Key Laboratory of Advanced Civil Engineering Materials, Ministry of Education, Shanghai Key Laboratory of Development and Application for Metal-Functional Materials, School of Materials Science & Engineering, Tongji University, 4800 Caoan Road, Shanghai 201804, China.
Key Laboratory of Advanced Civil Engineering Materials, Ministry of Education, Shanghai Key Laboratory of Development and Application for Metal-Functional Materials, School of Materials Science & Engineering, Tongji University, 4800 Caoan Road, Shanghai 201804, China.
J Colloid Interface Sci. 2022 Dec;627:142-150. doi: 10.1016/j.jcis.2022.07.050. Epub 2022 Jul 11.
Fiber-shaped supercapacitors (FSCs) are considered as the optimal candidate for wearable energy devices, due to their high safety, excellent electrochemical stability, workability and body adaptability. However, the specific capacitances of today's FSCs such as carbon nanotube fibers and graphene fibers, are still not high enough for practical applications due to the limitation of their energy storage mode. So, we design a ternary composite fiber-shaped electrode: First, a kind of metal organic framework (MOF), copper-catecholate (Cu-CAT) nanorods, are in-situ grown on a wet-spun poly(3,4-ethylenedioxythiophene): poly(styrenesulfonate) (PEDOT:PSS) fiber at the ambient temperature. Second, polypyrrole (PPy) is electrodeposited on the surface of the Cu-CAT/PEDOT:PSS fiber to obtain PPy@Cu-CAT@PEDOT:PSS fiber (PPy@Cu-CAT@PF). The growing Cu-CAT with high porosity anchored on the fiber surface provides electrochemical activate sites and the encapsulation of PPy effectively provides a continuous charge transfer path and improve its cycling stability. Notably, the PPy@Cu-CAT@PF electrode exhibits a satisfactory areal capacitance of 669.93 mF cm at 2 mA cm, which remains 61.66% even at a high current density of 20 mA cm. Furthermore, the assembled symmetric FSC displays excellent electrochemical properties and outstanding mechanical flexibility, demonstrating its feasibility as a wearable supercapacitor.
纤维状超级电容器（FSCs）因其高安全性、优异的电化学稳定性、可加工性和身体适应性而被认为是可穿戴能源设备的最佳候选者。然而，由于其储能模式的限制，当今的 FSCs（如碳纳米管纤维和石墨烯纤维）的比电容仍然不够高，无法满足实际应用的需求。因此，我们设计了一种三元复合纤维状电极：首先，在室温下，将一种金属有机骨架（MOF），即铜儿茶酚（Cu-CAT）纳米棒，原位生长在湿法纺丝的聚（3,4-亚乙基二氧噻吩）：聚（苯乙烯磺酸盐）（PEDOT：PSS）纤维上。其次，在 Cu-CAT/PEDOT：PSS 纤维表面电沉积聚吡咯（PPy），得到 PPy@Cu-CAT@PEDOT：PSS 纤维（PPy@Cu-CAT@PF）。在纤维表面锚定的具有高孔隙率的生长 Cu-CAT 提供了电化学活性位点，而 PPy 的封装有效地提供了连续的电荷转移路径，并提高了其循环稳定性。值得注意的是，PPy@Cu-CAT@PF 电极在 2 mA cm 时表现出令人满意的面电容 669.93 mF cm，即使在 20 mA cm 的高电流密度下，其电容保持率仍为 61.66%。此外，组装的对称 FSC 显示出优异的电化学性能和出色的机械灵活性，证明了其作为可穿戴超级电容器的可行性。
