JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
·
2022
·Vol. 33
·期 7
·4093-4103
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IF 2.779
Ru Xuanhe,Li Haiyang,Peng Yiwen,Fan Zewen,Feng Junjie,Gong Lei,Liu Zhenguo,Chen Yanhui,Zhang Qiuyu
Lightweight and conductive MXene/reduced graphene oxide (MX/rGO) aerogels have great potential in the field of electromagnetic interference (EMI) shielding. To achieve better EMI shielding performance, some fabrication ways and reduction methods for MX/rGO aerogels have been tried, but still far from the expectation. Herein, we develop a feasible technique to fabricate MX/rGO aerogels, i.e., unidirectional-freezing and subsequent mild chemical reduction treatment using the mixture of hydroiodic acid and acetic acid glacial. The lightweight MX/rGO hybrid aerogel with the weight ratio of MX/rGO 5:5 demonstrates superior electrical conductivity (467 S/m) and EMI shielding performance (57.67 dB). When the weight ratio of MX/rGO becomes 3:5, the EMI shielding performance reaches as high as 21,427 dB cm 2 g −1 , which is almost higher than the EMI shielding performance of the 3D aerogels reported by the current available literature. The MX/rGO aerogels developed in this paper shows the great application potential in protecting the wearable and intelligent devices.
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APPLIED CATALYSIS B-ENVIRONMENTAL
·
2022
·
IF 24.319
Daoyuan Zu,Haoran Song,Changping Li,Yuwei Wang,Rong Du,Rui Zhou,Wei Zhang,Shiting Pan,Yang Cai,Yongming Shen,Zhifeng Yang
Self-catalyzed decomplexation of Cu-ethylene diamine tetraacetic acid complex (Cu-EDTA) and recovery of Cu without addition of extraneous transition metals were achieved in Ti 3 C 2 T x MXene/peroxymonosulfate (Ti 3 C 2 T x /PMS) process. Free radical quenching experiments and electron spin resonance (ESR) measurements demonstrated that both hydroxyl radical (HO • ) and sulfate radical (SO 4 •- ) contributed to the degradation of Cu-EDTA. Activation of PMS by Ti 3 C 2 T x initiated Cu-EDTA decomplexation and released free Cu ions . Then, the formation of Ti-O-Cu bonds between Cu ions and Ti 3 C 2 T x accelerated the electron transfer from Ti 3 C 2 T x to Cu(Ⅱ) and triggered Cu(Ⅱ)/Cu(Ⅰ) cycle, which further enhanced PMS activation and led to the self-catalyzed decomplexation of Cu-EDTA. Simultaneous recovery of Cu was achieved due to the excellent absorption performance of negative charged Ti 3 C 2 T x towards Cu ions. This study revealed the self-catalyzed decomplexation mechanism of Cu-EDTA in the Ti 3 C 2 T x /PMS process and provided a feasible strategy for heavy metal complexes treatment.
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CERAMICS INTERNATIONAL
·
2022
·
IF 5.532
Hongfei Yin,Chunyu Yuan,Huijun Lv,Kaiyue Zhang,Xue Chen,Yongzheng Zhang
Environmental crisis aroused from the Cr(VI)-containing wastewater has received much attention, due to the cancer-causing and mutagenic feature of Cr(VI). Photocatalytic technology has been considered to be a favorable contestant for coping with Cr(VI)-containing effluent. In this study, Ti 3 C 2 MXene/Zn 3 In 2 S 6 Schottky junctions with different content of Ti 3 C 2 MXene were prepared for Cr(VI) photoreduction. The inherent physical and photoelectrochemical characters of the obtained Ti 3 C 2 MXene/Zn 3 In 2 S 6 Schottky junctions were fully characterized. Compared with the pure Zn 3 In 2 S 6 , all the nanocomposites showed enhanced photocatalytic performance, the apparent kinetic constant of the optimized sample was 3.17 times the height of the Zn 3 In 2 S 6 . The improved photoreduction performance largely originated from the effectual separation and transfer of the photoexcited charge carriers. In the meantime, the deleterious role of superoxide radicals for Cr(VI) photoreduction was confirmed. It is anticipated this research can deliver a new-fangled vision for constructing efficient photocatalyst for Cr(VI) photoreduction.
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RSC Advances
·
2023
·Vol. 13
·期 23
·15872-15880
·
IF 3.9
Lulu Qian,Chengyu Yuan,Xu Wang,Haiguang Zhang,Lei Du,Gaoliang Wei,Shuo Chen
Membrane fouling is a major challenge for the membrane separation technique in water treatment. Herein, an MXene ultrafiltration membrane with good electroconductivity and hydrophilicity was prepared and showed excellent fouling resistance under electrochemical assistance. The fluxes under negative potential were 3.4, 2.6 and 2.4 times higher than those without external voltage during treatment of raw water containing bacteria, natural organic matter (NOM), and coexisting bacteria and NOM, respectively. During the treatment of actual surface water with 2.0 V external voltage, the membrane flux was 1.6 times higher than that without external voltage and the TOC removal was improved from 60.7% to 71.2%. The improvement is mainly attributed to the enhanced electrostatic repulsion. The MXene membrane presents good regeneration ability after backwashing under electrochemical assistance with the TOC removal remaining stable at around 70.7%. This work demonstrates that the MXene ultrafiltration membrane under electrochemical assistance possesses excellent antifouling ability and has great potential in advanced water treatment.
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PubMed
高影响因子
ADVANCED MATERIALS
·
2023
·Vol. 35
·期 35
·2302847
·
IF 29.4
Ju Bai,Wen Gu,Yuanyuan Bai,Yue Li,Lin Yang,Lei Fu,Shengzhao Li,Tie Li,Ting Zhang
Multifunctional selectivity and mechanical properties are always a focus of attention in the field of flexible sensors. In particular, the construction of biomimetic architecture for sensing materials can endow the fabricated sensors with intrinsic response features and extra-derived functions. Here, inspired by the asymmetric structural features of human skin, a novel tannic acid (TA)-modified MXene-polyurethane film with a bionic Janus architecture is proposed, which is prepared by gravity-driven self-assembly for the gradient dispersion of 2D TA@MXene nanosheets into a PU network. This obtained film reveals strong mechanical properties of a superior elongation at a break of 2056.67% and an ultimate tensile strength of 50.78 MPa with self-healing performance. Moreover, the Janus architecture can lead to a selective multifunctional response of flexible sensors to directional bending, pressure, and stretching. Combined with a machine learning module, the sensor is endowed with high recognition rates for force detection (96.1%). Meanwhile, direction identification in rescue operations and human movement monitoring can be realized by this sensor. This work offers essential research value and practical significance for the material structures, mechanical properties, and application platforms of flexible sensors.
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PubMed
高影响因子
DESALINATION
·
2023
·
IF 9.9
Yuanjin Wang,Yanjun Li,Qin Huang,Weijing Qi,Ruhao Zan,Min Gan,Zhenggang Rao,Linfeng Fei
MXene , an emerging two-dimensional material, has shown its evident application prospects in solar-driven interfacial water evaporation due to excellent photothermal conversion capability. However, MXene still suffers from a few undesirable characteristics in this scenario, including weak stability, self-stacking, and suboptimal optical absorption . To address these issues, in this paper, we fabricated a MXene-based composite aerogel , featuring with interconnected porous structure , broad and high solar absorption, good wettability and photothermal capacity. As our judicious structural and compositional design for the aerogel decreased the evaporation enthalpy of water, the solar steam generator based on the aerogel exhibited an outstanding water evaporation rate as high as 2.31 kg m −2 h −1 under one sun irradiation (and the corresponding solar-to-vapor conversion efficiency reached 90.8 %). Additionally, the aerogel was also designed with an excellent adsorption capacity for removal of heavy metal ions from water as well as a good antibacterial ability, which should be helpful in dealing with the complex working environments for solar steam generators. This work may shed light on the design and development of multifunctional solar steam generators toward practical and sustainable applications.
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CHEMICAL ENGINEERING JOURNAL
·
2023
·
IF 15.1
Xionghui Ma,Jinsheng Kang,Yuwei Wu,Chaohai Pang,Shuhuai Li,Jianping Li,Yuhao Xiong,Jinhui Luo,Mingyue Wang,Zhi Xu
The analytical functionalization of metal organic frameworks (MOFs) has been an extremely attractive topic in photoelectrochemical (PEC) sensing. However, most PEC sensors based on photoactive MOFs are more focused on the acquisition and amplification of semiconductor photoelectric signals, and the study of affinity mechanisms for specific targets is more limited. Here, we find that PCN-224 (Zn) can effectively sense organophosphorus structures through a multicenter affinity mechanism, as evidenced by x-ray photoelectron spectroscopy (XPS) and computational chemistry. Further, we coupled PCN-224(Zn) to Nb 4 C 3 to form a Schottky junction that enhances the photoelectric signal response of the sensor. In particular, the heterojunction exhibited a higher photocurrent density than pristine PCN-224(Zn) (17.3 μA vs. 26.5 μA cm −2 ). On the basis, we developed a novel MOF-based polycentric-affinity PEC sensing strategy for dimethoate (DIM) detection in concert with molecular imprinting technology. The affinity effects of the Lewis acidic center sites (Zn(II), Zr(IV)) and spatial matching through molecular imprinting synergistically ensure that DIM is precisely captured. Ultimately, a trace DIM-PEC sensor was constructed by a competitive strategy using dopamine as an electron donor. The photocurrent intensity was linearly related to the logarithm of DIM concentration in the range of 0.1 nM to 1000 nM, with a low detection limit of 26.1 pM (3σ/S). This study demonstrates the potential of bifunctional polycentric-affinity MOF in the PEC sensing.
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JOURNAL OF ALLOYS AND COMPOUNDS
·
2023
·
IF 6.2
Yuanhao Liu,Yingying Mei,Wen Xu,Minghui Zhang,Junwei Hou,Yanfeng Dong
Aqueous zinc ion batteries (ZIBs) are regarded as a promising battery mainly due to their high safety and environmental friendliness, but suffer from low capacity and energy density . Herein, a pre-intercalated manganese oxide (Na 0.55 Mn 2 O 4 ·1.5 H 2 O)/MXene hybrid (NMO/MXene) is successfully proposed for high-performance ZIBs , in which synergistic effect between MXene and NMO greatly improves the structural stability of NMO and facilitates fast charge transfer and ion diffusion kinetics. Therefore, the resulting NMO/MXene cathodes deliver high-rate capacity of 180 mAh g −1 at 10 C (3.08 A g −1 ) and long cycling life over 2500 times at 5 C, outperforming most reported Mn-base cathodes. The MXene-mediated strategy for advanced Mn-based cathodes developed here paves a new way to construct high-performance Zn-MnO 2 batteries.
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TRANSACTIONS OF NONFERROUS METALS SOCIETY OF CHINA
·
2023
·
IF 4.5
Hao-yu ZHANG,Gui-bin TIAN,Fu-ying WU,Zhen-dong YAO,Jia-guang ZHENG,Liu-ting ZHANG
Two-dimensional Mo 2 TiC 2 MXenematerial was synthesized by etching Mo 2 TiAlC 2 and then doped into MgH 2 to tailor its hydrogen storage performance. The initial hydrogen desorption temperature of the Mo 2 TiC 2 -doped MgH 2 was significantly reduced from 330 °C (pristine MgH 2 ) to 187 °C. Isothermal dehydrogenation analysis indicated that the MgH 2 +9 wt.% Mo 2 TiC 2 composite rapidly discharged 6.4 wt.% H 2 at 300 °C within 4 min. For hydrogenation, the dehydrogenated MgH 2 +9 wt.% Mo 2 TiC 2 uptook 6.5 wt.% H 2 at 175 °Cwithin 5 min. By calculation, the activation energy for MgH 2 +9 wt.% Mo 2 TiC 2 was calculated to be (135.6±1.9) kJ/mol for the desorption reaction and (46.1±0.2) kJ/mol for the absorption reaction. After 20 cycles, 1.0 wt.% H 2 was lost for the MgH 2 +9 wt.% Mo 2 TiC 2 composite. Microstructure analysis results showed that the presence of Mo in Mo 2 TiC 2 enhanced the thermal stability of MXene and reduced the amount of active Ti during cycling, leading to poorer catalytic effect of the catalyst compared to Ti 3 C 2 .
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POLYMER COMPOSITES
·
2023
·Vol. 45
·期 4
·3460-3473
·
IF 5.2
Shuo Meng,Tong Zhao,Xiaosong Wang,Xiaolong Wang,Yuantao Zhang
Polyvinylidene fluoride (PVDF) has broad application prospects in the field of dielectric capacitors. However, the low dielectric constant of the polymer greatly limits the improvement of its energy storage density. In this paper, a highly conductive two-dimensional transition metal carbide (MXene) is utilized to modify PVDF by doping to prepare PVDF/MXene composite dielectrics, and a PVDF/MXene model is established based on molecular dynamics simulations to investigate the microscopic mechanism of improvement in the dielectric properties of the PVDF matrix upon doping. Finally, the effect of the MXene on the thermal conductivity and the mechanical and insulating properties of PVDF was investigated. The experimental results show that the relative dielectric constant of the PVDF/MXene-1.0 wt% system at 100 Hz reached 14.54, which is 55.96% higher than that of pure PVDF, and this doping amount or lower can reduce the dielectric loss of PVDF. In addition, MXene doping improved the mechanical and thermal properties of the composite material to a certain degree. When the doping amount of MXene was lower than 1.0 wt%, the electric breakdown strength of the composite system was maintained above 245 MV/m, which is sufficient to achieve good insulation strength under most conditions. Highlights The low dielectric constant of polymers limits the improvement of their energy storage density. The doping of polymers with small amounts of conductive fillers can effectively increase the dielectric constant of the polymer matrix. A two-dimensional nanomaterial MXene is used to improve the dielectric properties of PVDF matrix and the micromechanisms are analyzed by molecular dynamics simulations. The key properties of PVDF/MXene, such as the mechanical properties, thermal conductivity and insulation, are characterized.
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APPLIED CATALYSIS A-GENERAL
·
2023
·
IF 5.5
Sisheng Guo,Yuqi Zheng,Xinyue Zhang,Xinying Lei,Hongfei Sun,Tao Wen
MXenes materials are burgeoning candidates for advanced water purification . However, the self-restacking and surface passivation of MXenes severely hamper the utilization of their electronic properties and surface reactivity. Herein, we employed the strategy of carbon nanoplating stabilization of MXenes for not only effectively stabilizing the structure of MXenes but also providing nucleation growth of MnO 2 . The MXene@C@MnO 2 -activated PMS system was able to degrade ∼ 100% of bisphenol A (BPA) (20 mg/L) within 4 min with the turnover frequency (TOF) of 8.14 min −1 . Specifically, the generation of superoxide radicals by activation of peroxymonosulfate (PMS) through reversible redox cycling between Mn(IV) and Mn(III) cations was regarded as the crucial driver of BPA removal. The scale-up experiment in actual water bodies achieved more than 90% BPA removal at 1200-bed volumes with stable catalytic properties during 20 h continuous operation. This work offers a potential macroscopic MXene-based nanohybrids for advanced oxidation processes .
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DIAMOND AND RELATED MATERIALS
·
2023
·
IF 4.1
Xuteng Xing,Yating Sui,Xiaoyang Xu,Dan Zhou,Qiushi Li,Yuelong Xu,Erjun Tang,Shaojie Liu
The Ti 3 C 2 T x MXene is a new class of two-dimensional inorganic material, which can be used as anticorrosive filler for epoxy coating . In this work, the BTA molecules are intercalated into Ti 3 C 2 T x MXene through hydrogen bonding to obtain a high-performance active-passive dual protective function Ti 3 C 2 T x MXene@BTA composite corrosion inhibitor . The morphology, structure and composition of prepared Ti 3 C 2 T x MXene@BTA nanocomposite were studied by scanning electron microscopy (SEM), X-ray diffraction (XRD) and X-ray photoelectron spectrometer (XPS). Moreover, the release behavior and inhibition behavior were investigated by UV–vis spectrophotometer and electrochemical impedance spectroscopy (EIS), respectively. The results show that the continuously released of BTA can be achieved by introducing BTA into Ti 3 C 2 T x MXene interlayer , and the complete release time can reach 1000 min. In addition, EIS results show that the Ti 3 C 2 T x MXene@BTA composite coating exhibited the excellent anti-corrosion properties, and the impedance value remains above 10 10 Ω·cm 2 for 50 days in 3.5 NaCl solution, which is 4 orders of magnitude higher than that of pure epoxy coating.
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