Two-dimensional (2D) heterostructured materials, combining the collective advantages of individual building blocks and synergistic properties, have spurred great interest as a new paradigm in materials science. The family of 2D transition-metal carbides and nitrides, MXenes, has emerged as an attractive platform to construct functional materials with enhanced performance for diverse applications. Here, we synthesized 2D MoS2 -on-MXene heterostructures through in situ sulfidation of Mo2 TiC2 Tx MXene. The computational results show that MoS2 -on-MXene heterostructures have metallic properties. Moreover, the presence of MXene leads to enhanced Li and Li2 S adsorption during the intercalation and conversion reactions. These characteristics render the as-prepared MoS2 -on-MXene heterostructures stable Li-ion storage performance. This work paves the way to use MXene to construct 2D heterostructures for energy storage applications.

MoS2-on-MXene Heterostructures as Highly Reversible Anode Materials for Lithium-Ion Batteries

Ultrathin 2D materials can offer promising opportunities for exploring advanced energy storage systems, with satisfactory electrochemical performance. Engineering atomic interfaces by stacking 2D crystals holds huge potential for tuning material properties at the atomic level, owing to the strong layer-layer interactions, enabling unprecedented physical properties. In this work, atomically thin Bi2 MoO6 sheets are acquired that exhibit remarkable high-rate cycling performance in Li-ion batteries, which can be ascribed to the interlayer coupling effect, as well as the 2D configuration and intrinsic structural stability. The unbalanced charge distribution occurs within the crystal and induces built-in electric fields, significantly boosting lithium ion transfer dynamics, while the extra charge transport channels generated on the open surfaces further promote charge transport. The in situ synchrotron X-ray powder diffraction results confirm the material's excellent structural stability. This work provides some insights for designing high-performance electrode materials for energy storage by manipulating the interface interaction and electronic structure.

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Atomic Interface Engineering and Electric-Field Effect in Ultrathin Bi 2 MoO 6 Nanosheets for Superior Lithium Ion Storage

Functionalization of carbon nanomaterials for advanced polymer nanocomposites: A comparison study between CNT and graphene

The discovery of graphene one decade ago has triggered enormous interest in developing two-dimensional materials (2DMs)—that is 2D allotropes of various elements or compounds (consisting of two or more covalently bonded elements) or molecular frameworks with periodic structures. At present, various synthesis strategies have been exploited to produce 2DMs, such as top-down exfoliation and bottom-up chemical vapor deposition and solution synthesis methods. In this review article, we will highlight the interfacial roles toward the controlled synthesis of inorganic and organic 2DMs with varied structural features. We will summarize the state-of-the-art progress on interfacial synthesis strategies and address their advancements in the structural, morphological, and crystalline control by the direction of the arrangement of the molecules or precursors at a confined 2D space. First, we will provide an overview of the interfaces and introduce their advantages and uniqueness for the synthesis of 2DMs, followed by ...

Interface-Assisted Synthesis of 2D Materials: Trend and Challenges

The development of renewable energy storage and conversion devices is one of the most promising ways to address the current energy crisis, along with the global environmental concern. The exploration of suitable active materials is the key factor for the construction of highly efficient, highly stable, low-cost and environmentally friendly energy storage and conversion devices. The ability to prepare two-dimensional (2D) metal dichalcogenide (MDC) nanosheets and their functional composites in high yield and large scale via various solution-based methods in recent years has inspired great research interests in their utilization for renewable energy storage and conversion applications. Here, we will summarize the recent advances of solution-processed 2D MDCs and their hybrid nanomaterials for energy storage and conversion applications, including rechargeable batteries, supercapacitors, electrocatalytic hydrogen generation and solar cells. Moreover, based on the current progress, we will also give some personal insights on the existing challenges and future research directions in this promising field.

Solution-Processed Two-Dimensional Metal Dichalcogenide-Based Nanomaterials for Energy Storage and Conversion.

A novel strategy for the controlled synthesis of 2D MoS2/C hybrid nanosheets consisting of the alternative layer-by-layer interoverlapped single-layer MoS2 and mesoporous carbon (m-C) is demonstrated. Such special hybrid nanosheets with a maximized MoS2 /m-C interface contact show very good performance for lithium-ion batteries in terms of high reversible capacity, excellent rate capability, and outstanding cycling stability.

2D Monolayer MoS2–Carbon Interoverlapped Superstructure: Engineering Ideal Atomic Interface for Lithium Ion Storage

Reciprocal hybridization of MoO2 nanoparticles and few-layer MoS2 for stable lithium-ion batteries.

Few-layer MoS2 nanosheets incorporated into hierarchical porous carbon for lithium-ion batteries

The preparation of few-layered ultrasmall MoS2 nanosheets inlayed into carbon frameworks is challenging to date. Herein, we realize the synthesis of such meaningful nanohybrids (labeled as MoS2/CFs hybrids) by a simple salt-templating protocol, where NaCl particles are chosen as a sacrificial template to grow MoS2 crystals on the surface during the glucose carbonization, which meanwhile effectively inhibits their growth and stacking. In regard to electrochemical energy storage and conversion, the resulting MoS2/CFs hybrids are beneficial for providing substantial and accessible electroactive sites as well as rapid electrons/ions transfer. The present hybrids, when applied as lithium-ion batteries anode materials, exhibit a remarkably enhanced reversible specific capacity as high as 1083.5 mAh g–1 at 200 mA g–1 with fast charge/discharge capability (465.4 mAh g–1 at 6400 mA g–1), which is much higher than the exfoliated MoS2 nanosheets (only 97.6 mAh g–1 at 6400 mA g–1) and the commercial graphite. More im...

Salt-Templating Protocol To Realize Few-Layered Ultrasmall MoS2 Nanosheets Inlayed into Carbon Frameworks for Superior Lithium-Ion Batteries

We demonstrate the self-assembly of few-layer MoS2 nanosheets on a CNT backbone via a facile hydrothermal reaction with a subsequent annealing process. In this structure, the few-layer MoS2 nanosheets with controllable contents are alternately and vertically grown on the surface of CNTs, forming a three-dimensional hierarchical nanostructure. The optimized MoS2/CNTs hybrids could be applied as a fascinating anode material for high-rate and long cycle life lithium ion batteries (LIBs). Compared with the commercial MoS2 (716 mA h g−1), the as-prepared MoS2/CNTs hybrids exhibit a much higher specific capacity of 1293 mA h g−1 at 200 mA g−1 with remarkably enhanced rate capability (888 mA h g−1 even at 3200 mA g−1). More significantly, we find that the MoS2/CNTs hybrids show no capacity fading after 200 cycles at 400 mA g−1. As for MoS2-based anode materials, such overwhelming electrochemical performance endows the present MoS2/CNTs hybrids with huge potential for developing LIBs.

Dayong Ren

Papers

2D Monolayer MoS2–Carbon Interoverlapped Superstructure: Engineering Ideal Atomic Interface for Lithium Ion Storage

Reciprocal hybridization of MoO2 nanoparticles and few-layer MoS2 for stable lithium-ion batteries.

Few-layer MoS2 nanosheets incorporated into hierarchical porous carbon for lithium-ion batteries

Salt-Templating Protocol To Realize Few-Layered Ultrasmall MoS2 Nanosheets Inlayed into Carbon Frameworks for Superior Lithium-Ion Batteries

Self-assembling few-layer MoS2 nanosheets on a CNT backbone for high-rate and long-life lithium-ion batteries