JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
·
2023
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IF 5.7
Yuxuan Liao,Yifei Dai,Yifan Zhai,Aoping He,Huan He,Tianquan Liang
The effect of Sc 2 O 3 content on the corrosion behaviors of x Sc 2 O 3 -3.5Y 2 O 3 co-doped ZrO 2 (ScYSZ, x = 4.5, 5.5 and 6.5 mol.%) in calcium-magnesium-alumino-silicate (CMAS) at 1300 °C was investigated in this paper. It is shown that the ScYSZ ceramic exhibits better resistance to molten CMAS attack when doping with more Sc 2 O 3 . The CMAS penetration depth in the ScYSZ ceramic decreases with increasing Sc 2 O 3 . It is about 18 µm of CMAS penetrated depth in the 6.5Sc3.5YSZ after corrosion for 4 h at 1300 °C, including an 11 µm and 7 µm for the reaction-reprecipitation and grain-boundary infiltration layers, respectively. High thermochemical stability and weak reactivity of the ScYSZ to the glassy CMAS melt are beneficial to enhance the high temperature corrosion resistance, attributing to the low solubility in molten CMAS and the weak affinity to Ca 2+ for small ionic radius Sc 3+ . The mechanism of enhancing the resistance to CMAS is discussed.
研究领域:
材料科学
·
腐蚀科学
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DOI
高影响因子
Materials
·
2023
·Vol. 16
·期 17
·5984
·
IF 3.4
Zhi Li,Chengwei Zhan,Huan Yu,Xitao Wang,Shouqiu Tang,Jixue Zhou,Jianhua Wu
Research on rare-earth fluorides is of urgent and critical importance for the preparation and emerging applications of high-purity alloys. The fluorination of Sc2O3by NH4HF2to fabricate ScF3is investigated. The effects of the fluorination temperature, time and mass ratio of reactant on the fluorination rate and fluoride are discussed in this work. The fluorination reaction was first confirmed using thermodynamic calculation. The thermal and mass stability of the fluorination process were analyzed by thermogravimetric and differential scanning calorimetric (TG-DSC). The as-obtained products at different fluorination temperatures were characterized by Powder X-ray diffraction (PXRD), scanning electron microscopy (SEM) and high-resolution transmission electron microscopy (HRTEM). The results indicated that the fluorination began at room temperature (RT) with the formation of (NH4)3ScF6. With the increase of temperature, the reaction proceeded sequentially through the formation of NH4ScF4, (NH4)2Sc3F11, and finally ScF3. The fluorination rate increased with the increase of fluorination temperature and holding time. ScF3with a purity of 99.997 wt.% could be obtained by fluorination at 400 °C for 2 h.Keywords:Sc2O3;(NH4)3ScF6;NH4ScF4;(NH4)2Sc3F11;ScF3
研究领域:
材料科学
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化学工程
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产品关联
DOI
PubMed
高影响因子
Crystals
·
2025
·Vol. 15
·期 2
·198
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IF 2.4
Zupeng Mo,Zijian Mo,Zhiyun Yu,Yifan Cheng,Yiling Miao,Tianquan Liang
The thermochemical interactions of Sc2O3ceramics with CMAS at 1250 °C and 1300 °C were investigated in this paper. A continuously dense reaction layer (DRL) forms on the surface of the ceramic at the beginning of the reaction within 15 min, and temperature significantly affects the components of the DRL. The DRL is mainly composed of a diopside phase at 1250 °C, whose thickness decreases with reaction time, while it is composed of garnet and minor diopside phases at 1300 °C, and thickens in accordance with the parabolic law with exposure time. The DRL shows good effect on alleviating Mg2+infiltration and some mitigating effect to Al3+, and relatively inferior resistance to Ca2+and Si4+penetration. The concentration of Sc3+in the residual CMAS increases with reaction temperature and time, and the average contents are about 0.7 at% and 3.7 at% after reactions at 1250 °C and 1300 °C, respectively. The mechanism is discussed systematically.
研究领域:
材料科学
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化学
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DOI
高影响因子
Energy Material Advances
·
2023
·
IF 12.9
Haixiang Huang,Jinting Chen,Tingting Xu,Yujie Lv,Bogu Liu,Bao Zhang,Jianguang Yuan,Ying Wu
Complex metal oxide catalysts greatly accelerate the hydrogen sorption rates in the magnesium hydride system. In this study, the graphene-supported Sc2O3/TiO2 catalyst is synthesized by means of a simple method, and a surprisingly synergetic effect of the Sc2O3-TiO2 cocatalyst on the hydrogen storage performance of MgH2 is observed. The MgH2-Sc2O3/TiO2@Gn composite starts to release hydrogen at 140 °C and reaches the peak dehydrogenation temperature at 239.9 °C. It absorbs 6.55 wt% of H2 in 1 min and desorbs 5.71 wt% of H2 in 10 min at 300 °C, showing excellent hydrogen absorption and desorption performance. Furthermore, with the decrease of the grain size and changes in the structure, the activity of the catalyst is greatly improved. The low-valent titanium and scandium and oxygen vacancies formed in the process of dehydrogenation facilitate hydrogen diffusion and electron transfer, and further improve the kinetic performance of the Mg/MgH2-Sc2O3/TiO2@Gn system. This study aims to provide insights into studying complex metal oxides as catalysts to improve hydrogen storage performance, and shed light on other catalysis-related research.
研究领域:
材料科学
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催化化学
✓ 已验证
DOI
高影响因子
INTERNATIONAL JOURNAL OF MOLECULAR SCIENCES
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2023
·Vol. 24
·期 8
·7649
·
IF 5.6
Yanjing Liu,Xiyue Li,Yuezhou Liu,Yaping Huang,Fuming Wang,Yongfang Qian,Ying Wang
Due to their high porosity, large specific surface area, and structural similarity with the extracellular matrix (ECM), electrospun nanofiber membranes are often endowed with the antibacterial properties for biomedical applications. The purpose of this study was to synthesize nano-structured Sc2O3-MgO by doping Sc3+, calcining at 600 °C, and then loading it onto the PCL/PVP substrates with electrospinning technology with the aim of developing new efficient antibacterial nanofiber membranes for tissue engineering. A scanning electron microscope (SEM) and energy dispersive X-ray spectrometer (EDS) were used to study the morphology of all formulations and analyze the types and contents of the elements, and an X-ray diffraction (XRD), thermogravimetric analysis (TGA), and Fourier transform attenuated total reflection infrared spectroscopy (ATR-FTIR) were used for further analysis. The experimental results showed that the PCL/PVP (SMCV-2.0) nanofibers loaded with 2.0 wt% Sc2O3-MgO were smooth and homogeneous with an average diameter of 252.6 nm; the antibacterial test indicated that a low load concentration of 2.0 wt% Sc2O3-MgO in PCL/PVP (SMCV-2.0) showed a 100% antibacterial rate againstEscherichia coli(E. coli).Keywords:nano-textured;Sc2O3-MgO;antibacterial;electrospinning
研究领域:
生物医学工程
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材料科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
FUEL
·
2018
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IF 4.908
Yun-Chuan Pu,Shui-Rong Li,Shuai Yan,Xiao Huang,Duo Wang,Yue-Yuan Ye,Yun-Quan Liu
Copper sintering at temperatures above 200 °C has been a big challenge for the application of copper-based catalysts in methanol reforming for hydrogen production. In the present work, a Cu/ZnO catalyst promoted by Sc 2 O 3 was developed, which is capable of converting methanol into hydrogen-rich gas with good activity and decent stability in the temperature range of 220–600 °C. The role of Sc in Cu/Sc 2 O 3 -ZnO catalysts was explored through the XRD, H 2 -TPR, N 2 O chemisorption, TEM, Raman, and XPS analyses. The results indicated that ZnO lattice was doped with the Sc 3+ ion, which led to increased metal dispersion, strengthened interaction between Cu metal and support oxide, and subsequently enhanced catalytic activity and stability of the Cu/Sc 2 O 3 -ZnO catalyst in methanol reforming for hydrogen production.
研究领域:
化学工程
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催化材料科学
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产品关联
DOI
高影响因子
CERAMICS INTERNATIONAL
·
2020
·
IF 3.83
Xiaodong Wei,Guoliang Hou,Yulong An,Pan Yang,Xiaoqin Zhao,Huidi Zhou,Jianmin Chen
6-8 wt% yttria-stabilized zirconia (YSZ) has been widely employed as thermal barrier coating (TBC) to protect the high-temperature components of aero-engine and gas-turbine. However, the phase transition and sintering densification at high temperature seriously limit its application above 1200 °C. On account of this, CeO 2 and Sc 2 O 3 were doped into the YSZ by solid-state reaction sintering method in this paper. The effects of doping on the crystal structure, phase transition behavior and sintering resistance were investigated on the basis of XRD, Raman and FESEM , and the evolution of thermal properties of the ceramics was also analyzed. The results indicated that doped CeO 2 increases the cell volume and tetragonal degree, but doped Sc 2 O 3 was opposite. Co-doping caused not only significant difference in atomic mass and radius but also the formation of a large number of oxygen vacancies in the ceramics. Therefore, CeScYSZ showed the lowest thermal conductivity (1.53 W‧m −1 ‧K −1 ), which was about 23% lower than that of YSZ (2.00 W‧m −1 ‧K −1 ). More importantly, the oxygen vacancy also effectively stabilized the octet lattice, while the increase of lattice energy caused by Sc-O bond made it difficult for ions to misplace, which finally well prevented the transformation from t phase to m phase. There was no detrimental m -ZrO 2 phase formation in the CeScYSZ after 120 h at 1500 °C. Besides, Co-doping could simultaneously overcome the poor sintering resistance caused by single CeO 2 doping and the lower thermal expansion coefficient caused by single Sc 2 O 3 doping, thus the CeScYSZ should be an ideal long-acting thermal protection material at higher temperatures.
研究领域:
材料科学
·
高温材料
·
陶瓷材料
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DOI
高影响因子
SOLID STATE IONICS
·
2016
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IF 2.38
Jiang Tan,Yuchang Su,Te Hu,Qiushan Yu,Rabigul Tursun,Quan Li,Yunze Xi
The cubic 10Sc1CeSZ (10 mol% Sc 2 O 3 –1 mol% CeO 2 –89 mol% ZrO 2 ) was prepared by controlling the concentration of the urea varied from 0.4 to 0.6 mol/L in the hydrothermal process. XRD results depict that the 10Sc1CeSZ blocks have a stable cubic phase structure at room temperature after sintering at 1150–1450 °C. SEM characterization of the fracture surface of the 10Sc1CeSZ blocks shows that the grain size increases from 0.3 to 8 μm during heat treatment up to 1150–1450 °C, correspondingly, the relative densities increase from 98.3% to 99.7%. The impedance spectra measured at 300 °C reveal that the grain boundary resistance reduces with the increase of sintering temperature . Impedance analysis results show that the 10Sc1CeSZ block sintered at 1450 °C for 4 h has the highest total ionic conductivity of 0.137 S cm − 1 at 800 °C.
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DOI
高影响因子
Journal of Energy Chemistry
·
2020
·
IF 7.216
Miao Zhou,Shan Guo,Guozhao Fang,Hemeng Sun,Xinxin Cao,Jiang Zhou,Anqiang Pan,Shuquan Liang
The development of promising zinc anodes mainly suffers from their low plating/stripping coulombic efficiencies when using aqueous electrolyte, which are mainly associated with the interfacial formation of irreversible by-products. It is urgent to develop technologies that can solve this issue fundamentally. Herein, we report an artificial Sc 2 O 3 protective film to construct a new class of interface for Zn anode. The density functional theory simulation and experimental results have proven that the interfacial side reaction was inhibited via a stratified adsorption effect between this artificial layer and Zn anode. Benefiting from this novel structure, the Sc 2 O 3 -coated Zn anode can run for more than 100 cycles without short circuit and exhibit low voltage hysteresis, and the coulombic efficiency increases by 1.2%. Importantly, it shows a good application prospect when matched with two of popular manganese-based and vanadium-based cathodes. The excellent electrochemical performance of the Sc 2 O 3 -coated Zn anode highlights the importance of rational design of anode materials and demonstrates a good way for developing high-performance Zn anodes with long lifespan and high efficiency.
研究领域:
电化学
·
材料科学
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产品关联
DOI
高影响因子
JOM
·
2024
·Vol. 76
·期 8
·3994-4005
·
IF 2.1
Li Weishun,Yun Hong,Dai Wenjing,Wang Baofeng,Xu Qunjie
Phosphoric acid etching combined with hydrothermal treatment was used to construct a Sc 2 O 3 -ZnO coating on the Zn anode surface to tune the content of Zn (002) crystal surface. The (002) crystalline surface of Zn surface became the preferred crystal face for the H 3 PO 4 etching time of 7 min and hydrothermal reaction for 2 h at 160°C. The polarization curve results showed that in 2 M of ZnSO 4 solution, the corrosion potential of Zn anode with (002) crystallographically optimal orientation was positively shifted by 663 mV and the corrosion current density was reduced by about four orders of magnitude compared with the bare Zn. The results of LSV and XRD showed that the Zn anode with (002) preferred crystal face possessed a more negative hydrogen evolution potential, which effectively hindered the occurrence of the H 2 evolution side reaction and significantly inhibited the corrosion of metal Zn and the generation of alkaline zinc sulfate hydrate as a byproduct. Dense Sc 2 O 3 -ZnO coatings composed of crosslinked nanofibers provided a long-lasting and effective shielding protection. The coating facilitated the induction of Zn (002) crystal face oriented deposition, and the bonding of N or P enhanced the stability of coating, which significantly enhanced the corrosion resistance.
研究领域:
材料科学
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电化学
✓ 已验证
产品关联
DOI
高影响因子
OPTICAL MATERIALS
·
2021
·
IF 3.08
Huilian Qin,Jing Li,Meijuan Yuan,Yaru Peng,Yuxin Huang,Li Chen
Monodisperse sub-10 nm Sc 2 O 3 : Yb, Er upconverting nanoparticles (UCNPs) were firstly synthesized via solvothermal method in three-neck round-bottom flask. The X-ray diffraction (XRD) shows that the prepared UCNPs possess cubic structure. The transmission electron microscopy (TEM) shows that sample has monodisperse spheroid morphology with high crystallinity . The average size of spheroid UCNPs could be controllable manipulated as small as 3 nm. Furthermore, the sample exhibits stronger red and green upconversion luminescence (UCL) than reported Sc 2 O 3 : Yb, Er nanostructure by biphasic solvothermal method. The Fourier-transform infrared (FTIR) spectra and decay curve reveal that ultra-small Sc 2 O 3 : Yb, Er UCNPs exhibit the reduced surface groups and long decay time of Er 3+ ions. The results indicate Sc 2 O 3 : Yb, Er UCNPs is a probable oxide material with small size and intense UCL for biological applications.
研究领域:
材料科学
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光学
·
生物医学工程
✓ 已验证
产品关联
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2022
·
IF 16.744
Minglu Sun,Peng Zhou,Jiali Peng,Chuanshu He,Ye Du,Zhicheng Pan,Shijun Su,Fan Dong,Yang Liu,Bo Lai
Generation of reactive radicals via photocatalytic peroxymonosulfate (PMS) is restricted by the sluggish kinetics of PMS decomposition and lack of electron transfer channel. Herein, we firstly prepared rare earth oxide functionalized carbon nitride (5-ScO-CN) by simple in-situ one-step calcination method, and surprisingly found it mediated photoexcited electron transfer between PMS and organic contaminants to boost PMS based oxidation decontamination. Rare earth oxide proceeds as active sites to mediate electron transfer from organic contaminants and PMS under visible light irradiation, it concurrently elevates fast oxidation of organic contaminant and activation of PMS to produce reactive radicals to further oxidize organic contaminants. We conducted density functional theory (DFT) calculation and galvanic oxidation process (GOP) to further unveil the role of 5-ScO-CN for mediating photoexcited electron transfer and generation of reactive radicals. This work proposes a novel mechanism for visible light boosted PMS based oxidation and provides a novel strategy for application of photocatalytic oxidation in environmental remediation field.
研究领域:
环境科学
·
光催化
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）