With the growing demand for wearable electronics, developing new compatible energy systems is a prominent topic of research. Energy systems mounted on wearable electronics should exhibit high cost efficiency, mechanical robustness, and high electrochemical activity. Herein, all‐carbon‐based large‐area nanocomposites for freely deformable electrochemical capacitors are suggested to address these requirements. The three‐dimensionally integrated, self‐supported nanocomposites consist of activated carbons (ACs) distributed in direct spinning‐derived carbon nanotube (DS‐CNT) sheets without any additives, including conducting agents or binders. Owing to synergetic effects of the highly porous AC particles, high electron transport kinetics of CNTs, and facile ion accessibility resulting from acid treatment, the nanocomposites show a greatly improved specific capacitance of 128 F g⁻¹, compared to that of pristine ACs (62 F g⁻¹), based on the total mass of the electrodes. The exceptional mechanical stability of the nanocomposites, which are attached on prestretched elastomer substrates, is confirmed; only a ≈15% increase in the electrical resistance is observed under a tensile strain of 100%, and the initial resistance is fully recovered after releasing. Finally, the outstanding durability and electrochemical performance of the deformable all‐carbon‐based symmetric capacitors under various mechanical deformations of bending, folding, twisting, and stretching are successfully demonstrated.

中文翻译：

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碳纳米片基大面积电化学电容器，具有柔性，可折叠，可扭曲和可拉伸的特性

随着对可穿戴电子设备的需求不断增长，开发新的兼容能源系统成为研究的重要课题。安装在可穿戴电子设备上的能源系统应具有较高的成本效率，机械坚固性和较高的电化学活性。在此，建议使用可自由变形的电化学电容器的全碳基大面积纳米复合材料来满足这些要求。三维集成的自支撑纳米复合材料由分布在直接纺丝衍生的碳纳米管（DS-CNT）片材中的活性炭（AC）组成，不含任何添加剂，包括导电剂或粘合剂。由于高度多孔的AC粒子的协同作用，CNT的高电子传输动力学以及酸处理所带来的离子易接近性，^-1，与原始ACs（62 F g ^-1）相比，基于电极的总质量。纳米复合材料具有出色的机械稳定性，该纳米复合材料附着在预拉伸的弹性体基材上；在100％的拉伸应变下，电阻仅增加了约15％的电阻，并且释放后初始电阻已完全恢复。最后，成功地证明了可变形全碳基对称电容器在弯曲，折叠，扭曲和拉伸的各种机械变形下的出色耐久性和电化学性能。