Journal of Materials Chemistry A
·
2023
·Vol. 11
·期 42
·22859-22867
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IF 11.9
Jinhong Yang,Haoran Peng,Chong Lin,Qingjiang Pan,Lixue Qi,Li Li,Keying Shi
To overcome the drawbacks of low sensitivity and limited selectivity exhibited by metal oxide sensitive materials, a metal–organic framework (MOF) derived composite (marked as UZZ) was constructed via a combined wet chemical method. UiO-66 was used as the precursor with the introduction of ZnO. The ZrO2 component in UZZ retains the unique octahedral configuration of UiO-66; on its folded surface, a large number of ZnO particles grow, whose sizes range from 20 to 40 nm. The composite exhibits excellent gas sensitivity to NO2 at room temperature. Exemplarily, the gas sensitive response to 100 ppm NO2 is 40.35, with a response time of 1.4 s and a detection limit as low as the 50 ppb level, and the stability is up to 8 weeks. The presence of numerous oxygen vacancies and n–n type heterojunctions on the surface of the UZZ composite synergistically enhances the gas-sensing performance. This finding provides a significant reference for developing new efficient and high-sensitivity metal oxide sensitive materials based on MOFs.
研究领域:
材料科学
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环境科学
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化学工程
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DOI
高影响因子
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
·
2018
·
IF 3.794
Jinshuang Wang,Junbin Sun,Qiangshan Jing,Bing Liu,Hao Zhang,Yu Yongsheng,Jieyan Yuan,Shujuan Dong,Xin Zhou,Xueqiang Cao
The properties of ZrO 2 co-stabilized by CeO 2 and TiO 2 ceramic bulks were investigated for potential thermal barrier coating (TBC) applications. Results showed that the (Ce 0.15 Ti x )Zr 0.85-x O7 (x = 0.05, 0.10, 0.15) compositions with single tetragonal phase were more stable than the traditional 8YSZ at 1573 K. These compositions also showed a large thermal expansion coefficient (TEC) and a high fracture toughness, which were comparable to those of YSZ. However, the phase stability, fracture toughness and sintering resistance of the CeO 2 -TiO 2 -ZrO 2 system showed a decline tendency with the increase of TiO 2 content. The TEC of the ceramic bulks decreased with increase of TiO 2 content as well because the crystal energy was enhanced with increasing substitution of Zr 4+ by smaller Ti 4+ . The (Ce 0.15 Ti 0.05 )Zr 0.8 O 2 had the best comprehensive properties among the (Ce 0.15 Ti x )Zr 0.85-x O 2 compositions as well as a low thermal conductivity . Therefore, it can be explored as a TBC candidate material for high-temperature applications.
研究领域:
材料科学
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热力学工程
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DOI
高影响因子
JOURNAL OF NON-CRYSTALLINE SOLIDS
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2021
·
IF 3.531
Leibo Deng,Zhe Fu,Zhang Mingxing,Hao Li,Bin Yao,Jianli He,Hua Chen,Yonghong Ma
TiO 2 –ZrO 2 -codoped MgO–B 2 O 3 –Al 2 O 3 –SiO 2 glass-ceramics were prepared using the traditional melting method. The effects of replacing TiO 2 with ZrO 2 on the glass stability (GS), crystallization behavior, structures, and properties of the obtained samples were studied. Results showed that the addition of ZrO 2 increased the GS, which decreased the crystallization ability of the samples. When the heat treatment temperature was increased from 900 °C to 1000 °C, the mullite and quartz phases first precipitated in the glass matrix, and then converted into cordierite. Because of the low solubility of TiO 2 and ZrO 2 in this glass system, the rutile and zircon phases will precipitate from the parent glasses. Owing to changes in the composition and structure of the samples, the density and Vickers hardness increased, while the coefficient of thermal expansion of the samples first decreased and then increased when TiO 2 was replaced with ZrO 2 .
研究领域:
材料科学
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无机非金属材料
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DOI
高影响因子
RSC Advances
·
2023
·Vol. 13
·期 23
·15934-15941
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IF 3.9
Xiaoping Chen,Xianfei Wang,Wei Liu,Hui Tian,Yupeng Du,Haisheng Wei,Linsheng Tang
1-Butene, as one of the widely used chemical raw materials, can be produced by the double bond isomerization of 2-butene. However, the current yield of the isomerization reaction is only up to 20% or so. It is therefore an urgent issue to develop novel catalysts with higher performances. In this work, a high-activity ZrO2@C catalyst that is derived from UiO-66(Zr) is fabricated. The catalyst is prepared by calcining the precursor UiO-66(Zr) at high temperature in nitrogen, and characterized by XRD, TG, BET, SEM/TEM, XPS and NH3-TPD. The results demonstrate that the calcination temperature has significant influences on the catalyst structure and performance. Regarding the catalyst ZrO2@C-500, the selectivity and yield of 1-butene are 94.0% and 35.1%, respectively. The high performance is due to multiple aspects, including the inherited octahedral morphology from parent UiO-66(Zr), suitable medium-strong acidic active sites and high surface area. The present work will lead to a better understanding of the ZrO2@C catalyst and guide the rational design of high-activity catalysts for the double bond isomerization of 2-butene to 1-butene.
研究领域:
化学工程
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催化材料科学
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DOI
PubMed
高影响因子
CHEMICAL ENGINEERING SCIENCE
·
2024
·
IF 4.1
Fenghao Shu,Guangcai Long,Yanwu Chen,Ying Gao,Menghao Jiang,Jinxing Long
Conversion of renewable lignin to value-added aromatic chemicals presents a broad prospect to achieve the goals of “carbon neutrality”. In this work, an efficient approach is proposed for selective hydrogenolysis of lignin to valuable 4-propyl syringol in the presence of cost-effective catalyst of y Ni/ZrO 2 - x MoO 3 . When the lignin hydrogenolysis is performed with 15Ni/ZrO 2 -10MoO 3 , 15.4% yield of monophenols is achieved, which is approximately twice as that from the 15Ni/ZrO 2 catalytic system (7.8%). Importantly, 33.1% of these monophenols are identified as 4-propyl syringol (4-PS), a versatile fine chemical. An extensive characterization of the modified catalysts by means of XRD, nitrogen adsorption–desorption isotherm, SEM, TEM, XPS, NH 3 -TPD, CO 2 -TPD, and H 2 -TPR, confirms that the introduction of MoO 3 changes the primary phase of ZrO 2 and the acidity/basicity properties of catalyst. As a result, an enhanced cleavage of the C-O linkage between S-lignin and other units is demonstrated, which consequently contributes to the good selectivity of 4-propyl syringol. Therefore, this work provides a new insight for producing bulk aromatic chemicals via a sustainable route.
研究领域:
化学工程
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可再生资源利用
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DOI
高影响因子
Journal of Materiomics
·
2024
·
IF 8.4
Chengwan Yang,Kewei Li,Mengen Hu,Xinyang Li,Ming Li,Xiaoye Hu,Yue Li,Zhulin Huang,Guowen Meng
Carbon-based materials, renowned for their low density, adjustable electrical conductivity, superior corrosion resistance and mechanical properties, and have found extensive applications in the field of electromagnetic wave absorption (EMWA). Despite their merits, the current EMWA and thermal insulation capabilities are not fully optimized, thereby restricting their applications in the aerospace sector. Herein, we introduce a combinatory methodology employing electrospinning followed by pyrolysis to in-situ integrate ZrO 2 and ZrB 2 nanoparticles onto the surface of carbon nanofibers, culminating in a flexible ZrO 2 /ZrB 2 /C nanofiber felt. The integration of ZrO 2 and ZrB 2 nanoparticles significantly augments impedance matching and promotes multifaceted scattering and interfacial polarization. Consequently, the ZrO 2 /ZrB 2 /C nanofiber felt demonstrates a minimum reflection loss (RL min ) of –54 dB and the effective absorption bandwidth (EAB, RL≤–10 dB) is 3.1 GHz. Moreover, the three-dimensional porous architecture and the presence of multiple heterogeneous interfaces endow the ZrO 2 /ZrB 2 /C nanofiber felt with an ultralow thermal conductivity of 0.016 W⸱m −1 ⸱K −1 at 1100 °C, underscoring its exceptional potential for infrared stealth. This work shows considerable guiding significance for the design of bi-functional EMWA materials with ultralow thermal conductivity in aerospace field.
研究领域:
材料科学
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航空航天工程
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DOI
高影响因子
CERAMICS INTERNATIONAL
·
2025
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IF 5.6
Yongzhi Luo,Bin Wang,Xi Zhang,Bin Kang,Jianguo Deng,Shengquan Yu
Nd:Y 2 O 3 transparent ceramics were fabricated by vacuum pre-sintering and post-hot isostatic pressing with ZrO 2 and MgO as sintering additives. It was found that binary additives not only promoted the densification of Y 2 O 3 ceramics, but also decreased the pre-sintering temperature by at least 150 °C compared with the single addition of ZrO 2 . The best quality sample with 1 at.% ZrO 2 and 0.06 at.% MgO was pre-sintered at 1550 °C and post-HIPed at 1500 °C. The average grain size was approximately 0.96 μm, and the in-line transmittance reached 75.9 % at 400 nm and 81.4 % at 1000 nm. The ceramic also exhibits good optical homogeneity, which is evaluated by the interference stripes with the PV and RMS values of 385.8 nm and 21.3 nm, respectively. Continuous wave laser operation of the sample was demonstrated, and a maximum output power of 1.73 W at 1080.4 nm was achieved with a slope efficiency of 11.3 %.
研究领域:
材料科学
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光学工程
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DOI
高影响因子
JOURNAL OF THE AMERICAN CERAMIC SOCIETY
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2022
·Vol. 106
·期 4
·2702-2715
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IF 4.186
Le Fu,Bohan Wang,Ying Deng,Guofu Xu,Jiwu Huang,Håkan Engqvist,Wei Xia
Liquid-phase sintering (LPS) is an effective pathway to assist the densification of ceramics. However, it has seldom been used to densify glass–ceramics. In the present study, a multielement co-doping strategy has been utilized to achieve LPS of a ZrO 2 –SiO 2 nanocrystalline glass–ceramic. Compared with undoped samples densified by solid-state sintering, doping of equimolar Al, Y, and Ca promoted the densification of the glass–ceramic at lower temperatures with a faster densification rate. Ternary doping enhanced coarsening of ZrO 2 nanocrystallites during sintering and annealing. The distribution of dopants was carefully observed with X-ray energy-dispersive spectrometry technique in scanning electron transmission microscopy mode. Results showed that the three dopants showed different distribution behaviors. After sintering, Y dopants were predominately distributed in ZrO 2 nanocrystallites, whereas parts of Al and Ca dopants were distributed in ZrO 2 nanocrystallites and part of them co-segregated at the ZrO 2 /SiO 2 heterointerfaces. Meanwhile, the segregation of Ca dopant at some intergranular films among ZrO 2 nanocrystallites was observed. Redistribution of dopants did not occur during annealing.
研究领域:
材料科学
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陶瓷工程
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DOI
高影响因子
RSC Advances
·
2015
·Vol. 5
·期 56
·45320-45330
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IF 3.84
Guannan Wang,Limin Chen,Yuhai Sun,Junliang Wu,Mingli Fu,Daiqi Ye
Methanol synthesis from CO2 hydrogenation in a fixed-bed plug flow reactor was investigated over Cu–ZrO2 catalysts supported on CNTs bearing various functional groups. The highest methanol activity (turnover frequency 1.61 × 10−2 s−1, space time yield 84.0 mg gcat−1 h−1) was obtained over the Cu/ZrO2/CNTs catalyst (CZ/CNT-3) with CNTs functionalized by nitrogen-containing groups and Cu loading only about 10.3 wt% under the reaction conditions of 260 °C, 3.0 MPa, V(H2) : V(CO2) : V(N2) = 69 : 23 : 8 and GHSV of 3600 h−1. The catalysts were fully characterized by N2 physisorption, X-ray photoelectron spectroscopy (XPS), X-ray diffraction (XRD), H2-temperature-programmed reduction (H2-TPR) and temperature-programmed desorption of H2 (H2-TPD) techniques. The excellent performance of CZ/CNT-3 is attributed to the presence of nitrogen-containing groups on the CNTs surface, which increase the dispersion of copper oxides, promote their reduction, decreases the crystal size of Cu, and enhances H2 and CO2 adsorption capability, thus leading to good catalytic performance towards methanol synthesis.
研究领域:
化学工程
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催化材料科学
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DOI
高影响因子
JOURNAL OF THE AMERICAN CERAMIC SOCIETY
·
2024
·Vol. 107
·期 9
·6477-6492
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IF 3.5
Le Fu,Wenjun Yu,Zixu Wen,Jinling Liu
Flash sintering has been used to consolidate a wide range of ceramics and ceramic composites. However, flash sintering of ceramic nanocomposite with a substantial amorphous phase is rarely studied. Meanwhile, the effects of yttrium addition on the flash sintering behaviors and microstructures of ZrO 2 -based ceramic nanocomposite remain unknown. Herein, ZrO 2 -SiO 2 crystalline-amorphous ceramic nanocomposites (CACNs) with different contents of amorphous phase and two types of yttrium dopants were sintered by flash sintering. Results showed that the content of amorphous phase (SiO 2 ) had significant effects on the flash sintering behavior. The CACN with 65 mol% SiO 2 was nonflash sinterable due to the high electric resistivity of SiO 2 , whereas, the CACN with 45 mol% SiO 2 can be flash sintered to high densification within 35 seconds. The flash-sintered CACNs consisted of ZrO 2 nanocrystallites distributed in an amorphous SiO 2 matrix. Flash sintering enhanced the tetragonal-to-monoclinic phase transformation of ZrO 2 . In addition, influences of yttrium dopant on CACNs were also investigated. Yttrium dopants can rapidly dissolve in ZrO 2 lattices and show a tetragonal phase stabilization effect during flash sintering. Firework-like ZrO 2 microcrystallites formed by dendritic growth were observed close to the cathode region, which was attributed to athermal electric field effects and the formation and aggregation of oxygen vacancies at the cathode region. The results would provide guidance for fabricating CACNs via flash sintering.
研究领域:
材料科学
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陶瓷工程
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DOI
高影响因子
Desalination and Water Treatment
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2025
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IF 1
Yingying Huang,Jinlong Li,Liming Bai,Xi Chen,Shijie Chen,Huishu Zhang
A magnetically recyclable cauliflower-like yttrium-doped ZrO 2 was successfully prepared via the template method. The phase and morphology of the synthesized sonocatalyst were characterized by XRD, SEM and TEM. The optical properties of the synthesized sonocatalyst were analysed by XPS, DRS and PL. The results showed that when the amount of sonocatalyst Er:YAG/(Fe 3 O 4 @Y-ZrO 2 ) was 1 g/L and the concentration of methylene blue (MB) was 5 mg/L under ultrasonic irradiation for 150 min, the synthesized sonocatalyst showed excellent sonocatalytic activity, and the degradation ratio of MB was up to 91.4 %. In addition, after 5 repeated experiments, Er:YAG/(Fe 3 O 4 @Y-ZrO 2 ) showed similar sonocatalytic activities, indicating that the synthesized sonocatalysts have excellent structural stability and recyclability. Through a comprehensive analysis of experimental results and discussions, this paper elucidates insights into enhancing sonocatalytic degradation efficiency caused by Er:YAG/(Fe 3 O 4 @Y-ZrO 2 ) and proposes potential mechanisms underlying sonocatalytic degradation of MB, thereby contributing to the development of effective strategies for sonocatalytic degradation of organic dye.
研究领域:
材料科学
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环境科学
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产品关联
DOI
高影响因子
MATERIALS CHEMISTRY AND PHYSICS
·
2019
·
IF 2.781
Baosong Li,Weiwei Zhang,Dandan Li,Jiajia Wang
To enhance the performance of nickel-tungsten (Ni W) matrix, Ni W/ZrO 2 CeO 2 nanocrystalline films have been fabricated by electrodeposition in the presence of zirconia (ZrO 2 ) and ceria (CeO 2 ) nanoparticles . The influences of process parameters on microstructural, surface properties and corrosion resistance of the nanocrystalline films were examined. Studies indicated that the fabricated films are dense, homogeneous and without cracks, comprising 23.7–28.7 wt% W, 3.9–4.9 wt% ZrO 2 and 0.45–0.68 wt% CeO 2 . The film prepared at average current density ( I av ) of 6 A dm −2 , duty cycle ( r ) of 70% contains the highest content of ZrO 2 , CeO 2 nanoparticles with the finer structure. The average roughness ( R a ) is 79.1 nm for film formed at 2 A dm −2 . The growth rate of the film is about 0.48–0.53 μm/min at I av = 4 A dm −2 and r = 50%. The hardness first increases and then decreases with the maximum value at r = 70%, I av = 6 A dm −2 and deposition time ( t ) of 40 min, respectively. Energy disperse spectroscopy (EDS) mapping, transmission electron microscope (TEM) and cross-sectional images illustrated that the ZrO 2 and CeO 2 particles had been homogeneously incorporated in the film. The electrochemical measurements illustrate that the optimal corrosion resistance of Ni W/ZrO 2 CeO 2 film could be obtained at r = 70%, I av = 6 A dm −2 and t = 40 min. The incorporation of ZrO 2 CeO 2 in Ni W film would enhance the anti-corrosion properties and hardness. Ni W/ZrO 2 CeO 2 film owns superior hardness and excellent anti-corrosion properties, showing a broad application prospect in harsh environment.
研究领域:
材料科学
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电化学
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表面工程
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DOI
高影响因子
危险品化学品经营许可证（带存储）