文献类型：期刊文献

英文题名：Synthesis and Charge Storage Properties of Hierarchical Niobium Pentoxide/Carbon/Niobium Carbide (MXene) Hybrid Materials

作者：Zhang, Chuanfang[1,2,3,6];Beidaghi, Majid[1,2,7];Naguib, Michael[1,2,8];Lukatskaya, Maria R.[1,2,9];Zhao, Meng-Qiang[1,2];Dyatkin, Boris[1,2,10];Cook, Kevin M.[1,2,11];Kim, Seon Joon[1,2,12];Eng, Brandon[1,2];Xiao, Xu[4];Long, Donghui[3];Qiao, Wenming[3];Dunn, Bruce[5];Gogotsi, Yury[1,2]

机构：[1]Drexel Univ, Dept Mat Sci & Engn, Philadelphia, PA 19104 USA;[2]Drexel Univ, AJ Drexel Nanomat Inst, Philadelphia, PA 19104 USA;[3]E China Univ Sci & Technol, State Key Lab Chem Engn, Shanghai 200237, Peoples R China;[4]Huazhong Univ Sci & Technol, Wuhan Natl Lab Optoelect, Sch Opt & Elect Informat, Wuhan 430074, Peoples R China;[5]Univ Calif Los Angeles, Dept Mat Sci & Engn, Los Angeles, CA 90095 USA;[6]Trinity Coll Dublin, Sch Chem, CRANN, Dublin 2, Ireland;[7]Auburn Univ, Wilmore Labs 275, Auburn, AL 36849 USA;[8]Oak Ridge Natl Lab, Mat Sci & Technol Div, Oak Ridge, TN 37831 USA;[9]Stanford Univ, Dept Chem Engn, Stanford, CA 94305 USA;[10]US Naval Res Lab, 4555 Overlook Ave SW, Washington, DC 20375 USA;[11]Naval Air Syst Command, Mat Engn Div, Patuxent River, MD 20670 USA;[12]Korea Adv Inst Sci & Technol, Dept Chem & Biomol Engn BK21 Plus, 291 Daehak Ro, Taejon 305701, South Korea

年份：2016

卷号：28

期号：11

起止页码：3937

外文期刊名：CHEMISTRY OF MATERIALS

收录：;EI(收录号：20162502529354);WOS:【SCI-EXPANDED(收录号:WOS:000378016400046)】；

基金：The work reported in this study was performed at Drexel University and University of California, Los Angeles. The authors greatly appreciate the support from the U.S. Department of Energy, Office of Electricity, Delivery and Energy Reliability, Energy Storage Systems Program, through Sandia National Laboratory. C.F.Z. was supported by the Chinese Scholarship Council (CSC, No. 201206740035). Electron microscopy, XPS, and XRD analyses were carried out at the Drexel University Core Facilities.

语种：英文

外文关键词：Capacitance - Carbon - Carbon dioxide - Electrolytes - Electrodes - Metal nanoparticles - Transition metals - Electric discharges - Carbides - Crystallite size - Niobium oxide - Charge transfer - Storage (materials)

摘要：Orthorhombic niobium pentoxide (T-Nb2O5) offers high capacitance and fast charging-discharging rate capabilities when used as an electrode material for Li-ion capacitors. A homogeneous distribution of T-Nb2O5 nano particles in a highly conductive matrix represents a promising approach to maximize its energy and power densities. Here we report a one-step CO2 oxidation of two-dimensional (2D) Nb2CTx, a member of the MXenes family of 2D transition metal carbides, which leads to a hierarchical hybrid material with T-Nb2O5 nanoparticles uniformly supported on the surface of Nb2CTx sheets with disordered carbon. The oxidation temperature, duration, and CO2 flow rate determine the T-Nb2O5 crystallite size as well as the structure, composition, and the charge storage properties of the hybrid material. Fifty micrometer thick electrodes of the hybrid material exhibit high capacitance (330 C g(-1) and 660 mF cm(-2) at a charge-discharge time of 4 min) and good cycling performance in a nonaqueous lithium electrolyte. The charge storage kinetics are dominated by a surface-controlled process. The observed electrochemical performance is attributed to the intrinsic pseudocapacitive response and excellent energy storage capability of T-Nb2O5 coupled with the fast charge transfer pathways provided by the conductive 2D Nb2CTx sheets and the as-formed disordered carbon.