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%.
研究领域:
材料科学
·
能源科学
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产品关联
DOI
高影响因子
CERAMICS INTERNATIONAL
·
2025
·
IF 5.6
Jie Zhou,Siyuan Jin,Ruizhi Wu,Xiaochun Ma,Mengyao Pang,Zhe Yu,Guixiang Wang,Jinghuai Zhang,Boris Krit,Sergey Betsofen,Vitalii Neshchimenko,Buzikov Ruslan,Min Qiu,Yurong Yang,Jiaming Chen
Microarc oxidation (MAO) coatings incorporating hexagonal boron nitride (h-BN) nanoparticles were synthesized on Mg-Li alloys. The effects of h-BN nanoparticle concentration on the structure, phase composition, and tribological properties of the MAO coatings were systematically investigated. The results indicate that the addition of h-BN nanoparticles induces the formation of protrusions on the coating surface, varied in size and distribution with the concentration of h-BN particles. The protrusions are advantageous for enhancing the wear resistance of the coating, owing to the effective reduction of the contact area and the lubricating impact of the released h-BN particles during wear. The thickness and hardness of the coating contained h-BN particles are significantly elevated. At an optimal h-BN concentration of 7 g/L, the composite coating exhibits the lowest average coefficient of friction (COF = 0.59) and the minimum wear rate (W = 2.6 × 10 −6 mm 3 /N·m), thereby demonstrating superior tribological performance.
研究领域:
材料科学
·
表面工程
✓ 已验证
DOI
高影响因子
CATALYSIS TODAY
·
2017
·
IF 4.636
Tianxin Li,Qian Li,Hongyu Long,Kuo-Chih Chou,Qun Luo
A modified Chou model with parameters of temperature ( T ), initial hydrogen pressure ( P 0 ), enthalpy change (Δ H ) and entropy change (Δ S ) is proposed in consideration of thermodynamic driving force. The meaningful activation energy E v can be calculated for the negative temperature dependence of hydriding reaction in hydrogen storage materials. This model is verified by the hydriding/dehydriding experimental data of (LaNi 5 ) 1− x Mg x ( x = 0, 0.018, 0.041, 0.063). The calculated results indicate that the hydriding kinetics of (LaNi 5 ) 1− x Mg x alloys are controlled by diffusion of hydrogen atom in hydride. The addition of small amount of magnesium improves the kinetic performance of LaNi 5 slightly. Furthermore, the modified Chou model was compared with the previous model that successfully explain the negative temperature depending hydrogenation reaction of Mg-based alloys. The fitting results show that the modified Chou model can describe the hydrogen absorption kinetic mechanism of negative temperature dependent materials more accurately.
研究领域:
材料科学
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能源化学
·
物理化学
·
合金设计
·
储氢技术
✓ 已验证
DOI
高影响因子
ELECTROCHIMICA ACTA
·
2024
·
IF 5.5
Qing Zhou,Kaiyu Lin,Yongxin Liu,Guohan Sun,Shumei Wang,Haiyun Zhai
A novel nonenzymatic electrochemical sensor with high sensitivity for detecting organic phosphate (OPS) in medicinal herbs was fabricated based on a Mg-Al layered double hydroxide (Mg-Al LDH) nanocomposite glassy carbon electrode (GCE) modified with a poly-m-amino-benzenesulfonic acid (p-m-ABSA) film. Depositing Mg-Al LDH nanocomposites onto the surface of the p-m-ABSA composite resulted in an effective electrical response by increasing the electrode surface area and enhancing the electron transfer process, so the electrocatalytic activity was significantly enhanced. The research illustrated that the fabricated sensor (Mg-Al LDH/p-m-ABSA/GCE) exhibited strong affinity, high sensitivity, and selectivity towards methyl parathion (MP) and fenitrothion (FNT). Scanning electron microscopy (SEM) was used to characterize the surface morphology of the modified electrode and showed that the p-m-ABSA film and a few p-m-ABSA nanoparticles were coated on the surface. The surface area of the electrode was further enlarged by Mg-Al LDH owing to their layered nanostructure. Under optimal conditions, the anodic current had a linear relation equal to 0.1∼20.0 µM MP and 0.01∼50.0 µM FNT, with detection limits (S/ N = 3) of 33.0 nM MP and 3.5 nM FNT, respectively. Furthermore, Mg-Al LDH/p-m-ABSA/GCE was successfully used for the detection of MP and FNT in Astragalus and Magnolia medicinal herb samples.
研究领域:
分析化学
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环境科学
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药学
✓ 已验证
产品关联
DOI
高影响因子
ACS Omega
·
2021
·
IF 3.512
Chunling Xin,Yang Ren,Zhaofei Zhang,Lili Liu,Xia Wang,Jinmei Yang
Hierarchical porous composite Mg-MOF-74/MCFs were successfully synthesized using a simple and facile method under in situ solvothermal conditions. Textural structures and morphologies of the composites were characterized by X-ray diffraction (XRD), N2 adsorption–desorption isotherms, and scanning electron microscopy (SEM), transmission electron microscopy (TEM), and thermogravimetric analysis (TGA). The results demonstrate that a large amount of nanosized Mg-MOF-74 particles is incorporated into the pores of mesocellular siliceous foams (MCFs) without remarkable aggregation and the composites possess microporous and mesoporous characteristics of both components. In addition, CO2 adsorption properties of the composites were tested in a fixed bed with/without hydrothermal treatment. The total CO2 adsorption capacities were calculated by breakthrough curves. The CO2 adsorption capacity of the composites reaches 1.68 mmol/g, which is smaller than that of pristine Mg-MOF-74. However, the total CO2 adsorption capacity of the composites after hydrothermal treatment reaches 2.66 mmol/g, which is larger than that of Mg-MOF-74 (2.39 mmol/g) under the same condition. XRD patterns and SEM images of the composites demonstrate that the hydrothermal stability and CO2 adsorption performance of the composites were improved compared with those of pristine Mg-MOF-74 after hydrothermal treatment.
研究领域:
材料科学
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环境科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
·
2024
·
IF 7.7
Zhiheng Luo,Jianxiong Ma,Yan Wang,Yuhan Du,Yujie Liu,Wei Zhang,Yuxiao Lai,Xinlong Ma
The management of bone defects, particularly those with irregular geometries resulting from osteoporotic fractures, remains fraught with challenges. Microspheres have emerged as a promising vehicle for tissue engineering, distinguished by their controlled release, safety, and ease of application. Various bioactive components are integrated into microspheres to improve their performance. Metal-organic frameworks, formed from metal ions interconnected by organic ligands, are increasingly utilized in tissue engineering. Specifically, magnesium-based MOFs are notable for their broad applicability; Mg 2+ ions are instrumental in bone reconstruction and repair, facilitating osteogenesis, angiogenesis, antibacterial effects, and anti-inflammatory properties. Mg-MOF was synthesized using magnesium chloride and gallic acid, and it was incorporated into gelatin microspheres to create Gel@Mg-MOF composite microspheres. Leveraging gelatin's biocompatibility, controlled release, and biodegradability, the composites' biocompatibility was evaluated through toxicity and adhesion assays. Moreover, the osteogenic and angiogenic potentials of the Gel@Mg-MOF microspheres were assessed, alongside their capacity for ROS scavenging. Results suggest that controlled Mg 2+ release from Gel@Mg-MOF microspheres promotes osteogenic activity in RBMSCs and enhances angiogenic potential in HUVECs. Additionally, the gallic acid-containing composite microspheres exhibited antioxidative properties. Collectively, the findings suggest that Gel@Mg-MOF microspheres could provide effective support for bone defect repair, with potential for clinical deployment.
研究领域:
组织工程
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生物材料
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骨再生
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF CHEMICAL TECHNOLOGY AND BIOTECHNOLOGY
·
2018
·Vol. 94
·期 1
·167-177
·
IF 2.587
Xuejuan Cao,Junnan Wei,Huai Liu,Xinyue Lv,Xing Tang,Xianhai Zeng,Yong Sun,Tingzhou Lei,Shijie Liu,Lu Lin
BACKGROUND γ-Valerolactone (GVL) is a versatile biomass-derived platform molecule that could serve as a building block to produce chemicals, materials and fuels, but the production of GVL from biomass via a cost-competitive method is challenging. In this contribution, a robust Cu─Mg oxide was prepared as an efficient bifunctional catalyst for both H 2 production by MeOH reforming and hydrogenation of methyl levulinate (ML) to GVL in MeOH medium. RESULTS Cu 0.87 Mg 0.13 O x prepared by a urea hydrolysis method offered a GVL yield up to 90.6% at 220°C in 4 h without external hydrogen. This catalyst could be reused for at least seven consecutive cycles without loss of its activity. Notably, Cu 0.87 Mg 0.13 O x also provided nearly 70% GVL yield in methanolysis products of cellulose in the presence of humins. Characterization of the catalyst indicates that the incorporation of MgO greatly facilitates the stabilization of Cu + species that possess a better catalytic performance in ML hydrogenation compared with metallic Cu. CONCLUSION This robust Cu 0.87 Mg 0.13 O x could greatly contribute to develop a highly facile and desirable two-step strategy for GVL production from cellulose, through the integration of ML production by methanolysis of cellulose, H 2 formation by MeOH reforming and ML hydrogenation in MeOH medium. © 2018 Society of Chemical Industry
研究领域:
化学工程
·
可再生资源化学
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产品关联
DOI
高影响因子
IONICS
·
2019
·Vol. 25
·期 11
·5353-5360
·
IF 2.289
Ren Xiaoying,Xu Tao,Du Junlin,Pu Zhaohui,Wang Runbo,Wu Zhu
High-temperature battery system operated at or below 300 °C is highly desired for geothermal borehole applications. However, it remains a challenge to find suitable electrode materials meeting the need of wide borehole temperature. In this study, the discharge performance of Li 2 MoO 4 /LiNO 3 -KNO 3 /Li-Mg-B alloy battery system was studied over the temperature range of 150~300 °C with different current densities ranging from 10 to 30 mA cm −2 . The electrochemical test result showed that the single cell delivered maximum discharge capacity at 250 °C, with value of 1178.6 mAh g −1 at a current density of 10 mA cm −2 . Besides, it is found that the discharge capacities of the single cell increased as the current density rose at 300 °C attributed to the enhanced ionic conductivity at high temperature. As a result, the Li 2 MoO 4 /LiNO 3 -KNO 3 /Li-Mg-B alloy system is capable of being used in instrumentation for geothermal and oil/gas borehole explore between 200 and 250 °C.
研究领域:
材料科学
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能源工程
✓ 已验证
产品关联
DOI
高影响因子
FUEL
·
2023
·
IF 7.4
Xiaoqian Feng,Yilin Zhao,Shenghua Liu,Kun Wang,Baoshan Liu,Qijian Zhang,Huan Wang,Yonghua Zhao,Jing Liu,Peng Zhang,Lian Gao
Dry reforming of methane (DRM) suffers catalysts deactivation due to severe coking. Ni/MgO-Al 2 O 3 is a promising system for DRM catalysts with high coking resistance, as the addition of MgO in Ni/Al 2 O 3 catalysts can improve the alkalinity of the support and enhance the metal-support interaction. However, so far the activity and stability of Ni/MgO-Al 2 O 3 is still unsatisfactory while the role of Mg addition remains unclear. In this paper, a series Ni 0.5 /xMgO-Al 2 O 3 catalysts with flower-like hollow sphere morphology and high surface area were synthesized via a facile hydrothermal method. Appropriate Mg addition promotes the formation of NiAl 2 O 4 while more Mg addition leads to the formation of Ni x Mg y O. Both cases can enhance the MSI of the catalysts without changing the morphology of the catalyst. More Mg addition also leads to stronger CO 2 adsorption via improving the alkalinity. Nevertheless, overdose of Mg results in weaker MSI and the blockage of Ni active sites. Ni 0.5 /0.5MgO-Al 2 O 3 with moderate Mg addition shows excellent activity (CH 4 ∼ 75 %, CO 2 ∼ 85 %) and stability (>100 h) at a high GHSV = 144000 ml/g cat ·h −1 and 800 °C with nearly no coking formation (<0.8 wt%). This work helps reveal the role of MgO addition in Ni/Al 2 O 3 systems and gives new insights into the design of DRM catalysts with high activity and stability.
研究领域:
化学工程
·
催化材料科学
✓ 已验证
产品关联
DOI
高影响因子
FUEL PROCESSING TECHNOLOGY
·
2025
·
IF 7.7
Jie Yao,Hao Liu,Wei Liu,Jianxin Nie,Shi Yan,Xueyong Guo
Metal fuels are widely used in energetic materials to improve their energy release. Al Si alloy fuel is an aluminum-based alloy fuel, and its slow reaction rate limits its potential application in energy material systems. Herein, Al-Si-Mg AlSi9Mgx alloy fuel had been designed and successfully prepared by gas atomization to achieve excellent reactivity characteristics. The reaction characteristics of the fuel were systematically measured by thermal analysis (TG-DSC), bomb calorimeter, volumetric explosion vessel system and laser ignition measurement. Due to the addition of highly active magnesium, the activation energy of alloy fuel was reduced, and the combustion efficiency was increased to more than 99 %, and the ignition delay time was reduced by 6.7 ms and 33.6 ms respectively. Combustion of potassium perchlorate (KP) mixtures shows that AlSi9Mgx alloy fuels had a faster flame propagation rate, 22.814 mm/s and 42.543 mm/s. The superior reaction properties of AlSi9Mgx alloy fuel are due to the presence of internal solid solution Mg or low melting point alloy compound. This work and design provide a reliable method for optimizing the energy output of alloy fuels.
研究领域:
材料科学
·
能源工程
·
冶金学
·
化学工程
✓ 已验证
产品关联
DOI
高影响因子
Materials Today Communications
·
2025
·
IF 4.5
Zefeng Guo,Jianhua Zhang,Yongke Yan,Guoyu Zhang,Dongdong Liu,Zhipeng Lei,Yuanyuan Li,Lu Li
Achieving both low dielectric loss (tan δ ) and high temperature stability of ceramic capacitors can greatly broaden their potential application. In this study, the effects of Mg and Al co-substitution on the microstructure and dielectric properties of CCTO-based ceramics were investigated in CaCu 3- x Mg x Ti 4- x Al x O 12 ( x = 0, 0.025, 0.050, and 0.075) ceramics prepared by a sol-gel method. XRD analysis shows that the primary crystalline phase of CCTO is formed in all samples, indicating that Mg 2 + and Al 3+ have entered the lattice. SEM results reveal the co-substitution of Mg and Al inhibits the grain growth, leading to an increase in grain boundary density. All co-substituted samples exhibited low tan δ and excellent temperature stability. Notably, CaCu 2.95 Mg 0.05 Ti 3.95 Al 0.05 O 12 ceramics exhibited an extremely low tan δ of 0.007 (at 10 3 Hz) and its dielectric constant maintained excellent stability over a broad temperature spectrum (−125 to 150 °C), meeting the commercial standards for X8P capacitors. The reduction of tan δ is mainly attributed to the inhibition of grain growth in Mg and Al co-substituted samples, which increases grain boundary density and subsequently suppresses the mobility of oxygen vacancies, leading to an increase in grain boundary resistance. Furthermore, the improvement in temperature stability is ascribed to the reduction in the content of oxygen vacancies and the suppression of electron transitions between Ti 4+ and Ti 3+ as well as Cu 2+ and Cu + in Mg and Al co-substituted samples, resulting in an increase in grain boundary activation energy. These novel findings are hoping to contribute to not only the fabrication of new CCTO-based ceramics with extremely low tanδ and excellent temperature stability but also the application of CCTO-based ceramics at a very broad temperature range in electronic devices, new energy vehicles, aerospace, and polar scientific research equipment.
研究领域:
材料科学
·
电子工程
✓ 已验证
产品关联
DOI
高影响因子
CATALYSIS COMMUNICATIONS
·
2018
·
IF 3.463
Xilei Lu,Lixin Wang,Xiuyang Lu
Metal organic frameworks (MOFs) are promising heterogeneous catalysts for biomass conversion to useful chemicals. In this work, four M-MOF-74s (Co, Ni, Mg, Zn) were synthesized at room temperature. Among these, Mg-MOF-74 exhibited the best catalytic activity for conversion of sugars to methyl lactate. A final product yield of methyl lactate from glucose of 35% was achieved with complete conversion of glucose at optimal reaction conditions. Catalytic performance of conversion of five sugars to methyl lactate over Mg-MOF-74 was studied, a product yield of 47% were obtained from sucrose. Mg-MOF-74 catalyst has shown to be reusable for at least three cycles.
研究领域:
化学工程
·
催化材料科学
✓ 已验证
产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）