Metal Ion-Induced Assembly of MXene Aerogels via Biomimetic Microtextures for Electromagnetic Interference Shielding, Capacitive Deionization, and Microsupercapacitors
Metal Ion-Induced Assembly of MXene Aerogels via Biomimetic Microtextures for Electromagnetic Interference Shielding, Capacitive Deionization, and Microsupercapacitors
复制标题
DOI：
10.1002/aenm.202101494
复制
发表时间：
2021-07-16
影响因子：
27.8
通讯作者：
Chen, Po-Yen
中科院分区：
文献类型：
--
作者：
Ding, Meng;Li, Shuo;Chen, Po-Yen
将MXene纳米片的协同特性扩展到微孔气凝胶结构需要有效的策略来克服纳米片的重新堆积，而不影响MXene的优势特性。3D MXene气凝胶的传统组装方法通常涉及外部粘合剂/模板和/或额外的功能化，这牺牲了MXene气凝胶的电导率和电化学活性。在这里，受Phrynosoma cornutum的分层尺度结构的启发，设计了一个皱褶结构的Ti3C2Tx MXene平台，以促进Mg2+诱导组装，使大面积的Mg2+-MXene气凝胶在没有聚合物粘合剂的情况下形成适形。通过医生叶片技术和冷冻干燥，生产出具有定制形状/尺寸的Mg2+-MXene气凝胶，具有高表面积(140.5 m(2) g(-1))，优越的电导率（758.4 S m(-1)）和高水中坚固性。高导电性的MXene气凝胶显示了其从宏观技术（例如电磁干扰屏蔽和电容去离子（CDI））到片上电子（例如准固态微超级电容器（QMSCs））的广泛应用。作为CDI电极，Mg2+-MXene气凝胶具有较高的盐吸附能力（33.3 mg g(-1)）和长期运行可靠性（超过30次循环），与文献显示了极好的对比。此外，与其他先进的QMSCs相比，具有交叉指状Mg2+-MXene气凝胶电极的QMSCs具有高的面电容（409.3 mF cm(-2)），具有优越的功率密度和能量密度。
Scaling the synergistic properties of MXene nanosheets to microporous aerogel architectures requires effective strategies to overcome the nanosheet restacking without compromising MXene's advantageous properties. Traditional assembly approaches of 3D MXene aerogels normally involve external binders/templates and/or additional functionalization, which sacrifice the electrical conductivities and electrochemical activities of MXene aerogels. Herein, inspired by the hierarchal scale textures of Phrynosoma cornutum, a crumple-textured Ti3C2Tx MXene platform is engineered to facilitate Mg2+-induced assembly, enabling conformal formation of large-area Mg2+-MXene aerogels without polymeric binders. Through a doctor blading technique and freeze drying, the Mg2+-MXene aerogels are produced with customized shapes/dimensions, featuring high surface area (140.5 m(2) g(-1)), superior electrical conductivity (758.4 S m(-1)), and high robustness in water. The highly conductive MXene aerogels show their versatile applications from macroscale technologies (e.g., electromagnetic interference shielding and capacitive deionization (CDI)) to on-chip electronics (e.g., quasi-solid-state microsupercapacitors (QMSCs)). As CDI electrodes, the Mg2+-MXene aerogels exhibit high salt adsorption capacity (33.3 mg g(-1)) and long-term operation reliability (over 30 cycles), showing a superb comparison with the literature. Also, the QMSCs with interdigitated Mg2+-MXene aerogel electrodes demonstrate high areal capacitances (409.3 mF cm(-2)) with superior power density and energy density compared with other state-of-art QMSCs.