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A simple and generic strategy is proposed to pattern thin films deposited by a solution processable route. A soft approach based on an automated scalpel technique is developed to engrave thin films in a single step for sculpting functional planar devices. MXenes—the emerging family of 2D transition metal carbides and nitrides—combine metallic conductivity and hydrophilicity, enabling solution processing...
Being conductive and flexible, MXenes, including transition metal carbides and nitrides, are expected to compete with, or even outperform graphene as 2D substrates serving in versatile applications. On the other hand, the extraordinary electrochemical activities of MXenes make them promising candidates as electrode materials in rechargeable batteries and supercapacitors, or as electrocatalysts in...
In article number 1804732, Shayan Seyedin, Joselito M. Razal, and co‐workers make a class of flexible and highly conductive fibers from MXene and PEDOT:PSS that when fabricated into elastic energy storing devices demonstrate high performance even when stretched multiple times. This work provides a promising energy storage solution for powering miniaturized or wearable electronics.
Fiber‐shaped supercapacitors (FSCs) are promising energy storage solutions for powering miniaturized or wearable electronics. However, the scalable fabrication of fiber electrodes with high electrical conductivity and excellent energy storage performance for use in FSCs remains a challenge. Here, an easily scalable one‐step wet‐spinning approach is reported to fabricate highly conductive fibers using...
Developing an efficient electrocatalyst for the hydrogen evolution reaction (HER) working in both acidic and alkaline solutions is highly desirable, but still remains challenging. Here, PtxNi ultrathin nanowires (NWs) with tunable compositions (x = 1.42, 3.21, 5.67) are in situ grown on MXenes (Ti3C2 nanosheets), serving as electrocatalysts toward HER. Such PtxNi@Ti3C2 electrocatalysts exhibit excellent...
MXenes, a bourgeoning class of 2D transition metal carbides, are of considerable interest in catalysis due to their rich surface chemistry, tunable electronic structures, and thermal stability. Here, recent conceptual advances in applying MXenes and their nanocomposites in (photo)electrocatalysis and conventional heterogeneous catalysis are highlighted. In addition, the nature of active sites in the...
In article number 1906814, Changqing Zhang, Yu Chen, Youshui Gao, and co‐workers report on the construction of a multifunctional biomaterial system for achieving a combinatory osteosarcoma ablation and osseous regeneration. The design of this multifunctional scaffold with the specific features of controllable nitric oxide release, efficient photothermal conversion and stimulatory bone regeneration...
The rising concerns of the recurrence and bone deficiency in surgical treatment of malignant bone tumors have raised an urgent need of the advance of multifunctional therapeutic platforms for efficient tumor therapy and bone regeneration. Herein, the construction of a multifunctional biomaterial system is reported by the integration of 2D Nb2C MXene wrapped with S‐nitrosothiol (RSNO)‐grafted mesoporous...
Electroactive yarns that are stretchable are desired for many electronic textile applications, including energy storage, soft robotics, and sensing. However, using current methods to produce these yarns, achieving high loadings of electroactive materials and simultaneously demonstrating stretchability is a critical challenge. Here, a one‐step bath electrospinning technique is developed to effectively...
The environmental stability of 2D MXene flakes must be systematically studied before their further application. Herein, the colloidal dispersibility and photochemical stability of delaminated Ti3C2Tx MXene flakes modified with hydrazine (HMH) and KOH and with water as the control (HMH‐Ti3C2, KOH‐Ti3C2, and H2O‐Ti3C2, respectively) are experimentally and theoretically studied. Modification greatly...
2D materials have shown high potentials for fabricating next‐generation membranes. To date, extensive studies have focused on the applications of 2D material membranes in gas and aqueous media. Recently, compelling opportunities emerge for 2D material membranes in separation applications in organic solvents because of their unique properties, such as ultrathin mono‐ to few‐layers, outstanding chemical...
Direct printing of functional inks onto flexible substrates allows for scalable fabrication of wearable electronics. However, existing ink formulations for inkjet printing require toxic solvents and additives, which make device fabrication more complex, limit substrate compatibility, and hinder device performance. Even water‐based carbon or metal nanoparticle inks require supplemental surfactants,...
Recently, 2D materials are in great demand for various applications such as optical devices, supercapacitors, sensors, and biomedicine. MXenes as a kind of novel 2D material have attracted considerable research interest due to their outstanding mechanical, thermal, electrical, and optical properties. Especially, the excellent nonlinear optical response enables them to be potential candidates for the...
MXenes as a kind of novel 2D transition metal carbon and/or nitrogen materials are commonly prepared by etching A‐group elements (mostly groups 13 or 14) from MAX phases. Owing to the excellent optical properties, MXenes have been widely used to realize ultrafast pulses in different lasers. In article number 2006054, Jiebo Li, Han Zhang, and co‐workers review the state of the art of MXenes, where...
Single atom catalysts (SACs) have shown their noticeable potential and gradually become a new favorite in catalytic field due to the particular selectivity, high catalytic performance, and strong durability. The most important factor in the synthesis of SACs is the selection of appropriate support and formation of metal–support interaction. Among a large number of nanomaterials, MXenes can be utilized...
Incorporation of 2D MXenes into the electron transporting layer (ETL) of perovskite solar cells (PSCs) has been shown to deliver high‐efficiency photovoltaic (PV) devices. However, the ambient fabrication of the ETLs leads to unavoidable deterioration in the electrical properties of MXene due to oxidation. Herein, sorted metallic single‐walled carbon nanotubes (m‐SWCNTs) are employed to prepare MXene/SWCNTs...
Electrochemical N2 fixation represents a promising strategy toward sustainable NH3 synthesis, whereas the rational design of high‐performance catalysts for the nitrogen reduction reaction (NRR) is urgently required but remains challenging. Herein, a novel hexagonal BN quantum dots (BNQDs) decorated Nb2CTx–MXene (BNQDs@Nb2CTx) is explored as an efficient NRR catalyst. BNQDs@Nb2CTx presents the optimum...
2D materials have been interesting for applications into nanodevices due to their intriguing physical properties. In this work, four types of unique structures are designed that are composed of MXenes and C/N‐Si layers (CNSi), where MXene is sandwiched by the CNSi layers with different thicknesses, for their practical applications into integrated devices. The systematic calculations on their elastic...
Three‐dimensional (3D) porous MXene‐based aerogel architectures have attracted great interest for many applications, despite limits in renewable energy conversion owing to the lack of multifunctionality in their components. Herein, a simple and general strategy for constructing a novel functional 3D MXene‐based composite heterojunction aerogel (MS@S‐MAs) is presented via divalent metal‐ion assembly...
Research on 2D nanomaterials is still in its early stages. Most studies have focused on elucidating the unique properties of the materials, whereas only few reports have described the biomedical applications of 2D nanomaterials. Recently, important questions about the interaction of 2D MXene nanomaterials with biological components have been raised. 2D MXenes are monolayer atomic nanosheets derived...
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