Hollow MXene Spheres and 3D Macroporous MXene Frameworks for Na‐Ion Storage
Hollow MXene Spheres and 3D Macroporous MXene Frameworks for Na‐Ion Storage
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用于钠离子存储的中空MXene球体和3D大孔MXene框架
DOI：
10.1002/adma.201702410
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发表时间：
2017-10
影响因子：
29.4
通讯作者：
Meng-qiang Zhao;Xiuqiang Xie;Chang E. Ren;T. Makaryan;B. Anasori;Guoxiu Wang;Y. Gogotsi
中科院分区：
文献类型：
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作者：
Meng-qiang Zhao;Xiuqiang Xie;Chang E. Ren;T. Makaryan;B. Anasori;Guoxiu Wang;Y. Gogotsi
被称为MXenes的二维过渡金属碳化物和氮化物在电化学电容器、锂离子电池和钠离子电池以及锂硫电池等储能设备中越来越受到关注，并显示出具有竞争力的性能。然而，与其他2D材料类似，MXene纳米片倾向于堆叠在一起，限制了设备的性能。为了充分利用MXene的电化学储能能力，本文采用模板法将二维MXene薄片加工成空心球体和三维结构。MXene空心球稳定，易于在水和乙醇等溶剂中分散，在环境和生物医学领域也具有潜在的应用前景。由于球体之间良好的接触和MXenes的金属导电性，3D大孔MXene薄膜具有独立、柔性和高导电性。当用作钠离子存储的阳极时，与多层MXene和MXene/碳纳米管混合结构相比，这些3D MXene薄膜在容量、速率能力和循环稳定性方面表现出更高的性能。这项工作证明了MXene电极结构对电化学性能的重要性，并可以指导未来设计用于储能，催化，环境和生物医学应用的高性能MXene基材料。
2D transition metal carbides and nitrides, named MXenes, are attracting increasing attentions and showing competitive performance in energy storage devices including electrochemical capacitors, lithium‐ and sodium‐ion batteries, and lithium–sulfur batteries. However, similar to other 2D materials, MXene nanosheets are inclined to stack together, limiting the device performance. In order to fully utilize MXenes' electrochemical energy storage capability, here, processing of 2D MXene flakes into hollow spheres and 3D architectures via a template method is reported. The MXene hollow spheres are stable and can be easily dispersed in solvents such as water and ethanol, demonstrating their potential applications in environmental and biomedical fields as well. The 3D macroporous MXene films are free‐standing, flexible, and highly conductive due to good contacts between spheres and metallic conductivity of MXenes. When used as anodes for sodium‐ion storage, these 3D MXene films exhibit much improved performances compared to multilayer MXenes and MXene/carbon nanotube hybrid architectures in terms of capacity, rate capability, and cycling stability. This work demonstrates the importance of MXene electrode architecture on the electrochemical performance and can guide future work on designing high‐performance MXene‐based materials for energy storage, catalysis, environmental, and biomedical applications.