ChemSusChem
·
2024
·
IF 7.5
Chen Liao,Hongwei Zhou,Shunxin Zhang,Feng Wang,Ya Liu,Liejin Guo
Graphical A highly effective photocatalytic system (V Cu −CuInS 2 /MXene) was developed for transforming CO 2 into acetate under full spectrum irradiation. The incorporation of the LSPR effect and defect engineering leads to a highly selective system. Photocatalytic CO 2 conversion towards C 2+ fuels is a promising technology for simultaneously achieving carbon neutrality and alleviating the energy crisis. However, this strategy is inefficient due to the difficulty of both multi-electron transfer and C−C coupling during C 2+ formation. In this work, CuInS 2 /MXene heterostructure with Cu vacancy is rationally designed by in situ hydrothermal synthesis. The V Cu −CuInS 2 /MXene heterostructure has a suitable band structure and tight interface contact. Catalytic performances under different testing conditions, in situ spectroscopy, and COMSOL simulation reveal that LSPR-activated MXene promotes the formation of crucial intermediate CH 2 * and triggers the C−C coupling process under near-infrared light, as the key to acetate. Moreover, in situ XPS analysis, DFT calculations, and photoelectrochemical characterizations unveil that copper vacancy can promote charge transfer from CuInS 2 to MXene and boost local electron aggregation on the MXene, further enhancing the photocatalytic efficiency and selectivity of C 2 products. Contributing to the synergistic effect of copper vacancy and plasmonic MXene, V Cu −CuInS 2 /MXene achieved excellent CO 2 RR activity with an acetate evolution rate of 250.0 μmol/h/g and a selectivity of 97.5 % under the full spectrum irradiation, which is 38.8 and 3.3 times higher than that of V Cu −CuInS 2 and CuInS 2 /MXene, respectively.
研究领域:
材料科学
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环境科学
·
化学
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产品关联
DOI
PubMed
高影响因子
ACS Sustainable Chemistry & Engineering
·
2020
·
IF 7.632
Jiangzhou Qin,Baojun Liu,Kwok-Ho Lam,Shijie Song,Xinyong Li,Xia Hu
To improve the photocatalytic efficiency of the N2 reduction reaction, MXene quantum dots (Ti3C2-QDs) and two-dimensional (2D) nickel metal–organic framework (Ni-MOF) with different ratios were fabricated by a simple self-assembly strategy to form type II heterojunctions. The resultant composites showed enhanced absorption and excellent interfacial charge-transfer capabilities according to the optical and photoelectron properties. The optimal Ti3C2-QD/Ni-MOF heterostructure exhibited a considerable ammonia yield rate (88.79 μmol gcat–1 h–1). By means of X-ray absorption near-edge fine structure (XANES) technique, it was found that the interaction of Ti3C2-QD and Ni-MOF could accelerate the electron transfer, and Ni site would be the main area to enrich the electron density as well as adsorb and activate N2. Finally, with the aid of density functional theory (DFT) calculations and in situ Fourier transform infrared spectrometry (FTIR), the reaction pathway and intermediate products were studied.
研究领域:
材料科学
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环境科学
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化学
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产品关联
DOI
高影响因子
APPLIED SURFACE SCIENCE
·
2019
·
IF 5.155
Jun He,Sheng Liu,Lianwen Deng,Dongyong Shan,Can Cao,Heng Luo,Shuoqing Yan
Ti 3 C 2 MXene has demonstrated to be a potential microwave absorber if some difficulties, e.g., poor impedance matching and lack of magnetic loss, can be well-solved. In this paper, laminated Ti 3 C 2 MXene was synthesized using the HF etching method. CoFe 2 O 4 nanoparticles-decorated Ti 3 C 2 MXene (CoFe 2 O 4 -Ti 3 C 2 ) composites were then fabricated via a novel in-situ solvothermal process. The incorporation of CoFe 2 O 4 nanoparticles on the electromagnetic (EM) and microwave absorption properties of Ti 3 C 2 MXene were systematically studied over 2–18 GHz. Interestingly, increased percolation threshold and controlled complex permittivity were well-observed in the CoFe 2 O 4 -Ti 3 C 2 composites. Furthermore, additional magnetic loss due to the existence of magnetic CoFe 2 O 4 was easily obtained. Benefiting from tunable electromagnetic properties, the minimum reflection loss (RL) value of the CoFe 2 O 4 -Ti 3 C 2 -filled absorbing coating achieved −30.9 dB with a matching thickness of only 1.5 mm. A wide effective absorption bandwidth (RL < −10 dB) of 8.5 GHz was correspondingly realized. These results demonstrated that the CoFe 2 O 4 -Ti 3 C 2 composites are favorable as a broadband microwave absorbent.
研究领域:
材料科学
·
电磁学
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产品关联
DOI
高影响因子
CHEMICAL ENGINEERING SCIENCE
·
2023
·
IF 4.7
Mide Luo,Yali Zhao,Yanying Wei,Haihui Wang
Construction of large-area two-dimensional (2D) nanosheet membranes for gas separation, particularly tubular membranes, is extremely challenging. Here, electrophoretic deposition technology was employed to construct large-area tubular 2D MXene membranes for H 2 /CO 2 gas separation, where the membrane with a single tube area of 25 cm 2 could be successfully manufactured in approximately 5 min under optimal process conditions. The membrane exhibited good H 2 /CO 2 separation performance with H 2 /CO 2 selectivity of 53.0 and hydrogen permeance of 133.8 GPU, exceeding the 2008 Robeson upper bound, and showed excellent stability in long-term test with water vapor evaluations for more than 350 h. Additionally, some engineering issues and operation parameters concerning the separation performance of H 2 /CO 2 in single-module and dual-module separators have been thoroughly investigated and analyzed. This work has taken an important step toward the industrialization of 2D MXene membranes and also provided significant guidance to other 2D material-based membranes in approaching practical applications.
研究领域:
材料科学
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化学工程
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产品关联
DOI
高影响因子
COLLOIDS AND SURFACES B-BIOINTERFACES
·
2022
·
IF 5.999
Miao Qin,Wenfeng Yuan,Xiumei Zhang,Yizhu Cheng,Mengjie Xu,Yan Wei,Weiyi Chen,Di Huang
Conductive hydrogels based on MXene have gained more attention due to the excellent conductive property and biocompatibility. At present, they have great potential in electronic skins, personally healthcare monitoring and human motion sensing. However, MXene are prone to be oxidized due to the abundant hydroxyls , which results in the unstable conductive property of hydrogel. To improve the shortcoming, conductive PAA/PAM/MXene/TA hydrogel was prepared, in which the introduction of TA can prevent MXene from oxidation owing to the great deal of pyrogallol groups. Mechanical tests showed that the tensile strength , toughness and elongation at break of PAA/PAM/MXene/TA hydrogel are 0.251 ± 0.05 MPa, 0.895 ± 0.16 MJ/m 3 and 560.82 ± 19.56%, respectively, indicating the hydrogel possess good stretchability. In addition, the MXene and TA were introduced into hydrogel through hydrogen bonds , which endow the hydrogel with good restorability and self-healing property. Resistance variation-strain curves demonstrated that the introduction of MXene endue the hydrogel with appreciable sensing performances. Moreover, in vitro cytotoxicity assay indicated that the hydrogel has good biocompatibility. In conclusion, PAA/PAM/MXene/TA hydrogel has great potential in flexible wearable sensor field.
研究领域:
材料科学
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纳米技术
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生物医学工程
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传感器
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产品关联
DOI
PubMed
高影响因子
PROCESS SAFETY AND ENVIRONMENTAL PROTECTION
·
2024
·
IF 6.9
Hao Liang,Nana Wang,Wei Tian,Hongping Zhang,Cuicui Li,Ruibin Guo,Zunli Mo,Nijuan Liu
Uranium extraction from unconventional uranium resources is among the major constraints to the development of the nuclear industry at present. In this dissertation, we here propose to effectively graft amidoxime groups on magnetic MXene and chitosan (CS) composites to extract uranium from low-enriched uranium solutions (MCF-AO). The data of adsorption experiments displayed that MCF-AO possessed fast adsorption kinetics (within 120 min), outstanding selectivity and salient adsorption capacity (1305.7 mg/g at pH=4, T=298.15 K) for uranium and could be easily separated with a magnet. Adsorption studies revealed a behavior consistent with the pseudo-second-order kinetic model and the Langmuir adsorption isotherm model, which is suitable for the spontaneous heat-absorption chemical monolayer adsorption process . Its sorption remains at more than 55 % of the original after 5 adsorption-desorption tests, and has great tolerance to interfering ions. Mechanistic research pointed out that the selective adsorption of uranium by MCF-AO was significantly enhanced by the presence of hydroxyl, amino and amidoxime groups. Meanwhile, MCF-AO exhibited superb resistance to two common bacteria (E. coli and B. subtilis ) and achieved more than 95 % uranium extraction capacity in simulated seawater , even more 4.12 mg/g of uranium extraction in Salt Lake water. Consequently, MCF-AO has a broad application prospect in the recovery and treatment of complex uranium systems.
研究领域:
材料科学
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环境科学
✓ 已验证
DOI
高影响因子
Polymers
·
2025
·Vol. 17
·期 9
·1229
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IF 4.9
Mengke Jing,Shujie Zhang,Sichang Zhang,Mingzhou Li,Fan Chen,Yuchen Ma,Bo Sun
This work focuses on the hydrothermal aging of two-dimensional layered Ti3C2Tx(MXene)/epoxy (EP) nanocomposites. MXene/EP composites were successfully prepared by homogeneously dispersing multilayer MXene (m-MXene) and few-layer MXene (f-MXene) into the curing agent, methyl nadic anhydride (MNA). Considering the application, the MXene loading was designed to be 0.1 wt.%. Characterization included the characteristics of MXene, the water absorption behavior of the resin and composite samples, the glass transition temperatures (Tg) in various states, and the tensile strength evolution during aging. The curing behavior of the MXene composites was also discussed to facilitate an understanding of the processability. The results showed that MNA can chemically bond with MXene to obtain a stable suspension. The addition of MXene increased the curing characteristic temperature of the system, but the change in the activation energy of the curing reaction was minimal. The addition of MXene decreased the crosslink density of the epoxy resin, leading to a decrease in theTgvalue of the initial samples. After hydrothermal aging, theTgof pure EP decreased by 46.9 °C, and re-drying the samples did not fully restore theTg. However, theTgof the MXene/EP system decreased by only 8.9 °C (m-MXene) and 9.5 °C (f-MXene), respectively, and theTgvalues of the samples were fully restored to their pre-aging levels via re-drying. Experiments with immersion at 25 °C and 100 °C showed that the difference in water absorption behavior between the MXene/EP and pure EP systems was minimal. Tensile tests showed that the addition of MXene increased the initial strength of the resin system by 14.7% (m-MXene) and 20.9% (f-MXene). After 400 h of hydrothermal aging, the tensile strength retention of the pure EP samples was 69.1%, while the strength retention of the MXene/EP samples was 85.3% (m-MXene) and 83.0% (f-MXene). The combined results demonstrate that the addition of MXene with a low loading of only 0.1% can effectively improve the hydrothermal resistance of epoxy resins.
研究领域:
材料科学
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复合材料
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化学工程
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Nano-Micro Letters
·
2024
·Vol. 16
·期 1
·1-17
·
IF 31.6
Yu Weiyan,Yang Yi,Wang Yunjing,Hu Lulin,Hao Jingcheng,Xu Lu,Liu Weimin
A low-strength-centrifugation-assisted approach for rapid gelation of Ti 3 C 2 T x MXene with a very low dispersion concentration into multifunctional 3D architectures is developed.
On the basis of pH-induced surface termination changes, the MXene gels exhibit reconfigurable internal structures and tunable rheological, tribological, electrochemical, infrared-emissive and photothermal-conversion properties.
By adopting a gel with optimized pH value, high lubrication, remarkable capacitance, long-term capacitance retention and high-precision screen- or extrusion-printing into high-resolution anticounterfeiting patterns can be achieved.
研究领域:
材料科学
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化学工程
·
纳米技术
✓ 已验证
产品关联
DOI
PubMed
高影响因子
MOLECULES
·
2024
·Vol. 29
·期 8
·1731
·
IF 4.2
Minghua Chen,Qi Fan,Ping Yu,Ke Chen,Peng Li,Kun Liang
Exploiting novel materials with high specific capacities is crucial for the progress of advanced energy storage devices. Intentionally constructing functional heterostructures based on a variety of two-dimensional (2D) substances proves to be an extremely efficient method for capitalizing on the shared benefits of these materials. By elaborately designing the structure, a greatly escalated steadiness can be achieved throughout electrochemical cycles, along with boosted electron transfer kinetics. In this study, chemical vapor deposition (CVD) was utilized to alter the surface composition of multilayer Ti3C2TxMXene, contributing to contriving various layered heterostructure materials through a precise adjustment of the reaction temperature. The optimal composite materials at a reaction temperature of 500 °C (defined as MX500), incorporating MXene as the conductive substrate, exhibited outstanding stability and high coulombic efficiency during electrochemical cycling. Meanwhile, the reactive sites are increased by using TiS2and TiO2at the heterogeneous interfaces, which sustains a specific capacity of 449 mAh g−1after 200 cycles at a current density of 0.1 A g−1and further demonstrates their exceptional electrochemical characteristics. Additionally, the noted pseudocapacitive properties, like MXene materials, further highlight the diverse capabilities of intuitive material design. This study illuminates the complex details of surface modification in multilayer MXene and offers a crucial understanding of the strategic creation of heterostructures, significantly impacting sophisticated electrochemical applications.
研究领域:
材料科学
·
能源存储
✓ 已验证
产品关联
DOI
PubMed
高影响因子
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.
研究领域:
材料科学
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摩擦学
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纳米技术
✓ 已验证
产品关联
DOI
高影响因子
CHEMICAL ENGINEERING SCIENCE
·
2025
·
IF 4.3
Changdie Cao,Yurun Dai,Zhihao Liu,Zong Lu,Mide Luo,Yanying Wei,Haihui Wang
Two-dimensional (2D) nanosheet membranes presented excellent gas separation performance, which has attracted increasing attention. The electrophoretic deposition (EPD) method provides a fast and scalable route for the preparation of 2D nanosheet membranes aimed at future industrial applications. However, the formation of bubbles via water electrolysis during EPD would damage the membrane structure, and the expansion of interlayer spacing would hinder its utilization. Herein, the solvent-mediated structural regulation strategy for MXene membrane preparation via EPD is proposed for H 2 purification. The effect of various organic solvents on the EPD-prepared MXene membrane structure and gas separation performance has been investigated. Notably, the MXene membranes deposited using acetone as solvent exhibit outstanding gas separation performance, boasting an H 2 /CO 2 selectivity of 374 with a H 2 permeance of 748 GPU for at least 450 h. This work offers a novel approach to fast fabricating 2D nanosheet membranes with outstanding gas separation performance
研究领域:
材料科学
·
化学工程
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产品关联
DOI
高影响因子
JOURNAL OF CHEMICAL PHYSICS
·
2024
·Vol. 161
·期 7
·
IF 3.1
Wang Zhenjiang,Yang Xinli,Wang Gang,Yang Xiping,Qiao Longhao,Lu Mingxia
Three-dimensional (3D) reduced graphene oxide (rGO)/Ti 2 CT x MXene hybrid aerogels were effectively prepared by a two-step method involving hydrothermal reaction and freeze-drying. The intimately coupled rGO/Ti 2 CT x hybrid aerogel combined high electrical conductivity, large interlayer spacing, and excellent mechanical stability of Ti 2 CT x , which not only effectively prevents the self-restacking of Ti 2 CT x nanosheets, exposes more active sites exposed, and improves the volume change during the charge/discharge process but also increases the accessibility of ions and promotes the rapid transfer of ions/electrons. As a result, rGO/Ti 2 CT x 17.5–2.5 as the working electrode of electric double layer capacitors delivers a large specific capacity (107.05 F g −1 at 0.5 A g −1 in a 1M Na 2 SO 4 electrolyte), a high rate capability (maintains 30% of its initial capacitance at 10 A g −1 , which is much better than rGO and Ti 2 CT x ), and excellent long-term large-current cycle stability (the initial capacitance remains above 71.1% after 10 000 cycles at 1 A g −1 ). In addition to providing a high-performance electrode for supercapacitors, this study proposes an efficient and time-saving strategy for constructing 3D structures from 2D materials.
研究领域:
材料科学
·
能源存储
✓ 已验证
产品关联
DOI
PubMed
高影响因子
危险品化学品经营许可证（带存储）