MXene-based conductive hydrogels have emerged as a new type of soft materials in flexible electronics. Herein, metal coordination is introduced into MXene-based conductive hydrogels to synchronously enhance the mechanical and self-healing properties. MXene-based conductive hydrogels are made up of polyacrylic acid (PAA), sium carboxymethyl cellulose (SCMC), Ti3C2TX and metal ions (Ni2+, Al3+ or Sn4+). PAA/SCMC/Ti3C2TX/Sn4+ hydrogel is found to have excellent mechanical (stress: 122 kPa; strain: 1688 %; toughness: 0.95 ± 0.12 MJ m−3) and self-healing (self-healing efficiency: 99.27 % (conductivity); 81.16 % (stress); and 83.13 % (strain)) properties due to the metal coordination and H-bonding. The hydrogel has also good conductivity of 0.82 S m−1 and adhesion of 38.94 kPa. The flexible sensors based on this hydrogel can efficiently detect human motions, electromyography (EMG), electrocardiography (ECG) and handwriting signals. Furthermore, a supercapacitor assembled from this hydrogel has a high specific capacitance of 118.66 F g−1 and good stability (15000 charge-discharge cycles). This work provides an effective strategy for exploiting mechanically tough and self-healing MXene-based conductive hydrogels with prospective applications in flexible electronics.

中文翻译：

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MXene基导电水凝胶通过金属配位增强韧性和自修复能力，用于柔性电子设备


基于 MXene 的导电水凝胶已成为柔性电子产品中的一种新型软材料。在此，将金属配位引入MXene基导电水凝胶中，以同步增强机械性能和自修复性能。 MXene基导电水凝胶由聚丙烯酸（PAA）、羧甲基纤维素钠（SCMC）、Ti3C2TX和金属离子（Ni2+、Al3+或Sn4+）组成。 PAA/SCMC/Ti3C2TX/Sn4+水凝胶具有优异的机械性能（应力：122 kPa；应变：1688 %；韧性：0.95 ± 0.12 MJ m−3）和自修复（自修复效率：99.27 %（电导率）） ; 81.16 %（应力）；和 83.13 %（应变））归因于金属配位和氢键。该水凝胶还具有良好的电导率（0.82 S m−1）和粘附力（38.94 kPa）。基于这种水凝胶的柔性传感器可以有效地检测人体运动、肌电图（EMG）、心电图（ECG）和手写信号。此外，由该水凝胶组装的超级电容器具有118.66 F g−1的高比电容和良好的稳定性（15000次充放电循环）。这项工作为开发机械坚韧和自修复的 MXene 基导电水凝胶提供了一种有效的策略，并在柔性电子产品中具有潜在的应用。