The cobalt ion chelated Ti₃C₂T_x MXene (Co@Ti₃C₂T_x MXene) composite is designed/prepared by alkalizing quasi-monolayer Ti₃C₂T_x MXene supernatant into -OH rich sample, followed by cobalt ion chelation, to achieve the high loading amount of Co element. The optimized Co@Ti₃C₂T_x MXene can display the high specific capacity of 48 mAh/g at the current density of 1 A/g, much higher than Ti₃C₂T_x MXene, which is attributed to the highly dispersed quasi-monolayer structure, additional Faradaic redox reaction of Co (Ⅱ/Ш), and enhanced conductivity from Co element. In terms of practical application, the assembled Co@Ti₃C₂T_x MXene//active carbon (AC) asymmetric supercapacitor device also exhibits the high energy density of 19 Wh/kg, and good cycle stability. The alkali modification/metal ion chelation is a simple and effective strategy to inhibit the stack and enhance electrochemical performances for Ti₃C₂T_x MXene.

钴离子螯合 Ti ₃ C ₂ T _x MXene (Co@Ti ₃ C ₂ T _x MXene) 复合材料是通过将准单层 Ti ₃ C ₂ T _x MXene 上清液碱化为富含-OH 的样品，然后加入钴离子来设计/制备的螯合，实现Co元素的高负载量。优化后的Co@Ti ₃ C ₂ T _x MXene在1 A/g电流密度下可显示出48 mAh/g的高比容量，远高于Ti ₃ C ₂ T _xMXene，这归因于高度分散的准单层结构、Co (Ⅱ/Ш) 的额外法拉第氧化还原反应以及 Co 元素增强的导电性。在实际应用方面，组装的Co@Ti ₃ C ₂ T _x MXene//活性炭（AC）非对称超级电容器装置也表现出19 Wh/kg的高能量密度和良好的循环稳定性。_{碱改性/金属离子螯合是一种简单有效的策略，可以抑制 Ti 3} C ₂ T _x MXene的堆叠并提高其电化学性能。