16 Apr 2013 | Olha Mashtalir, Michael Naguib, Vadym N. Mochalin, Yohan Dall'Agnese, Min Heon, Michel W. Barsoum & Yury Gogotsi
This article reports on the intercalation and delamination of two-dimensional (2D) layered carbides and carbonitrides, specifically MXenes such as Ti3C2, Ti3CN, and TiNbC. Intercalation of hydrazine and its co-intercalation with N,N-dimethylformamide (DMF) significantly increased the c-lattice parameters of surface-functionalized Ti3C2. Molecular dynamics simulations suggest that hydrazine intercalates between Ti3C2 layers, and DMSO intercalation followed by sonication in water leads to delamination, forming a stable colloidal solution that can be filtered to produce MXene 'paper'. This paper shows excellent Li-ion capacity at high charging rates.
The study highlights the ability of layered materials to accommodate various ions and molecules between their layers, a process known as intercalation. MXenes, a family of 2D materials derived from layered ternary carbides, have shown promise as anode materials for Li-ion batteries due to their high electrical conductivity and predicted high elastic moduli. However, chemical intercalation and large-scale delamination of MXenes have not been previously reported.
The research focused on intercalating hydrazine and other compounds into MXenes, leading to structural changes and enhanced properties. The intercalation of DMSO enabled the delamination of stacked Ti3C2 layers into separate 2D MXene sheets, forming a stable colloidal solution. This 'paper' demonstrated a Li-ion capacity four times higher than that of as-synthesized MXene.
The study also explored the intercalation of various organic compounds into MXenes, with DMSO and urea showing significant effects. The results indicate that MXenes can be intercalated by a variety of organic molecules, and that delamination can be achieved through sonication in water. The delaminated MXene 'paper' showed excellent performance in Li-ion batteries, with a capacity of 410 mA h g⁻¹ at a 1C rate and 110 mA h g⁻¹ at 36C.
The findings have both fundamental and practical significance. Fundamentally, they demonstrate that MXenes can be intercalated by a wide range of organic molecules, expanding the potential applications of 2D materials. Practically, the results open new avenues for applications in composites, catalysis, sorption, and energy storage systems. The study also provides insights into the electrochemical behavior of delaminated MXenes, highlighting their potential as high-performance anode materials for Li-ion batteries.This article reports on the intercalation and delamination of two-dimensional (2D) layered carbides and carbonitrides, specifically MXenes such as Ti3C2, Ti3CN, and TiNbC. Intercalation of hydrazine and its co-intercalation with N,N-dimethylformamide (DMF) significantly increased the c-lattice parameters of surface-functionalized Ti3C2. Molecular dynamics simulations suggest that hydrazine intercalates between Ti3C2 layers, and DMSO intercalation followed by sonication in water leads to delamination, forming a stable colloidal solution that can be filtered to produce MXene 'paper'. This paper shows excellent Li-ion capacity at high charging rates.
The study highlights the ability of layered materials to accommodate various ions and molecules between their layers, a process known as intercalation. MXenes, a family of 2D materials derived from layered ternary carbides, have shown promise as anode materials for Li-ion batteries due to their high electrical conductivity and predicted high elastic moduli. However, chemical intercalation and large-scale delamination of MXenes have not been previously reported.
The research focused on intercalating hydrazine and other compounds into MXenes, leading to structural changes and enhanced properties. The intercalation of DMSO enabled the delamination of stacked Ti3C2 layers into separate 2D MXene sheets, forming a stable colloidal solution. This 'paper' demonstrated a Li-ion capacity four times higher than that of as-synthesized MXene.
The study also explored the intercalation of various organic compounds into MXenes, with DMSO and urea showing significant effects. The results indicate that MXenes can be intercalated by a variety of organic molecules, and that delamination can be achieved through sonication in water. The delaminated MXene 'paper' showed excellent performance in Li-ion batteries, with a capacity of 410 mA h g⁻¹ at a 1C rate and 110 mA h g⁻¹ at 36C.
The findings have both fundamental and practical significance. Fundamentally, they demonstrate that MXenes can be intercalated by a wide range of organic molecules, expanding the potential applications of 2D materials. Practically, the results open new avenues for applications in composites, catalysis, sorption, and energy storage systems. The study also provides insights into the electrochemical behavior of delaminated MXenes, highlighting their potential as high-performance anode materials for Li-ion batteries.