Two-dimensional V4C3 MXene as high performance electrode materials for supercapacitors. (1st June 2019)

• Record Type: Journal Article
• Authors: Wang, Xin; Lin, Shuai; Tong, Haiyun; Huang, Yanan; Tong, Peng; Zhao, Bangchuan; Dai, Jianming; Liang, Changhao; Wang, Hai; Zhu, Xuebin; Sun, Yuping; Dou, Shixue
• Is Part Of: Electrochimica acta. Volume 307(2019)
• Page Start: 414
• Page End: 421
• Publication Date: 2019-06-01
• Subjects: V4C3 MXene -- Supercapacitor electrode materials -- High capacitance -- Rate performance -- Cycling stability; Electrochemistry -- Periodicals; Electrochemistry, Industrial -- Periodicals; 541.37
• DOI: 10.1016/j.electacta.2019.03.205
• Languages: English
• ISSNs: 0013-4686

Abstract

Abstract: Two-dimensional (2D) MXenes such as Ti3 C2, Ti2 C, Mo2 C, and Mo1.33 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 V4 C3 MXene has been synthesized by selectively etching Al from V4 AlC3 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 H2 SO4 . Importantly, the pseudocapacitance (∼100.1 F g −1 ) accounts for about 37% of the total capacity (∼268.5 F g −1 ) for V4 C3 MXene electrode. Therefore, the high specific capacitance of V4 C3 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 V4 C3 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. Graphical abstract: Here we report on the synthesis of two-dimensional multi-layered V4 C3 MXene and its electrochemical performances as supercapacitor electrode. Large interlayer spacing and specific surface area as well as excellent hydrophilicity are obtained in as-prepared V4 C3 MXene. As a supercapacitor electrode, it shows high capacitance (∼209 F g −1 at 2 mV s −1 ), good rate performance, and stable long cyclic performance (capacitance retention rate is 97.23% after 10000 cycles at 10 A g −1 ) in 1 M H2 SO4 electrolyte.Image 1 Highlights: Two-dimensional multi-layered V4 C3 MXene is synthesized by etching Al from V4 AlC3 . V4 C3 possesses large interlayer spacing and specific surface as well as good hydrophilicity and electrical conductivity. As supercapacitors electrode materials, V4C3 shows excellent electrochemical performance in 1 M H2 SO4 . V4 C3 MXene is a typical pseudocapacitive electrode material for supercapacitors.