Nanoscale Research Letters
·
2022
·Vol. 17
·期 1
·1-11
·
IF 5.418
Jiang Xingwang,Cheng Jie,Liu Ping,Gao Qingguo,Liu Liming
High-quality four-layer molybdenum disulfide (MoS 2 ) nanosheets with lateral dimension of about 11 µm were prepared by ultrasonic treatment of MoS 2 powder with assistance of 1-methyl-2-pyrrolidone (NMP) solvent. The optimal preparation conditions for the preparation of MoS 2 nanosheets were investigated from the aspects of ultrasonic processing time, ultrasonic power and amount ratio of MoS 2 powder and NMP solvent. At the same time, the MoS 2 nanosheets were employed as anode buffer layer in organic light-emitting diode (OLED) with copper nanowire (CuNW) film being anode. MoS 2 nanosheets can reduce roughness of CuNW film, protect CuNW film from oxidation and improve work function of CuNW film. Experiments show that MoS 2 nanosheets can significantly improve the current density and brightness of the OLED with CuNW film being anode. The maximum brightness of the OLED with MoS 2 anode buffer layer is 2.15 times that of the OLED without MoS 2 anode buffer layer. The current density of the OLED with MoS 2 anode buffer layer is also obviously increased compared with the OLED without MoS 2 anode buffer layer.
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ADVANCED MATERIALS
·
2022
·Vol. 35
·期 8
·2207447
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IF 32.086
Weiwei Li,Manzhang Xu,Jiuwei Gao,Xiaoshan Zhang,He Huang,Ruoqing Zhao,Xigang Zhu,Yabao Yang,Lei Luo,Mengdi Chen,Hongjia Ji,Lu Zheng,Xuewen Wang,Wei Huang
Synthesis of large-area patterned MoS 2 is considered the principle base for realizing high-performance MoS 2 -based flexible electronic devices. Patterning and transferring MoS 2 films to target flexible substrates, however, require conventional multi-step photolithography patterning and transferring process, despite tremendous progress in the facilitation of practical applications. Herein, an approach to directly synthesize large-scale MoS 2 patterns that combines inkjet printing and thermal annealing is reported. An optimal precursor ink is prepared that can deposit arbitrary patterns on polyimide films. By introducing a gas atmosphere of argon/hydrogen (Ar/H 2 ), thermal treatment at 350 °C enables an in situ decomposition and crystallization in the patterned precursors and, consequently, results in the formation of MoS 2 . Without complicated processes, patterned MoS 2 is obtained directly on polymer substrate, exhibiting superior mechanical flexibility and durability (≈2% variation in resistance over 10,000 bending cycles), as well as excellent chemical stability, which is attributed to the generated continuous and thin microstructures, as well as their strong adhesion with the substrate. As a step further, this approach is employed to manufacture various flexible sensing devices that are insensitive to body motions and moisture, including temperature sensors and biopotential sensing systems for real-time, continuously monitoring skin temperature, electrocardiography, and electromyography signals.
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JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2022
·
IF 9.965
Feifei Lin,Renren Tian,Pei Dong,Guofei Jiang,Fengting He,Shuaijun Wang,Rongbing Fu,Chaocheng Zhao,Ying-Ying Gu,Shaobin Wang
Photoelectrochemical (PEC) reaction with efficient, stable, and cost-effective photocathodes using non-precious metals will be one of the most environmentally friendly technologies for hydrogen (H 2 ) generation under the worldwide pressure for carbon neutrality. Herein, a new 3-dimentional (3D) SiNWs@MoS 2 /NiS 2 photocathode was designed and synthesized. Defect-rich MoS 2 /NiS 2 nanosheets on silicon nanowires (SiNWs) provide more active sites to promote charge transfer and photo-generated electron-hole separation. Meanwhile, the 3D structure of the photocathode provides an effective charge transfer mode and an open channel for rapid H 2 release. The SiNWs@MoS 2 /NiS 2 photocathode exhibits the maximum photocurrent density (21.4 mA·cm −2 at 0.9 V vs. RHE), highest H 2 production rate (183 μmol·h −1 ), smallest diffusion resistance (34.7 Ω), and excellent catalytic stability for more than 10 h at pH = 7. Based on density function theory calculation, the MoS 2 /NiS 2 nanosheets are conducive to chemical adsorption of H 2 intermediates, which are crucial for the maintenance of the composite photocathode in PEC H 2 production.
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RSC Advances
·
2022
·Vol. 12
·期 44
·28349-28358
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IF 4.036
Xin Zhang,Siqin Wang,Jiahao Dao,Jiajing Guo,Yanfang Gao
A novel colorimetric platform based on nano-composites of two-dimensional (2D) molybdenum disulfide nanosheets (MoS2 NSs) and one-dimensional (1D) carbon nanotubes (CNTs), called 2D–1D MoS2-CNT nanozyme, was fabricated for the selective and sensitive determination of hydrogen peroxide (H2O2) in soda water. The MoS2-CNT nanozyme was synthesized through a one-step solvothermal reduction method. The introduced CNTs could effectively prevent the stacking of MoS2 nanosheets (NSs) and not only expanded the interlayer distance of MoS2 NSs from 0.620 nm to 0.710 nm but also improved their specific surface. Under acidic conditions, the as-prepared 2D–1D MoS2-CNT nanozymes could oxidize the colorless 3,3′,5,5′-tetramethylbenzidine (TMB) to blue-oxidized TMB (oxTMB) in the presence of H2O2, resulting in enhanced peroxidase-like (POD-like) activity. The kinetic study showed that MoS2-CNT nanozyme had stronger catalytic activity than natural horseradish peroxidase (HRP). The linear range for H2O2 colorimetric determination was 5.00–500 μmol L−1 with a limit of detection (LOD) of 1.40 μmol L−1. Furthermore, the established determination method was applied to actual samples and the recoveries of H2O2 spiked in soda water were in the range of 92.3–107%, showing feasibility for the analysis of food.
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NEW JOURNAL OF CHEMISTRY
·
2022
·Vol. 46
·期 41
·19790-19801
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IF 3.925
Chaofei Guo,Yaomeng Yao,YingNan Cao,Qin Feng,Yifan Zhang,Yong Wang
Molybdenum disulfide (MoS2), with its unique two-dimensional nanostructure and high theoretical capacity, is considered a promising electrode for lithium-ion batteries (LIBs). However, the disadvantages of MoS2 electrodes include low electronic conductivity, sluggish cation kinetics, serious volume change, poor cycle stability, and inefficient rate performance of lithium storage. Herein, oxygen vacancy and heterostructure engineering are rationally involved in revealing the moderate oxygen vacancy in the hierarchical tubular heterostructure material (MoS2@MoO2) via a self-template method as a highly active LIB electrode. Due to the presence of the moderate oxygen vacancies and heterojunction structure of MoS2@MoO2-4, the diffusion pathway and barrier for lithium ions can be significantly reduced, accelerating the ionic diffusion rate and further promoting the reaction kinetics. The electrode achieves a high reversible capacity of 1200.1 mA h g−1 at 100 mA g−1 after 100 cycles with the optimum regulation of the sulfur contents and the moderate oxygen vacancy (MoS2@MoO2-4). Additionally, good rate capability is obtained at stepwise current densities due to the merits of MoS2@MoO2. A series of measurements such as EPR, XPS, in situ XRD, and in situ Raman are also employed to reveal the synergistic effect in the midst of oxygen vacancies and heterostructures for lithium storage. All results prove that the moderate oxygen vacancy and tubular heterostructure can implement faster Li+ transport and lower the diffusion barrier of lithium ions, resulting in enhanced lithium storage performance of MoS2@MoO2.
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JOURNAL OF ALLOYS AND COMPOUNDS
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2022
·
IF 6.371
Bingbing Fan,Muhammad Tamoor Ansar,Qianqian Chen,Fengchun Wei,Heng Du,Bo Ouyang,Erjun Kan,Yongqiang Chen,Biao Zhao,Rui Zhang
Simple and effective synthesis methods for 2D/2D heterostructure and the synergistic effect of 2D/2D composites on microwave absorbing (MWA) performance remain to be further explored and investigated. Herein, 2D/2D MoS 2 /Ti 3 C 2 T x heterostructure was successfully synthesized in 30 min by a cost-effective and time-saving microwave-assisted hydrothermal method . The 2 H-MoS 2 nanosheets with a thickness of 5–10 nm were homogeneously anchored on the surface of Ti 3 C 2 T x layers, showing a tunable distribution density. Besides, the metallic properties of MoS 2 /Ti 3 C 2 T x and the strong interaction between MoS 2 and Ti 3 C 2 T x , were revealed by DFT calculations, which was employed to further understand the MWA mechanism in terms of molecular dynamics. The MoS 2 /Ti 3 C 2 T x composites with an optimum mass ratio of MoS 2 to Ti 3 C 2 T x (6:1) displayed the best MWA performance. The minimum reflection loss ( RL ) value of −41.5 dB was attained with a layer thickness of only 2.0 mm at 12.2 GHz and a 3.6 GHz maximum efficacious absorption bandwidth. The MWA mechanism of MoS 2 /Ti 3 C 2 T x composites was comprehended from multiple reflections and scattering effects, synergetic effects of conductive losses and attenuation capacity, and polarization relaxations. This work provides a facile method for the synthesis of 2D/2D heterostructure, and also provides a candidate material as potential microwave absorber.
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JOURNAL OF POWER SOURCES
·
2022
·
IF 9.794
Qisheng Zang,Qingfeng Zhang,Zuocheng Luo,Luocheng Liao,Xiaoping Ouyang,Shuhong Xie
The anode materials with high capacity, excellent reversibility and good cycling stability are important for potassium-ion batteries (PIBs) application. Herein, we construct a freestanding anode structure by bounding the carbon-coated MoS 2 on porous carbon nanofibers (C@MoS 2 @PCNF) for PIBs. Benefiting from the frame supporting of carbon nanofiber and carbon coating, the C@MoS 2 @PCNF materials have high conductivity and firm electrode structure . The porous structure of the carbon nanofibers alleviate the volume expansion of the MoS 2 nanosheets during the reaction process effectively. Meanwhile, the MoS 2 nanosheets have abundant dislocation defects and larger interlayer spacing. The C@MoS 2 @PCNF materials present excellent potassium storage performance used as PIBs anode. It delivers a high reversible capacity and a superior rate capacity, corresponding value are 323 mA h g −1 after 100 cycles at 100 mA h g −1 current density and 198 mA h g −1 at 1000 mA g −1 current density. The ex-situ atomic force microscope (AFM) images reveal the process of gradually forming SEI on the surface of C@MoS 2 @PCNF during the first cycle. Moreover, the C@MoS 2 @PCNF is assembled for potassium ion capacitor (PIC) with activated carbon (AC) to evaluate the potential application, which presents an excellent cycle stability.
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JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2022
·
IF 9.965
Yufei Ren,Chuantao Wang,Wen Duan,Lihai Zhou,Xiangxiang Pang,Danjun Wang,Yanzhong Zhen,Chunming Yang,Ziwei Gao
Electrocatalytic urea oxidation reaction (UOR) is a prospective method to substitute the slow oxygen evolution reaction (OER) and solve the problem of urea-rich water pollution due to the low thermodynamic voltage, but its complex six-electron oxidation process greatly impedes the overall efficiency of electrolysis. Here, density functional theory (DFT) calculations imply that the metallic Ni 3 S 2 and semiconductive MoS 2 could form Mott-Schottky catalyst because of the suitable band structure . Therefore, we synthesized MoS 2 /Ni 3 S 2 electrocatalyst by a simple hydrothermal method , and studied its UOR and hydrogen evolution reaction (HER) performance. The formed MoS 2 /Ni 3 S 2 Schottky heterojunction is only required 109 and 166 mV to obtain ±10 mA cm −2 for UOR and HER, respectively, showing great bifunctional catalytic activity. Moreover, the full urea electrolysis driven by MoS 2 /Ni 3 S 2 delivers 10 and 100 mA cm −2 at a relatively low potential of 1.44 and 1.59 V. Comprehensive experiments and DFT calculations demonstrate that the MoS 2 /Ni 3 S 2 Schottky heterojunction causes self-driven charge transfer at the interface and forms built-in electric field, which is not only benefit to reduce H* adsorption energy , but also helps to adjust the absorption and directional distribution of urea molecules, thereby promoting the activity of decomposition of water and urea. This research furnishes a tactic to devise more efficient catalysts for H 2 generation and the treatment of urea-rich water pollution.
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SENSORS AND ACTUATORS A-PHYSICAL
·
2022
·
IF 4.291
Shufang Ren,Wangyong Cui,Ying Liu,Shounian Cheng,Qingtao Wang,Runyan Feng,Zhixiang Zheng
1T phase molybdenum disulfide (MoS 2 ) possesses excellent electrical conductivity , 10 7 times higher than that of 2H phase MoS 2 . Thus, metallic 1T MoS 2 is highly desirable for electrochemical analysis and catalysis. In this study, hybrid 1T/2H MoS 2 /multi-walled carbon nanotubes (MoS 2 /MWCNTs) composite was prepared by a facile and simple hydrothermal approach. Powder X-ray diffraction, field emission scanning and transmission electron microscopes, Fourier transform infrared spectroscopy, Raman spectroscopy , cyclic voltammetry (CV), and electrochemical impedance spectroscopy were used to characterize the composites. The results show that metallic 1T phase MoS 2 was formed by the inductive effect of MWCNTs. The high conductivity and large specific surface area of hybrid 1T/2H MoS 2 /MWCNTs composite endow great catalysis activity in electrochemical analysis. Polypyrrole molecularly imprinted polymer (MIP) film imprinted with acetaminophen (AP) template was electrochemically deposited on glassy carbon electrode (GCE) modified by 1T/2H MoS 2 /MWCNTs (MoS 2 /CNTs/GCE) to construct MIP based sensor. The prepared MIP/MoS 2 /CNTs/GCE sensor shows a sensitive current response towards AP. Through the optimization of the ratio of monomer and template, CV electropolymerization cycles, CV elution cycles, incubation time, and pH, the accessible linear range of 0.01–300 μM was obtained with the limit of detection of 0.003 μM (S/N = 3) by differential pulse voltammetry . In addition, the prepared sensor shows great detecting robustness with excellent selectivity , anti-interference property, reproducibility, and stability. In the urine sample tests, the sensor shows desirable reliability with the recovery rate of 88.1–95.9%.
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MICROCHEMICAL JOURNAL
·
2022
·
IF 5.304
Wenhao Peng,Ningning Song,Zilong Su,Jiajun Wang,Kaixuan Chen,Shuji Li,Bingyan Wei,Shiping Luo,Aijuan Xie
A series of MoS 2 and Mn metal organic frameworks (Mn-MOF) were synthesized by hydrothermal method, and then MoS 2 , Mn-MOF and multi-walled carbon nanotubes (MWCNT) were mixed in different mass ratios and applied for supercapacitor. Cyclic voltammetry (CV), electrochemical impedance spectroscopy (EIS), and galvanostatic charge–discharge (GCD) are used to investigate the electrochemical performance of MoS 2 /Mn-MOF/MWCNT materials with different mass ratios. The experimental results show that when the mass ratio of m(MoS 2 ): m(Mn-MOF): m(MWCNT) is 1:4:1, the electrochemical performance of the MoS 2 /Mn-MOF/MWCNT composite is the best. The specific capacitance of optimal MoS 2 /Mn-MOF/MWCNT (1:4:1) reaches 862.73F g −1 , which is noticeable higher than that of MoS 2 (42.29F g −1 ), Mn-MOF (70.23F g −1 ) and MWCNT (347.27F g −1 ) materials. Moreover, the EIS test manifests that the MoS 2 /Mn-MOF/MWCNT (1:4:1) composite has a lower R ct value (2.566 Ω). Therefore, MoS 2 /Mn-MOF/MWCNT (1:4:1) has the best electrochemical performance among the all as-fabricated supercapacitor materials. This research provides an effective method for the development of Mn-based supercapacitor materials and improves the capacitance performance of MOFs materials.
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Journal of Materials Chemistry A
·
2022
·Vol. 10
·期 13
·7263-7270
·
IF 14.511
Xin Kang,Dongxu Wang,Jiancong Liu,Chungui Tian,He Xu,Jialu Xu,Honggang Fu
Improving the intrinsic catalytic activity of the active phases and mass transfer of the reactants and products are key issues in heterogeneous catalysis. Herein, we construct hollow zeolites with a thin shell of about 10 nm and mesopore structure as supports to load NiMoSX catalysts. On one hand, the nanocages with hollow structures can effectively confine the growth of NiMoSX catalysts, leading to a shorter slab length, higher sulfidation degree, more Ni–Mo–S active sites, and enhanced intrinsic activity. The deep hydrodesulfurization (HDS) activity for dibenzothiophene (DBT) of the NiMoSX/Hol-ZSM-5 catalyst is superior to that of NiMoSX on nanosized ZSM-5 with a reaction rate constant kHDS value of 18.74 × 10−7 mol g−1 s−1. On the other hand, the accessible nanocages and mesopore structure greatly facilitate the mass transfer process and inhibit the formation of carbon deposits, which enhances the HDS stability of NiMoSX/Hol-ZSM-5 to over 80 h. This hollow structure-confined strategy sheds light on the design of novel highly efficient supported catalysts, which we believe could be extended to other heterogeneous catalysis systems.
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NEW JOURNAL OF CHEMISTRY
·
2023
·Vol. 47
·期 35
·16531-16538
·
IF 3.3
Yulong Zheng,Hui Zhang,Pei Han,Zhaoshun Zhang,Xueqin Zuo,Qun Yang,Huaibao Tang,Shaowei Jin,Guang Li
Solar distillation can directly produce clean water from non-potable water resources using solar energy and has great promise in desalination systems. However, the improvement of evaporation efficiency through the selection and optimization of suitable candidate materials is still a challenging problem. In this paper, by implementing a customized insulating floating layer and establishing an interfacial evaporation system, we have achieved a successful experiment demonstrating the potential to improve the efficacy of solar steam generation. This system is created by growing 1T-2H mixed-phase molybdenum disulfide composites on the carbonized ZIF8 surface. In this study, the treated composites were well integrated with the thermal insulating floating layer to achieve a stable interfacial structure for photothermal conversion. Furthermore, the cotton threads, known for their great absorbency, created an unhindered pathway for water flow, making it easier for steam to be generated and circulated. Using the above system, under one solar illumination condition, a significant evaporation rate of 1.57 kg m−2 h−1 was attained. The solar steam conversion efficiency of this interfacial heating system under one solar illumination condition was 94.4%. In addition to demonstrating that interface engineering is effective for solar steam production, this work offers a simple and economical water purification method.
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危险品化学品经营许可证（带存储）