CARBON
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2024
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IF 10.5
Xiaotong Sun,Ze Wu,Xiuli Tan,Youqiang Xing,Peng Huang,Bingjue Li,Lei Liu
Research on developing highly efficient microwave absorption (MA) absorbers is crucial for addressing electromagnetic (EM) pollution and advancing stealth technology. MXene, a new class of MA materials, have been widely studied . Nevertheless, MXene often faces challenges such as high self-stacking and excessive electrical conductivity, which lead to poor impedance matching. To overcome these problems, the unique manufacturing produces an overall homogeneous and locally aggregated MXene in the form of island chains, enhancing electrical conductivity and polarization loss while alleviating the self-stacking problem of MXene nanosheets. Further improvement is achieved by modifying the N–CNF@MXene aerogel with MoS 2 through atomic layer deposition (ALD). This modification resulted in a layered core-sheath structure featuring the N–CNF@MXene@MoS 2 aerogel (NCMMA) absorber. Importantly, this process preserved the intrinsic structure of the material while significantly enhancing its MA performance. NCMMA has a minimum reflection loss RL min of −78.32 dB (3.49 mm) with a fill factor of only 3.97 %. The effective absorption bandwidth (EAB) is 7.58 GHz (2.5 mm), covering the Ku band. The unique joint process design of hierarchical core-sheath in situ heterogeneous interfaces combined with the complex interpenetrating conductive network structure employed in this work is a strong candidate for MA materials for next-generation lightweight stealth coatings.
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Inorganic Chemistry Frontiers
·
2024
·
IF 6.1
Ao Xu,Yan Liu,Jiahui Wang,Yijing Wang,Fuyi Jiang,Yanli Zhou
Limited by the poor electronic conductivity and strong interaction between Mg2+ and MoS2, the 2H phase of MoS2 as the cathode materials exhibits a low capacity along with poor rate capability. How to adopt the structure engineering to largely boost the Mg2+ diffusion kinetics and enhance the reaction activity are the current tasks that need to be addressed. Herein, the cation doping strategy is adopted to elaborately design the defective Cu-doped metallic MoS2 nanosheets (Cu-MoS2) via a hydrothermal process. The Cu2+ doping widens the layer distance, induces the formation of metallic 1T phase of MoS2, and ameliorates the structural stability. Thus, the Mg2+ ions diffusion kinetics and the electronic conductivity of Cu-MoS2 are largely boosted. Meanwhile, the MgCl+ in the electrolyte can decrease the reaction energy barrier, and therefore fasten the electrochemical reaction. Therefore, the optimized Cu-MoS2 as the cathode materials toward magnesium ion batteries exerts remarkable magnesium storage properties, evidently superior to the pure MoS2. When cycled at 0.1 A g-1 over 100 cycles, the discharge capacity can reach as high as 369.5 mAh g-1. Even cycled at a high rate of 1 A g-1, the Cu-MoS2 maintains a specific capacity of 267.3 mAh g-1 over 200 long cycles. The related kinetics tests confirm its rapid reaction kinetics and pseudocapacitance dominated charge storage process. The ex-situ XPS and HRTEM data largely verify the conversion reaction mechanism of Cu-MoS2 during cycling. This work provides guidelines for the long-term development of MoS2 in the field of magnesium ion batteries.
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NEW JOURNAL OF CHEMISTRY
·
2024
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IF 2.7
Yuangong Ma,Wensheng Zhang,Zhifang Wu,Zhishan Liang,Youlin Huang,Qingmei Tan,Tianren Liu,Dongxue Han,Li Niu
In the realm of photocatalysis, effectively utilizing solar energy, especially the near-infrared (NIR) spectrum, presents substantial challenges. To tackle this issue, a novel composite of NaYF4:Yb3+/Er3+@Cu2O@MoS2@Fe3O4 (denoted as NYE@Cu2O@MoS2@Fe3O4) was ingeniously fabricated and assessed for the photodegradation of organic contaminants. By harnessing the distinct properties of upconversion materials, narrow bandgap semiconductors, and magnetic substances, the NYE@Cu2O@MoS2@Fe3O4 catalyst possesses a photodegradation rate of 92% for the rhodamine B dye under NIR light radiation, which is superior to NYE@Cu2O (50%) and NYE@Cu2O@MoS2 (85%). The enhanced performance in the near-infrared photocatalysis of NYE@Cu2O@MoS2@Fe3O4 is mainly attributed to the synergistic effect of various components, which promotes an increase in photo-induced carrier generation and facilitates their efficient transfer and energy utilization under NIR irradiation. This study provides a possible route for the near-infrared photocatalytic degradation of pollutants in areas with limited light or even dark conditions.
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MICROCHIMICA ACTA
·
2024
·Vol. 191
·期 8
·1-12
·
IF 5.3
Miao Fengjuan,Lu Yanan,Tao Bairui,Zhao Man,Chu Paul K.
Dual-functional nanomaterial electrodes have the capability to satisfy the requirements for both sweat analysis and the hydrogen evolution reaction (HER), thereby enabling the integration of electrochemical sensing and hydrogen production. In this study, ZIF-67 cubes are synthesized on nickel foam (NF), while TiO 2 is obtained through an annealing process. Subsequently, the ZIF-67@TiO 2 /MoS 2 nanocomposite is fabricated on nickel foam via a hydrothermal method. This composite material exhibits exceptional photocatalytic properties and is also suitable for the detection of glucose in sweat. The glucose detection range spans from 10 nM to 10 mM with a sensitivity of 7.24 μA mM −1 cm − 2 for a signal-to-noise ratio of 3 and a detection limit of 0.43 μM. Moreover, when utilized as a hydrogen evolution electrode, this material demonstrates a current density of 10 mA cm -2 at an overpotential of 118 mV, with a Tafel slope of 73 mV/dec. The synthesis process is both straightforward and economical. This research introduces a novel concept for the design of multifunctional chemical sensors. Graphical Abstract
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PubMed
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Journal of Water Process Engineering
·
2024
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IF 6.3
Bingkun Liu,Guanghui Wang,Jinyang Li,Beibei Liu,Ruoyu Li,Hongda Huang,Hengzhen Shi,Jingtao Zhang
MoS 2 quantum dots decorated g-C 3 N 4 /AgI Z -scheme heterostructures were successfully prepared and applied in tetracycline hydrochloride (TCH) degradation and Escherichia coli ( E. coli ) disinfection upon visible light exposure. The ternary heterojunction achieved highly efficient photocatalytic abilities, which could eliminate 82.8 % of TCH in 50 min and absolutely kill E. coli in 40 min, superior to those of bare g-C 3 N 4 , AgI, g-C 3 N 4 /MoS 2 and g-C 3 N 4 /AgI binary composites. Benefiting from the Z -scheme heterostructure, the separation and migration efficiency of charge carriers in the g-C 3 N 4 /MoS 2 /AgI composite was greatly improved, which led to more effective production of predominant O 2 − and OH during the photocatalytic process. This work delivered an example of highly efficient composite photocatalyst and discussed the role of MoS 2 QDs as charge transfer mediator in Z -scheme photocatalytic system.
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APPLIED SURFACE SCIENCE
·
2024
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IF 6.3
Yanni Li,Yujia Han,Hongxia Li,Xiaohui Niu,Deyi Zhang,Haiyan Fan,Kunjie Wang
A novel visible-light-driven type II p-n heterojunction CAU-17/MoS 2 photocatalytic antifouling biocide was prepared and indicated significant inhibition against the most pharmaceutically recognized harmful microorganisms: gram-positive Staphylococcus aureus ( S. aureus ), gram-negative Escherichia coli ( E. coli ) and the drug-resistant bacterium methicillin-resistant Staphylococcus aureus (MRSA). The antimicrobial mechanism is attributed to the production of reactive oxygen species (ROS) such as •OH, 1 O 2 due to the photocatalytic properties of CAU-17/MoS 2 heterojunction. The electron-hole complexation efficiency of the nanocomposites was analyzed using photoluminescence spectroscopy and characterized using electron microscope. It was found that the heterojunction structure of the nanocomposites provided multiple charge transfer channels to significantly improve the transporting and separating efficiency for the photo-induced electron-hole pairs, which consequently facilitated the production of ROS. Given the promising antimicrobial effects, further investigation on the broader application of CAU-17/MoS 2 biocides is needed to test the cytotoxicity, as well as the post-bacteriostatic wound healing effect upon animal models.
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ChemElectroChem
·
2018
·Vol. 5
·期 10
·1350-1356
·
IF 4.446
Zhenhua Liao,Qingwei Li,Jiabao Zhang,Juan Xu,Biao Gao,Paul K. Chu,Kaifu Huo
Graphical Stand up straight : Vertically oriented MoS 2 nanoflakes on N-doped carbon nanosheets (MoS 2 /NC) are produced, which serve as the large-capacity, high-rate, and long-life anodes for lithium-ion batteries. The MoS 2 /NC electrode shows excellent cycling stability with a reversible capacity of 722 mAh g −1 at 100 mA g −1 after 100 cycles as well as a rate performance of 554 mAh g −1 at 2000 mA g −1 . MoS 2 is a promising anode material for lithium-ion batteries (LIBs) because of its layered structure, analogous to that of graphite, and high lithium storage capacity of 670 mAh g −1 . However, its practical implementation in LIBs is hindered by poor conductivity, large volume change, and possible polysulfide shuttling during cycling. In this work, oriented MoS 2 nanoflakes grown on N-doped carbon nanosheets (MoS 2 /NC) are investigated as high-performance anodes in LIBs. The materials are prepared by annealing dodecylamine-intercalated MoO 3 nanosheets under Ar at 400 °C, followed by a hydrothermal treatment in the thiourea (CH 4 N 2 S) solution at 220 °C for 30 h. In the MoS 2 /NC structure, the NC nanosheets constitute a long-range conductive network for fast electron transfer, whereas the oriented MoS 2 nanoflakes provide sufficient active sites for Li + storage and fast Li + diffusion along the a – b plane. Consequently, the MoS 2 /NC electrode shows a remarkable capacity of 803 mAh g −1 at a current density of 100 mA g −1 , a high rate capability of 554 mAh g −1 at 2000 mA g −1 , and excellent cycle stability. Our results reveal a facile and general method to produce high-performance heterostructured MoS 2 /NC anodes and the process can be extended to other metal dichalcogenides for future high-performance LIBs.
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JOURNAL OF FOOD COMPOSITION AND ANALYSIS
·
2025
·
IF 4.6
Zijun Niu,Yingkun Shi,Sijia Liu,Yu Lv,Songlei Wang
In this study, a new electrochemical sensing platform for sulfamethazine (SDM) was prepared using MIP/CNT/MoS 2 -CoNi/GCE as an electrode modifier on a glassy carbon electrode (GCE). Firstly, theoretical simulations and quantum calculations based on density-functional theory (DFT) accelerate the prediction of the template molecule-to-functional monomer ratio. Nanocatalytic materials (CNT/MoS 2 -CoNi) loaded with metal ions Co and Ni were synthesised by a simple solvothermal method and then drop-coated onto GCE. The molecularly imprinted polymer (MIP) film with specific recognition sites can be generated on the modified electrode by electropolymerization. The successful formation of nanocatalytic materials was assessed by various characterisations such as scanning electron microscopy and X-ray diffraction. Under optimal conditions, the constructed sensor showed excellent detection efficiency for the oxidation of SDM in phosphate buffer solution (PBS, pH = 8.0) with a linear range of 0.1 μM to 800 μM and a detection limit of 0.033 μM. The sensor exhibits exceptional stability, reproducibility, and anti-interference capabilities, rendering it suitable for the detection of SDM residues in meat.
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SEPARATION AND PURIFICATION TECHNOLOGY
·
2024
·
IF 8.1
Zhaoyan Deng,Yuhan Chen,Qiang Tian,Tianyi Guo,Yanjuan Zhang,Zuqiang Huang,Huayu Hu,Tao Gan
Modulation of the electronic structure of heterogeneous catalysts by introducing heterojunctions is an effective means to improve their catalytic performance. Although Co-based nanocatalysts have been widely used in the reduction of 4-nitrophenol (4-NP) wastewater, Co single-atom catalysts (SACs) have rarely been reported. Herein, we successfully fabricate Co SACs supported on CNT/MoS 2 heterojunction nanocomposite (Co 1 -MoS 2 /CNT) by a hydrothermal synthesis combined with the subsequent impregnation method. The catalytic performance of Co 1 -MoS 2 /CNT is evaluated using the reduction of 4-NP in an aqueous media containing sodium borohydride. Complete reduction of 4-NP catalyzed by Co1-MoS 2 /CNT occurs within 5 min at room temperature, and the apparent rate constant k can reach 1.16 min −1 , which is 4.1 and 38.6 times higher than those of Co 1 -CNT and Co 1 -MoS 2 , respectively. The improved catalytic performance of Co 1 -MoS 2 /CNT is attributed to the p-n heterojunctions of MoS 2 /CNT increasing the electron density of the Co single-atom sites, as well as the CNTs with excellent conductivity, accelerating the electron transfer. Moreover, Co 1 -MoS 2 /CNT exhibits excellent stability and favorable applicability, endowing its potential for practical applications. Our findings not only provide useful insights into the enhancement of catalytic performance of SACs, but also open a new avenue for the treatment of 4-NP wastewater.
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RSC Advances
·
2017
·Vol. 7
·期 15
·9009-9014
·
IF 3.108
Xingzhong Guo,Zichen Wang,Wenjun Zhu,Hui Yang
Multilayer molybdenum disulfide (MoS2) was facilely prepared by a chelation-assisted sol–gel method with ammonium molybdate tetrahydrate ((NH4)6Mo7O24·4H2O) as the molybdenum source, thioacetamide (CH3CSNH2) as the sulfur source and diethylenetriamine pentaacetic acid (Dtpa) as the chelating agent, subsequently followed by high-temperature calcination. The chelating agent Dtpa ingeniously mediated the chelation reaction of the system and promoted the formation of a monolithic gel. The hexagonal MoS2 crystal (2H-MoS2) with good crystallinity precipitated after calcination at 1000 °C with the Mo and S mass ratio of 1 : 3. The adjustable MoS2 layers stacked together to form MoS2 flakes, and these flakes aggregated to construct crystalline MoS2 particles. The electrochemical tests showed the possibility of as-prepared MoS2 crystals applied as a negative electrode for lithium ion batteries.
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Materials Today Energy
·
2024
·
IF 9
K.S. Chandrakantha,Z. Zuo,B.N. Chandrashekar,A. Amini,K.S. Rangappa,S. Srikantaswamy,C. Cheng
A composite catalyst, zinc-doped laser-reduced graphene oxide (LrGO), is synthesized with highly dispersed molybdenum disulfide (MoS 2 ) nanolayers using laser exfoliation followed by a hydrothermal process. The resultant LrGO–ZnO/1T–2H MoS 2 (GZM3) catalyst exhibits enhanced hydrogen evolution reaction (HER) catalytic performance and improved stability. It achieves small overpotentials of 94 and 191.5 mV at a current density of 10 mA cm −2 , under acidic and alkaline conditions, respectively. This superior catalytic activity is attributed to the high electrical conductivity and large electrochemical surface area of graphene, along with efficient charge transfer facilitated by Zn ions between LrGO–ZnO and 1T–2H MoS 2 .
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Materials Today Communications
·
2024
·
IF 3.7
Q. Li,J. Shang
Al 2 O 3 /MoS 2 /CePO 4 composite ceramic layer was in-situ prepared on aluminum alloy by micro-arc oxidation. The results show that the content of (CH 3 CO 3 ) 3 Ce·xH 2 O has a great influence on the microstructure of the ceramic layer. When the addition amount is 7.5 g/L, the surface hardness of the ceramic layer is 961.97 HV 1 , which is 1.8 times that of the unadded and 8.36 times that of the matrix. Tribological tests show that the moderate addition of (CH 3 CO 3 ) 3 Ce·xH 2 O also significantly improves the wear resistance of the ceramic layer. Composite layer research can be developed and applied to other alloys to improve their friction properties.
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