MoSe₂ presents a prospect in sodium-ion capacitors (SICs) and lithium-ion capacitors (LICs), which are considered as promising new energy systems because they possess the merits of both batteries and supercapacitors. In this work, we develop a flexible and free-standing MoSe₂/MXene film with sandwich structure as an anode for SICs and LICs. The highly conductive MXene sheets can boost the electrochemical activity of MoSe₂ nanoparticles. Meanwhile, the MoSe₂ nanoparticles can also enlarge the interlayer spacing of MXene film, facilitating the permeation of electrolyte and eventually leading to fast reaction kinetics of MoSe₂. The sandwich structure can effectively limit the loss of intermediate products generated during the insertion/extraction reactions of MoSe₂, giving rise to a durable cycle performance. The MoSe₂/MXene film with an optimized mass ratio exhibits much improved Li/Na storage performances as compared with the pristine MoSe₂, particular the long term cyclic stability. SICs and LICs could deliver high energy/power densities (Max 110.1 Wh kg⁻¹/4764.7 W kg⁻¹ and 84.9 Wh kg⁻¹/3288.3 W kg⁻¹, respectively), as well as long lifespans, demonstrating the prospective of such MXene/MoSe₂ film electrode towards alkali metal ion capacitors. Assembled flexible SICs/LICs prototypes further prove the potential application for the future flexible energy storage devices.

MoSe ₂在钠离子电容器（SIC）和锂离子电容器（LIC）中具有广阔的前景，因为它们具有电池和超级电容器的优点，因此被认为是有前途的新能源系统。在这项工作中，我们开发了一种具有三明治结构的柔性自支撑MoSe ₂ / MXene薄膜，作为SIC和LIC的阳极。高导电性MXene片可以增强MoSe ₂纳米颗粒的电化学活性。同时，MoSe ₂纳米粒子还可以扩大MXene膜的层间距，促进电解质的渗透并最终导致MoSe _2的快速反应动力学。。夹层结构可以有效地限制在MoSe ₂的插入/萃取反应期间产生的中间产物的损失，从而产生持久的循环性能。与原始的MoSe ₂相比，具有最佳质量比的MoSe ₂ / MXene薄膜具有大大提高的Li / Na储存性能，特别是长期循环稳定性。SIC和LIC可以提供高能量/功率密度（分别最大110.1 Wh kg ^-1 /4764.7 W kg ^-1和84.9 Wh kg ^-1 /3288.3 W kg ^-1），并且使用寿命长，这表明了这种潜力MXene / MoSe ₂薄膜电极朝向碱金属离子电容器。组装好的柔性SIC / LIC原型进一步证明了未来柔性储能设备的潜在应用。