Tetrabutylammonium‐Intercalated 1T‐MoS2 Nanosheets with Expanded Interlayer Spacing Vertically Coupled on 2D Delaminated MXene for High‐Performance Lithium‐Ion Capacitors. (24th June 2021)

• Record Type: Journal Article
• Authors: Wang, Lei; Zhang, Xiong; Xu, Yanan; Li, Chen; Liu, Wenjie; Yi, Sha; Wang, Kai; Sun, Xianzhong; Wu, Zhong‐Shuai; Ma, Yanwei
• Is Part Of: Advanced functional materials. Volume 31:Number 36(2021)
• Page Start: n/a
• Page End: n/a
• Publication Date: 2021-06-24
• Subjects: 1T phase MoS 2 -- lithium‐ion capacitors -- MXenes -- porous graphene nanocomposites -- tetrabutylammonium; Materials -- Periodicals; Chemical vapor deposition -- Periodicals; 620.11
• DOI: 10.1002/adfm.202104286
• Languages: English
• ISSNs: 1616-301X

Abstract

Abstract: 2D 1T phase MoS2 (1T‐MoS2 ) nanosheet with metallic conductivity and expanded interlayer spacing is considered as a highly potential lithium storage electrode material but remains thermodynamic instability in aqueous media, seriously hindering the electrochemical performance. Herein, a versatile strategy is proposed for the preparation of thermodynamically stable 1T‐MoS2 /MXene heterostructures with the aid of delaminated Ti3 C2 T x MXene (d‐Ti3 C2 T x ) dispersion containing tetrabutylammonium hydroxide. The 2D d‐Ti3 C2 T x provides more uniform nucleation sites for MoS2, and the TBA + ions can intercalate into MoS2 to induce the phase conversion from semiconducting 2H to 1T. Moreover, the electrochemical advantages of 1T‐MoS2 and d‐Ti3 C2 T x can be united by the construction of a well‐organized heterostructure. Outstanding rate performance is realized because of extra‐large interlayer space of 1T MoS2 with TBA + intercalation and decreased energy barrier for fast Li + diffusion. Subsequently, a lithium‐ion capacitor (LIC) is assembled based on 1T‐MoS2 /d‐Ti3 C2 T x as anode and hierarchically porous graphene nanocomposite with micro/mesoporous structure as a cathode. The LIC exhibits a large energy density up to 188 Wh kg −1, an ultra‐high power density of 13 kW kg −1, together with remarkable capacity retention of 83% after 5000 cycles. This study demonstrates the great promise of 1T‐MoS2 /d‐Ti3 C2 T x heterostructures as anode for high‐performance LICs. Abstract : 2D 1T‐MoS2 is uniformly and vertically grown on delaminated MXene Ti3 C2 T x with the aid of delaminated Ti3 C2 T x MXene dispersion containing tetrabutylammonium hydroxide. The as‐prepared 1T‐MoS2 /d‐Ti3 C2 T x heterostructure electrodes possess the impressive capacity and rate performances and further couple with graphene nanocomposite cathode to fabricate lithium‐ion capacitor, which provides a promising paradigm for fast lithium storage materials.