APPLIED ORGANOMETALLIC CHEMISTRY
·
2024
·Vol. 38
·期 6
·e7500
·
IF 3.7
Yu Zhang,Pei Wang,Gaiying Han,Zhaoyang Wang,Haitao Yu,Zhenzi Li,Xuepeng Wang,Ying Xie,Wei Zhou
Defects engineering is significant for photocatalytic environment remediation. To this end, visible-light-driven α-Fe 2 O 3 /ZrO 2-x S-scheme heterojunction photocatalysts with optimal oxygen vacancy (O v ) defects are successfully synthesized via a two-step method. Compared with pristine UiO-66-NH 2 -derived ZrO 2-x and α-Fe 2 O 3 , the heterojunction photocatalysts exhibit a wider range of visible light response and higher efficiency in separating photogenerated electron–hole pairs. Among them, the 5% α-Fe 2 O 3 /ZrO 2-x sample shows the best photocatalytic performance to the degradation of tetracycline (TC) (89.3%), in which the pseudo-first-order kinetic rate constants are 8.20 and 16.75 times that of pristine ZrO 2-x and α-Fe 2 O 3 , respectively. The outstanding photocatalytic degradation efficiency can be attributed to both the narrow-bandgap ZrO 2-x with visible light response and the formation of α-Fe 2 O 3 /ZrO 2-x S-scheme heterojunctions. During the formation of heterojunctions, the concentration of oxygen vacancies (O v ) at the interface of α-Fe 2 O 3 /ZrO 2-x decreases monotonically with the increasing loading of α-Fe 2 O 3 , thereby altering the electronic structure of the photocatalyst and forming the heterojunction firmly. In addition, the high stability implies the potential applications in fields of environment.
研究领域:
环境科学
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF MATERIALS SCIENCE & TECHNOLOGY
·
2024
·
IF 11.2
Chao Yang,Chenyu Wang,Zhao Shen,Liping Zhou,Liyuan Sheng,Daokui Xu,Yufeng Zheng,Paul K. Chu,Shu Xiao,Tao Ying,Xiaoqin Zeng
The poor corrosion resistance of magnesium (Mg) and its alloys limits their application in various fields. Micro arc oxidation (MAO) coatings can improve the corrosion resistance, but the pore defects and low surface hardness make them susceptible to wear and accelerated corrosion during usage. In this study, a ZrO 2 nanoparticles doped-MAO coating is prepared on the ZK61 Mg alloy by utilizing an MgF 2 passivation layer to prevent ablation. The ZrO 2 nanoparticles re-melt and precipitate due to local discharging, which produces evenly dispersed nanocrystals in the MAO coating. As a result, the hardness of the MAO coating with the appropriate ZrO 2 concentration increases by over 10 times, while the wear rate decreases and corrosion resistance increases. With increasing ZrO 2 concentrations, the corrosion potentials increase from −1.528 V of the bare ZK61 Mg alloy to −1.184 V, the corrosion current density decreases from 1.065 × 10 –4 A cm –2 to 3.960 × 10 –8 A cm –2 , and the charge transfer resistance increases from 3.41 × 10 2 Ω cm 2 to 6.782 × 10 5 Ω cm 2 . Immersion tests conducted in a salt solution for 28 d reveal minimal corrosion in contrast to severe corrosion on the untreated ZK61 Mg alloy. ZrO 2 nanoparticles improve the corrosion resistance of MAO coatings by sealing pores and secondary strengthening of the corrosion product layer.
研究领域:
材料科学
·
表面工程
✓ 已验证
产品关联
DOI
高影响因子
CERAMICS INTERNATIONAL
·
2022
·
IF 5.532
Ying Mu,Liwen Yan,Peisen Liu,Qichao Gao,Anran Guo,Xiaojing Xu,Haiyan Du,Shun Dong,Jiachen Liu
As a critical structure of thermal protection systems, flexible fibre insulation felts are widely used on the leeward surface of spacecrafts. To enhance the thermal resistance of flexible fibre felts, SiC w -ZrO 2 coatings with different SiC whisker (SiC w ) contents were fabricated on the surface of a high-silica-fibre fabric (HSFF) by employing a sol-gel method combined with a spraying route. The introduction of SiC w having a length of 10–50 μm effectively improved the coating integrity. After calcination at 1000 °C for 1 h, the SiC w -ZrO 2 coating containing 8 wt% SiC w did not damage the tensile strength and flexibility of the fibre fabric, and the interfacial bonding strength between the coating and HSFF reached 0.40 MPa, benefitting from the whisker toughening mechanism. The SiC w -ZrO 2 coating with a high emissivity of 0.96 in the 2–14 μm wavelength range reduced the surface temperature of the flexible insulation felt by approximately 300 °C when a butane torch was applied at above 1300 °C.
研究领域:
材料科学
·
航空航天工程
✓ 已验证
产品关联
DOI
高影响因子
INDUSTRIAL CROPS AND PRODUCTS
·
2019
·
IF 4.191
Gaofeng Chen,Tingzhou Lei,Zhiwei Wang,Shijie Liu,Xiaofeng He,Qian Guan,Xiaofei Xin,Haiyan Xu
A mesoporous composite CoCuK/ZrO 2 -SiO 2 catalyst with high activity and long life was prepared by vacuum impregnation and multisolvent self-assembly. The catalytic activity of the mesoporous catalyst was investigated for the synthesis of ethanol and higher alcohols from biomass syngas from wheat straw. The catalyst was characterized by small-angle X-ray diffraction, power XRD, N 2 adsorption and desorption experiments (BET), and transmission electron microscopy (TEM). The effects on the reaction activity and products from the addition of alkali metal promoter K, the modification of ZrO 2 and different copper/cobalt compositions were analyzed. The life of the catalyst was determined using a pressurized fixed-bed reactor. The results show that the catalyst possesses the high CO hydrogenation activity, high C 2+ OH selectivity and high life expectancy needed to meet industrial applications.
研究领域:
催化化学
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可再生能源
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF RAMAN SPECTROSCOPY
·
2022
·Vol. 53
·期 8
·1386-1393
·
IF 2.727
Tong-Jiang Li,Bao-Ying Wen,Yue-Jiao Zhang,Lin Zhang,Jian-Feng Li
Organophosphorus (OPs) compounds have received enormous attention due to high neurotoxicity. However, the complex detection environment makes it very difficult to detect the OPs compounds at extremely low-concentration. Therefore, it is vital to develop a high sensitive analytical method for the detection of low-concentration OPs compounds at complex environment. Here, we proposed a novel surface-enhanced Raman scattering (SERS) substrate based on the core-shell structure Au@ZrO 2 for the detection of extremely low-concentration OPs compounds. By using above SERS substrate, we tested different kinds of OPs compounds and obtained excellent detection results. The detection limit of methyl parathion and triazophos can reach 0.01 mg/kg. Meanwhile, under the actual system (orange peel), the detection limit of the methyl parathion and triazophos also can reach 0.5 and 0.1 mg/kg, respectively. In addition, the above substrate is also very effective for the detection of dimethyl methylphosphonate (DMMP), a simulant for the chemical warfare agent (sarin), and the detection limit can reach 100 mg/kg. Besides, we also verified the reproducibility and stability of Au@ZrO 2 , which showed excellent properties. The relative standard deviation (RSD) of the SERS signal intensity for 20 tests was 6.38% and the enhancement ability of Au@ZrO 2 can remain stable within 30 days. These results show that the proposed Au@ZrO 2 SERS substrate has great potential in the detection of OPs compounds at extremely low-concentration in the complex detection environment.
研究领域:
分析化学
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环境科学
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材料科学
✓ 已验证
产品关联
DOI
高影响因子
Surfaces and Interfaces
·
2025
·
IF 6.3
Henghao Liu,Guangyao Hou,Hongjun Kang,Xinzhi Wang,Xiaohong Wu,Wei Qin
Thermal control coatings (TCCs) play a crucial role in managing the temperature of spacecraft. However, most of the reported organic TCCs have a relatively high ratio of solar absorptivity to emissivity ( α s / ε ) and their space stability still needs to be improved, which cannot meet the thermal control requirements of future miniaturized and integrated spacecraft. Therefore, it is urgent to develop high-performance organic antistatic TCCs. Herein, hierarchically porous ZrO 2 @AZO-acrylate (ZrO 2 @AZO-ACR) antistatic TCCs were synthesized by combining the atomic layer deposition (ALD) technology and the non-solvent polarity difference induced phase separation method. The developed coating by using water and ethanol mixed solvents exhibits excellent thermal control performance ( α s ∼0.118, α s / ε ∼0.132) and a low volume resistivity (2.5 × 10 6 Ω·m). Both experimental results and FDTD simulations indicate that the presence of a hierarchically porous structure with a wider size distribution and a high content of large-sized micropores enhances the scattering efficiency within the solar spectrum, thereby increasing the solar reflectivity of the ZrO 2 @AZO-ACR coating. Furthermore, the obtained ZrO 2 @AZO-ACR antistatic coating demonstrates strong adhesion to multi-substrate materials and good space stability under electron irradiation, UV irradiation and extreme temperatures. This study provides a novel strategy for preparing high-performance TCCs with good space stability.
研究领域:
材料科学
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航天工程
·
纳米技术
✓ 已验证
产品关联
DOI
高影响因子
METALLURGICAL AND MATERIALS TRANSACTIONS A-PHYSICAL METALLURGY AND MATERIALS SCIENCE
·
2021
·Vol. 52
·期 2
·767-775
·
IF 2.556
Zhu Yabin,Chai Jianlong,Shen Tielong,Wang Zhiguang
Al 2 O 3 -ZrO 2 -TiC composites with different proportions of TiC were prepared by ball milling and spark plasma sintering. Structural characterization revealed that the composites exhibited fine and homogeneous microstructures. No other phases except α-Al 2 O 3 , t-ZrO 2 and c-TiC were detected by XRD in all Al 2 O 3 -ZrO 2 -TiC composites. The internal stress induced by the mismatch of the thermal expansion coefficients result in a shift of t-ZrO 2 diffraction peak. SEM and TEM observations showed that the Al 2 O 3 grain size was inversely proportional to the TiC content, while the grain sizes of ZrO 2 and TiC stayed nearly constant. HRTEM micrograph presented that there are glassy phase boundaries with thickness of several nanometers around the TiC grains. As the TiC content increases, the relative density and hardness decreased from 99.2 to 97.7 pct and from 21.0 to 15.8 GPa, respectively. Compared with Al 2 O 3 -ZrO 2 matrix, composites with TiC exhibited lower flexural strength but enhanced fracture toughness. Composite with TiC of 10 vol pct possessed the best friction property. The increased porosity was mainly responsible for the deterioration of mechanical and friction properties except for the fracture toughness. The improvement in fracture toughness with increasing TiC content was attribute to the crack deflection and pinning effects induced by the TiC particles.
研究领域:
材料科学
·
机械工程
✓ 已验证
产品关联
DOI
高影响因子
CERAMICS INTERNATIONAL
·
2020
·
IF 3.83
Jinjin Ban,Chaojie Zhou,Long Feng,Quanli Jia,Xinhong Liu,Junhua Hu
ZrB 2 -SiCw (w-whisker) composite powders were synthesized by a microwave-assisted carbo/borothermal reduction method under argon atmosphere using zircon , boric acid, and activated carbon as starting materials. The optimized ZrB 2 -SiCw composite powder was obtained by adjusting heating temperature and amounts of boric acid and activated carbon. Further, the effect of the optimized ZrB 2 -SiCw composite powder addition on corrosion resistance of the Al 2 O 3 –ZrO 2 –C slide plate material against O 2 and Ca-treated steel was investigated. The results showed that the relative content of ZrB 2 -SiCw increased with increasing temperature. The excess of boric acid favored the formation of the ZrB 2 -SiCw, and the optimum amount of boric acid was overdosed to 30–45 wt%. The corrosion resistance and thermo-mechanical properties of Al 2 O 3 –ZrO 2 –C slide plate material could be improved effectively with 6 wt% ZrB 2 -SiCw composite powder addition, which was attributed to the excellent oxidation and corrosion resistance of ZrB 2 -SiCw composite powder. In addition, ZrB 2 -SiCw could confer excellent thermal shock resistance and reduce the generation of cracks, ultimately preventing corrosive media from infiltrating into slide plates, further increasing corrosion resistance of the plates.
研究领域:
材料科学
·
冶金工程
✓ 已验证
产品关联
DOI
高影响因子
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
·
2024
·
IF 4.9
Yueming Wang,Yong Men,Lini Liao,Lijie Fu,Zaiwei Lu,Shuyi Xu,Jinguo Wang,Zhenrong Yan,Xuelong Miao
The ZnO/ZrO 2 binary catalyst system has been an emerging and promising catalyst for efficient production of H 2 through methanol steam reforming (MSR). Herein, ZrO 2 supports with different crystalline phases were prepared by the oxygen vacancy engineering strategy of Li doping, and then ZnO/ZrO 2 catalysts were prepared by the isovolumic impregnation method. The different quantities of doped Li have been found to have a significant impact on dominant crystal phase of ZrO 2 supports, which dictates the interaction between ZnO and ZrO 2 and the number of oxygen vacancies. In comparison with ZnO/ZrO 2 -20Li and ZnO/ZrO 2 -40Li catalysts with predominate tetragonal and monoclinic crystal phase, ZnO/ZrO 2 -3Li with a mixed crystalline phase exhibits higher catalytic activity for methanol conversion ( X CH 3 OH ) and CO selectivity (S CO ). Complete methanol conversion of the best performing ZnO/ZrO 2 -3Li catalyst was observed at a very low CO selectivity of 3.1 % at 375 ℃. The XRD, UV, and XPS characterization results indicate that the strong interaction between ZrO 2 and ZnO leads to the appearance of large amount of oxygen vacancies at the ZnO/ZrO 2 interface, which greatly improves the performance of the catalyst. ZnO/ZrO 2 catalyst showed remarkable stability without obvious deactivation after 32 hours of continuous testing. This work highlights the effectiveness of oxygen vacancy engineering of the ZnO/ZrO 2 catalysts for applications in methanol steam reforming and other heterogeneous catalytic systems.
研究领域:
化学工程
·
催化科学
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
·
2013
·
IF 3.548
Ben Ma,Bo Chi,Jian Pu,Li Jian
NiO–Y 2 O 3 stabilized ZrO 2 (YSZ) composite is the state-of-the-art material for the anode support of planar solid oxide fuel cells (SOFCs). To improve its fracture toughness ( K C ), lanthanum orthoniobate LaNbO 4 is synthesized by the method of solid state reaction and added to the mixture of YSZ and NiO at the weight ratio of 47:53. The content of LaNbO 4 in the composite is in the range between 5 and 30 wt%. The microstructure of the composites is examined by scanning electron microscopy (SEM); and the chemical compatibility among the components is evaluated by X-ray diffraction (XRD) and energy dispersive X-ray spectroscopy (EDS). Vickers hardness test is performed for estimating the K C of the composites. The results indicate that the K C increases with the addition of LaNbO 4 in the composites; and the toughening effect is associated with the grain-refinement in the composite and the domain switch in the monoclinic LaNbO 4 .
研究领域:
材料科学
·
能源工程
✓ 已验证
产品关联
DOI
高影响因子
Chemistry-An Asian Journal
·
2018
·Vol. 14
·期 3
·416-421
·
IF 3.692
Qian Wang,Wei Sun,Tianying Xie,Limei Cao,Ji Yang
Graphical Carbon-coated catalysts : Octahedral Pt/ZrO 2 @C, prepared by direct carbonization of the precursor UiO-66-NH 2 (a zirconium-based metal–organic framework), exhibits improved catalytic activity for selective catalytic reduction with H 2 at ambient temperature, compared with that of other platinum-based catalysts with porous materials as supports (see figure). Selective catalytic reduction (SCR) of NO x with H 2 as a reductant is the most promising denitration technology at low temperature. Achieving the conversion of NO x into N 2 at ambient temperature not only prolongs the service life of the catalyst, but also provides more freedom for the arrangement of denitration units throughout the flue gas treatment equipment. However, the development of highly efficient, stable, and environmentally benign supported platinum-based catalysts for H 2 -SCR at ambient temperature is still a major challenge. Herein, a 0.5 wt % Pt/ZrO 2 @C catalyst, which was composed of carbon-coated octahedral ZrO 2 with highly dispersed Pt particles, was prepared by using a new stabilization strategy based on UiO-66-NH 2 (a zirconium metal–organic framework) as a template. The catalytic performance of this Pt/ZrO 2 @C in H 2 -SCR was tested and confirmed to achieve near 100 % NO x conversion at 90 °C. Also, 70 % N 2 selectivity of the catalyst was achieved. The morphology, structure, and porous properties of the as-synthesized nanocomposites were characterized by using data obtained from field-emission SEM, TEM, XRD, Raman spectroscopy, thermogravimetric analysis, X-ray photoelectron spectroscopy, and N 2 adsorption–desorption isotherms. The results show that residual carbon formed by pyrolysis treatment is coated on octahedral ZrO 2 , and effectively prevents the agglomeration of platinum particles on the surface.
研究领域:
化学工程
·
材料科学
·
环境科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
FUEL
·
2018
·
IF 4.908
Zihao Zhang,Hao Chen,Changxue Wang,Kequan Chen,Xiuyang Lu,Pingkai Ouyang,Jie Fu
In this work, a series of ZrO 2 -supported Cu, Ni and bimetallic Cu-Ni catalysts were synthesized and evaluated for their activity and stability in the in situ hydrogenation and decarboxylation of oleic acid using methanol as a hydrogen donor. High-angle annular dark-field scanning transmission electron microscopy (HADDF-STEM), energy dispersive X-ray spectroscopy (EDS-mapping), X-ray diffraction (XRD) and temperature programmed reduction (TPR) characterizations revealed that the as-synthesized Cu-Ni/ZrO 2 was a Cu-Ni alloy that was highly dispersed on mixed m-ZrO 2 and t-ZrO 2 . The bimetallic Cu-Ni/ZrO 2 nanostructures not only exhibited better catalytic activity for the conversion of oleic acid compared to monometallic Cu/ZrO 2 and Ni/ZrO 2 catalysts but also demonstrated good reuse performance. The formation of the Cu-Ni alloy facilitated the decarboxylation reaction and inhibited the cracking reaction, leading to enhanced catalytic performance. The good stability of Cu-Ni/ZrO 2 was primarily due to the good hydrothermal stability of the ZrO 2 support.
研究领域:
化学工程
·
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）