报告题目: Two-Dimensional Transition Metal Nitrides for Energy Storage and Beyond

报告人: 肖旭博士 德雷塞尔大学材料科学工程系

报告时间: 2020-01-09 10:00

报告地点: 工物馆324A

联系人：张强

报告内容：Two-dimensional (2D) transition metal nitrides are in high demand due to their promising physical and electrochemical properties. While more than 20 2D transition metal carbides, such as Ti3C2Tx and other carbide MXenes have been obtained, 2D metal nitrides are limited to only a handful of synthesized materials so far. In terms of their superior conductivity and stability, the field of 2D metal nitrides is of growing significance. The bottleneck is a lack of known synthesis routes. For example, there are few bulk layered transition metal ternary nitrides known and so far only 2D Ti4N3 and Ti2N (nitride MXene) have been successfully exfoliated from nitride MAX phases. Hence we recently developed a salt-templating method, which has already produced 2D MoN, V2N, W2N, W2N3 and Mn3N2. In this procedure, a metal-containing precursor is mixed with a salt and then treated at high temperatures under ammonia flow. A 2D metal nitride is obtained due to the lattice match between the surface of the salt and the target product. X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS) and X-ray pair distribution function (PDF) analysis confirmed the various nitrides structures. We will also discuss the potential applications of 2D metal nitrides in energy storage and beyond.