College of Engineering and Applied Sciences, National Laboratory of Solid State Microstructures, and Collaborative Innovation Center of Advanced Microstructures, Nanjing University, Nanjing, 210093, P. R. China.
Key Laboratory of Intelligent Optical Sensing and Manipulation, Nanjing University, Nanjing, 210093, P. R. China.
Small. 2023 May;19(21):e2300386. doi: 10.1002/smll.202300386. Epub 2023 Feb 23.
Stretchable microsupercapacitors represent emerging miniaturized energy-storage devices for next-generation deformable electronics. Two-dimensional (2D) transition metal carbides (MXenes) are considered attractive electrode materials due to their metallic conductivity, hydrophilic surfaces, and excellent processability. Here, an ultrastretchable microsupercapacitor of interdigitated MXene microelectrodes with crumpled surface textures is created. The microsupercapacitor shows a series of attractive properties including a high specific capacitance of ≈185 mF cm , ultrahigh stretchability up to 800% area strain, and ≈89.7% retention of the initial capacitance after 1000 stretch-relaxation cycles. In addition to static strains, the microsupercapacitor demonstrates robust mechanical properties to retain stable charging-discharging capability under dynamic stretching at different strain rates. A self-powering circuit system utilizes four microsupercapacitor packs to power a light-emitting diode (LED) array, which exhibits stable operations under large tensile strain and skin-attached wearable settings. The developments offer a generic design strategy to enhance the deformability of microsupercapacitors based on 2D nanomaterials.
可拉伸的微型超级电容器是下一代可变形电子产品中新兴的小型化储能器件。二维（2D）过渡金属碳化物（MXenes）因其具有金属导电性、亲水表面和优异的可加工性而被认为是有吸引力的电极材料。在这里，创建了具有褶皱表面纹理的叉指式 MXene 微电极的超拉伸微型超级电容器。该微型超级电容器具有一系列吸引人的特性，包括约 185 mF cm 的高比电容、高达 800%的面积应变的超高拉伸性，以及在 1000 次拉伸-松弛循环后初始电容保留率约为 89.7%。除了静态应变外，微型超级电容器还表现出强大的机械性能，可在不同应变速率的动态拉伸下保持稳定的充放电能力。一个自供电电路系统利用四个微型超级电容器组为一个发光二极管（LED）阵列供电，该系统在大拉伸应变和皮肤附着的可穿戴设置下表现出稳定的工作性能。这些发展为基于 2D 纳米材料的微型超级电容器的可变形性提供了一种通用的设计策略。
