Very recently, 2D MXene has attracted a lot of attention in energy storage, due to its large specific surface area, good hydrophilicity, well conductivity and adjustable composition. Herein, we reported a kind of highly‐healable microsupercapacitors (MSCs) based on size‐dependent Ti3C2Tx MXene. Due to the rich physicochemical properties of Ti3C2Tx, the MSCs were fabricated by firstly spraying different lateral size MXene nanosheets onto the cellulose paper, and then selectively engraving interdigital electrodes by laser engraving machine. The flexible MXene‐based MSCs were assembled by sulfuric acid‐polyvinyl alcohol electrolyte. It is observed the electrochemical performance of MXene‐based MSCs is significantly affected by the nanosheet size. And the capacitance of MSCs fabricated by smaller lateral nanosheet reached up to 73.6 mF/cm2, which is higher than that of the larger lateral nanosheet and mixture one that contains smaller and larger nanosheets (1:1 mass ratio). Moreover, the self‐healable MXene‐based MSCs fabricated with polyurethane containing large number of hydrogen bonds as the wrapped material, present an excellent self‐healable ability with capacitance retention of 90% over 2000 charge/discharge cycles after 5th cutting/healing. And MXene‐based MSCs display great potential in the field of energy storage, which not only turn on the LED light but also drive the electronic clock.

中文翻译：

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具有尺寸依赖性2D MXene的高修复性微型超级电容器

最近，二维MXene由于其大的比表面积，良好的亲水性，良好的电导率和可调节的组成，在能量存储方面引起了很多关注。在本文中，我们报告了一种基于尺寸依赖性Ti3C2Tx MXene的高度可修复的微型超级电容器（MSC）。由于Ti3C2Tx具有很强的理化特性，因此首先将横向尺寸不同的MXene纳米片喷涂到纤维素纸上，然后通过激光雕刻机选择性地雕刻叉指电极，从而制成了MSC。灵活的基于MXene的MSC通过硫酸-聚乙烯醇电解质组装而成。观察到基于MXene的MSC的电化学性能受纳米片尺寸的影响很大。由较小的横向纳米片制造的MSC的电容达到73.6 mF / cm2，它比较大的横向纳米片和包含较小和较大纳米片（1：1质量比）的混合物更高。此外，以聚氨酯制成的可自我修复的基于MXene的MSC包含大量氢键作为包裹材料，在第五次切割/修复后的2000个充电/放电循环中，具有出色的自我修复能力，电容保持90％。基于MXene的MSC在储能领域显示出巨大的潜力，不仅打开LED灯，而且还驱动电子时钟。在5次切割/修复后的2000个充电/放电循环中，具有出色的自修复能力，在90个充电/放电循环中保持90％的电容。基于MXene的MSC在储能领域显示出巨大的潜力，不仅打开LED灯，而且还驱动电子时钟。在5次切割/修复后的2000个充电/放电循环中，具有出色的自修复能力，在90个充电/放电循环中保持90％的电容。基于MXene的MSC在储能领域显示出巨大的潜力，不仅打开LED灯，而且还驱动电子时钟。