MXene 是一种类石墨烯结构的新型二维过渡金属碳化物或碳氮化物,通过氟盐和盐酸或氢氟酸刻蚀前驱体 MAX相中的活泼金属元素得到,其化学通式为 Mn+1 XnT(n=1,2,3…),T表示表面所附着的官能团(-H、-F或-OH)。得益于其表面的官能团,MXene在储能方面应用较为广泛。通过表面改性、离子插层,增加 MXene晶面间距,提高离子传输效率,以优化 MXene在电化学方面的应用。综述了以 Ti3 C2为代表的 MXene的制备方法、理论研究以及在锂离子电池、锂硫电池、超级电容器等方面的应用研究进展,展望了 MXene 在电化学领域的应用前景和未来的研究方向。
MXene is a novel two-dimensional transition metal carbides or carbonitrides with similar structure to graphene.It can be produced by etching the active metal element from the precursor MAX phase using the hydrochlo-ric acid solution of fluoride salt or hydrofluoric acid solution.The general chemical formula of MXene is Mn+1 XnT(n=1,2,3…)and T represents the groups(-H,-F or-OH)adhering on the surface.Thanks to the surface groups,MXene has relatively broad application in energy storage.The electrochemical applications of MXene can be optimized by means of surface modification,ion intercalation,increasing MXene crystalline space and improving the ion transport rate.This paper focus on the representative of MXenes,Ti3 C2 ,and reviews its preparation method,theoretical study,and the applications research progress in lithium ion battery,lithium sulfur battery and supercapacitor.The electrochemis-try development direction and application of MXene are also prospected.
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