RSC Advances
·
2022
·Vol. 12
·期 33
·21600-21608
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IF 4.036
Jinxin Cao,Yuru Wang,Bingqing Wei,Jiaxin Ye,Qing Zhang
Changing the morphology of two-dimensional materials often offers an efficient and effective means to exploit their electronic and mechanical properties. Two-dimensional materials such as graphene can be scrolled into one-dimensional fibers via simple sonication. Unfortunately, scrolling MXene nanosheets into fibers is quite challenging, especially Ti3C2Tx composed of three layers of titanium atoms and two layers of carbon atoms. Herein, we report a new method to fabricate MXene fibers via ascorbic acid (AA) induced scrolling of Ti3C2Tx nanosheets. An unusual AA-Ti3C2Tx interaction is discovered in that intercalated AA molecules bind to and interact with the Ti3C2Tx surface in the form of a hydrogen bonding-bonded assembly instead of as individual molecules, and a sheet-scrolling mechanism is proposed based on this interaction. The as-obtained MXene fibers exhibit a compact cross-section, and the diameter can be tailored from hundreds of nanometers to several micrometers through tuning the MXene/AA ratio. Moreover, the storage modulus of the MXene-fiber sponge attains its maximum value of ∼1 MPa when a unique morphology comprising both fibers and not-yet-scrolled sheets is presented. This work offers a new strategy of fiber-shaping MXenes for applications in structural composites and flexible electronics.
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高影响因子
NEW JOURNAL OF CHEMISTRY
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2022
·Vol. 46
·期 16
·7704-7710
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IF 3.925
Yaqi Wang,Zhihu Pan,Xiaohong Ji
Among transition-metal oxides, vanadium oxides and iron oxides have attracted much attention for electrochemical energy storage devices due to their high theoretical specific capacities and multiple variable valence states of V and Fe. However, the poor conductivity of both oxides leads to poor rate performance and high charge transfer resistance between the electrolyte and electrodes. Herein, Ti3C2Tx-wrapped V2O5/Fe2O3 (VFO) composites were designed and prepared for achieving enhanced electrochemical performance. The VFO composites on carbon cloth were synthesized by a hydrothermal method, and the optimized VFO electrode exhibited a capacitance of 435.2 mF cm−2 at a current density of 2 mA cm−2. By wrapping with Ti3C2Tx, the areal capacitance of the VFO composite electrode was greatly enhanced up to 1150.82 mF cm−2 at a current density of 2 mA cm−2. The enhanced electrochemical performance of the Ti3C2Tx@VFO composites is mainly attributed to the synergistic effects of the improved conductivity and diminished collapse and falling off of VFO during the charging and discharging processes. For practical application, asymmetrical supercapacitor (ASC) MnO2//Ti3C2Tx@VFO devices were constructed. The device exhibited a maximum energy density of 0.17 mW h cm−2 at a power density of 1.26 mW cm−2 with a capacitance retention of 74.92% after 5000 cycles. This work indicates the potential application of various oxides in high-performance supercapacitors by modification with MXenes.
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ACS Nano
·
2021
·
IF 15.881
Xinliang Li,Na Li,Zhaodong Huang,Ze Chen,Yuwei Zhao,Guojin Liang,Qi Yang,Mian Li,Qing Huang,Binbin Dong,Jun Fan,Chunyi Zhi
With fluidity and dangerous corrosiveness, liquid insulating bromine elemental (Br2) can hardly be confined by traditional conductive carriers (mainly carbon materials) for efficient redox without shuttle behavior. Thus, stationary Br2-based energy storage devices are rarely advanced. Here, we introduce an electrochemical active parasite Br2 to the Ti3C2TXMXene host and construct an advanced aqueous zinc redox battery via a facile electrodeposition process (Br-Ti3C2TX). Both ex situ experimental characterizations and density functional theory (DFT) simulations have validated the natural affinity between MXenes and Br species, which is manifested as their spontaneous fixation accompanied by rapid transfer of electrons in the interface region and interlayer confinement. Consequently, the battery delivers a high-voltage plateau at 1.75 V that contributes to an improved energy density of 259 Wh kg–1Br (144 Wh kg–1Br-Ti3C2TX), exhibiting efficient output capability in the high-voltage region. Besides, benefiting from enhanced redox kinetics, the capacity achieved at −15 °C approaches to 69% of the value at room temperature. More importantly, an excellent 10 000 cycles at −15 °C with negligible capacity decay is identified. The paradigm represents a step forward for developing stationary aqueous metal-Br2 batteries.
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ACS Applied Nano Materials
·
2020
·
IF 0
Xiaopeng Han,Ying Huang,Ling Ding,Yan Song,Tiehu Li,Panbo Liu
High-performance absorbers with laminated and three-dimensional structures for abundant interfaces can improve electromagnetic wave absorption property obviously. Meanwhile, the combination and dispersion of components have a positive effect on the microwave absorption (MA) property for excellent absorption bandwidth. Herein, accordion-like MXene/Co-ZIF and MXene/Ni-ZIF composites were synthesized by electrostatic self-assembly between MXene and metal–organic frameworks (Co-MOF and Ni-MOF) and then pyrolyzed in the H2/Ar mixed atmosphere (Co-MOF and Ni-MOF named as Co-ZIF and Ni-ZIF, respectively, after pyrolysis). The MXene/Co-CZIF 50% composites displayed good absorption performance with the optimal RL value of −60.09 dB at 7.36 GHz and the broadened absorption bandwidth 9.3 GHz (RL < −10 dB). MXene/Ni-CZIF 50% exhibited promising performance with the RL value measured up to −64.11 dB at 5.12 GHz, and possessed the ultrabroad effective response bandwidth of 4.56 GHz (RL < −10 dB). Furthermore, a unique accordion-like structure, magnetic–dielectric synergistic, multiple interface scatterings and reflections, and dipole polarization were said to improve MA properties. This study provided a method for the synthesis of absorbers with tunable electromagnetic properties and wide absorption bandwidth of MXene-based composites.
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ACS Applied Materials & Interfaces
·
2020
·
IF 8.758
Minglong Yang,Ye Yuan,Ying Li,Xianxian Sun,Shasha Wang,Lei Liang,Yuanhao Ning,Jianjun Li,Weilong Yin,Yibin Li
Assembling Ti3C2Tx MXene nanosheets into three-dimensional (3D) architecture with controllable alignment is of great importance for electromagnetic wave absorption (EMA) application. However, it is a great challenge to realize it due to the weak van der Waals interconnection between MXene nanosheets. Herein, we propose to introduce gelatin molecules as a “chemical glue” to fabricate the 3D Mxene@gelatin (M@G) nanocomposite aerogel using a unidirectional freeze casting method. The Ti3C2Tx MXene nanosheets are well aligned in the M@G nanocomposite aerogel, yielding much enhanced yet anisotropic mechanical properties. Due to the unidirectional aligned microstructure, the M@G nanocomposite aerogel shows significantly anisotropic EMA properties. M@G-45 shows a −59.5 dB minimum reflection loss (RLmin) at 14.04 GHz together with a 6.24 GHz effective absorption bandwidth in the parallel direction (relative to the direction of unidirectional freeze casting). However, in the vertical direction of the same M@G aerogel, RLmin is shifted to a much lower frequency (4.08 GHz) and the effective absorption bandwidth decreases to 0.86 GHz. The anisotropic electromagnetic energy dissipation mechanism was deeply investigated, and the impendence match plays a critical role for electromagnetic wave penetration. Our lightweight M@G nanocomposite aerogel with controllable MXene alignment is very promising in EMA application.
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TRIBOLOGY INTERNATIONAL
·
2021
·
IF 4.872
Dongmei He,Meng Cai,Han Yan,Qilan Lin,Xiaoqiang Fan,Lin Zhang,Minhao Zhu
Multiple advantages of Ti 3 C 2 T x MXene are of significance to enhance the mechanical properties of organic coating . Herein, few-layer amino-functionalized Ti 3 C 2 T x nanosheets (k-Ti 3 C 2 ) were introduced into interpenetrating polymers network (IPN) for constructing k-Ti 3 C 2 /IPN composite coatings , and their tribological properties were investigated in depth. The composite coating with 0.75 wt% k-Ti 3 C 2 nanosheets displays excellent tribological behaviors under extremely operating conditions, like the lowest COF (0.18) and the highest OCP value (−0.28 V) under tribocorrosion condition. Such excellent tribological properties mainly depend on good dispersion and interfacial compatibility of k-Ti 3 C 2 nanosheets in IPN matrix, as well as amino functionalized Ti 3 C 2 T x nanosheets as barrier to external damage. This work highlights a pathway to solve the wear/corrosion problem of organic coatings under extreme conditions.
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ChemSusChem
·
2019
·Vol. 12
·期 7
·1368-1373
·
IF 7.804
Yanan Jiang,Tao Sun,Xi Xie,Wei Jiang,Jia Li,Bingbing Tian,Chenliang Su
Graphical S‘O’ much win with MXene : A facile method is reported to produce ultrathin Ti 3 C 2 MXene functionalized with oxygen as an electrocatalyst for the hydrogen evolution reaction. The terminal O on the basal plane increases the number of active sites for electrocatalysis. This combined with the high surface area and conductivity enables the O-functionalized MXene to show enhanced electrocatalytic performance for hydrogen evolution. Two-dimensional (2D) transition-metal carbides (MXenes) are widely adopted as potential electrocatalysts for the hydrogen evolution reaction (HER) owing to their metallic conductivity, rich tunable surface chemistry, and atomic thickness with highly exposed active sites. Previously published theoretical results indicate that MXenes functionalized entirely with oxygen have lower Δ G H* for HER. However, MXenes contain many terminal F groups on the basal plane, which is detrimental to the HER. Herein, the development of an ultrathin Ti 3 C 2 MXene nanosheet fully functionalized with oxygen is reported for the HER. The obtained oxygen-functionalized Ti 3 C 2 (Ti 3 C 2 O x ) exhibits a much higher HER activity (190 mV at 10 mA cm −2 ) than that of Ti 3 C 2 T x (T=F, OH, and O). The improved HER performance is attributed to the highly active O sites on the basal plane of Ti 3 C 2 T x MXenes. This study paves way for electrocatalytic applications of MXene materials by tuning their surface functional groups.
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高影响因子
Journal of Energy Storage
·
2024
·
IF 8.9
Zhi Wan,Peilin Zuo,Zhiyuan Chen,Jizhou Yang,Mingxin Ren,Zhenghang Tian,Gangfeng Li,Peng Hu,Feng Teng,Haibo Fan
Ti 3 C 2 T x MXenes have emerged as promising candidates for energy storage applications due to their two-dimensional structure, metallic conductivity, tunable surface functionalities, and intrinsic pseudocapacitive charge storage. This study explores the hydrothermal synthesis of GaOOH/Ti 3 C 2 T x composites using gallium nitrate as the gallium precursor. The incorporation of GaOOH not only expands the interlayer spacing of Ti 3 C 2 T x , facilitating more efficient electrolyte ion migration, but also enhances the material's energy storage capacity by introducing additional active sites and augmenting pseudocapacitance. As an electrode material in supercapacitors, GaOOH/Ti 3 C 2 T x composites, prepared with a 0.06 M gallium source concentration, achieve a remarkable specific capacitance of 542.1 F·g −1 , surpassing that of pristine Ti 3 C 2 T x (305 F·g −1 ), with a minimal degradation of only 3.4 % after 5000 charge-discharge cycles. This research offers valuable insights into the electrochemical behavior of GaOOH/Ti 3 C 2 T x composites and highlights the role of GaOOH in enhancing the performance of these materials. The results underscore the potential of combining metal hydroxides with MXenes for advanced supercapacitor applications.
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INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
·
2025
·
IF 8.3
Xiangjun Liu,Jingjing Ma,Shuai Zhang,Guo-Wei Guan,Qing-Yuan Yang,Junqi Wang
Harvesting solar energy to drive highly efficient photocatalytic conversion of renewable biomass to value-added chemicals and H 2, is a green and promising strategy to acquire clean H 2 with high energy density. In this study, CdS nanoparticles/Ti 3 C 2 T x nanosheets (Ti 3 C 2 T x /CdS composites) photocatalysts were prepared by a hydrothermal strategy. With an optimized Ti 3 C 2 T x loading of 0.8 wt%, the Ti 3 C 2 T x /CdS composites exhibited a significant enhancement in the photocatalytic H 2 evolution reaction with long-term stability, reaching 20,427 μmol·g −1 ·h −1 , compared to the pristine CdS (1,999 μmol·g −1 ·h −1 ). The Ti 3 C 2 T x /CdS-0.8 reflects appropriate electronic band structure and excellent conductivity, resulting in efficiently generation and migration of photoinduced electrons. In addition, the apparent quantum yield of Ti 3 C 2 T x /CdS-0.8 was 9.4% at 420 nm, higher than that of pristine CdS (1.2%). Superior results (7,164 μmol·h −1 ·g −1 ) were also achieved in the conversion of raw biomass to H 2 under natural sunlight. Achieving solar-driven H 2 production from biomass represents a significant step forward in contributing to sustainable and clean energy practices.
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TRIBOLOGY INTERNATIONAL
·
2024
·
IF 6.1
Ruisheng Guo,Zihan Liu,Xin Chen,Xiaoqiang Dou,Qian Ye,Xuqing Liu
Ti 3 C 2 T x MXene nanosheets are employed to graft ionic liquids via Michael addition or Schiff base reactions, with polydopamine acting as a bridging agent. This process creates a robust and synergistic tribological interface when the hybrids are used as lubricating additives in oil. The structural hybridization harnesses the high surface area and weak interlayer forces of MXenes, along with the thermal stability and film-forming capabilities of ionic liquids. The study reveals that lubricants fortified with these functionalized nanosheets exhibit a notable reduction in the average coefficient of friction from 0.188 to 0.112 and an 81.7% decrease in wear volume. These results highlight the untapped potential of structurally optimized, ionic liquid-functionalized MXenes as a transformative advancement in the field of tribology.
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ACS Applied Nano Materials
·
2020
·
IF 0
Fumei Yang,Yanqi Ge,Teng Yin,Jia Guo,Feng Zhang,Xian Tang,Meng Qiu,Weiyuan Liang,Ning Xu,Cong Wang,Yufeng Song,Shixiang Xu,Sanshui Xiao
MXenes, as an emerging group of two-dimensional materials, have attracted significant interest for diverse photoelectric applications by virtue of their tunable terminated surface, excellent electrical conductivity, and strong nonlinear optical response. They are usually synthesized via strategies involving hydrofluoric acid, which may result in oxygenic and hydrophilic termination groups on the MXene surface and thus decrease their stability in air. Herein, a mild synthesis method based on electrochemical exfoliation is proposed to prepare Ti3C2Tx MXene quantum dots (QDs), which are highly fluorinated to enhance stability. The open-aperture Z-scan system was employed to measure the nonlinear transmittance of the MXene QDs and proves their broadband saturable absorption from 540 to 1550 nm. By integrating the MXene QD saturable absorber into an ytterbium-doped fiber laser, a set of highly stable 357 ps mode-locked pulses centered at 1069.17 nm was achieved under a low threshold power of 54 mW. In addition, tunable mode-locked optical spectra could be observed in the cavity when switching the polarization state. This work provides an environmentally friendly approach to synthesize stable MXene QDs and opens an avenue for the realization of low-threshold and tunable photonics applications based on MXene QDs.
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SENSORS AND ACTUATORS B-CHEMICAL
·
2023
·
IF 8.4
Guinan Chen,Jiahao Li,Nanjun Li,Chenglong Guo,Peng Jin,Liangjun Chen,Yongwu Peng
Thermal bimorph actuators have important applications in artificial muscles, switches, and microsensors for robotics and biomimetic devices. To broaden the adaptability of environments, it is essential to fabricate thermal actuators with multiple stimulus responses, including electricity, near-infrared (NIR) light, and ultraviolet (UV) light, with fast and large deformations . Herein, a thermal actuator with programmable stimuli response was designed by combining silver nanowires (AgNWs) with Ti 3 C 2 T x MXene . Due to the synergistic effect of AgNWs with high plasmonic properties and electrical conductivity as well as Ti 3 C 2 T x MXene with good flexibility and photothermal properties, the obtained actuator can roll up for 2200° at a low driving voltage (2 V) and shows a fast response speed of 0.4 s for a bending angle of 360° under NIR light. More remarkably, the obtained thermal actuator can curl 360° in 1.2s under UV light which has never been reported before. We believe that such thermal actuators are attractive for a wide range of innovative technologies involving soft-bodied robots, intelligent grippers, bionic worms, and information cryptography.
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