您的位置>>首页 > 科学研究 > 研究动态 > 阅读正文
科学研究Infomation
物理学院庆祝吉林大学建校70周年系列学术活动(十二)

题目:Two-Dimensional Carbides and Nitrides MXenes and Their Applications in Energy Storage

时间:2016年6月16日 下午1:30-3:30

地点:物理楼333报告厅

报告人:Yury Gogotsi

    Associate Editor, ACS Nano

    Distinguished University Professor and Trustee Chair of Materials Science and Engineering at Drexel University,

    Founding Director of the A.J. Drexel Nanomaterials Institute

    中组部"外专千人"专家

简介:

   Two-dimensional (2D) solids – the thinnest materials available to us – offer unique properties and a potential path to device miniaturization. The most famous example is graphene, which is an atomically thin layer of carbon atoms bonded together in-plane with sp2 bonds. In 2011, an entirely new family of 2D solids – transition metal carbides (Ti2C, Ti3C2, Nb4C3, etc.) and carbonitrides – was discovered by Drexel University scientists [1]. Selective etching of the A-group element from a MAX phase results in formation of 2D Mn+1Xn solids, labeled “MXene”. 17 different carbides and carbonitrides have been reported to date [2-5]. A new sub-family of multi-element ordered MXenes was discovered recently [2]. Structure and properties of numerous MXenes have been predicted by the density functional theory, showing that MXenes can be metallic or semiconducting, depending on their surface termination. Their elastic constants along the basal plane are expected to be higher than that of the binary carbides. Oxygen or OH terminated MXenes, are hydrophilic, but electrically conductive. Hydrazine, urea and other polar organic molecules can intercalate MXenes leading to an increase of their c lattice parameter [3]. When dimethyl sulfoxide or TBAOH was intercalated into Ti3C2, followed by sonication in water, a stable colloidal solution of single- and few-layer flakes was produced. One of the many potential applications for 2D Ti3C2 is in electrical energy storage devices such as batteries, Li-ion capacitors and supercapacitors [3-5]. Cations ranging from Na+ to Mg2+ and Al3+ intercalate MXenes. Ti3C2 paper electrodes, produced by vacuum assisted filtration of an aqueous dispersion of delaminated Ti3C2, show a higher capacity than graphite anodes and also can be charged/discharged at significantly higher rates. They also demonstrate very high intercalation capacitance (up to 900 F/cm3) in aqueous electrolytes [4].

1.M. Naguib, et al, Advanced Materials, 23 (37), 4207-4331 (2011)

2.B. Anasori, et al, ACS Nano, 9 (10) 9507–9516 (2015)

3.O. Mashtalir, et al, Nature Communication, 4, 1716 (2013)

4.M M. Ghidiu, Nature, 516, 78–81 (2014)

5.M. Naguib, Y. Gogotsi, Accounts of Chemical Research, 48 (1), 128-135 (2015)

版权所有:吉林大学物理学院 © 2017 电话:0431-85166112 邮箱:wlxy@jlu.edu.cn
地址:吉林省长春市前进大街2699号 邮编:130012  旧版网站