MXenes公司
最大相位
材料科学
氮化物
碳化物
纳米技术
纳米尺度
相(物质)
陶瓷
化学工程
电化学
纳米纤维
三元运算
电极
复合材料
图层(电子)
化学
有机化学
程序设计语言
物理化学
工程类
计算机科学
作者
Hui Shao,Sha Luo,Armel Descamps‐Mandine,Kangkang Ge,Zifeng Lin,Pierre‐Louis Taberna,Yury Gogotsi,Patrice Simon
标识
DOI:10.1002/advs.202205509
摘要
Layered ternary carbides and nitrides, also known as MAX phases, have attracted enormous attention for many applications, especially as precursors to produce 2D metal carbides and nitrides called MXenes. However, it is still challenging to tune and control the shape/morphology of MAX phase particles at the nanoscale, as they are typically manufactured as large grains using ceramic technology. Herein, nanostructured Ti-Al-C MAX phases with fine-tuned morphology of nanofibers and nanoflakes are prepared by using 1D and 2D carbon precursors at a synthesis temperature of 900 °C. The nanostructured MAX phases are used as precursors to produce nanosized multilayered MXenes, with a considerably shorter etching time and a low reaction temperature. These nanosized MXenes exhibit good electrochemical lithium-ion storage properties and a pseudocapacitive electrochemical signature. The obtained Ti2 CTx MXene electrode can deliver delithiation capacity of 300 mAh g-1 at low rates and 100 mAh g-1 when the lithiation/delithiation cycle happens within 30 s. Availability of nanoscale MAX phases and MXene nanoflakes with small lateral size may open new opportunities for both classes of materials.
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