Structural, magnetic properties of in-plane chemically ordered (Mo2/3R1/3)2AlC (R = Gd, Tb, Dy, Ho, Er and Y) MAX phase and enhanced capacitance of Mo1.33C MXene derivatives

• Published in: Carbon (New York) 2021-07, Vol.179, p.104-110
• Main Authors: Yang, Jiaxin, Yao, Guiquan, Sun, Shuli, Chen, Zhaohui, Yuan, Shuang, Wu, Kai, Fu, Xiaoxiao, Wang, Qiang, Cui, Weibin
• Format: Article
• Language: English
• Subjects: Antiferromagnetism; Capacitance; Crystal structure; Crystallography; Dysprosium; Electrochemical properties; Erbium; Ferromagnetism; Gadolinium; Hydrazines; i-MAX phase; Magnetic properties; Magnetism; MXene; MXenes; Phases; Rare earth elements; Terbium; Trace elements; Yttrium
• ISSN: 0008-6223; 1873-3891
• DOI: 10.1016/j.carbon.2021.03.062

The crystallographic structure of rare-earth-contained (Mo2/3R1/3)2AlC (R = Gd, Tb, Dy, Ho, Er and Y) i-MAX phases have been verified to be C2/c monoclinic. The magnetic behaviors are varied from antiferromagnetism to non-linear ferromagnetism from R = Gd to Ho in (Mo2/3R1/3)2AlC i-MAX phases due to variant R-R interactions. The capacitance of Mo1.33C@R MXene derived from different (Mo2/3R1/3)2AlC precursors varies from 170 F/g to 228 F/g but can be double by hydrazine monohydrate treatment. The highest one of 431 F/g up to now has been achieved in Mo1.33C@Y-HM MXene, which is caused by the increased fraction of critical -O group evidenced by XPS spectra. Our results illustrate the promising applications in supercapacitor of Mo1.33C MXene derived from R-contained (Mo, R)2AlC i-MAX phases. [Display omitted]