MXenes公司
材料科学
电极
锂(药物)
超级电容器
化学工程
电化学
碳纤维
纳米技术
过渡金属
氮化物
复合数
无机化学
图层(电子)
复合材料
化学
催化作用
物理化学
内分泌学
工程类
医学
生物化学
作者
Lu Lu,Guozhen Guan,Jing Wang,Weixue Meng,Shiqi Li,Yingjiu Zhang,Fengmei Guo
标识
DOI:10.1016/j.cej.2023.147999
摘要
Two-dimensional transition metal carbides/nitrides or MXenes, show great promising in energy storage field owing to its excellent electrical and chemical properties, especially for the modifiable surface functional groups, adjustable interlayer spacing and metal-like conductivity. Here, a hybrid electrode based on double transition metal MXene (Ti2NbC2Tx) is designed and synthesized, where nitrogen-doped carbon dots are uniformly anchored on the edge-crumpled Ti2NbC2Tx nanosheets. The unique structure of the hybrid electrode can effectively suppress the self-stacking of MXenes nanosheets, improve the ions/electron transport efficiency and the cycling stability. The Ti2NbC2Tx@CDs hybrid electrode achieves outstanding rate capability and cycling performance for both lithium-ion batteries (LIBs) and sodium-ion batteries (SIBs). At 5 A g−1, up to 10,000 cycles, it can deliver 217.3 mAh g−1 for LIBs and 109.2 mAh g−1 for SIBs. The Ti2NbC2Tx@CDs hybrids show high capacitive contribution, owing to the rapid ions/electrons transporting. The Ti2NbC2Tx@CDs hybrids also show ideal electrochemical reversibility from the in-situ XRD study. This work will help to develop novel double transition metal MXenes and their composite electrode materials for LIBs/SIBs with better performance.
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