Key Laboratory for Photonic and Electronic Bandgap Materials, Ministry of Education, School of Physics and Electronic Engineering, Harbin Normal University, Harbin 150025, PR China.
Department of Chemistry and Chemical Biology, Cornell University, Ithaca, NY 14853, United States.
J Colloid Interface Sci. 2018 Feb 1;511:128-134. doi: 10.1016/j.jcis.2017.09.104. Epub 2017 Sep 28.
Two-dimensional titanium carbide has gained considerable attention in recent years as an electrode material for supercapacitors due to its high melting point, good electrical conductivity, hydrophilicity and large electrochemically active surfaces. However, the irreversible restacking during synthesis restricts its development and practical applications. Here, TiCT/SCNT self-assembled composite electrodes were rationally designed and successfully synthesized by introducing single-walled carbon nanotubes (SCNTs) as interlayer spacers to decrease the restacking of the TiCT sheets during the synthesis process. SCNTs can not only increase the specific surface area as well as the interlayer space of the TiCT electrode, but also increase the accessible capability of electrolyte ions, and thus it improved the electrochemical performance of the electrode. The as-prepared TiCT/SCNT self-assembled composite electrode achieved a high areal capacitance of 220mF/cm (314F/cm) and a remarkable capacitance retention of 95% after 10,000cycles.
二维碳化钛由于其熔点高、导电性好、亲水性和大的电化学活性表面，近年来作为超级电容器的电极材料引起了相当大的关注。然而，在合成过程中不可逆转的堆积限制了它的发展和实际应用。在这里，通过引入单壁碳纳米管（SCNT）作为层间间隔物来合理设计和成功合成了 TiCT/SCNT 自组装复合电极，以减少 TiCT 片在合成过程中的堆积。SCNT 不仅可以增加 TiCT 电极的比表面积和层间空间，还可以增加电解质离子的可及性，从而提高了电极的电化学性能。所制备的 TiCT/SCNT 自组装复合电极的比面积电容高达 220mF/cm（314F/cm），在 10000 次循环后电容保持率高达 95%。
