INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
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2023
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IF 4.2
Yiyun Wang,Xinli Li,Zhi Chen,Kai Ma,Congming Tang
This work reported the coupling reaction of lactic acid (LA) to produce pyruvic acid (PyA) and propionic acid (PA) simultaneously over defect-rich MoS2 nanosheets. The process intensification linked to dehydrogenation of LA and hydrodeoxygenation of LA brings about the advantage that is not supplied additionally with oxygen and hydrogen, achieving a green and safe route. The defected structure is characterized by high-resolution transmission electron microscopy (HRTEM) and positron annihilation lifetime spectroscopy (PALS), which promotes the catalytic performance for the coupling reaction of LA. To fully understand the importance of the defected structure, the catalytic performance of defect-free MoS2 is also evaluated. It is found that the PyA/PA ratio is less than 1 and acetaldehyde selectivity is relatively high, suggesting that the produced hydrogen from the dehydrogenation of LA is insufficient for hydrodeoxygenation of LA over defect-free MoS2, and the difference of hydrogen comes from the side reactions of decarbonylation and decarboxylation of LA. Unlike the defect-free MoS2, the dehydrogenation of LA over the defect-rich MoS2 can provide sufficient hydrogen for hydrodeoxygenation of LA, so that the side reactions are drastically weakened. The widened interplanar spacing can fully expose the defect and the LA reactant molecule is more accessible to defective sites, which can endow a better catalytic activity. Surface hydrophilicity can improve adsorption and transfer, and better activity is observed over the defect-rich MoS2 and widened defect-rich MoS2. At 300 °C and a LA LHSV of 2.6 h–1 under an inert atmosphere, the catalyst offers a satisfactory total selectivity to pyruvic acid and propionic acid of about 85%, and the molar ratio of pyruvic acid/propionic acid is 1.1.
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JOURNAL OF ELECTROANALYTICAL CHEMISTRY
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2023
·
IF 4.5
Yanli Zhang,Jiuqing Xiong,Shihai Yan,Bingping Liu
Electrochemical reduction of nitrate to NH 3 is a very promising alternative reaction to the Haber-Bosch process, and it is necessary to develop the efficient electrocatalysts. In this study, a particle-support mode Co 3 O 4 catalyst was synthesized with ZIF-67 as the precursor, and then dispersed on MoS 2 nanoflowers by hydrothermal method. The Co 3 O 4 is anchored to MoS 2 by forming Co-S coordination bond. Furthermore, the particle-supported Co 3 O 4 exhibits better performance than Co 3 O 4 alone, as is manifested by higher Faradaic efficiencies and NH 3 yield rate at − 0.64 V (52.69% vs 32.03%; 4539.61 μg h −1 mg −1 cat vs 2048.63 μg h −1 mg −1 cat ), lower energy barriers (0.96 eV vs 1.19 eV), and better electronic conductivity (Bandwidth: 0.581 eV vs 0.613 eV). In addition, this research provides an effective solution to solve the aggregation problem of metal oxide nanoparticles.
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JOURNAL OF ALLOYS AND COMPOUNDS
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2023
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IF 6.2
Peng Zhao,Boxiong Shen,Guofei Shi,Jiancheng Yang,Fengju Lu,Qiqi Shi,Dongrui Kang,Chenguang Zhang
Zinc-ion batteries are receiving interest due to their high level of safety and eco-friendliness. However, the sluggish diffusion kinetics of zinc ions in the electrode limit its practical application. In this paper, rapid Zn 2+ diffusion in the MoS 2−X @NCNTs cathode is achieved by utilizing the S vacancies generated under a H 2 /Ar atmosphere and N-doped carbon nanotubes (NCNTs) derived from the pyrolysis of polyethylene and melamine. The presence of S vacancies significantly reduces the diffusion barrier of Zn 2+ , thereby promoting the transport of Zn 2+ ions. MoS 2−X @NCNTs cathode demonstrates an impressive discharge specific capacity of 220 mAh g −1 (0.1 A g −1 ) and a remarkable reversible capacity of 173 mAh g −1 (3 A g −1 ). Furthermore, the reduced adsorption energy of MoS 2−X nanosheets leads to Zn 2+ tending to preferentially insert S vacancies, resulting in a larger capacity than pure MoS 2 . This work realizes efficient storage of Zn 2+ in 2D disulfides through carbon frameworks and S vacancies. In addition, flexible zinc batteries with MoS 2−X @NCNTs cathodes have promising applications in wearable devices .
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APPLIED SURFACE SCIENCE
·
2023
·
IF 6.7
Zhongpan Zhang,Xiaoqiang Fan,Xiaoliang Ma,Minhao Zhu
To unify the lubrication characteristics of carbon spheres (CS) with high load-bearing capacity and molybdenum disulfide (MoS 2 ) with exceptional low-shear friction performance, CS wrapped with MoS 2 (C@MoS 2 ) were accomplished via an efficient and facile hydrothermal method based on the self-assembly principle. Then, 0.5 wt% C@MoS 2 particles were dispersed into Poly Alpha Olefin 40 (PAO 40) for enhancing the anti-friction/wear abilities. Subsequently, 0.5 wt% of C@MoS 2 particles were dispersed into Poly Alpha Olefin 40 (PAO 40) to enhance its anti-friction and wear-resistant capabilities. The excellent tribological properties of C@MoS 2 particles were attributed to the synergistic lubrication between bearing and filling effect of CS as well as the superior antifriction capacity of MoS 2 shell. Furthermore, the synergetic lubrication mechanism of C@MoS 2 may be segmented into different stages: I. the shell crushing stage, corresponding to the rolling bearing effect of C@MoS 2 particles at the friction interface; II. the core/shell separation stage, corresponding to the rolling bearing effect and self-repair effect of C@MoS 2 particles; III. the core/shell recombination stage, corresponding to the construction and reinforcement of protective film and the great improvement of anti-friction/wear abilities performance.
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JOURNAL OF INDUSTRIAL AND ENGINEERING CHEMISTRY
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2022
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IF 6.76
Jianing Yin,Han Yan,Meng Cai,Shijie Song,Xiaoqiang Fan,Minhao Zhu
The multiple advantages of flake MoS 2 are of great significance for improving the fretting wear resistance of bonded solid lubricant coating. Herein, the coating was constructed with liquid-phase exfoliated flake MoS 2 as lubricating filler and epoxy resin as binder. The tangential fretting characteristics for the contact of AISI 52,100 steel ball against the as-prepared coating on the AISI 1045 steel were investigated under three displacement amplitude. Results show that the average friction coefficient and wear rate of the coating with flake MoS 2 maximumly reduce by 45.5% and 89.8% than those with bulk MoS 2 . Moreover, the fretting regime is regulated by the coatings with different composition and performance. Such excellent anti-fretting features depend on: (a) the intrinsic shearing properties of flake MoS 2 ; (b) the repairing effect on the worn area; (c) the formation of uniform transfer film.
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Nano Energy
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2022
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IF 19.069
Shuoang Cao,Haojie Zou,Bei Jiang,Meilin Li,Quanping Yuan
Polymer based piezoelectric composite has attracted much attention in recent years due to its applicability in the manufacture of piezoelectric nanogenerators and sensors, high piezoelectric performance, high flexibility and easily shaping properties. In this work, ZnO with good piezoelectric properties was grown on the exfoliated MoS 2 nanosheets by employing in situ polymerization , which was then incorporated in PVDF to prepare PVDF/MoS 2 @ZnO piezoelectric composite film . The effect of various contents of ZnO on its structure and properties was emphatically discussed, as well as the mechanical energy collection and sensing performance. The results show that ZnO has been deposited on the surface of MoS 2 nanosheet to form heterostructure (MoS 2 @ZnO), as well as that the MoS 2 @ZnO can effectively promote the transformation from α phase to β phase in PVDF, by which the content of β phase can be increased from 6.2 ± 2.5 % to 54.3 ± 2.7 %. It also exhibits excellent mechanical performance and flexibility with the tensile strengthen of 37.64 ± 5.12 MPa and elongation at break of 9.77 ± 1.57 %. The longitudinal piezoelectric constant ( d 33 ) of the composite film reached a maximum value of 31 ± 4 pC·N -1 . The open-circuit voltage (V OC ) and short-circuit current (I SC ) of PVDF/MoS 2 @ZnO piezoelectric composite film reach as high as 6.22 V and 528 nA under the acting force of 100 KPa, respectively. It can charge a 1.0 μF commercial capacitor to 1.81 V in 400 s. Finally, a flexible piezoelectric sensor was fabricated to collect the pressure signals induced from human body movement (the bending of fingers, wrists and elbow joints), presenting excellent sensitive piezoelectric response with the V OC of about 0.41 V, 0.22 V and 0.32 V, respectively. The found performance indicates its feasibility for the application in wearable intelligent devices.
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ADVANCED FUNCTIONAL MATERIALS
·
2022
·Vol. 32
·期 39
·2203528
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IF 19.924
Qiuni Zhao,Wenzhe Zhou,Mingxiang Zhang,Yang Wang,Zaihua Duan,Chaoliang Tan,Bohao Liu,Fangping Ouyang,Zhen Yuan,Huiling Tai,Yadong Jiang
Endowed with rich terminal groups, good electrical conductivity, and controllable structure, transition metal carbides/nitrides (MXenes) have attracted extensive attention for potential application in gas sensor, but long-standing challenges of the MXenes (titanium carbide as the representative) are their limited selectivity and sensitivity. Herein, a high-active double transition-metal titanium molybdenum carbide (Mo 2 TiC 2 T x ) with superstrong surface adsorption (−3.12 eV) for NO 2 gas molecule is proposed, and it is further coupled with molybdenum disulfide (MoS 2 ) by interface modulation to construct an edge-enriched heterostructure. Due to the synergistic effect of strong adsorption, rich adsorption sites, and coupling interface of Mo 2 TiC 2 T x /MoS 2 composite, the as-fabricated Mo 2 TiC 2 T x /MoS 2 gas sensor exhibits an outstanding response toward NO 2 with high selectivity against various interference gases, which is well supported by density functional theory calculations. Meanwhile, the sensor exhibits a sensitivity of 7.36% ppm −1 , detection limit of 2.5 ppb, and reversibility at room temperature. A portable, wireless NO 2 monitoring system is demonstrated for gas leakage searching and dangerous warning based on Mo 2 TiC 2 T x /MoS 2 gas sensor. This work facilitates the gas sensing application of MXenes, and provides an avenue for the development of wireless sensing system in environmental monitoring and safety assurance.
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ACS Sustainable Chemistry & Engineering
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2022
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IF 9.224
Ruixue Liu,Xinli Li,Zhendi Jia,Yiyun Wang,Yanli Peng,Congming Tang,Zhi Chen,Lin Dong
The hydrodeoxygenation of lactic acid (LA) to propionic acid (PA) is of great significance for the conversion of biomass to valuable products; however, it remains a great challenge because of the trade-off between LA conversion and PA selectivity. Here, we prepared ultrathin MoS2 nanosheets containing rich sulfur vacancies by lithium exfoliation. With the increase of the lithium exfoliation time, sulfur vacancy in MoS2 is accordingly increased and LA adsorption and activation on sulfur vacancy is enhanced. Increasing sulfur vacancy lowered the valence band simultaneously and enhanced the dissociation of the H2 molecule. Density functional theory (DFT) calculations showed that the sulfur vacancy efficiently adsorbed α-C–OH of the LA molecule, weakened the C–O bond, and achieved selective conversion of LA to PA. At 215 °C, 92.4% of LA conversion and 95.8% PA selectivity were achieved over the sulfur vacancy-rich MoS2 nanosheets, which broke the activity–selectivity trade-off on hydrodeoxygenation of LA, and notably surpassed those of previously reported catalysts. More importantly, the activity of the catalyst remained almost unchanged after 8 cycles of reaction.
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JOURNAL OF ALLOYS AND COMPOUNDS
·
2022
·
IF 6.371
Baoyuan Man,Guilin Wang,Zhen Li,Shicai Xu,Chonghui Li,Jing Yu,Chao Zhang,Xiaofei Zhao
To obtain more information and reduce false alarms during molecular identification, the Molybdenum disulfide (MoS 2 ) spaced gold (Au)-silver (Ag) bimetal composite structure for surface-enhanced Raman scattering (SERS)-surface plasmon resonance (SPR) sensor is proposed. The sensor combines the advantages of D -shape plastic optical fiber ( D -POF), MoS 2 -spaced Au and Ag bimetallic composite structure, showing excellent sensitivity. Compared with the Ag/Au bimetallic D -POF experiment (the sensitivity is 2163.57 nm/RIU), the sensitivity of proposed sensor was improved effectively and calculated as 2473.37 nm/RIU in a range of alcohol solution. To evaluate the SERS activity of the proposed sensor, Rhodamine 6 G (R6G) molecules has been successfully detected by Au/MoS 2 /Ag D -POF sensor with low limited of detection (LOD) of 10 −9 M. Meanwhile, the proposed sensor successfully detected glucose with a concentration of 0.625~20% by observing the change of resonance wavelength and the characteristic peak of SERS signal. The highly sensitive spectral signals, richer and more comprehensive information can be obtained to reduce false positives in identification of biomolecules.
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CARBON
·
2022
·
IF 11.307
Xiaoqiang Fan,Xiaopeng Li,Zhuang Zhao,Zhaofan Yue,Peng Feng,Xiaoliang Ma,Hao Li,Xiangyuan Ye,Minhao Zhu
Reduced graphene oxide (rGO)/molybdenum disulfide (MoS 2 ) heterostructure nanosheets (rGO-MoS 2 -1) were synthesized via vertically growing of MoS 2 on rGO skeleton using a facile one-pot hydrothermal method. Toward high-performance lubrication additive, the rGO-MoS 2 -1 in industrial gear oil shows extraordinary dispersity and stability because its steric hindrance effect restrains the aggregation and settling tendency. More importantly, its introduction can significantly reduce the friction (∼16.7%) and wear (up to 80%) under the sliding contact. The characterization and analysis on the worn surfaces reveal that good dispersion stability, the formation of rGO-MoS 2 -based lubrication protective film, and the lower shear strength induced by the inherent lattice mismatch between rGO and MoS 2 are the key factors in the friction reduction and protection the tribo-interfaces against wear.
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Journal of Water Process Engineering
·
2023
·
IF 7
Jingyang Li,Haiyu Cao,Hongying Qi,Yuexiang Li,Sha Zhu,Xue Ye,Jintao Zhang,Zifeng Yu,Jiao Zhu,Xin Zhao
A series of CoFe-LDHs@MoS 2 -x (x = 0.1, 0.2 and 0.5) samples were successfully synthesized to activate peroxymonosulfate (PMS) for tetracycline (TC) removal. With the introduction of MoS 2 could promote the catalytic performance via accelerating the Fe 2+ /Fe 3+ and Co 2+ /Co 3+ cycle. About 98.8 % of TC could be removed over 12 min under a neutral condition in the CoFe-LDHs@MoS 2 -0.2/PMS system, which was 4.4 times higher than that of CoFe-LDHs/PMS system. The main reactive oxygen species (ROS) in CoFe-LDHs@MoS 2 -0.2/PMS system were also explored by using quenching and free radical capture experiments. The singlet oxygen ( 1 O 2 ) played a major role for the TC removal. Besides, the decomposition pathways of TC were deduced by UPLC-QTOF/MS, and the stability of catalysts had also been studied. This work provided theoretical and experimental basis for designing and preparation more effective heterogeneous catalysts for PMS activation .
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INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
·
2021
·
IF 6.953
Hua-jin Zeng,Li-jun Sun,Ling-bo Qu,Ran Yang
In present study, a novel glutathione functionalized MoS 2 quantum dots (GSH-MoS 2 QDs) was synthesized from sodium molybdate dehydrate and glutathione by using a one-pot hydrothermal method . After they were characterized, the influence of GSH-MoS 2 QDs on amyloid aggregation of bovine serum albumin (BSA) was investigated by various analytical methods including thioflavin T fluorescence assay , circular dichroism and transmission electron microscope . Moreover, the effect of GSH-MoS 2 QDs on cytotoxicity induced by BSA amyloid fibrils and cell penetration were evaluated by MTT assay and confocal fluorescence imaging, respectively. The results indicated that the GSH-MoS 2 QDs not only had good water solubility, excellent biocompatibility and low cytotoxicity, but also could obviously inhibit the aggregation of BSA and depolymerize the formed BSA aggregates. The data obtained from this work demonstrated that the GSH-MoS 2 QDs is expected to become a candidate drug for the treatment of amyloid-related diseases.
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PubMed
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