Ti₃C₂T_x (MXene), a thriving member of the two-dimensional (2D) materials family, has shown increasing potential in a myriad of applications, ranging from printable electronics to energy storage and separation membranes. Nevertheless, the dilemma of its oxidative instability and the easy disintegration of its assemblies in contact with water has been restricting its real-life use. Here, we report the benefits of tartaric acid, a natural source, as a non-innocent additive in the MXene composite. In water, it can, above all, inhibit oxidation of Ti₃C₂T_x and hold individual components in the composite Ti₃C₂T_x/poly(3,4-ethylenedioxy thiophene):polystyrene sulfonate) (Ti₃C₂T_x/PEDOT:PSS) firmly together; equally important, it can boost 4-fold the composite’s electron conductivity in comparison to the additive-free equivalent. To showcase its practical value, a tartaric-acid-treated, water-stable MXene/PEDOT:PSS conductive coating is made, which serves as electrodes for an ultrafast supercapacitor; among all 2D materials-based assemblies, the designed supercapacitor delivers, to our knowledge, the record-high performance in an alternating-current filtering application.

Ti ₃ C ₂ T _x (MXene) 是二维 (2D) 材料家族中的一个蓬勃发展的成员，在从可印刷电子产品到能量存储和分离膜的无数应用中显示出越来越大的潜力。然而，其氧化不稳定性和其组件与水接触时容易分解的困境一直限制了其实际应用。在这里，我们报告了天然来源酒石酸作为 MXene 复合材料中的非无辜添加剂的好处。在水中，它首先可以抑制 Ti ₃ C ₂ T _{x 的}氧化并保持复合 Ti ₃ C ₂ T _x中的各个组分/聚(3,4-亚乙基二氧基噻吩):聚苯乙烯磺酸盐)(Ti ₃ C ₂ T _x /PEDOT:PSS)牢固地结合在一起；同样重要的是，与无添加剂的等效物相比，它可以将复合材料的电子电导率提高 4 倍。为了展示其实用价值，我们制作了一种经过酒石酸处理的、水稳定的 MXene/PEDOT:PSS 导电涂层，用作超快超级电容器的电极；在所有基于 2D 材料的组件中，设计的超级电容器在交流滤波应用中提供了创纪录的高性能。