Universal Access to Two‐Dimensional Mesoporous Heterostructures by Micelle‐Directed Interfacial Assembly

Abstract

Tw o-dimensional (2D) mesoporous heterostructures combining ultrathin nanosheet morphology,p eriodic porous surface structures,a nd diverse hybrid compositions have become increasingly important for renewable energy storage and electronics.H owever,i tr emains ag reat challenge to develop au niversal method to prepare 2D mesoporous heterostructures.Herein, we report acomposite-micelle-directed interfacial assembly method to synthesize heterostructures of an ultrathin 2D material covered with mesoporous monolayers assembled on both sides.Todemonstrate the concept, we first fabricated an ew sandwichlike carbon@MXene@carbon mesoporous heterostructure through the self-assembly of exfoliated MXene nanosheets and blockc opolymer F127/ melamine-formaldehyde resin composite micelles and subsequent thermal treatment. Finally,w ed emonstrate that the carbon@MXene@carbon mesoporous heterostructured nanosheets manifest remarkably enhanced electrochemical performance as acathode material for lithium-sulfur batteries.

Covalent Assembly of Two‐Dimensional COF‐on‐MXene Heterostructures Enables Fast Charging Lithium Hosts

“…As an emerging 2D material, MXenes are being actively studied as desired precursors for constructing extended architectures. [16][17][18][19] Unlike other 2D materials, such as graphene and transition metal dichalcogenides, MXene nanosheets with the combined properties of excellent electronic conductivity and abundant terminal groups (e.g., hydroxyl groups) can enable the generation of versatile MXene-based hybrids via electrostatic absorption or intercalation, which is important for alleviating MXene self-restacking and enhancing compound electrical conductivity. [20,21] Based on this, CNTs, [21][22][23] polymers, [24] and metalbased particles [17,[25][26][27] have been combined with MXenes for various electrochemical energy storage applications.…”

Application of a Ti3C2TX MXene-Coated Membrane for Removal of Selected Natural Organic Matter and Pharmaceuticals

“…20 Additionally, by ionizing these terminations, the membrane can have a more negatively charged surface, leading to enhanced electrostatic interaction with charged contaminants. 21 To evaluate the crystal phase of the Ti 3 C 2 T X MXene-coated membrane, the XRD patterns were used (Figure 1j). The XRD patterns match those of the previously reported studies for Ti 3 C 2 T X MXenecoated membranes.…”

“…These results indicate the membrane can have a more hydrophilic surface that allows water to pass through easily and blocks hydrophobic contaminants . Additionally, by ionizing these terminations, the membrane can have a more negatively charged surface, leading to enhanced electrostatic interaction with charged contaminants . To evaluate the crystal phase of the Ti 3 C 2 T X MXene-coated membrane, the XRD patterns were used (Figure j).…”

Fabrication of a Covalent Triazine Framework Functional Interlayer for High-Performance Lithium–Sulfur Batteries

“…During the charge-discharge cycles, the polysulfide intermediates will shuttle across the separator and react with the lithium anode, resulting in rapid capacity loss and low Coulombic efficiency of the sulfur cathode [2][3][4][5][6]. To reduce the shuttling effect of polysulfides, tremendous efforts have been devoted to developing nanostructured sulfur hosts, such as carbon-based materials, conductive polymers, transition metal oxides, and their composites [7][8][9][10][11][12][13]. These sulfur-host materials can enhance the polysulfide retention by physically confining the polysulfide intermediates in the pores.…”