MXenes公司
蚀刻(微加工)
碱金属
插层(化学)
材料科学
无机化学
电化学
水热合成
热液循环
氢氟酸
核化学
化学
纳米技术
化学工程
图层(电子)
物理化学
电极
有机化学
工程类
作者
Yali Guo,Xin Zhang,Sheng Jin,Qi Xia,Yukai Chang,Libo Wang,Aiguo Zhou
标识
DOI:10.26599/jac.2023.9220795
摘要
Two-dimensional MXenes are generally prepared by the etching of acid solutions. The as-synthesized MXenes are terminated by acid group anions (F–, Cl–, et al.), which affect the electrochemical performance of MXenes. Here, we report a novel method to prepare Mo2C MXene from Mo2Ga2C by the hydrothermal etching of alkali solutions. Highly pure Mo2C MXene was successfully synthesized by the etching of NaOH, while the etchings of LiOH and KOH were failed. The concentration of NaOH, temperature and time strongly affect the purity of as-prepared MXene. Pure Mo2C MXene could be synthesized by the etching of 20 M NaOH at 180 °C for 24 h. After intercalation by hexadecyl trimethyl ammonium bromide at 90 °C for 96 h, few-layer Mo2C MXene was obtained. The Mo2C MXene made by NaOH etching after intercalation exhibited excellent performance as anode of lithium-ion battery, compared with general Mo2C MXene made by HF etching and the Mo2C MXene reported in literature. The final discharge specific capacity was 266.73 mAh·g-1 at 0.8 A·g-1, which is 52% higher than that Mo2C made by HF etching (175.77 mAh·g-1). This is because Mo2C MXene made by NaOH etching has lager specific surface area, lower resistance, and pure O/OH termination without acid anion termination. This is the first report to make Mo2C MXene by alkali etching and the samples made by this method exhibited significantly better electrochemical performance than the samples made by general HF etching.
科研通智能强力驱动
Strongly Powered by AbleSci AI