Effects of Cu2+ Counter Ions on the Actuation Performance of Flexible Ionic Polymer Metal Composite Actuators
Effects of Cu2+ Counter Ions on the Actuation Performance of Flexible Ionic Polymer Metal Composite Actuators
复制标题
Cu2+反离子对柔性离子聚合物金属复合驱动器驱动性能的影响
DOI：
10.1007/s42235-018-0092-y
复制
发表时间：
2018-11-01
影响因子：
4
通讯作者：
Liu, Lei
中科院分区：
文献类型：
--
作者：
Wang, Maolin;Yu, Min;Liu, Lei
离子聚合物金属复合材料（IPMC）电极的电阻对IPMC执行器的驱动性能起着重要作用。由于铂电极表面形成裂纹，导致电极表面电阻增大，极大地限制了其驱动性能。在本文中，我们提出了一种通过将Cu2+交换到IPMC基底膜中的动态自修复电极的新方法。制备了带有 Cu2+ 的 IPMC 致动器，并随后测量了空气中的致动性能。与传统的含有Li+抗衡离子的IPMC驱动器相比，含有Cu2+抗衡离子的IPMC驱动器表现出2倍至3倍的位移和2倍至3倍的阻挡力。在形貌观察中，我们发现经过多次弯曲循环后，裂纹中间散落出许多细小的铜颗粒，导致电极电阻明显下降。在循环伏安（CV）扫描测量中，我们观察到随着电压极性的变化，铜的氧化反应与铜离子的还原反应交替出现，这是一个动态过程。基于这些分析，得出结论：Cu2+的存在可以修复受损的电极并降低电极电阻，从而提高驱动性能。
The resistance of Ionic Polymer Metal Composite (IPMC) electrodes plays an important role in the actuation performance of IPMC actuators. Owing to crack formation on the surface of platinum electrode, the surface resistance of the electrode increases, which greatly limits its actuating performance. In this paper, we proposed a new method of dynamic self-repair electrodes by exchanging Cu2+ into the IPMC basement membrane. IPMC actuators with Cu2+ were prepared and the actuation performance in the air was subsequently measured. Compared with conventional IPMC actuators containing Li+ counter ions, those containing Cu2+ counter ions exhibited 2 times –3 times larger displacement and 2 times–3 times bigger blocking force. In the morphology observation, we found that many small copper particles scattered in the middle of cracks after several bending cycles, which leads to an obvious decrease in electrode resistance. In the Cyclic Voltammetry (CV) scan measurement, we observed that the oxidation reaction of copper alternates with reduction reaction of copper ions with the change of voltage polarity, which was a dynamic process. Based on these analyses, it is concluded that the presence of Cu2+ can repair the damaged electrodes and induce lower electrode resistance, thus leading to the performance improvement of actuation.