INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
·
2018
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IF 3.141
Xianghong Li,Lei Li,Xiang Ren,Dan Wu,Yong Zhang,Hongmin Ma,Xu Sun,Bin Du,Qin Wei,Baihai Li
NH3 synthesis consumes 1% of the world’s energy, making it a substantial contribution to greenhouse gas emissions. Electrochemical artificial N2 fixation provides a green and sustainable route over the traditional Haber–Bosch process to enable sustainable NH3 synthesis at ambient conditions while requiring catalysts for the N2 reduction reaction (NRR). Here, we first demonstrate that the Y2O3 nanosheet serves as a high-efficiency nonprecious metal NRR catalyst. When tested at neutral pH, such Y2O3 nanosheet attains a large NH3 yield of 1.06 × 10–10 mol s–1 cm–2 and a high Faradaic efficiency of 2.53% at −0.9 V vs reversible hydrogen electrode with excellent stability and durability. Density functional theory calculations reveal that addition of the first H atom is the potential crucial step, the following hydrogenation steps are feasible, and it is easy to release NH3 molecules.
研究领域:
化学
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材料科学
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环境科学
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高影响因子
INTERNATIONAL JOURNAL OF REFRACTORY METALS & HARD MATERIALS
·
2023
·
IF 3.6
Weili Wang,Jinfang Wang,Meng Zhang,Huilin Lan,Shengyang Zhao,Changyu Liang,Feilong Xu,Ling Shao,Dongdong Zhu,Sheng Dai,Yuyuan Yao,Liu Zhu
The mechanical properties and corrosion resistance of binderless tungsten carbide largely determine its performance and lifespan in complex industrial environments. Herein, WC-1Y 2 O 3 -xSiC w (x = 0, 0.5, 1, and 2 wt%) was prepared using the hot-press sintering. The mechanical properties of the composite, as well as the corrosion resistance of optimized mechanical properties in an aggressive medium (0.05 M H 2 SO 4 and 1 M NaOH) were investigated. Results showed that SiC w could significantly increase mechanical properties of the composite, but excessive content (2 wt%) leads to whiskers aggregation and lower properties. The flexural strength and fracture toughness are all increased to varying degrees with whisker content. WC-1Y 2 O 3 -0.5SiC w possesses the optimal mechanical properties. The Vickers hardness , fracture toughness, and flexural strength are 2331.24 HV 30 , 8.59 MPa·m 1/2 , and 1727 MPa, respectively. Electrochemical tests show that the corrosion resistance of the WC-1Y 2 O 3 -0.5SiC w in H 2 SO 4 is higher than that in NaOH solution, and its corrosion resistance in H 2 SO 4 solution increases, but that of the NaOH solution decreases with exposure time. Detailed characterization demonstrated that a dense WO 3 film forms in the H 2 SO 4 solution, resulting in a flatter corrosion surface. In contrast, the WC phase in NaOH solution dissolves, thus leading to the accelerated corrosion rate.
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JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
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2019
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IF 4.029
Zhaoyubo Zeng,Yunzhong Liu,Feng Qian,Jianxiu Guo,Min Wu
Yttria , yttria-ceria and yttria-ceria-lanthana stabilized zirconia powders were prepared by coprecipitation . Their tetragonal-to-monoclinic phase (t→m) transformation was investigated by calcining the powders in a temperature range of 400–1400 °C for 2 h. The results show that after doping with 0.1 to 0.3 mol.% La 2 O 3 and calcining at 1400 °C in air, unusual redox behaviours of cerium were detected in the 1.5 mol.% Y 2 O 3 +5.5 mol.% CeO 2 co-stabilized zirconia. Grain refinement and a sharp reduction in oxygen vacancy concentration were observed simultaneously. The t→m transition was not found in the 0.1 mol.% La 2 O 3 doped zirconia but appeared in the cases with a higher dopant content. The changes are discussed with regards to the grain size, valence change of cerium, presence of oxygen vacancies, and segregation of the dopants at grain boundaries.
研究领域:
材料科学
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无机化学
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DOI
高影响因子
JOURNAL OF CHEMICAL TECHNOLOGY AND BIOTECHNOLOGY
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2026
·
IF 2.7
Zhe Dong,Wei Xue,Jianhua Lv,Daolai Sun
BACKGROUND 3-Hydroxybutanal (3-HBA) is an important chemical product with a wide range of applications. This study investigated the liquid-phase condensation of acetaldehyde to produce 3-HBA over MgO-based catalysts, such as MgO–Y 2 O 3 , MgO–La 2 O 3 , and MgO–Al 2 O 3 . The influence of the Mg/Y ratio on the catalyst performance was thoroughly investigated, and the effects of the reaction conditions on the formation of 3-HBA were also studied. Furthermore, the relationship between the catalyst properties and the catalytic activity was investigated. RESULTS The MgO–Y 2 O 3 catalyst showed a high catalytic performance for the production of 3-HBA, and the optimal Mg/Y molar ratio was 1:1. The MgO–Y 2 O 3 catalyst with a molar ratio of 1:1 exhibited both weak acidic and weak basic properties, and its acid and base amounts were lower than those of MgO. Reaction temperature significantly affected the reaction, and increasing the temperature was detrimental to the formation of 3-HBA. In the reaction conducted using the MgO–Y 2 O 3 catalyst at 45 °C for 2.5 h, the conversion of acetaldehyde achieved was 52.5% with a 3-HBA selectivity of 82.4%. CONCLUSION The MgO–Y 2 O 3 catalyst with appropriate acid–base properties effectively promotes the formation of 3-HBA. An insufficient or excessive number of acidic or basic active sites is detrimental to 3-HBA yield. It is proposed that the acidic sites activate the CO bond via an electron-withdrawing effect, while the basic sites facilitate α -H elimination to generate a delocalized reactive intermediate. This intermediate subsequently undergoes nucleophilic addition to form 3-HBA. © 2026 Society of Chemical Industry (SCI).
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CHINESE JOURNAL OF CATALYSIS
·
2026
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IF 17.2
Haifeng Fan,Di Xu,Ting Zeng,Guoqiang Hou,Yangyang Li,Siyi Huang,Yanfei Xu,Zheng Wang,Xinhua Gao,Xiang-Kui Gu,Mingyue Ding
CO 2 methanation technology has shown great application prospects in carbon neutrality and hydrogen storage due to its extremely high energy efficiency and potential economic benefits. It is highly desirable but challenging to design novel catalyst and achieve efficient and stable CO 2 methanation under mild conditions. Herein, we developed a highly active electron-enriched Y 2 O 3 /Ni catalyst, achieving a stable operation with ~80.1% CO 2 conversion and ~100% CH 4 selectivity for 400 h at 0.1 MPa and 220 °C, which was a 100 °C lower than the conventional supported Ni-based catalysts. Structural characterizations confirmed that the Y 2 O 3 /Ni catalyst maintained dynamic redox changes and formed electron-enriched Y 2 O 3– x -Ni interfaces under reaction conditions. Mechanism studies proved that the Y 2 O 3– x -Ni interfaces obviously lowered the energy barrier of *HCO dissociation, and shifted the rate-determining step from *HCO dissociation to *CO hydrogenation. Furthermore, profited by the moderate CO x adsorption ability and higher H 2 coverage at the Y 2 O 3– x -Ni interfaces, the *CO hydrogenation reaction was kinetically promoted. The above factors accounted for the excellent low-temperature CO 2 methanation activity of the Y 2 O 3 /Ni catalyst.
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CERAMICS INTERNATIONAL
·
2025
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IF 5.6
Kai Li,Ming Qiang,Jia Tong,Kaichen Qian,Yanna Tian,Bingheng Sun,Long Zhang,Wei Wu,Jintai Fan,Xiaomeng Yin
In this study, Al 2 O 3 -doped Y 2 O 3 -MgO nanocomposite ceramics were synthesized to inhibit abnormal grain growth. Y 2 O 3 -MgO nanopowders were synthesized using a sol-gel combustion approach. Two distinct Al 2 O 3 doping methods were employed: aluminum nitrate doping during the solution preparation stage and aluminum isopropoxide doping during the ball-milling stage of powder preparation processing. This study presents a comparative analysis of the effect of two doping methods on the performance and microstructure of ceramics. Doping during the solution preparation process can provide a more homogeneous distribution of Al 2 O 3 , which facilitated the formation of a minor Y 4 Al 2 O 9 phase. This tertiary phase effectively inhibited abnormal grain growth and improved mid-infrared transmittance. However, Al-O bonds cause a blue shift of transmission cut-off edge and an increase of emissivity, though the practical consequences for device performance require further investigation.
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ACS Catalysis
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2025
·
IF 13.1
Jilei Lin,Meiqing Shen,Sifeng Bi,Gurong Shen,Feng Gao,Wei Li
Propylene production via propane dehydrogenation (PDH) over supported platinum (Pt) catalysts is a vital industrial process. However, rapid catalyst deactivation due to coking necessitates periodic regeneration under harsh oxidative conditions. While alloying Pt with transition metals significantly reduces coking, these alloy catalysts often exhibit poor regeneration stability. In this study, we demonstrate that supporting PtIn nanoparticles on Y2O3-modified δ-Al2O3 yields a PDH catalyst with significantly improved activity and stability. This catalyst achieves propane conversion rates close to the thermodynamic equilibrium at an ultralow Pt loading of 0.1 wt %, along with high propylene selectivity. Notably, this catalyst also exhibits remarkable regeneration stability. Through reaction-regeneration cycling experiments with various catalyst formulations, we reveal that the alloy effects between Pt and In are primarily responsible for enhanced catalyst stability under steady-state reaction conditions by suppressing coke formation. Meanwhile, the incorporation of Y2O3 as a support component significantly improves stability during regeneration. Density functional theory (DFT) calculations further elucidate the key factors contributing to the enhanced anticoking properties of the catalyst under PDH reaction conditions.
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高影响因子
PHYSICA B-CONDENSED MATTER
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2024
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IF 2.8
Yong Tang,Qiuyue Ran
This paper synthesized Y 2 O 3 : Yb 3+ /Er 3+ /Tm 3+ fluorescent crystals (YET) by annealing using the laser zone melting method. When the 365 nm(UV) and 980 nm(IR) lasers are excited together, the luminescence color of YET can be changed by adjusting the laser power. It can be adjusted between orange-red, yellow-green, and white. The temperature sensing characteristics based on the fluorescence intensity ratio (FIR) of non-thermally coupled levels (NTCL) and thermally coupled levels (TCL) of Tm 3+ and Er 3+ ions were studied. The derived maximum relative sensitivity ( S R ) reached the impressive value of 10.871 K -1 (303 K) and 0.511 %K −1 (563K), respectively. Moreover, as the temperature increases, the luminescence of the YET emission changes from white to blue. So, the luminescence emitted by YET can be adjusted between red, green, blue, and white. Therefore, using dual lasers to excite fluorescent materials can provide a suitable method for color-adjustable phosphor.
研究领域:
材料科学
·
光学
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DOI
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
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2017
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IF 3.133
Dandan Feng,Zhihong Li,Yumei Zhu,Huanli Ji
In this study, effects of rare earth oxide CeO 2 and Y 2 O 3 on the structure and properties of glass-diamond composites were systematically researched. The thermal analysis of the borosilicate glass was performed by TG-DSC curves. Phase composition of the glass-diamond composites was analyzed by XRD . SEM images showed the microstructure of the composites. Thermal properties of the composites were characterized by thermal conductivity and coefficient of thermal expansion . Bending strength was measured to explain the mechanical properties. Results showed that the addition of CeO 2 and Y 2 O 3 improved the mechanical and thermal properties of the glass-diamond composites and CeO 2 /Y 2 O 3 compound additive had greater impacts on the composites than single additive. When the content of CeO 2 /Y 2 O 3 additive reached 4 wt % (1.07 vol %), the thermal conductivity and bending strength of the glass-diamond composites increased by 69.77% and 35.13%, respectively.
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高影响因子
CORROSION SCIENCE
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2022
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IF 7.72
Tianquan Liang,Zhihua Huang,Menghao Li,Wantong Xiao,Huan He,Aoping He,Xiyong Chen,Nengneng Luo
The thermochemical reaction behaviors between Y 2 O 3 and calcium-magnesium-aluminosilicate (CMAS) at 1250 °C∼1400 °C were investigated. A continuous-dense reaction layer mainly composed of Y-apatite phase quickly forms within 15 min, and its slow increasing thickness depends on the molten CMAS infiltration along the Y-apatite grain boundaries, the dissolution of the Y-apatite phase into the melt, the inhibiting effect on the CMAS penetration, and the reaction time and temperature. The CMAS crystallization occurs due to the change of chemical composition and the formation of other reaction products. The dense reaction layer shows good resistance to the molten CMAS infiltration.
研究领域:
材料科学
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无机非金属材料
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高温材料
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陶瓷涂层
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腐蚀与防护
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高影响因子
ACS Applied Materials & Interfaces
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2021
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IF 9.229
Qiujun Hu,Wenbin Qiu,Longqing Chen,Jie Chen,Lei Yang,Jun Tang
Due to the excellent thermoelectric performance, bismuth telluride (Bi2Te3) compounds are highly promising for the thermoelectric conversion in the room temperature range. However, the inferior thermoelectric performance of the n-type leg severely restricts the applications of Bi2Te3-based thermoelectric couples. Herein, n-type Bi2Te2.7Se0.3 (BTS)-based thermoelectric materials incorporated with nanosized Y2O3 (0.5–3 wt %) are prepared and their thermoelectric properties are systematically studied. The dramatically improved thermoelectric performance is ascribed to the realization of a multiscale feature of Y2O3 nanoparticle (NP)-induced interfacial decorations distributed along grain boundaries, which creates massive BTS/Y2O3 interfaces for the manipulation of carrier and phonon transport properties. The geometric phase analysis is employed to further confirm the condition of local strain in the BTS composite incorporated with Y2O3 NPs. Due to the presence of heterointerfaces and high density of dislocations in BTS matrices, the minimum lattice thermal conductivity (κl) of the nanocomposites (NCs) is dramatically suppressed from 0.76 to 0.37 W m–1 K–1. With the incorporation of 3 wt % Y2O3 NPs, the Vickers hardness of the BTS/Y2O3 NC is increased by about 32%. Overall, the BTS + 1.5 wt % Y2O3 NC maintains excellent thermoelectric properties (ZTave = 1.1) in the whole operative temperature range (300–500 K). The present strategy of implementing high-density heterogeneous interfaces by Y2O3 NP addition offers an applicable pathway for fabricating high-performance thermoelectric materials with both optimized thermoelectric properties and mechanical properties.
研究领域:
材料科学
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热电学
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纳米复合材料
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能量转换
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DOI
高影响因子
Advanced Optical Materials
·
2026
·Vol. 14
·期 32
·e71512
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IF 7.2
Ming Qiang,Kai Li,Zhuoying Chen,Jia Tong,Bingheng Sun,Yanna Tian,Xiaomeng Yin,Jintai Fan,Long Zhang
Y 2 O 3 -MgO composite ceramics possess intrinsic advantages in the 3–5 µm mid-infrared region, including theoretically high transmittance, high mechanical strength, and low emissivity, making them promising candidates for next-generation infrared window materials for high-speed flight applications. However, further process optimization is still required to improve their practical performance. In this study, YM composite powders were prepared via the glycine-nitrate combustion method. A fluorination strategy was introduced for the first time through ball milling during powder processing. Combined gravimetric water vapor adsorption measurements and first-principles calculations revealed that fluorination enhances the hydrophobicity of the powders, thereby improving resistance to moisture absorption of MgO. Sintering kinetics analysis further demonstrated that an appropriate level of fluorination promotes densification, suppresses grain growth, and consequently improves infrared transmittance. Overall, 0.05 wt% fluorination increases powder hydrophobicity by nearly 20%, enables a transmittance exceeding 80% in the 3–5 µm range, and achieves an average flexural strength of 375 MPa. To the best of our knowledge, this is the first systematic study on the preparation of fluorinated YM composite ceramics, providing a new perspective for processing optimization of this ceramic system.
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