期刊
CHEMISTRY OF MATERIALS
卷 28, 期 11, 页码 3937-3943出版社
AMER CHEMICAL SOC
DOI: 10.1021/acs.chemmater.6b01244
关键词
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资金
- U.S. Department of Energy, Office of Electricity, Delivery and Energy Reliability, Energy Storage Systems Program, through Sandia National Laboratory
- Chinese Scholarship Council (CSC) [201206740035]
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.
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