JOURNAL OF ALLOYS AND COMPOUNDS
·
2019
·
IF 4.175
Fan Yang,Zhanfang Cao,Jing Wang,Shuai Wang,Hong Zhong
In this work, in situ growth of thin layer and highly catalytic activity molybdenum disulfide (MoS 2 ) was successfully synthesized by spatial confinement effect of Mg–Al layered double hydroxide (Simplified as LDH below). Due to the unique spatial confinement effect and electropositivity of the LDH layer, MoS 2 will controllable in situ grows along the surface of LDH layer, the MoS 2 synthesized in LDH tends to monolayer or thin layer instead of growing into a flower-like structure, this new strategy is different from vapor deposition, exfoliation and laser irradiation to prepare thin layer MoS 2 . Meanwhile, the conglomerate structure of LDH is opened and converted to thin layer by the growth of MoS 2 , too. The rich defects carried by thin layer LDH also help to improve the catalytic ability of MoS 2 . MoS 2 /LDH can absorb the light from ultraviolet to visible light region, The prepared MoS 2 /LDH composite was used as a photocatalytic material, and was found to be the best photocatalyst degrading about 96% of the MB solution (20 mg/L) after 180 min.
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TRIBOLOGY INTERNATIONAL
·
2023
·
IF 6.2
Chen Zhao,Xingwei Wang,Chuanpeng Li,Yu Liu,Shuang Sun,Shuangshuang Yang,Yuchen Sun,Zhenjun Peng,Qiangliang Yu,Meirong Cai,Bo Yu,Feng Zhou,Weimin Liu
Sodium dodecyl sulfate (SDS) and 8-Hydroxyquinoline (8-HQ) intercalated layered double hydroxides (LDH) sheets were in-situ formed in MAO layer to prepare a composite coating (CI@LDH-MAO) on AZ31 magnesium alloy . This composite coating demonstrates commendable anti-corrosion performance, primarily attributed to the formation of LDH sheets and insoluble Mg(HQ) 2 compounds. The electrochemical impedance modulus of the composite coating surpasses that of the MAO coating by three orders of magnitude after immersion of 360 h. Concurrently, the CI@LDH-MAO composite coating exhibits exemplary tribological properties, characterized by a friction coefficient of approximately 0.19 and a wear rate of (11.5 ± 1.5)× 10 −6 mm 3 /(N·m). This outstanding tribological performance can be ascribed to enhanced interaction of lubricants with the friction interface by 8-HQ and SDS anions.
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OPTICAL MATERIALS
·
2023
·
IF 3.9
Shuaibing Guo,Zhaokai He,Siyuan Ma,Zhe Jiang,Jia Dong,Jinbiao Jia
NiO x is one of the most promising inorganic hole transport materials for perovskite solar cells . However, lots of fabrication methods refer to NiO x are limited in n-i-p type perovskite solar cells. Because the deposition procedure of NiO x film such as polar solvents and high temperature process is seriously incompatible with perovskite light-absorption underlayers. In this work, highly crystalline NiO x nanocrystals are prepared using solvothermal method under the presence of long-chain oleylamine molecules. The resulted NiO x nanocrystals can be easily dispersed in weak-polar toluene and form films on perovskite layer without annealing procedure. The n-i-p type device with NiO x hole transport layer achieves an efficiency of 10.34%. Later, Mg 2+ with different molar ratios are incorporated into the NiO x nanocrystals. It is found that introducing a certain amount of Mg 2+ benefits to improve the ratio of Ni 3+ /Ni 2+ , thereby changing the work function and increasing the hole conductivity. As a result, the n-i-p type device with Mg-NiO x hole transport layer yields an improved efficiency of 12.41%.
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PROPELLANTS EXPLOSIVES PYROTECHNICS
·
2023
·Vol. 48
·期 6
·e202300022
·
IF 1.8
Ximing Zhang,Peng Jin,Wenhao Liu,Tianqi Li,Shuang Liu,Wu Yang,Cong Zhu,Mengze Zheng,Yunjun Luo
In this work, the energetic thermoplastic polymers were synthesized with different ratios of energetic prepolymer glycidyl azide (GAP) and isophorone diisocyanate (IPDI), and used as the binder to prepare fuel-rich propellants based on Al−Mg. The results showed that energetic thermoplastic polymer enabled the fuel-rich propellant a faster flame spread, greater flame strength, and a stronger injection effect of metal droplets. The weight loss (Δ m ) of the propellants increased with GAP content, while the weight loss rate ( D max ) increased similarly. The Δ m increased from 7.92 % to 9.86 % and D max from −0.23 % ⋅ °C −1 to −0.35 % ⋅ °C −1 in the range 100–256.5 °C. The propellant with the highest GAP content (85GAP-Prop) had the lowest apparent activation energy (150.77 kJ ⋅ mol −1 ). The average pressure rate of 85GAP-Prop burning in a closed bomb reached 7.67 MPa ⋅ s −1 and the maximum instantaneous pressure rate could reach 16.52 MPa ⋅ s −1 , significantly higher than the other propellants. The combustion products analysis indicated that the higher GAP content in the GAP-IPDI energetic thermoplastic polymer more significantly reduced the agglomeration of Al particles and improved the loosening of the combustion products. The rapid combustion gas generation characteristic and energy release of energetic thermoplastic polymer enhanced the combustion characteristics of the fuel-rich propellant based on Al−Mg, which promoted dispersion level between the metal droplets. This work provides insight into the combustion principles and performance improvements of fuel-rich propellant based on Al−Mg.
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JOURNAL OF INDUSTRIAL AND ENGINEERING CHEMISTRY
·
2019
·
IF 4.978
Fekadu Tadesse Bekena,Hairus Abdullah,Dong-Hau Kuo,Misganaw Alemu Zeleke
Novel Mg-doped Zn(O,S) nanoparticles were synthesized by a chemical precipitation process at 90 ℃ and the prepared nanoparticles were characterized by XRD, SEM, HRTEM, XPS, UV–vis, DRS, PL, EIS, and photocurrent response. The photocatalytic reduction for the 4-nitrophenol using Na 2 SO 3 under UV light irradiation showed that Mg–Zn(O,S)-2.5 exhibited higher activity compared with other samples. 96.7% of 4-nitrophenolate ion reduced into 4-aminophenol within 45 min. Mg–Zn(O,S)-2.5 was also tested for hydrogen evolution, where the rates of 1035 μmol/g for the 4-NP-free sample and 705 μmol/g for the 4-NP-added one were achieved. Finally, the stability and reaction mechanism was mentioned.
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Energy Storage Materials
·
2019
·
IF 0
Jing Tian,Xuejun Zhou,Qingping Wu,Chilin Li
Mg-based batteries modulated by Li-salt additive can bypass the sluggish Mg solid diffusion at cathode side by kinetically better Li intercalation. However for this dual-salt system the highly electroactive cathodes endowed with high intrinsic conductivity and multi-electron transfer are still lacking, especially under large-sized grains and their high loading. Here a rhodizonate organic salt pre-pillared by K-ions (K 2 C 6 O 6 ) is proposed as high-rate cathode for Li-salt mediated Mg batteries. Under a high loading of 70 wt%, well-crystallized K 2 C 6 O 6 composed of ultra-large micro-sized grains (up to 30 μm) shows a reversible capacity more than 300 mA h/g at 0.1 C (based on three electron transfer), and up to 200, 130 and 60 mA h/g at 2 C, 5 C and 10 C respectively. The high bulk electron/ion conductivity and low solubility are responsible for such a superior performance based on fast Li-K electrochemical exchange and highly reversible Li intercalation without the assistance of nano-sizing, as a consequence of optimization and stabilization of desired electron structure and open framework by K-ion pre-supporting (instead of Li/Na-pillaring) and Mg-ion trapping between C 6 O 6 2- layers. These large monoliths of K 2 C 6 O 6 do not undergo serious grain fracture after long-term cycling, and at that time the Mg anode still remains compact and dendrite-free.
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CHEMOSPHERE
·
2019
·
IF 5.108
Jian Lu,Qi Sun,Jun Wu,Guangcan Zhu
Techniques for reutilization of the discarded bischofite are limited while efficient recovery of the Mg(OH) 2 nanoparticles from water during the synthesis and reuse processes is a challenge. In this study, the Fe 3 O 4 @Mg(OH) 2 core-shell magnetic nanoparticles were firstly prepared from discarded bischofite and used as catalyst for improving the ozonation of metronidazole (MNZ). The removal rate constant of MNZ increased by 694.7% using Fe 3 O 4 @Mg(OH) 2 . Compared with the Mg(OH) 2 control, the MNZ removal rate constant of Fe 3 O 4 @Mg(OH) 2 treatment was almost tripled. The persistent high catalytic activity of the Fe 3 O 4 @Mg(OH) 2 catalyst was observed since the MNZ removal rate constant decreased by just 13.2% in the third reuse run. The Fe 3 O 4 @Mg(OH) 2 primarily enhanced ozone decomposition through producing hydroxyl radicals . The MNZ removal rate constant increased from 0.075 min −1 to 0.643 min −1 as catalyst dose increased from 0 to 0.6 g L −1 while it decreased by 96.0% when its initial concentration increased from 10 to 200 mg L −1 . The maximum removal rate constant was observed at 25 °C when temperature increased from 15 °C to 35 °C. The Cl − , HCO 3 − , SO 4 2− , Ca 2+ , Mg 2+ ions could jeopardize MNZ degradation. The antibacterial activity of MNZ was eliminated after catalytic ozonation while the mineralization efficiency was almost doubled. The nitro group reduction and the cleavage of hydroxyethyl bond were two main transformation pathways of MNZ. These findings suggest that Fe 3 O 4 @Mg(OH) 2 nanoparticle made from discarded bischofite is the promising catalyst for the ozonation of antibiotics in the terms of water purification practice and reutilization of the bischofite.
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PubMed
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Catalysis Science & Technology
·
2018
·Vol. 8
·期 10
·2624-2635
·
IF 5.365
Jingxia Tian,Wei Chen,Peng Wu,Zhirong Zhu,Xiaohong Li
A Cux–Mgy–Zrz/SiO2 catalyst with a total metal loading of 60 wt% prepared by a deposition–precipitation method was applied for the selective hydrogenation of ethylene carbonate to methanol and ethylene glycol in a fixed-bed reactor. As a result, the Cu8–Mg1–Zr0.47/SiO2 catalyst furnished 99% ethylene carbonate conversion with 85% selectivity to methanol and 99% selectivity to ethylene glycol under the optimized reaction conditions. Moreover, the Cu8–Mg1–Zr0.47/SiO2 catalyst also showed a good lifetime and neither the activity nor the selectivity decreased the during 208 h test. The reaction was found to depend sensitively on the Cu particle size, the surface acidity and the catalyst surface composition. The synergistic effect of balanced Cu0 and Cu+ sites was considered to play a critical role in attaining high yields of methanol and ethylene glycol. Boric oxide also had a positive effect on the hydrogenation of ethylene carbonate, affording higher selectivity to methanol under much milder conditions.
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ACS Photonics
·
2018
·
IF 6.88
Fei Chen,Zhenyang Liu,Zhongyuan Guan,Zheming Liu,Xu Li,Zhenbo Deng,Feng Teng,Aiwei Tang
Colloidal ZnO nanoparticles (NPs) are widely used as an electron-transporting layer (ETL) in the solution-processed quantum-dot light-emitting diodes (QD-LEDs). However, the inherent drawbacks including surface defect sites and unbalanced charge injection prevent the device from realizing their further performance enhancement. In this work, a series of Mg doped ZnO (ZnO:Mg) and chloride-passivated ZnO (Cl@ZnO) NPs were synthesized by using a solution-precipitation strategy, and they exhibited tunable optical bandgaps and upward-shift of conduction-band maximum (CBM). Solution-processed QD-LEDs based on cadmium-free Cu-In-Zn-S/ZnS (CIZS/ZnS) nanocrystals (NCs) were fabricated by using ZnO:Mg and Cl@ZnO NPs as the ETLs, whose maximum peak external quantum efficiency (EQE) was nearly twice as high as that of QD-LEDs using ZnO NPs as the ETL (EQE = 1.54%). To take advantage of the benefits of ZnO:Mg and Cl@ZnO NPs, Cl@ZnO:Mg NPs were developed through the integration of Mg doping and Cl-passivation. Surprisingly, the cadmium-free QD-LEDs with the Cl@ZnO:Mg NPs as the ETL exhibited a maximum peak EQE of 3.72% and current efficiency of 11.08 cd A–1, which could be enhanced to be 4.05% and 12.17 cd A–1 by optimizing the Cl amount, respectively. The positive effects of the Mg doping and Cl-passivation on the cadmium-free QD-LEDs are primarily ascribed to the reduced electron injection barrier of ETL/the emitting layer interface and slower electron mobility, which can be verified by the ultraviolet photoelectron spectroscopy (UPS) measurements and current density–voltage characteristics of electron-only devices.
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Journal of Energy Storage
·
2024
·
IF 8.9
Congwen Duan,Haimei Wang,Jinhui Wu,Ting Qu,Yuling Zhang,Dong Fu,Lianxi Hu,Fei Wang,Dongsheng Lai,Yueru Dai,Ying Wu
Mg/MgH 2 stands out as an excellent hydrogen storage material due to its abundant presence and its capacity for high hydrogen storage density. However, the sluggish hydrogenation/dehydrogenation kinetics make it unsuitable for solid-state hydrogen storage. To tackle these challenges, the MgH 2 -Co@Pd‑c arbon nanotubes composite was created through ball milling , and its hydrogenation/dehydrogenation behavior was examined. The inclusion of Co@Pd notably enhanced the kinetics of hydrogenation/dehydrogenation in Mg/MgH 2 . The Mg-Co@Pd‑c arbon nanotubes composite achieved an absorption of 7.30 wt% H 2 in just 8 h of milling. The study proposed an energy conversion model to investigate the enhanced properties of Mg/MgH 2 . The addition of Co@Pd substantially reduced the activation energy (Ea) for hydrogen desorption to 81.9 kJ/mol. Furthermore, Transmission Electron Microscope and Density Functional Theory simulations were employed to understand how Co@Pd enhances the properties of Mg/MgH 2 . The improved hydriding/dehydriding kinetics of Mg/MgH 2 are likely closely linked to both the confining impact of c arbon nanotubes and the synergistic interplay of the “spillover” and “hydrogen pump” effects facilitated by the Co@Pd bimetallic catalysts . The excellent hydriding/dehydriding behavior is ascribed to the electron spillover and the phase transformation of Mg 2 Co/Mg 2 CoH 5 and Mg 6 Pd/Pd. These findings offer new insights into the new insights into the rational design of Co@Pd bimetallic catalysts, which are expected to be an optimal solution for supported catalysts in Mg-based solid-state hydrogen storage systems.
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ZEITSCHRIFT FUR ANORGANISCHE UND ALLGEMEINE CHEMIE
·
2015
·Vol. 641
·期 11
·1953-1958
·
IF 1.16
Yunsheng Liu,Dajiang Mei,Jingli Xu,Yuandong Wu
Sodium magnesium selenite NaMg 2 (OH)(SeO 3 ) 2 and rubidium zinc selenite RbZn 2 (OH)(SeO 3 ) 2 were prepared by hydrothermal reactions. The crystal structures of the title compounds were determined by single-crystal X-ray diffraction. NaMg 2 (OH)(SeO 3 ) 2 crystallizes in the orthorhombic space group Pnma (no. 62) with lattice parameters a = 13.1919(10), b = 6.0415(4), c = 8.2182(6) Å, and Z = 4 and RbZn 2 (OH)(SeO 3 ) 2 crystallizes in the triclinic space group P (no. 2) with lattice parameters a = 4.8698(5), b = 7.3446(8), c = 11.7796(12) Å, α = 82.554(3), β = 78.456(2), γ = 71.603(3)°,and Z = 2. The structure of NaMg 2 (OH)(SeO 3 ) 2 is a three-dimensional framework consisting of edge-sharing MgO 6 octahedra and trigonal pyramidal SeO 3 2– groups, whereas the structure of RbZn 2 (OH)(SeO 3 ) 2 is a two-dimensional layers structure consisting of corner-sharing [Zn 2 O 7 ] dimers linked by trigonal pyramidal SeO 3 2– groups. The compounds were characterized by the solid state UV/Vis/NIR diffuse reflectance, and FT-IR spectroscopy.
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Journal of Materials Chemistry B
·
2016
·Vol. 4
·期 14
·2498-2511
·
IF 4.872
Zhaojun Jia,Pan Xiong,Yuying Shi,Wenhao Zhou,Yan Cheng,Yufeng Zheng,Tingfei Xi,Shicheng Wei
The design of functional biomaterials that respond intelligently to external stimuli has become a rapidly growing area with widespread interest. This work contributes to the development of a feedback-active anticorrosion system with intriguing self-healing ability to protect magnesium (Mg) from biocorrosion. The system was constituted by an inner micro/nano-porous, ceramic-like pre-coating developed readily from the substrate, and an outermost inhibitor (nanosized cerium (Ce) oxides) containing chitosan (CS) multilayers. Here, the pre-coating acted as both an “anchoring” and a “barrier” layer to acquire structural integrity and improved impedance, respectively. Green CS served as cargo for Ce to be entrapped, harnessing Ce–NH2 complexation chemistry. The coating barrier properties were evaluated by electrochemical impedance spectroscopy. The active corrosion inhibition was assessed by immersion degradation tests with respect to Mg2+ release, pH alteration, crack development, and scanning Kelvin potential. To our delight, the coatings effectively protected the substrate from biocorrosion in vitro compared with bare alloys. Putatively, the pH-triggered formation of Ce oxide precipitation, along with the pH-buffering activity and movable swelling capacity of CS macromolecules, should have contributed to restraining the anodic activity and healing the cracks/defects dynamically. Furthermore, the coated substrate had the biocompatibility to elicit better attachment and growth of osteoblasts.
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