CIESC Journal ›› 2022, Vol. 73 ›› Issue (2): 951-959.DOI: 10.11949/0438-1157.20210549

• Material science and engineering, nanotechnology • Previous Articles     Next Articles

One-step synthesis of two-dimensional Ti3C2 and its electrochemical performance

Tao JU1(),Guohui LI2(),Fengxia GENG1   

  1. 1.College of Energy, Soochow University, Suzhou 215123, Jiangsu, China
    2.School of Chemistry and Chemical Engineering, Zunyi Normal University, Zunyi 563006, Guizhou, China
  • Received:2021-08-19 Revised:2021-11-01 Online:2022-02-18 Published:2022-02-05
  • Contact: Guohui LI

一步法合成二维Ti3C2及其电化学性能研究

居涛1(),李国辉2(),耿凤霞1   

  1. 1.苏州大学能源学院,江苏 苏州 215123
    2.遵义师范学院化学化工学院,贵州 遵义 563006
  • 通讯作者: 李国辉
  • 作者简介:居涛(1995—),男,硕士研究生,jutao688@163.com
  • 基金资助:
    国家自然科学基金项目(51772201);贵州省材料电化学特色重点实验室项目(黔教合KY字[2018]004);博士基金(遵师BS[2020]13)

Abstract:

Two-dimensional transition metal carbides and carbonitrides (MXenes) are the latest additions of the 2D world, which can be obtained by selective etching the a atomic layers from layered MAX precursors. In the traditional method of preparing MXene, the commonly used etchant is hydrofluoric acid. However, the use of concentrated hydrofluoric acid may inevitably bring about safety problems and even the destruction of crystal structure, resulting in the deterioration of intrinsic physical and chemical properties. This article starts from the typical carbide precursor Ti3AlC2 and uses NH4BF4 as an etchant to effectively reduce the amount of acid used in the system. More importantly, during the reaction process, the A layers were etched accompanied by intercalation of NH4+, by which the interlayer spacing was expanded and interlayer interaction was greatly weakened. High exfoliation efficiency of 2D Ti3C2 with intact crystallinities exfoliation was realized by a sequent hand shaking process. The electrochemical performance of as-obtained Ti3C2 was further characterized, showing an excellent capacitive electrochemical performance (503 F?g-1 at a scan rate of 5 mV?s-1) and cycling stability (the capacitance retention rate is 95.8% at 5 A·g-1 after 104 cycles). This provides new ideas for the synthesis and application of Ti3C2 nanosheets.

Key words: hydrothermal, nanomaterials, synthesis, Ti3C2 nanosheets, electrochemistry, MXene

摘要:

二维过渡金属碳/氮化物(MXene)是一种新型二维材料,可通过从MAX相前体中选择性刻蚀 A 原子层获得。在传统制备MXene的方法中,常用的刻蚀剂是氢氟酸。然而高浓度氢氟酸的使用,不可避免会带来安全问题,甚至破坏MXene的晶体结构,从而限制本征物理化学性能。从典型的碳化物前体Ti3AlC2出发,使用 NH4BF4作为刻蚀剂,有效降低体系中酸的使用量;在反应过程中,刻蚀 A 层的同时,NH4+进入堆垛层间,扩大层间距,弱化层间作用力。因此,仅通过简单手摇就可以实现高效剥离,得到具有完整晶体结构的二维Ti3C2。进一步测试了Ti3C2的电化学性能,结果显示,所得的Ti3C2具有优异的性能(扫描速率为5 mV?s-1时为503 F?g-1)和循环稳定性(在5 A?g-1下循环104次后电容保持率为95.8%)。本文为Ti3C2纳米片的合成及应用提供了新的思路。

关键词: 水热, 纳米材料, 合成, Ti3C2纳米片, 电化学, MXene

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