Two-Dimensional Titanium Carbide/RGO Composite for High-Performance Supercapacitors.
Two-Dimensional Titanium Carbide/RGO Composite for High-Performance Supercapacitors.
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DOI：
10.1021/acsami.6b04767
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发表时间：
2016-06
影响因子：
9.5
通讯作者：
Chongjun Zhao;Qian Wang;Huang Zhang;S. Passerini;Xiuzhen Qian
中科院分区：
文献类型：
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作者：
Chongjun Zhao;Qian Wang;Huang Zhang;S. Passerini;Xiuzhen Qian
Ti3C2Tx是一种MXenes家族的二维碳化钛，由Ti3AlC2通过Al层的选择性蚀刻得到。由于Ti3C2Tx具有良好的导电性和高容量容量，因此被认为是超级电容器的理想候选材料。本文报道了制备不同Ti3C2Tx和RGO比例的Ti3C2Tx/RGO复合材料，其中RGO作为导电“桥”连接不同的Ti3C2Tx块和基体，以减轻充放电过程中的体积变化。此外，还原氧化石墨烯纳米片可以作为第二个纳米级电流收集器和支持电极。用CV、GCD和EIS对制备的Ti3C2Tx/RGO电极的电化学性能进行了表征。当Ti3C2Tx: RGO重量比为7:1时，在2a /g下获得了154.3 F/g的最高比电容（Cs），并在4a /g下循环6000次后获得了出色的容量保持（124.7 F/g）。
Ti3C2Tx, 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, Ti3C2Tx is regarded as a promising candidate for supercapacitors. In this paper, the fabrication of Ti3C2Tx/RGO composites with different proportions of Ti3C2Tx and RGO is reported, in which RGO acts as a conductive "bridge" to connect different Ti3C2Tx 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 Ti3C2Tx/RGO electrodes, characterized by CV, GCD, and EIS, are also reported. A highest specific capacitance (Cs) of 154.3 F/g at 2 A/g is obtained at the Ti3C2Tx: RGO weight ratio of 7:1 combined with an outstanding capacity retention (124.7 F/g) after 6000 cycles at 4 A/g.