Abstract：
MXenes have attracted growing interest in electrochemical energy storage owing to their high electronic conductivity and editable surface chemistry. Besides, rendering MXenes with spectrum defense properties further broadens their versatile applications. However, the development of MXenes suffers from weak van der Waal interaction-driven self-restacking that leads to random alignment and inferior interface microenvironments. Herein, a nacre-inspired MXene film is tailored by dual-filling of 2-ureido-4[1H]-pyrimidinone (UPy)-modified polyvinyl alcohol (PVA-UPy) and carbon nanotubes (CNTs). The dual-nanofillers engineering endows the nanocomposite film with a highly ordered structure (a Herman\'s order value of 0.838), a high mechanical strength (139.5 MPa), and continuous conductive pathways of both the ab plane and c-axis. As a proof-of-concept, the tailored nanocomposite film achieves a considerable capacitance of 508.2 F cm-3 and long-term cycling stability without performance degradation for 10 000 cycles. It is efficient for spectra defense in radar and infrared bands, displaying a high electromagnetic shielding capacity (19186 dB cm2 g-1) and a super-low infrared (IR) emissivity (0.16), with negligible performance decay after saving in the air for 1 year, responsible for the applications in specific and complex conditions. This interfacial dual-filler engineering concept showcases effective nanotechnology toward sustainable energy applications with a long lifetime and safety.
摘要：
MXene由于其高电子电导率和可编辑的表面化学性质而吸引了对电化学储能的日益增长的兴趣。此外,渲染MXenes具有光谱防御特性，进一步拓宽了其通用应用。然而,MXenes的发展受到范德华相互作用驱动的自重堆的影响，导致随机对齐和较差的界面微环境。在这里，由2-脲基-4[1H]-嘧啶酮（UPy）改性的聚乙烯醇（PVA-UPy）和碳纳米管（CNT）的双重填充来定制珍珠质启发的MXene膜。双纳米填料工程赋予纳米复合薄膜高度有序的结构（Herman的有序值为0.838），高机械强度（139.5MPa），以及ab平面和c轴的连续导电通路。作为一个概念证明,定制的纳米复合材料薄膜实现了508.2Fcm-3的相当大的电容和长期循环稳定性，而没有性能下降10.000次循环。对于雷达和红外波段的光谱防御是有效的，显示高电磁屏蔽能力（19186dBcm2g-1）和超低红外（IR）发射率（0.16），在空气中保存1年后，性能衰减可以忽略不计，负责在特定和复杂条件下的应用。这种界面双填料工程概念展示了有效的纳米技术，以长寿命和安全性实现可持续能源应用。
