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物理学院学术报告
发表于: 2017-03-09 10:33  点击:

报告题目:Ultrahigh Rate Energy Storage Using Two-dimensional Transition Metal Carbides (MXenes)

报告人:Prof.Yury Gogotsi

            吉林大学物理学院“外专千人”

            ACS Nano副主编

报告时间:2017年3月9日14:00

报告地点:无机超分子楼圆形报告厅1楼

 

Two-dimensional (2D) solids 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, a new family of 2D solids – transition metal carbides and nitrides (Ti2C, Ti3C2, Nb4C3, Ti4N3, etc.) – was discovered by Drexel University scientists [1]. These 2D solids with a composition Mn+1Xn (M is a transition metal, X is C or N) were labeled “MXenes”. More than 20 different carbides, nitrides and carbonitrides have been reported to date [2-5]. 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 composition and 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]. 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]. Metallic MXenes have a potential for use in electromagnetic interference (EMI) shielding, transparent conducting coatings and many other applications [5,6]. MXenes can operate at the rates exceeding those of conventional double-layer supercapacitors, but still provide higher volumetric and areal capacitance than carbons, conducting polymers or transition metal oxides. A macroporous Ti3C2Tx MXene film delivered 210 Fg-1 at scan rates of 10 Vs-1 and 100 Fg-1 at 40 Vs-1, surpassing the best carbon supercapacitors known. Moreover, we show that MXene hydrogels are able to deliver volumetric capacitance of ~1500 Fcm-3.

1.       M. Naguib, et al, Advanced Materials23 (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.       B. Anasori, M. R. Lukatskaya, Y. Gogotsi, Nature Reviews Materials, 2, 16098 (2017)

F. Shahzad, et al, Science 353, 1137-1140 (2016)

Yury Gogotsi is “1000 Talents Plan” High –level overseas expert from Jilin University.He is the Distinguished University Professor and Trustee Chair of Materials Science and Engineering at Drexel University. He is the founding Director of the A.J. Drexel Nanomaterials Institute and Associate Editor of ACS Nano. He works on nanostructured carbons and two-dimensional carbides for energy related and biomedical applications. His work on selective extraction synthesis of carbon and carbide nanomaterials with tunable structure and porosity had a strong impact on the field of capacitive energy storage. He has co-authored 2 books, more than 450 journal papers and obtained more than 50 patents. He has received numerous national and international awards for his research. He was recognized as Highly Cited Researcher by Thomson-Reuters in 2014-2016, and elected a Fellow of AAAS, MRS, ECS, RSC, ACerS and the World Academy of Ceramics.

主办单位:吉林大学新型电池物理与技术教育部重点实验室

                    吉林大学化学学院

 

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