Title

Two-dimensional V4C3MXene as high performance electrodematerials for supercapacitors

RIS ID

134962

Publication Details

Wang, X., Lin, S., Tong, H., Huang, Y., Tong, P., Zhao, B., Dai, J., Liang, C., Wang, H., Zhu, X., Sun, Y. & Dou, S. (2019). Two-dimensional V4C3MXene as high performance electrodematerials for supercapacitors. Electrochimica Acta, 307 414-421.

Abstract

Two-dimensional (2D) MXenes such as Ti 3 C 2 , Ti 2 C, Mo 2 C, and Mo 1.33 C have shown excellent electrochemical performances as supercapacitor electrodes, and the exploration of new and/or high-capacity MXene-based supercapacitor electrode materials is an active field. In this work, 2D multi-layered V 4 C 3 MXene has been synthesized by selectively etching Al from V 4 AlC 3 and it shows a high capacitance of 209 F g −1 at 2 mV s −1 , good rate performance, and stable long cyclic performance with capacitance retention rate of 97.23% after 10000 cycles at 10 A g −1 in 1 M H 2 SO 4 . Importantly, the pseudocapacitance (∼100.1 F g −1 ) accounts for about 37% of the total capacity (∼268.5 F g −1 ) for V 4 C 3 MXene electrode. Therefore, the high specific capacitance of V 4 C 3 MXene is not only due to their wide interlayer spacing (∼0.466 nm), large specific surface areas (∼31.35 m 2 g −1 ) and pore volumes (∼0.047 cm 3 g −1 ), and good hydrophilicity but also attributed to the abundant valence states of vanadium (+2, +3, and +4). The high rate performance and excellent cycling stability of V 4 C 3 MXene electrodes are mainly attributed to the high electronic conductivity (1137 S m −1 at 300 K). The present work provides another promising MXene-based supercapacitor electrode material.

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Link to publisher version (DOI)

http://dx.doi.org/10.1016/j.electacta.2019.03.205