Ghazaly Ahmed El, Ahmed Heba, Rezk Amgad R, Halim Joseph, Persson Per O Å, Yeo Leslie Y, Rosen Johanna
Department of Physics, Chemistry, and Biology (IFM) Linköping University, SE-581 83 Linköping, Sweden.
Micro/Nanophysics Research Laboratory, RMIT University, Melbourne, Victoria 3000, Australia.
ACS Nano. 2021 Mar 23;15(3):4287-4293. doi: 10.1021/acsnano.0c07242. Epub 2021 Feb 26.
The current quest for two-dimensional transition metal carbides and nitrides (MXenes) has been to circumvent the slow, hazardous, and laborious multistep synthesis procedures associated with conventional chemical MAX phase exfoliation. Here, we demonstrate a one-step synthesis method with local TiAlC MAX to TiCT MXene conversion on the order of milliseconds, facilitated by proton production through solution dissociation under megahertz frequency acoustic excitation. These protons combined with fluorine ions from LiF to selectively etch the MAX phase into MXene, whose delamination is aided by the acoustic forcing. These results have important implications for the future applicability of MXenes, which crucially depend on the development of more efficient synthesis procedures. For proof-of-concept, we show that flexible electrodes fabricated by this method exhibit comparable electrochemical performance to that previously reported.
目前对二维过渡金属碳化物和氮化物（MXenes）的探索旨在规避与传统化学MAX相剥离相关的缓慢、危险且费力的多步合成程序。在此，我们展示了一种一步合成方法，通过在兆赫兹频率声激发下溶液解离产生质子，促使局部TiAlC MAX在毫秒级转化为TiCT MXene。这些质子与LiF中的氟离子结合，选择性地将MAX相蚀刻成MXene，其分层受到声驱动力的辅助。这些结果对MXenes的未来适用性具有重要意义，而MXenes的未来适用性关键取决于更高效合成程序的发展。为了进行概念验证，我们表明通过这种方法制造的柔性电极表现出与先前报道相当的电化学性能。
