CARBON
·
2021
·
IF 9.594
Xiao Li,Caiyue Wen,Liting Yang,Ruixuan Zhang,Xiaohui Li,Yuesheng Li,Renchao Che
MXene , an emerging two-dimensional (2D) material, is widely used as a microwave absorber to defense the electromagnetic pollution in the high-frequency communication. However, how to reasonably reduce the excessive conductivity of the single-layer MXene itself remains a challenge. Herein, via vacuum-assisted filtration, a flexible MXene/FeCo film was prepared by the electrostatic interaction between negatively charged MXene and positively charged FeCo alloy. The continuous layered structure composed of single-layered MXene stacking was destroyed due to the intercalation of the magnetic nanoparticles , resulting in the reduced conductivity and proper impedance matching. Because of the anisotropy associated with different morphologies, the rough surface of nanoflower-like FeCo alloy has better interfacial polarization and magnetic loss capabilities that induced by the more active response sites, confirming by electron holography. The MXene-FeCo nanoflower-like film demonstrated better microwave absorption (MA) performance with the maximum RL value of −43.7 dB at 3.76 GHz, while the RL max reached −36.2 dB at 10.16 GHz of MXene-FeCo nanoplate-like film. Thus this effective frequency adjustment also expands the practical applications of absorbers to deal with different frequency of the outer microwave changes. It is expected that regulating morphology might shed new light on the absorbers designing with tunable MA performance.
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高影响因子
Nano-Micro Letters
·
2020
·Vol. 13
·期 1
·1-13
·
IF 12.264
Wu Wenting,Fang Huajing,Ma Hailong,Wu Liangliang,Zhang Wenqing,Wang Hong
MXene/WO 3− x composite film with excellent electrochromic performances was fabricated for the first time.
The addition of MXene is an effective strategy for simultaneously enhancing electron and ion transport behaviors in the electrochromic layer.
The kinetics of ion diffusion in electrochromic devices are studied in depth based on both experiment and simulation.
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PubMed
高影响因子
Nanoscale
·
2020
·Vol. 12
·期 41
·21325-21333
·
IF 6.895
Xing Chen,Jianjun Jiang,Guoyu Yang,Chuanbing Li,Yujun Li
MXenes, a new class of two-dimensional materials with excellent performance, are promising materials for wearable energy storage devices. However, the lack of sufficient interaction between various MXene particles makes it difficult to translate the exceptional performance from the nanoscale to macroscale. Additionally, the intrinsic characteristic of easy oxidation limits their practical applications. Herein, inspired by the structure of wood, a biomimetic core–shell MXene@graphene oxide (MX@GO) fiber was fabricated using GO as a mechanical layer to wrap MXenes. The GO layer could easily assemble MXene particles into macroscale materials and protect them from oxidation. Therefore, the as-fabricated core–shell MX@GO fiber showed a high tensile strength (290 MPa) and excellent electrical conductivity (2400 S m−1). Notably, the conductivity of the biomimetic fiber only decreased to 1800 S m−1 with a reduction of about 30% at 100 °C. This work paves the way to fabricate MXene-based fibers with freely designed functionalities and morphologies, which are suitable for various high-value fabric-based applications.
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PubMed
高影响因子
APPLIED SURFACE SCIENCE
·
2020
·
IF 6.182
Na Zhao,Yang Hu,Jinlong Du,Gang Liu,Bowei Dong,Yuying Yang,Jing Peng,Jiuqiang Li,Maolin Zhai
Developing non-noble-metal cocatalysts is essential for the large-scale implementation of solar-driven H 2 production technology, but still remains a great challenge. In this work, Ti 3 C 2 T x MXene coupled CdS nanostructures are fabricated via one-step gamma-ray radiation-induced reduction in ambient conditions. By subsequent alkaline treatment, a novel cocatalyst of carbon supported amorphous TiO 2 nanosheets (denoted as aTiO 2 -C) is derived from Ti 3 C 2 T x /CdS to form aTiO 2 -C/CdS nanocomposites. The prepared aTiO 2 -C/CdS nanocomposites with cyclability achieve a H 2 evolution rate of 1.48 mmol·g −1 ·h −1 under visible-light illumination, which is 6.4 and 7.0 times greater than that of pristine Ti 3 C 2 T x /CdS and P-CdS, respectively. The oxygen vacancies in aTiO 2 -C cocatalysts are revealed to act as electron trapping sites to facilitate the transfer of photoexcited electrons and boost photoactivity. Further, the electronic interaction between CdS and aTiO 2 -C prevents Cd 2+ from leaching and thus enhances photostability. The results of this work may guide the rational design of viable cost-effective cocatalysts in solar-to-chemical energy conversion and beyond.
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高影响因子
JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2020
·
IF 7.489
Huizhen Huang,Xuefeng Sha,Yi Cui,Shiyan Sun,Hongye Huang,Ziyang He,Meiying Liu,Naigen Zhou,Xiaoyong Zhang,Yen Wei
Herein a simple and novel approach has been developed for surface modification of delaminate MXene with nano-mixed silver oxide which combined with mussel-inspired chemistry. Surface modification with dopamine as a secondary reaction platform for loading nano-silver compounds for removal of iodine was achieved. The internal structure and morphology were characterized by SEM and TEM. The element content and distribution analysis of EDS and XPS proved that nano silver compounds were successfully supported and uniformly dispersed on the surface of MXene. Then the adsorption batch experiment was carried out, adsorption time, pH and other factors on the adsorption performance of the adsorbents were studied in details. By calculating the enthalpy change, Gibbs free energy and thermodynamic parameters, the adsorption reaction was found to be an exothermic process. The adsorption kinetics measured the maximum adsorption capacity of 80 mg/g and the removal efficiency is as high as 80% and the adsorption equilibrium time has also been improved. The adsorption kinetics were well fitted by pseudo first-order and second-order models. All the above results demonstrated that the composite from mussel-inspired chemistry has excellent adsorption properties towards iodine ions. This study not only deepens the research on the adsorption behavior of iodine adsorption, but also provides new research directions and experimental methods for pseudo-iodine adsorption.
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高影响因子
ENERGY
·
2020
·
IF 6.082
Fan Zhang,Zirui Jia,Chao Wang,Ailing Feng,Kuikui Wang,Tianqi Hou,Jiajia Liu,Yi Zhang,Guanglei Wu
Silicon has been regarded as a promising anode materials for lithium ion battery . However, large volume change during lithiation/delithiation process impedes its application for energy storage. Two-dimensional titanium carbide or carbonitride nanosheet , known as MXene , possesses layered-stacked structure and high electrical conductivity . So MXene has a great potential to improve the cycle life of silicon anode because its layered-stacked structure can accommodate the volume expansion of silicon. Herein, we present a facile process to prepare sandwich-like silicon/Ti 3 C 2 T x MXene composite directed by electrostatic self-assembly. This unique architecture could accommodate silicon expansion during lithiation and enhance electronical conductivity. The silicon/Ti 3 C 2 T x MXene composite delivers an initial reversible capacity of 1067.6 mAh g −1 at a current of 300 mA g −1 . Moreover, it shows a steady cycling ability of 643.8 mAh g −1 at 300 mA g −1 after 100 cycles. This work may shed lights on the development of high energy density silicon-based anode materials for lithium ion battery.
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高影响因子
CERAMICS INTERNATIONAL
·
2020
·
IF 3.83
Yitong Guo,Sen Jin,Libo Wang,Pingge He,Qianku Hu,Li-Zhen Fan,Aiguo Zhou
In this study, highly pure Mo 2 CT x MXene was successfully synthesized from Mo 2 Ga 2 C by etching in hydrothermal conditions for 24 h at 140–180°C. The etching solutions were lithium fluoride (LiF), sodium fluoride (NaF), potassium fluoride (KF) or ammonium fluoride (NH 4 F) mixed with hydrochloric acid (HCl). The temperature to obtain pure Mo 2 CT x MXene in NH 4 F + HCl solution was 140°C, lower than that in other etching solutions. The thickness of as-prepared monolayer Mo 2 CT x nanosheet was measured to be 1.5 ± 0.3 nm by atomic force microscope. From thermogravimetry and differential thermal analysis, Mo 2 CT x MXene was found to be stable in argon atmosphere at a temperature of up to 500°C. As the temperature increased, Mo 2 CT x MXene gradually transformed, and β-Mo 2 C/MoC/Mo 3 C 2 was eventually formed to coexist with Mo 2 CT x MXene at 700°C. In air atmosphere, Mo 2 CT x MXene was stable at 200°C. At 590°C, Mo 2 CT x MXene was completely oxidized to MoO 3 .
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高影响因子
VACUUM
·
2020
·
IF 2.906
Kehua Han,Ximing Zhang,Peng Deng,Qingjie Jiao,Enyi Chu
In this study, we reported that two-dimensional titanium carbide (Ti 3 C 2 ) MXene has intrinsic catalytic activity for thermal decomposition of high-energy ammonium perchlorate-based molecule perovskite (H 2 dabco)[NH 4 (ClO 4 ) 3 ] (DAP-4). The micro morphology and structure of Ti 3 C 2 MXene were characterized. Thermal catalysis decomposition of DAP-4 using Ti 3 C 2 as a novel catalyst was investigated by Differential scanning calorimetry (DSC). The results showed that with 10 wt% Ti 3 C 2 added, the decomposition temperature of DAP-4 was reduced to 341.2 °C at the heating rate of 10 °C·min −1 , which decreased by 43.8 °C from raw DAP-4 (385 °C). The activation energy of DAP-4 thermal decomposition effectively reduced from 181 kJ mol −1 to 155 kJ mol −1 . A possible mechanism of Ti 3 C 2 MXene for the catalysis thermal decomposition of DAP-4 was proposed. This work provides a proof-of-principle concept for the thermal catalysis decomposition of ammonium perchlorate-based molecule perovskite energetic materials using the titanium carbide MXene as a catalyst.
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高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2021
·
IF 13.273
Wenxiang Yang,Guozhi Ma,Yin Fu,Ke Peng,Hongli Yang,Xiaoqiang Zhan,Weiyou Yang,Lin Wang,Huilin Hou
The development of novel and efficient heterojunction photocatalysts is still a challenging issue for achieving highly efficient solar-to-chemical energy conversion. Herein, we report the construction of Ti 3 C 2 MXene@TiO 2 /CuInS 2 (M@T/CIS) integrated Schottky/step-scheme (S-scheme) heterojunction by two-step hydrothermal process for boosting photocatalytic hydrogen generation activity. The as-prepared M@T/CIS hybrid photocatalysts exhibit the synergistic effects for enhanced visible-light harvesting, improved charge transfer and increased active site for photocatalytic H 2 evolution. They deliver a H 2 evolution rate of 356.27 μmol g -1 h −1 , which is ∼ 69 and 636 times higher than those of M@T and CIS, respectively, representing their potential applications towards photocatalytic H 2 evolution.
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高影响因子
Solar RRL
·
2021
·Vol. 5
·期 11
·2100593
·
IF 8.582
Chenyang Cai,Yongqin Wang,Zechang Wei,Yu Fu
2D MXene materials have shown great potential in photothermal conversion, especially for solar steam generation. However, the obvious light losses at the liquid−solid interfaces still limit its broad applications, thereby resulting in a poor light absorption ability. To this end, a facile and general approach is designed for the construction of nanoflower MXene@MoS 2 with excellent photothermal conversion ability via one-step hydrothermal process. Thanks to the multireflective and synergestic effects between MXene and MoS 2 , the hierarchical MXene@MoS 2 heterostructure exhibits broadband light absorption and improved photothermal conversion capacity (69 °C after 10 min solar illumination). Furthermore, inspired by the water vapor process in multiple channels of trees, an ultrathin MXene@MoS 2 -based nanofibrous membrane is assembled via directional electrospinning technology. Compared with traditional irregular channels, the controllable and tree-inspired 3D structure shows competitive advantages in solar absorption and water transport. Thus, the as-prepared self-floating membrane presents durable hydrophobicity (contact angle [CA] = 125°) and a high evaporation rate of 1.39 kg/(m 2 h) (91% efficiency) under 1 sun, which is higher than reported. This 3D MXene-based device also shows promising electrical generation, solar-driven sewage, and desalination treatments (99% desalination efficiency). Such high-performance self-floating photothermal membranes with multifunctionalities might provide an effective strategy for solving the global problems of freshwater shortage.
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高影响因子
Advanced Composites and Hybrid Materials
·
2021
·Vol. 4
·期 3
·602-613
·
IF 5.693
Guo Yan,Wang Dedong,Bai Tiantian,Liu Hu,Zheng Yanjun,Liu Chuntai,Shen Changyu
Two-dimensional Ti 3 C 2 T x MXene nanosheets with excellent electrical conductivity and layered structure have shown great promising in electromagnetic wave (EMW) absorption. Here, MXene nanosheets with homogeneously anchored NiFe 2 O 4 nanoparticles (NiFe 2 O 4 /MXene) were prepared using facial electrostatic self-assembling and freeze-drying technique. Interestingly, the minimum reflection loss ( RL min ) of paraffin wax-based composites with only 3% NiFe 2 O 4 /MXene reached as low as − 41.83 dB, showing much stronger EMW absorption property than that of MXene nanosheets ( RL min = − 5.03 dB) at the same loading level. This can be mainly ascribed to the existence of NiFe 2 O 4 nanoparticle that can effectively prevent the self-stacking of MXene nanosheets, causing improved conduction loss. Besides, large amounts of heterogeneous interfaces between NiFe 2 O 4 nanoparticle and MXene can also produce additional interface polarization loss. More importantly, magnetic loss arising from the magnetic NiFe 2 O 4 nanoparticle is beneficial for good impedance matching, enabling more EMW to enter into the interior of composites to be dissipated. Furthermore, effective absorption bandwidth in the frequency range of 3.44–18 GHz can be achieved by adjusting the matching thickness of composites with 5% NiFe 2 O 4 /MXene. This study paves a way for preparing high-performance MXene-based EMW absorber at ultralow loading level. Graphical abstract Electrostatic self-assembled NiFe2O4/MXene nanocomposites exhibit excellent electromagnetic wave absorption performance based on the synergistic effect of bifillers
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高影响因子
PROGRESS IN ORGANIC COATINGS
·
2021
·
IF 5.161
Sihao Li,Haowei Huang,Fan Chen,Xiaoling He,Yanqi Ma,Li Zhang,Xinxin Sheng,Ying Chen,Elena Shchukina,Dmitry Shchukin
In this study, MXene (Ti 3 C 2 T x ) nanosheets were modified by an amino acid (L-Cysteine) to fabricate functionalized MXene (fMX) hybrid material . Results derived from FTIR, XRD , EDS and XPS confirm that L-Cysteine has succeeded in covalently functionalizing MXene's surface. Later, fMX was introduced into the waterborne epoxy (WEP) coating as fillers, and its anti-corrosion performance was studied through electrochemical impedance spectroscopy and potentiodynamic polarization tests. After being immersed in 3.5 wt% NaCl solution for 30 days, fMX/WEP still maintains a higher impedance modulus at lowest frequency (1.21 × 10 9 Ω·cm 2 ) and a lower corrosion rate (7.95 × 10 −6 mpy) compared to blank WEP. It is resulted from the well dispersion of fMX nanosheets in WEP matrix as well as the enhanced barrier properties offered by fMX. Our research provides a promising strategy for green modified MXene to improve the corrosion resistance of the coating.
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高影响因子
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