Applied Materials Today
·
2020
·
IF 8.352
Gongchang Zeng,Ying Cao,Yixiao Wu,Haiguang Yuan,Biaojun Zhang,Yanling Wang,Heping Zeng,Shaobin Huang
Photocatalytic hydrogen evolution is a developing technology that addresses the urgent energy shortage, without greenhouse gas emissions. Despite tremendous efforts over the past decades, the achievement of high-efficiency hydrogen evolution rates for application in semiconductors remains very challenging because of various factors, which include low charge mobility, low light absorption, and high charge carrier recombination. Nowadays, the built-in electric field of metal-semiconductor Schottky junctions exhibits significant developments to overcome the aforementioned limitations because of the enhanced charge separation and transportation efficiency. However, noble metals are scarce and unaffordable to limit the applications. As a promising alternative, the Ti 3 C 2 nanosheets showed excellent metal conductivity which is fascinating. A new Cd 0.5 Zn 0.5 S/Ti 3 C 2 composite was fabricated as a non-noble metal-based Schottky junction photocatalyst with enhanced H 2 production performance. For a practical exploration, this study expands its application in the realistic environment of natural seawater, which is not only more in line with the sustainable concept but also greatly alleviates the issue of limited freshwater. At present, due to the complex composition of seawater, only a few studies focus on the H 2 production of seawater. Remarkably, based on the rational design of the Cd 0.5 Zn 0.5 S/Ti 3 C 2 Schottky catalyst, the observed H 2 production rate of 9.071 mmol g −1 h −1 is thirty-three times higher than that of traditional Pt assisted photocatalyst in seawater.
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高影响因子
COMPOSITES PART A-APPLIED SCIENCE AND MANUFACTURING
·
2022
·
IF 9.463
Kaili Gong,Lin Cai,Congling Shi,Feiyan Gao,Lian Yin,Xiaodong Qian,Keqing Zhou
It is a challenge to integrate organic and inorganic materials to build organic–inorganic hybrid, high-efficiency flame retardants with synergistic effects of both to diminish the fire risks of polymer composites . In this work, an organic–inorganic hybrid strategy was used to prepare leaf-like MXene-based flame retardants (MXene@Bi-MOF) by in situ growth of bimetallic metal–organic frameworks (Bi-MOF) on the surface of MXene and the hybrids were incorporated into epoxy resins to explore their flame retardancy and smoke suppression effects. Specifically, the introduction of MXene@Bi-MOF hybrids not only achieved homogeneous dispersion in EP matrix, but also improved the thermal properties of EP composites, with a 27.7% lower maximum mass loss rate ( R max ) than that of pure EP. In addition, EP composites containing 2 wt% MXene@Bi-MOF exhibited improved fire safety, reduced heat release and inhibited smoke production, as evidenced by a 28.8%, 45.3%, 36.5%, 30.7% and 55.3% drop in peak heat release rate (PHRR), peak smoke production rate (PSPR), total heat release (THR), peak CO production rate (PCO) and smoke factor (SF) value, respectively, as well as growing char yields and lower fire growth index (FGI) value, compared to those of pristine EP. The synergistic action of MXene and Bi-MOF, mainly including the blocking effect of MXene lamellar structure , catalytic carbonization effects as well as catalytic attenuation of the transition metal oxides and gas phase dilution from Bi-MOF, was primarily responsible for the improved fire safety of EP composites.
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JOURNAL OF POWER SOURCES
·
2020
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IF 8.247
Yangyang Luo,Yapeng Tian,Yi Tang,Xingtian Yin,Wenxiu Que
Constructing multifunctional hierarchical nanocomposites is a promising strategy for enhancing the structural stability and electrochemical reaction kinetics of electrode materials . Herein, the two-dimensional (2D) hierarchical NiCoS/d-Ti 3 C 2 composite is successfully synthesized through a co-precipitation and in situ sulfuration process, and shows interconnected porous network of NiCoS nanoplates on 2D d-Ti 3 C 2 nanosheets . Interconnected porous network of NiCoS nanoplates can provide large surface area and rich open pores, thus leading to much redox reaction sites, while 2D d-Ti 3 C 2 nanosheets with high conductivity can not only act as conductive channels for charge transfer rapidly, but also alleviate volume change of NiCoS. Benefited from the synergistic interaction between two components, the NiCoS/d-Ti 3 C 2 composite electrode exhibits an enhanced specific capacity of 758.9 C g −1 at a current density of 1 A g −1 and good rate capability. The assembled hybrid supercapacitor (HSC) by using NiCoS/d-Ti 3 C 2 composite as positive electrode and activated carbon (AC) as negative electrode delivers a high energy density of 22.6 Wh kg −1 at the power density of 0.4 kW kg −1 based on the total mass of active materials, and shows a good cycling stability. Our work provides a prospective and feasible strategy for the fabrication of hierarchical transition metal sulfides-based composites for high-performance supercapacitors .
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ACS Applied Materials & Interfaces
·
2022
·
IF 10.383
Yijun Gao,Ping Xue,Lijun Ji,Xin Pan,Lining Chen,Wei Guo,Mi Tang,Chengliang Wang,Zhengbang Wang
Conjugated quinones are promising cathode materials for sodium-ion batteries. However, the contemporary primary conjugated quinones cathodes still hold to limited capacity, poor rate performance and low cyclability, due to the poor electronic and ionic conductivity. Herein, a series of high-performance conjugated-quinones@MXene hybrid cathodes is constructed by an in situ polymerization-assembly strategy based on the hydrogen bond and S–Ti interaction. The PAQS@Ti3C2Tx MXene hybrid, as a typical example, exhibits sandwiched structure with intimate PAQS@MXene contact, resulting in efficient interfacial mass transfer. The assembled MXene is able to build interconnected conductive channels in the hybrid cathodes for continuous and fast electrons/ions transport, which is verified by both the experimental results and density functional theory (DFT) calculations. As a result, the optimal PAQS@MXene hybrid electrode delivers excellent electrochemical performances with high capacity (∼242 mA h g–1 at 100 mA g–1), superior fast-charge/discharge ability (∼148 and 121 mA h g–1 at 5 and 10 A g–1, respectively), and ultralong cycle life (capacity as high as 57 mA h g–1 after 9000 cycles at 5 A g–1), which are more superior to that of the pure PAQS electrodes. Besides, the analogous PPTS@Ti3C2Tx MXene hybrid cathode also shows better performances compared to the pure materials.
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PubMed
高影响因子
ACS Applied Materials & Interfaces
·
2021
·
IF 9.229
Zhiming Deng,Pingping Tang,Xinyu Wu,Hao-Bin Zhang,Zhong-Zhen Yu
Although hydrophilic and electrically conductive transition-metal carbon/nitride (MXenes) nanosheets hold great promise for electrically conductive and electromagnetic interference (EMI) shielding applications, the weak interaction among MXene nanosheets makes them difficult to form compressible three-dimensional architectures with high conductivity. Herein, inspired by the plant “Parthenocissus tricuspidata”, an efficient approach is demonstrated to fabricate conductive and lightweight Ti3C2Tx MXene/acidified carbon nanotube anisotropic aerogels (MCAs) with superelasticity and high thermal insulation. The MXene nanosheets construct the anisotropic and porous skeleton, while the acidified carbon nanotubes reinforce the pore walls of MXene nanosheets, making the MCAs superelastic and compressible. The superelastic MCA with only 5 wt % of the acidified carbon nanotubes is structurally stable during cyclic compressions at both high and ultralow temperatures. Its high conductivity (447.2 S m–1) and ultralow density (9.1 mg cm–3) endow its paraffin composite with a high EMI shielding efficiency of ∼51 dB at an ultralow filler content of 0.3 vol %. When the density of MCA increases to 18.2 mg cm–3, its EMI shielding effectiveness reaches 90 dB. Additionally, the porous and ultralight MCAs exhibit better thermal insulation performances as compared to commercial melamine and polystyrene foams. Therefore, the superelastic, electrically conductive, lightweight, and thermally insulating MCAs would be promising for EMI shielding applications in space equipment and portable wearable devices.
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PubMed
高影响因子
ChemElectroChem
·
2022
·Vol. 9
·期 22
·e202200715
·
IF 4.782
Wei-Xiang Cheng,Yi-Zhao Chen,Song-Yi Liao,Jun-Qi Hu,Cun-Sheng Liu,Shuai-Fu Cui,Xing-Wen Huang,Yidong Liu,Yonggang Min
Graphical NIB news : MoS 2 anchored on nitrogen-doped MXene nanosheets with carbon coating were prepared and applied in Na-ion batteries (NIBs). It remained at ∼308 mAh g −1 at 0.5 A g −1 after 300 cycles and showed higher rate performance of ∼189 mAh g −1 at 4 A g −1 . The MoS 2 @N-MXene/C heterogeneous nanosheets showed enhanced pseudocapacitance effects of 84.5 % at a scan rate of 2 mV s −1 according to CV curves simulation. Currently, Na-ion batteries (NIBs) have emerged as a new generation of energy storage devices. However, due to the lack of suitable anode materials, the large-scale practical application of NIBs is still greatly limited. Therefore, to address this issue, an effective strategy towards an advanced NIBs anode was developed by achieving MoS 2 anchored on nitrogen-doped MXene nanosheets with carbon coating (shorten as MoS 2 @N-MXene/C). The structure, surface chemistry state and micromorphology of MoS 2 @N-MXene/C were carefully analyzed and characterized by XRD, XPS and SEM/TEM, respectively. It was shown that MoS 2 was loaded on N-MXene to form a heterogeneous nanosheets structure. When applied to the anode of NIBs, MoS 2 @N-MXene/C delivered ∼189 mAh g −1 at 4 A g −1 and remained at ∼308 mAh g −1 after 300 cycles at 0.5 A g −1 . Moreover, based on the simulation and calculation from CV curves, the enhanced electrochemical performances of MoS 2 @N-MXene/C was assigned to its high pseudocapacitance-dominated contribution (84.5 % at a scan rate of 2 mV s −1 ). Therefore, owing to the highly conductive N-MXene and the actively anchored MoS 2 , MoS 2 @N-MXene/C could effectively provide efficient channels for charge transfer and ionic diffusion. The presented design strategy may provide a guidance for developing more-efficient NIBs anode.
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ACS Applied Energy Materials
·
2021
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IF 6.024
Yangyang Wang,Xue Wang,Bingcheng Ge,Jianxin Guo,Carlos Fernandez,Qiuming Peng
The Li–CO2 battery is a potential energy storage device that not only possesses a theoretical energy density as high as 1876 W h kg–1 but also alleviates the consumption of fossil resources by converting the greenhouse gas CO2 into electric energy. However, some technique bottlenecks, such as high overpotential, low recyclability, and low energy density, severely prohibit its application rhythm. Here, we prepare a binder-free MXene–MnO2 composite film using vacuum-assisted filtration and in situ reduction, which can be used as a freestanding cathode for Li–CO2 batteries. This MXene–MnO2 film electrode bestows good cycle stability (∼220 cycles), high specific capacity, and lower overpotential (∼0.89 V) in Li–CO2 batteries. Both experimental tests and first-principles calculations reveal that the enhanced electrochemical properties are associated with three aspects. First, the MXene–MnO2 film offers a high electrical conductivity and porous structure, which provide fast transport channels for electrons and ions. Then, the replacement of Mn by Ti increases the adsorption of Li ions, which facilitates the rapid decomposition of Li2CO3. Finally, the synergistic effect of MXene and MnO2 exposes a large number of active sites, which increases the capacity of Li–CO2 batteries. Therefore, this self-supporting strategy on the MXene composite paves a way to develop high-performance Li–CO2 batteries.
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高影响因子
JOURNAL OF MEMBRANE SCIENCE
·
2022
·
IF 10.53
Qinsheng Wang,Yiyi Fan,Chengliang Wu,Yun Jin,Claudia Li,Jaka Sunarso,Xiuxia Meng,Naitao Yang
Research on gas separation membrane has targeted upon maximizing the selectivity and permeance. The development of 2D materials ( e.g. , MXene) gives a novel avenue to surpass the “trade-off” among the membrane selectivity and permeability. However, randomly stacked nanosheets and the regulation of interlayer spacing for MXene nanosheets hinder the development of MXene membrane. To this end, we designed a Pd-intercalated lamellar MXene membrane to modify the surface chemical properties (H-spillover effect) of MXene (Ti 3 C 2 T x ) and to expand the interlayer spacing (from 2.29 to 3.26 Å) due to the strong interaction between Pd 2+ and MXene nanosheets with negative charge. Here, we performed a single-step etching approach to prepare 2D Pd-MXene membrane and demonstrated its excellent H 2 permeability of 2.66 × 10 −7 mol m −2 s −1 ·Pa −1 and H 2 /CO 2 selectivity of 242 at 25 °C, which greatly exceeds the current benchmark membranes. We also developed single gas transport mathematical mechanism models to interpret and support the experimental results. The combined experimental and modeling results show that interlayer spacing and H-spillover effect of Pd-MXene membrane benefit H 2 /CO 2 separation.
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高影响因子
JOURNAL OF MATERIALS SCIENCE
·
2022
·Vol. 57
·期 29
·13962-13973
·
IF 4.682
Wang Yifan,Wan Yuqin,Meng Xiangqi,Jiang Lei,Wei Hao,Zhang Xinyue,Ma Ning
Solar energy, as an endless clean energy, has great prospects for the use of water vapor from sewage purification and seawater desalination. Local heating of surface water has shown to maximize the energy efficiency of steam generation. Therefore, at first, the material is required to have a good ability of photo-thermal conversion. Among the photo-thermal converting materials, MXenes are arising candidates for effective photo-thermal conversion, which have shown excellent photo-thermal conversion efficiency and have been attempted for photo-thermal distillation. Although a high photo-thermal conversion efficiency has been realized, however, it is more challenging to prepare photo-thermal evaporating materials with rapid water transport capacity and generating solar steam. In this work, a photo-thermal distillation device was reported by combining a chitosan aerogel with a bio-inspired wood-like oriented porous structure prepared by directional freezing method, and Ti 3 C 2 T x two-dimensional nanosheets coated with polyethyleneimine sprayed on the surface. The ordered microporous structure can quickly transport moisture from the bottom up to the evaporation surface by capillary force. The coating of Ti 3 C 2 T x coated with polyethyleneimine on the evaporation surface has a strong ability to capture sunlight. The evaporation rate reaches 3.99 kg m −2 h −1 under the optical power density of 3000 W m −2 and the efficiency reaches 90%, indicating the broad application prospects as a photo-thermal conversion material for efficiently producing clean fresh water. Graphical abstract
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ACS Applied Polymer Materials
·
2022
·
IF 4.855
Chenguang Jiang,Wenyuan Xie,Defeng Wu
Solvent replacement is an effective strategy to improve the freezing resistance of hydrogels. The physicochemical properties of those organics are key to the overall performance of as-obtained organohydrogels. In this work, we performed a comparative study to explore the relationships between the types of solvents with similar chemical structures and the intrinsic properties of the organohydrogels. Poly(vinyl alcohol)/MXene composite hydrogel was used as a template, and three types of alcohols (ethanol, ethylene glycol, and glycerol) were used as exchange solvents. A “2-varible/5-outputs” method was developed, and the overall performance of as-obtained organohydrogels was optimized in terms of alcohol types and weight retention ratios. The organohydrogel containing ethanol with 50% weight retention ratio showed balanced properties: optimized modulus and good strength, superior compliance and recovery efficiency, high strain sensitivity, and wide detection range, which was more suitable to detect human motions. This work can provide valuable information on fabricating organohydrogels with optimized overall properties for flexible strain sensors.
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高影响因子
JOURNAL OF HAZARDOUS MATERIALS
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2020
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IF 9.038
Bin Yu,Anthony Chun Yin Yuen,Xiaodong Xu,Zhen-Cheng Zhang,Wei Yang,Hongdian Lu,Bin Fei,Guan Heng Yeoh,Pingan Song,Hao Wang
High-performance MXene-based polymer nanocomposites are highly desirable for diverse industry applications due to their exceptional mechanical, thermal and other properties. Nevertheless, it remains an intractable challenge to create flame retardant polymer/MXene nanocomposites due to the difficulty to achieve uniform dispersion of MXenes. Here, we reported a facile strategy for the surface manipulation of two-dimensional titanium carbide nanosheets (Ti 3 C 2 T x ) with 3-aminopropylheptaisobutyl-polyhedral oligomeric silsesquioxane (AP-POSS) (POSS-Ti 3 C 2 T x ) through electrostatic interactions. The POSS-Ti 3 C 2 T x is steadily dispersed in many polar solvents. Upon incorporated into polystyrene (PS), the combined effect of AP-POSS and MXene makes the resultant PS nanocomposites exhibit significantly improved thermal and thermoxidative stability, e.g. 22 °C and 39 °C increases in the temperature at 5 wt% mass loss under nitrogen and air, respectively. Meanwhile, a 39.1 % reduction in the peak heat release rate, a respective 54.4 % and 35.6 % reduction in the peak CO production rate and the peak CO 2 production rate was achieved, which are superior to those of its own and previous counterparts. This outstanding fire safety is attributed to the combination of adsorption, catalytic and barrier effects of POSS-Ti 3 C 2 T x . Hence, as-designed functionalized MXenes can be effectively applied in PS to formulate multifunctional polymer nanocomposites attractive for wide potential applications.
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高影响因子
INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER
·
2022
·
IF 5.431
Zhenqiang Ye,Chao Ji,Tao Yu,Rong Sun,Xiaoliang Zeng,Bingyang Cao
Thermal interface materials (TIMs) are indispensable materials in thermal management, and Al 2 O 3 -based TIMs are most widely used in thermal managements. Surface modification is an effective method to improve Al 2 O 3 dispersion in matrix, thereby increasing the maximum filler loading. However, traditional surfactants hardly promote the interfacial heat-transfer on the premise of the same filler loading. In this work, we proposed an electrostatic self-assembly strategy to functionalize the surface of Al 2 O 3 particles with MXene sheets to enhance the interfacial heat-transfer between fillers and silicone rubber (SR). To validate the effectiveness of MXene, we compared the Al 2 O 3 -MXene-SR TIM with Al 2 O 3 -graphene-SR TIM and Al 2 O 3 -SR TIM under the same Al 2 O 3 loading in the aspects of mechanical properties and thermal properties. Though MXene could increase the viscosity and hardness, the negative influence of MXene is much weaker than that of graphene. Nevertheless, the positive impact of MXene is more significant. First, it can reinforce the mechanical strength. The experiment showed the breaking tensile strength of the Al 2 O 3 -MXene-SR TIM is 0.117 MPa, higher than that of the Al 2 O 3 -graphene-SR TIM (0.082 MPa) and the Al 2 O 3 -SR TIM (0.07 MPa). Second, the thermal conductivity of TIMs improves a lot after MXene coating. The thermal conductivity of Al 2 O 3 -MXene-SR TIM is 3.4 W·m −1 ·K −1 , with the matrix/filler mass ratio of 100:1600, which is 30% higher than that of the Al 2 O 3 -SR TIM (2.6 W·m −1 ·K −1 ) and 21% higher than that of Al 2 O 3 -Gr-SR TIM (2.8 W·m −1 ·K −1 ). Whereas the Al 2 O 3 loading keeps the same and the MXene fraction is only about 1.16 vol‰, the increment of the thermal conductivity is mostly due to the improvement of interfacial heat-transfer via MXene. The temperature cycling test and aging test implied that the Al 2 O 3 -MXene-SR TIM is thermally stable and reliable. The underlying mechanism of the interfacial heat-transfer enhancement was revealed by the analysis of phonon density of states (PDOS) via a molecular dynamics simulation. The PDOS of MXene is more compatible with Al 2 O 3 and SR than graphene, so MXene sheets play the role as a bridge between Al 2 O 3 and SR to improve the interfacial phonon transport. This work provides an effective method to reduce interfacial thermal resistance in TIMs, which could facilitate the development of thermal management materials.
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危险品化学品经营许可证（带存储）