Mechanically strong, flexible and deformable supercapacitors (SCs) are of particular interest for the wearable electronics. Therefore, stretchable dual SCs composed of two single devices were fabricated and studied in this research. Soft SC electrodes were made of plasticine decorated with graphene microplates and had cylindrical shape. To enhance the capacitance of the devices, Ce_0.8Nd_0.1Ni_0.1O_2-δ (CNNO) particles were added as redox material in the SC electrodes. Electrochemical tests were performed for the single SCs made only with graphene electrodes and produced capacitances/energy-densities of 178–215 F g⁻¹/24–30 W h kg⁻¹. When the single graphene supercapacitors are connected in-series, a maximum specific capacitance/energy density of 370.9 F g⁻¹/51.4 W h kg⁻¹ is obtained. The single SCs made with CNNO particles had higher specific capacitances/energy-densities of 326–436 F g⁻¹/45–61 W h kg⁻¹. The SCs made with CNNO were connected in-series and in-parallel, producing specific capacitances/energy densities of 257.1 F g⁻¹/35.7 W h kg⁻¹ and 516 F g⁻¹/71.7 W h kg⁻¹, respectively. Thus, incorporating the CNNO particles to the SCs enhanced their capacitance by 51–144%. According to the CV curves, the current densities are increased from 6 to 15 A g⁻¹ to 37 A g⁻¹ when the single devices are connected in-parallel. If the single devices are connected in-series, the output voltages of the supercapacitors increased from 1 to 1.3 V. The devices were also subjected to stretching at 25% and the capacitance dropped by 90–96.5% because the electrodes were broken. However, the devices were unstretched and the capacitance was recovered by ≈ 40–60%. If those last devices are heated at 50 °C, the SC electrodes are totally repaired, and the capacitance is even 12–33% higher in comparison with the original capacitance for the non-stretched device. Additionally, absorbance, Raman and XPS analyses revealed the presence of oxygen vacancies, Ce³⁺/Ce⁴⁺, Nd⁰/Nd¹⁺/Nd³⁺ and Ni⁰/Ni²⁺/Ni³⁺, which worked as redox centers for the charge storage. In summary, the results presented here demonstrate that our stretchable SC can operate in-series or in-parallel connection and their electrodes can be re-built after applying heat. The cost of those SCs is drastically reduced because they are made with plasticine and due to their flexibility and stretchability, they are good candidates for wearable applications, which require deformable devices.

机械强度高、柔韧且可变形的超级电容器（SC）对于可穿戴电子产品特别令人感兴趣。因此，本研究制造并研究了由两个单一器件组成的可拉伸双SC。软 SC 电极由装饰有石墨烯微板的橡皮泥制成，呈圆柱形。为了增强器件的电容，在SC电极中添加Ce _0.8 Nd _0.1 Ni _0.1 O _{2-δ (CNNO)颗粒作为氧化还原材料。}对仅用石墨烯电极制成的单个 SC 进行了电化学测试，并产生了 178–215 F g ^-1 /24–30 W h kg ^-1的电容/能量密度。当单个石墨烯超级电容器串联时，获得370.9 F g ^-1 /51.4 W h kg ^{-1的最大比电容/能量密度。}由 CNNO 颗粒制成的单个 SC 具有更高的比电容/能量密度，为 326-436 F g ^-1 /45-61 W h kg ^-1。用CNNO制成的SC串联和并联连接，分别产生257.1 F g ^-1 /35.7 W h kg ^-1和516 F g ^-1 /71.7 W h kg ^{-1的比电容/能量密度}。因此，将 CNNO 颗粒加入 SC 中，其电容提高了 51-144%。根据CV曲线，当单个器件并联时，电流密度从6A g -1 增加到15 A g ^-1到37 A g ^{-1 。}如果将单个器件串联，超级电容器的输出电压从 1 V 增加到 1.3 V。器件还受到 25% 的拉伸，由于电极断裂，电容下降了 90-96.5%。然而，器件未拉伸，电容恢复了约 40-60%。如果最后的器件在 50°C 下加热，SC 电极将被完全修复，并且与未拉伸器件的原始电容相比，电容甚至高出 12-33%。此外，吸光度、拉曼和XPS分析揭示了氧空位、Ce ³⁺ /Ce ⁴⁺、Nd ⁰ /Nd ¹⁺ /Nd ³⁺和Ni ⁰ /Ni ²⁺ /Ni ³⁺的存在，它作为电荷存储的氧化还原中心。总之，这里给出的结果表明我们的可拉伸 SC 可以串联或并联运行，并且它们的电极可以在加热后重建。这些 SC 的成本大大降低，因为它们是用橡皮泥制成的，并且由于其灵活性和可拉伸性，它们是需要可变形设备的可穿戴应用的良好候选者。