(20):10127-36. doi: 10.1021/am402809e. Epub 2013 Oct 9.
Polymeric electrodes that can achieve high doping levels and store charge reversibly are desired for electrochemical energy storage because they can potentially achieve high specific capacities and energies. One such candidate is the polyaniline:poly(2-acrylamido-2-methyl-1-propanesulfonic acid) (PANI:PAAMPSA) complex, a water-processable complex obtained via template polymerization that is known to reversibly achieve high doping levels at potentials of up to 4.5 V versus Li/Li+. Here, for the first time, PANI:PAAMPSA is successfully incorporated into layer-by-layer (LbL) electrodes. This processing technique is chosen for its ability to blend species on a molecular level and its ability to conformally coat a substrate. Three different polyaniline-based LbL electrodes comprised of PANI/PAAMPSA, PANI/PANI:PAAMPSA, and linear poly(ethylenimine)/PANI:PAAMPSA are compared in terms of film growth, charge storage, and reversibility. We found that the reversibility of PANI:PAAMPSA is retained within the LbL electrodes and that the PANI/PANI:PAAMPSA electrode exhibits the best performance in terms of capacity and cycle life. These results provide general guidelines for the assembly of PANI:PAAMPSA in LbL films and also demonstrate their potential as electrochemically active components in electrodes.
用于电化学储能的聚合物电极需要具有高掺杂水平和可逆电荷存储能力，因为它们有可能实现高比容量和能量。聚（苯胺：聚（2-丙烯酰胺基-2-甲基-1-丙磺酸））复合物是这样的候选物之一，它是一种通过模板聚合得到的可水溶复合物，已知在高达 4.5 V 相对于 Li/Li+的电势下可实现高掺杂水平的可逆性。在这里，首次成功地将 PANI:PAAMPSA 掺入层层（LbL）电极中。选择这种处理技术是因为它能够在分子水平上混合物质，并且能够对基底进行共形涂覆。在薄膜生长、电荷存储和可逆性方面，比较了由 PANI/PAAMPSA、PANI/PANI:PAAMPSA 和线性聚（乙二胺）/PANI:PAAMPSA 组成的三种不同的基于聚（苯胺）的 LbL 电极。我们发现，PANI:PAAMPSA 的可逆性在 LbL 电极中得以保留，并且 PANI/PANI:PAAMPSA 电极在容量和循环寿命方面表现出最佳性能。这些结果为在 LbL 薄膜中组装 PANI:PAAMPSA 提供了一般性指导，并展示了它们作为电极中电化学活性组件的潜力。
