Direct synthesis and chemical vapor deposition of 2D carbide and nitride MXenes
Direct synthesis and chemical vapor deposition of 2D carbide and nitride MXenes
复制标题
DOI：
10.1126/science.add9204
复制
发表时间：
2022-12
期刊：
影响因子：
56.9
通讯作者：
Di Wang;Chenkun Zhou;A. Filatov;Wooje Cho;F. Lagunas;Mingzhan Wang;Suriyanarayanan Vaikuntanathan;Chong Liu;R. Klie;D. Talapin
中科院分区：
文献类型：
--
作者：
Di Wang;Chenkun Zhou;A. Filatov;Wooje Cho;F. Lagunas;Mingzhan Wang;Suriyanarayanan Vaikuntanathan;Chong Liu;R. Klie;D. Talapin
二维过渡金属碳化物和氮化物（MXenes）是一个大家族的材料积极研究的各种应用，特别是在储能领域。MXene通常通过蚀刻层状三元化合物（称为MAX相）来合成。我们展示了一种直接合成路线，用于MXene的可扩展和原子经济性合成，包括尚未从MAX相合成的化合物，通过金属和金属卤化物与石墨，甲烷或氮气的反应。直接合成使得MXene毯状物的化学气相沉积生长和复杂的球晶样形态能够通过MXene毯状物的屈曲和释放而形成，以暴露新鲜表面用于进一步反应。直接合成的MXene显示出优异的锂离子嵌入储能能力。描述不含MAX相的MXenes二维金属碳化物和氮化物，或称MXenes，在储能和电子领域有几个潜在的应用。它们通常通过在苛刻的蚀刻步骤中分层母体化合物（MAX相）来制备。Wang等人使用化学气相沉积法合成了最广泛使用的MXene之一Ti 2CCl 2，以及MAX phase无法获得的MXene（参见Robertson和Tolbert的Perspective）。甲烷和四氯化钛在钛表面上的反应导致垂直于金属的Ti 2CCl 2片的生长。在某些生长条件下，片层可以从表面弯曲形成囊泡。-PDS固态反应在金属基底上形成2D金属碳化物和氮化物的垂直地毯。
Two-dimensional transition-metal carbides and nitrides (MXenes) are a large family of materials actively studied for various applications, especially in the field of energy storage. MXenes are commonly synthesized by etching the layered ternary compounds, called MAX phases. We demonstrate a direct synthetic route for scalable and atom-economic synthesis of MXenes, including compounds that have not been synthesized from MAX phases, by the reactions of metals and metal halides with graphite, methane, or nitrogen. The direct synthesis enables chemical vapor deposition growth of MXene carpets and complex spherulite-like morphologies that form through buckling and release of MXene carpet to expose fresh surface for further reaction. The directly synthesized MXenes showed excellent energy storage capacity for lithium-ion intercalation. Description MXenes without MAX phases Two-dimensional metal carbides and nitrides, or MXenes, have several potential applications in energy storage and electronics. They are usually made by delamination of a layered parent compound, a MAX phase, in a harsh etching step. Wang et al. synthesized one of the most widely used MXenes, Ti2CCl2, as well as MXenes not available from MAX phases, using chemical vapor deposition (see the Perspective by Robertson and Tolbert). The reaction of methane and titanium tetrachloride on a titanium surface led to the growth of Ti2CCl2 sheets perpendicular to the metal. Under some growth conditions, the sheets could buckle off the surface to form vesicles. —PDS Solid-state reactions formed vertical carpets of 2D metal carbides and nitrides on metal substrates.