Molten salt electrochemical synthesis of low-cost Vn+1AlCn (n=1, 3) and their derived two-dimensional MXenes. Issue 12 (15th June 2022)

• Record Type: Journal Article
• Authors: Gao, Yang; Ge, Jianbang; Wang, Xinrui; Wu, Tao; Zhu, Fei; Duan, Jingjing; Wang, Mingyong; Xue, Jilai; Jiao, Shuqiang
• Is Part Of: Ceramics international. Volume 48:Issue 12(2022)
• Page Start: 17975
• Page End: 17980
• Publication Date: 2022-06-15
• Subjects: MAX -- MXene -- Electrodeoxidation -- Molten salt -- 2D materials; Ceramics -- Periodicals; Céramique industrielle -- Périodiques; Ceramics; Periodicals; Electronic journals; 666
• DOI: 10.1016/j.ceramint.2022.03.222
• Languages: English
• ISSNs: 0272-8842

Abstract

Abstract: Herein we report a molten salt electrochemical approach to synthesize two MAX phases, V2 AlC and V4 AlC3, using inexpensive V2 O3, Al2 O3, and graphite as raw materials. The oxides/carbon mixture is directly reduced into MAX phases under cathodic polarization at moderate temperatures (600–850 °C). The corresponding MXenes, V2 CTx and V4 C3 Tx, are successfully produced through the HF etching method. The optimized molar ratio of V2 O3 /Al2 O3 /C precursor for V2 AlC synthesis is achieved, and the resulting V2 CTx film possesses great stability in air at 30 °C for at least 10 days. Furthermore, the obtained V2 CTx and V4 C3 Tx exhibit excellent capacities of 468 mAh g −1 and 152 mAh g −1 after 100 cycles, respectively, at a current density of 100 mA/g, comparable to those made from conventional methods.