State Key Laboratory Base of Eco-Chemical Engineering, College of Chemical Engineering, Qingdao University of Science & Technology, Qingdao 266042, China.
ACS Appl Mater Interfaces. 2023 May 3;15(17):21134-21142. doi: 10.1021/acsami.3c01959. Epub 2023 Apr 25.
Three-dimensional micro-supercapacitors (3D MSCs) have accelerated the development of microenergy-storage modules for miniaturized and portable electronics. However, the low energy density, complex construction strategy, and low assembly accuracy of a 3D MSC restrict its practical application. Herein, we design a simple construction strategy for a 3D MSC with high energy density by mortise and tenon structures. Wood-derived carbon modified by nitrogen-doped carbon nanotube arrays (N-CNT-WDC) provides an ordered ion transport channel and a large active specific surface area, availing the improvement of the energy density of a 3D MSC. Its strong carbon skeleton structure supports the construction of 3D interdigital electrodes with a tenon structure by laser, realizing precise and regulable assembly of 3D MSCs through a mortise and tenon joint. The prepared 3D MSC based on N-CNT-WDC shows an excellent volumetric capacitance of 93.66 F cm, a high volumetric energy density of 12 mW h cm at 600 mA cm, and an 85% retention rate of capacitance after 10,000 cycles of charge and discharge at 1000 mA cm. Furthermore, the mortise and tenon structure realizes diversified integration of 3D MSCs, making the integrated manufacturing of 3D microdevices more convenient and promoting their application in microelectronic devices.
三维微超级电容器（3D MSCs）加速了微型化和便携式电子产品的微储能模块的发展。然而，3D MSC 的能量密度低、结构策略复杂和组装精度低限制了其实际应用。在此，我们通过榫卯结构设计了一种具有高能量密度的 3D MSC 的简单构建策略。氮掺杂碳纳米管阵列修饰的木质衍生碳（N-CNT-WDC）提供了有序的离子传输通道和大的比表面积，有利于提高 3D MSC 的能量密度。其强碳骨架结构通过激光支撑具有榫结构的三维叉指电极的构建，通过榫卯接头实现 3D MSCs 的精确和可调节组装。基于 N-CNT-WDC 的制备的 3D MSC 具有出色的体积电容为 93.66 F cm，在 600 mA cm 时具有 12 mW h cm 的高体积能量密度，在 1000 mA cm 下经过 10000 次充放电循环后电容保持率为 85%。此外，榫卯结构实现了 3D MSCs 的多样化集成，使 3D 微器件的集成制造更加方便，并促进了它们在微电子器件中的应用。
