College of Materials Science and Engineering, Institute for Graphene Applied Technology Innovation, Qingdao University, Qingdao 266071, China.
College of Materials Science and Engineering, Institute for Graphene Applied Technology Innovation, Qingdao University, Qingdao 266071, China.
J Colloid Interface Sci. 2019 Dec 1;557:617-627. doi: 10.1016/j.jcis.2019.09.065. Epub 2019 Sep 18.
Compressible and flexible supercapacitors have aroused enormous interest of many scientific researchers for potential applications in wearable electronic products. However, the design and construction of the electrode with superior mechanical as well as electrical properties still face a lot of challenges. In present work, melamine foam/polypyrrole (MF/PPy) electrode with high deformation-tolerance and excellent electrochemical performance is prepared by in-situ interfacial polymerization of polypyrrole on commercial melamine foam, where PPy nanoparticles with size of 700 nm are uniformly anchored on the MF skeletons. The electrochemical characterizations show that the electrode exhibits excellent specific area capacitance of 2.685 F cm at 2 mA cm and good cyclic stability with more than 80% of capacitance remained after 3000 cycles. Furthermore, a symmetrical aqueous supercapacitor is assembled and exhibits an excellent energy density up to 75.95 μWh cm at the power density of 5.82 mW cm and excellent cycling stability as the current density increases by 10 times. Even under a high strain of 70%, about 95.76% of the initial capacitance is retained after 500 consecutive compressions. These outstanding performances enable the MF/PPy composite a promising candidate for potential applications in compressible and flexible electrochemical energy storage devices.
可压缩和柔韧的超级电容器因其在可穿戴电子产品中的潜在应用而引起了许多科研人员的极大兴趣。然而，具有优异机械和电气性能的电极的设计和构建仍然面临许多挑战。在本工作中，通过在商业三聚氰胺泡沫上原位界面聚合聚吡咯，制备了具有高变形容忍度和优异电化学性能的三聚氰胺泡沫/聚吡咯（MF/PPy）电极，其中尺寸为 700nm 的 PPy 纳米颗粒均匀锚定在 MF 骨架上。电化学特性表明，该电极在 2mA/cm 时具有出色的比表面积电容 2.685F/cm，并且具有良好的循环稳定性，在 3000 次循环后电容保持率超过 80%。此外，组装了一个对称的水系超级电容器，在 5.82mW/cm 的功率密度下表现出高达 75.95μWh/cm 的优异能量密度和出色的循环稳定性，当电流密度增加 10 倍时。即使在 70%的高应变下，经过 500 次连续压缩后，初始电容仍保持在 95.76%左右。这些出色的性能使 MF/PPy 复合材料成为可压缩和柔韧电化学储能器件的有前途的候选材料。
