Two-Dimensional Titanium Carbide/RGO Composite for High-Performance Supercapacitors

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• 作者：Chongjun Zhao ; Qian Wang ; Huang Zhang ; Stefano Passerini ; Xiuzhen Qian
• 刊名：ACS Applied Materials & Interfaces
• 出版年：2016
• 出版时间：June 22, 2016
• 年：2016
• 卷：8
• 期：24
• 页码：15661-15667
• 全文大小：608K
• 年卷期：0
• ISSN：1944-8252

文摘

Ti₃C₂T_x, a 2D titanium carbide in the MXenes family, is obtained from Ti₃AlC₂ through selective etching of the Al layer. Due to its good conductivity and high volumetric capacitance, Ti₃C₂T_x is regarded as a promising candidate for supercapacitors. In this paper, the fabrication of Ti₃C₂T_x/RGO composites with different proportions of Ti₃C₂T_x and RGO is reported, in which RGO acts as a conductive “bridge” to connect different Ti₃C₂T_x blocks and a matrix to alleviate the volume change during charge/discharge process. In addition, RGO nanosheets can serve as a second nanoscale current collector and support as well for the electrode. The electrochemical performance of the as-fabricated Ti₃C₂T_x/RGO electrodes, characterized by CV, GCD, and EIS, are also reported. A highest specific capacitance (C_s) of 154.3 F/g at 2 A/g is obtained at the Ti₃C₂T_x: RGO weight ratio of 7:1 combined with an outstanding capacity retention (124.7 F/g) after 6000 cycles at 4 A/g.