Re-stacking of 2D Ti₃C₂T_X (MXene) nanosheets seriously limits their applications and development of effective strategies to overcome this issue remains challenging. Thus, an efficient method was proposed to rapidly fabricate (＜20 min) a MXene nanosheets-catalyzed self-assembled, poly-acrylic acid (PAA) hydrogel with excellent conductivity, stretchability (∼1400%), and anti-aggregation(＞60 d) properties. In the proposed strategy, in-situ growth of TiO₂ nanoparticles (NPs) on MXene surfaces could effectively overcome the nanosheets restacking in solvents. Moreover, the reductive TiO₂@MXene nanosheets not only catalyze the dissociation of the initiator generating sufficient radicals by redox reaction to initiate the ultrafast polymerization of AA monomers without heating, but also cross-link polymer chains (via chemical bonding) to produce hydrogel in a time scale of minutes instead of hours. Therefore, the MXene-catalyzed ultrafast self-assembly design effectively overcame the problem associated with the re-aggregation of nanosheets in hydrogels. More importantly, the structural, mechanical, swelling, adhesive, and conductive performances of the hydrogel could be adjusted by altering the TiO₂@MXene contents. This strategy should be extended to almost all types of MXene-radical polymerized hydrogels with tunable structures and performances that have potential applications in the field of wearable bioelectronics.

2D Ti ₃ C ₂ T _X（MXene）纳米片的重新堆叠严重限制了它们的应用，开发克服该问题的有效策略仍然具有挑战性。因此，提出了一种有效的方法来快速制备（＜20分钟）MXene纳米片催化的自组装聚丙烯酸（PAA）水凝胶，该凝胶具有优异的导电性，可拉伸性（〜1400％）和抗聚集性（＞ 60） d）属性。在提出的策略中，在MXene表面上原位生长TiO ₂纳米颗粒（NPs）可以有效克服纳米片在溶剂中的重新堆积。此外，还原性TiO ₂@MXene纳米片不仅可以通过氧化还原反应催化引发剂的解离，从而产生足够的自由基，从而在不加热的情况下引发AA单体的超快聚合，还可以在数分钟的时间内将聚合物链交联（通过化学键合）生成水凝胶小时。因此，MXene催化的超快自组装设计有效地克服了与纳米片在水凝胶中重新聚集相关的问题。更重要的是，可以通过改变TiO ₂来调节水凝胶的结构，机械，溶胀，粘合和导电性能@MXene内容。该策略应扩展到几乎所有类型的具有可调结构和性能的MXene自由基聚合水凝胶，这些凝胶在可穿戴生物电子领域具有潜在应用。