Shang Yinghui, Wei Junjie, Wu Chu, Wang Qigang
School of Chemical Science and Engineering , Tongji University , Shanghai 200092 , P. R. China.
ACS Appl Mater Interfaces. 2018 Dec 12;10(49):42959-42966. doi: 10.1021/acsami.8b12106. Epub 2018 Nov 30.
Polymer gel electrolytes (PGEs) have been considered as one of the most promising candidates to solve safety and flexibility issues in wearable devices. To supply energy for the daily-used epidermal electronic systems, biaxial stretchability and temperature tolerance are essential for energy storage units. However, the limited choices of PGEs, including fragile poly(vinyl alcohol) and uniaxial stretchable polyacrylamide hydrogel, lag far behind the requirement of wearable supercapacitors. Herein, an adhesive organohydrogel with a water/ethylene glycol binary solvent is tailored as the electrolyte of an all-climate, biaxially stretchable pseudocapacitor. The adhesive organohydrogel electrolyte facilitates the device assembly with carbon nanotube (CNT) paper electrodes and electroactive 2-pyridinethiol. The final pseudocapacitor has the highest specific capacitance 364 F/g and all-climate stability ranging from -40 to 80 °C. More importantly, this pseudocapacitor can be biaxially stretched up to 400% of its area. This work provides the first example of using organohydrogel electrolytes in biaxially stretchable and all-climate pseudocapacitors and a platform to design stretchable electronics and devices with high performance and all-climate tolerance.
聚合物凝胶电解质（PGEs）被认为是解决可穿戴设备安全性和柔韧性问题最具潜力的候选材料之一。为日常使用的表皮电子系统提供能量，储能单元必须具备双轴拉伸性和耐温性。然而，PGEs的选择有限，包括易碎的聚乙烯醇和单轴可拉伸的聚丙烯酰胺水凝胶，远远落后于可穿戴超级电容器的需求。在此，一种含有水/乙二醇二元溶剂的粘性有机水凝胶被定制为全气候、双轴可拉伸赝电容器的电解质。这种粘性有机水凝胶电解质便于使用碳纳米管（CNT）纸电极和电活性2-吡啶硫醇组装器件。最终的赝电容器具有364 F/g的最高比电容和-40至80°C的全气候稳定性。更重要的是，这种赝电容器可在双轴方向上拉伸至其面积的400%。这项工作首次展示了在双轴可拉伸和全气候赝电容器中使用有机水凝胶电解质，并为设计高性能和全气候耐受性的可拉伸电子器件提供了一个平台。
