This work reports the electrochemical properties of stretchable supercapacitors fabricated with carbon nanotubes (CNTs) sheets as electrodes. According to the SEM images of the electrodes, the CNTs look like interconnected wires oriented in one direction. The electrochemical analysis indicated that the devices subjected from 0 to 150% strain decreased their capacitance from 712.2 to 88.4 F/g. Interestingly, the device stretched 525 times at 50% strain had a capacitance of 1328.3 F/g, which is one of the highest capacitance values reported so far for stretchable supercapacitors. The cycling voltammetry curves of the stretched devices showed redox peaks, suggesting that these devices store charge by Faradaic reactions. The presence of redox centers (carboxylic groups and oxygen vacancies) was confirmed by Fourier transform infrared spectroscopy, optical absorbance measurements, and X-ray photoelectron spectroscopy measurements. The galvanostatic charge/discharge curves showed the presence of two components: capacitive (discharge with exponential decay) and battery-type (stable output voltage). This output voltage was controlled with the strain %, since values of 1.05 V, 0.72 V, and 0.32 V were obtained for 0, 50, and 100% strain, respectively. The high capacitance and stable voltage demonstrated by the devices suggest that they could be used as energy sources in wearable/portable applications.

这项工作报告了以碳纳米管（CNTs）片为电极制成的可拉伸超级电容器的电化学性能。根据电极的SEM图像，CNT看起来像互连的导线朝向一个方向。电化学分析表明，承受0至150％应变的器件的电容从712.2 F / g降低至88.4 F / g。有趣的是，在50％应变下拉伸525次的器件的电容为1328.3 F / g，这是迄今为止针对可拉伸超级电容器所报告的最高电容值之一。拉伸装置的循环伏安曲线显示了氧化还原峰，表明这些装置通过法拉第反应存储电荷。氧化还原中心（羧基和氧空位）的存在已通过傅立叶变换红外光谱，光学吸收率测量和X射线光电子能谱测量得到证实。恒电流充电/放电曲线表明存在两个成分：电容（具有指数衰减的放电）和电池类型（稳定的输出电压）。该输出电压由应变％控制，因为对于0％，50％和100％应变，分别获得1.05 V，0.72 V和0.32 V的值。器件显示出的高电容和稳定电压表明它们可以用作可穿戴/便携式应用中的能源。