Facile self-assembly of sandwich-like MXene layered multiscale structure nanocomposite. (1st January 2023)

• Record Type: Journal Article
• Authors: Guo, ZhiJin; Zhang, Yan; Zhou, JianPing; Sun, DaQian; Li, HongMei
• Is Part Of: 2D materials. Volume 10:Number 1(2023)
• Publication Date: 2023-01-01
• Subjects: MXene -- multiscale structure -- multiple synthesis -- synergistic effect -- composites; Graphene -- Periodicals; Materials science -- Periodicals; Nanostructured materials -- Periodicals; 620.115
• DOI: 10.1088/2053-1583/aca4e1
• Languages: English
• ISSNs: 2053-1583

Abstract

Abstract: V2 CT x shows a low ion diffusion barrier, while the multiple oxidation states of vanadium allow V2 CT x to participate in multi-electron redox reactions, which demonstrates a greater potential for electrochemical energy storage applications. However, the lateral arrangement of V2 CT x lamellae tends to cause the accumulation and collapse of the structure. Herein, the two-dimensional layered V2 CT x is modified with Ag + and Cu 2+, the V2 CT x /Ag/Cu composite is successfully prepared. The Ag nanoparticles (NPs) and Cu NPs grown between the layers of V2 CT x can effectively suppress the accumulation of the lamellae and ensure the smooth transfer of electrolyte ions and electrons between the layers. Meanwhile, the doping of Ag NPs and Cu NPs can enlarge the interlayer spacing of V2 CT x, which can expose more active contact sites for electrolyte ions, shorten the diffusion path of electrolyte ions, and effectively improve the electrochemical performance of V2 CT x . The Ag NPs and Cu NPs agglomerate in the delamination of V2 CT x to form a conductive channel covering multiple layers, which facilitates cross-layer electron transfer and reduces the internal resistance of the V2 CT x /Ag/Cu composite. Basis on the above reasonable structural designs, the internal resistance of the V2 CT x /Ag/Cu composite is only 0.72 Ω, showing excellent diffusion ability of K + . The result represents a new step forward in exploring the electrochemical properties of two dimensional materials of V2 CT x .