COMPOSITES PART B-ENGINEERING
·
2024
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IF 12.7
Xianghui Zeng,Xuelin Bu,Hui Chen,Zhaohui Huang,Wei Fang,Daheng Wang,Xuan He,Xing Du,Weixin Li,Haijun Zhang,Lei Zhao
Hexagonal borocarbonitride (h-BCN) have garnered significant attention for their unique optoelectronic properties in solar-to-fuel conversions. However, the efficiency of h-BCN in the field of photocatalytic CO 2 reduction is limited by high reaction energy barriers and serious charge recombination. Here, a Y-modified h-BCN were synthesized through an organic-inorganic hybrid precursor pyrolysis method. Both theoretical simulation and experimental analysis demonstrated that the Y-modified sample exhibits an inhomogeneous charge distribution that favours rapid charge transfer and can decrease the reaction barrier of the rate-control step. Further investigations indicated that adding Y changes the electronic structure of BCN, which leads to rapid charge transfer/separation and an increased lifespan for photoinduced electrons. As a result, 2.5%Y/BCN exhibited improved CO 2 photoreduction activity with a fuel yield of 50.35 μmol g −1 . Notably, this outstanding performance was achieved without the use of any cocatalyst or sacrificial agent. In the meanwhile, cycle test shows the photocatalyst's great stability. The findings provide a useful suggestions for BCN-based photocatalysts.
研究领域:
材料科学
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环境科学
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化学工程
✓ 已验证
产品关联
DOI
高影响因子
Desalination and Water Treatment
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2025
·
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
✓ 已验证
产品关联
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
✓ 已验证
产品关联
DOI
高影响因子
INORGANIC CHEMISTRY COMMUNICATIONS
·
2025
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IF 5.4
Quanhui Zhang,Naikun Sun,Kang Zhao,Meiling Li,Qin Dai,Xinguo Zhao,Juan Cheng,Jiaohong Huang
Magnetic refrigeration in the liquid-helium temperature region plays a significant role in many technological fields. In this work, the crystal structure, magnetic properties, and magnetocaloric effect (MCE) of commercial Yb 2 O 3 and a series of (Yb 1-x Ho x ) 2 O 3 (x = 0, 0.1, 0.2) compounds prepared by a feasible high-energy ball milling method were systematically investigated. The crystallography results demonstrate that these Yb 2 O 3 -based compounds have a cubic bixbyite structure with space group Ia 3 ¯ , and the lattice constant increases with the increase of Ho 3+ ions content. Commercial Yb 2 O 3 shows antiferromagnetic (AFM) ordering at 2.35 K, and ball-milled (Yb 1-x Ho x ) 2 O 3 (x = 0, 0.1, 0.2) compounds have lower AFM ordering temperatures of RE 3+ moments of 2.30 K, 2.15 K and below 2 K for x = 0, x = 0.1 and x = 0.2 samples, respectively. Thermomagnetic behavior under high magnetic fields exhibited the existence of ferromagnetic (FM) correlation in these compounds, and a high magnetic field could induce an AFM to FM transition. The magnetization of Yb 2 O 3 increases with the increase of Ho 3+ ions content due to the increase of the effective magnetic moments. The maximum magnetic-entropy change Δ S M and relative cooling power RCP of (Yb 0.8 Ho 0.2 ) 2 O 3 are 11.1J/kg·K and 123.2 J/kg, respectively under 5 T, which are 19.4 % and 67.6 % larger than those of commercial Yb 2 O 3 . The (Yb 1-x Ho x ) 2 O 3 (x = 0, 0.1, 0.2) compounds have a large MCE under moderate magnetic field changes and there is no thermal and magnetic hysteresis, which is beneficial for application as a promising refrigerant near the liquid-helium temperature range.
研究领域:
材料科学
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低温物理
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产品关联
DOI
高影响因子
INTERNATIONAL JOURNAL OF ENERGY RESEARCH
·
2021
·Vol. 45
·期 14
·19883-19894
·
IF 5.164
Shilin Luo,Zhitong Xu,Jian Liu,Baoliang Xu,Shiyin Ji,Yi Ding,Shengtai Zhang,Ling Zhang,Tao Duan,Jiehong Lei
Summary Yttrium iron garnet (YIG) is a potential matrix for immobilizing high-level radioactive waste (HLW) due to its high actinide solubility and chemical flexibility. In this study, Ce was employed as a surrogate of Pu. A series of Y 3- x Ce x Fe 5 O 12 (0 ≤ x ≤ 1) samples were prepared by solid-state sintering at 1400°C to investigate the solubility, microstructure, and chemical durability of Ce-doped YIG. The X-ray diffraction (XRD) and scanning electron microscopy (SEM) results showed that the solubility of the Ce in a single garnet was 32 mol% at synthesis temperature of 1400°C. The SEM analysis indicated the YIG ceramic grain growth and compactness as Ce concentrations increased. The XPS analysis indicated that the amount of Ce 4+ out of the total Ce increased as the CeO 2 doping increased, and the maximum value was more than 75.9% in the sample synthesis at 1400°C. Static leaching experiments were also conducted on the single Ce-doped garnet synthesized at 1400°C. The normalized LR Ce and LR Y release rates were approximately 10 −4 and 10 −5 g m −2 d −1 after 42 days, respectively. The chemical durability was comparable to other ceramic matrices (such as pyrochlore and zircon, among others). These results demonstrated that YIG ceramics are suitable for immobilizing HLW, such as Pu or U. Highlights The solubility of Ce in single-phase YIG was 32 mol% at 1400°C. Grain size and compactness increased Ce content. The concentration of Ce 4+ in total Ce of sample could be over 75.9%. The obtained YIG ceramics exhibit excellent chemical stability. Novelty Statement Y 3-x Ce x Fe 5 O 12 ceramics were prepared by solid-state sintering and the solubility, microstructure, and chemical durability were investigated. The solubility of Ce was 32 mol% at 1400°C. The obtained YIG ceramics exhibit excellent chemical stability.
研究领域:
材料科学
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核废物管理
✓ 已验证
DOI
高影响因子
CERAMICS INTERNATIONAL
·
2018
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IF 3.057
Di Jiang,Yanfei Wang,Siqing Wang,Rongjun Liu,Jing Han
The yttrium heavily doped La 2 Zr 2 O 7 solid solutions coatings, with a Y to La molar ratio of 1:1, have been successfully prepared by air plasma spraying technique. The evolution of phase composition, phase structure and thermal conductivity of such coatings with annealing at 1300 °C has been investigated. The results show that, a single pyrochlore structure can be retained for coating after annealing up to 48 h, beyond which the fluorite phase begins to precipitate out. By comparing thermal conductivities to those undoped counterparts at a similar porosity level, we find a considerably flat thermal conductivity versus temperature (k-T) curve, suggesting the existence of a strong phonon scattering source, which is inferred as rattlers. In addition, after the segmentation of the fluorite phase, the thermal conductivity of corresponding coatings rises considerably, indicating that the fluorite phase has a higher thermal conductivity than that of pyrochlore phase. Moreover, while the as-sprayed coatings show a clear indication of radiative thermal conduction beyond 1000 °C, the thermal conductivity of annealed coatings do not show such an uprising trend after 1000 °C, suggesting that the radiative thermal conduction has been greatly suppressed. The reason is proposed as the formation of local dipoles due to local enrichment of certain elements influences the propagation of electromagnetic waves and thus suppresses the radiative thermal conduction.
研究领域:
材料科学
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热力学
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涂层技术
✓ 已验证
DOI
高影响因子
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
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2022
·Vol. 33
·期 14
·11318-11331
·
IF 2.779
Li Yueying,Ma Yan,Wang Zhoufu,Liu Hao,Wang Xitang,Dong Yunjie,Qian Weilun
Yttrium ferrite (YFeO 3 ) is highly attractive as a promising multiferroic material and also has been proven to have potential in the field of near-infrared reflective cold pigments. In this work, YFeO 3 powders were fabricated via metal citrate xerogel mediated molten salt procedure at different temperatures. The complexation process of the metal citrate xerogel as a precursor was promoted by the salt medium, and the molten salt medium reduces the reaction temperature to obtain morphologically distinctive YFeO 3 without impurity. The orange YFeO 3 powders possessed outstanding near-infrared reflection characteristics and high solar reflectance. The relationship of particle size, particle shape, charge state distribution, magnetic performance and near-infrared reflection performance of YFeO 3 was investigated. Specifically, with the increase of calcining temperature, particle size increases, thereby increasing the infrared reflectivity. The rising in the amount of Fe 2+ –Fe 3+ ion pairs increased the absorption of free carriers, thereby reducing the infrared reflectivity. The two factors contributed together to the near-infrared reflectivity, which first increased and then decreased with the increase of calcining temperature. In addition, the increase in the ratio of Fe 2+ also hindered the super-exchange and Dzyaloshinskii–Moriya interaction of Fe–O–Fe, thereby improving of the weak-ferromagnetic behavior of YFeO 3 .
研究领域:
材料科学
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物理学
✓ 已验证
DOI
高影响因子
International Journal of Applied Ceramic Technology
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2025
·
IF 2.3
Bixian Zhang,Kai Yang,Zhuohang Li,Sihao Jian,Bei Ren,Ziqian Meng,Yinghui Tang,Yang Miao
Yttrium iron garnet (YIG) ferrite is extensively utilized in microwave devices due to its exceptional fundamental electromagnetic properties and easily adjustable magnetic properties. In recent years, there has been a growing interest in investigating high-entropy garnets. However, its dielectric properties have not been extensively studied. This study prepared a series of bismuth-containing high-entropy yttrium iron garnet ferrites (Bi 0.6 Gd 0.6 Ho 0.6 Y 0.6 Re 0.6 ) Fe 5 O 12 (Re = Dy, Er, Tm, Yb) using the solid-phase reaction method. The addition of Bi 3+ to the high-entropy matrix resulted in a reduction of the optimal phase forming temperature of garnet from 1450°C to 1150°C. Despite the incorporation of Bi 3+ with a relatively large ionic radius, no heterophase generation occurred, leading to the formation of a single garnet phase. These high-entropy garnet samples exhibited unique magnetic properties along with high dielectric constants and low dielectric losses. Specifically, the dielectric constant (ε') of sample HEYIG-4 is measured at 20.26, with a low dielectric loss of just 2.78 × 10 −3 , while the specific saturation magnetization reached 16.86 emu/g. This paper expanded research within the field of high-entropy garnet ferrites.
研究领域:
材料科学
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物理学
✓ 已验证
产品关联
DOI
高影响因子
CERAMICS INTERNATIONAL
·
2025
·
IF 5.6
Ya-Nan Feng,Fei-Fan Wang,Weiwei Xiao,Yan Xia,Bin Wei,Shuaihua Wang,Zhonghua Deng,Fei-Fei Chen,Lingyun Li,Yan Yu
In this study, divalent calcium cation with large radius and trivalent yttrium cation with small radius were introduced to develop co-stabilized zirconia ceramics with both superior mechanical properties and aging resistance. Through a reverse coprecipitation-hydrothermal method, a series of ultrafine x CaO- y Y 2 O 3 -ZrO 2 ( x = 2.0, 3.0, y = 0.5, 1.0, 1.5, 2.0 ) raw powders with high quality were fabricated for the production of nanostructured ceramics via low-temperature pressurelessly sintering. The sintering process was optimized by investigating the effects of sintering temperature on densification, grain growth and phase evolution. The minimally doped 2.0 CaO- 0.5 Y 2 O 3 -ZrO 2 ceramic retained pure tetragonal phase at room temperature, achieving a balance of excellent toughness and high aging resistance. The impacts of chemical composition on microstructure, hardness, toughness and aging resistance were examined for these x CaO- y Y 2 O 3 -ZrO 2 ( x = 2.0, 3.0, y = 0.5, 1.0, 1.5, 2.0 ) ceramics. The segregation of calcium and yttrium cations at grain boundaries effectively tailored the microstructure. It was observed that substituting small trivalent yttrium cations for large divalent calcium cations effectively enhanced the aging resistance without sacrificing mechanical properties, due to the strengthened grain boundaries and asymmetrical distribution of cations among grains. This work not only produces low-doped zirconia ceramics with both excellent mechanical properties and aging resistance, but also presents straightforward method for preparation of high-quality raw powders and delicate microstructural engineering during sintering for developing advanced structural ceramics.
研究领域:
材料科学
·
陶瓷工程
✓ 已验证
产品关联
DOI
高影响因子
LANGMUIR
·
2025
·
IF 3.9
Lijia She,Nan Li,Yi Wu,Xi Xi,Yafei Liu,Peng Shen,Gang Zhao,Jiangquan Ma
Designing efficient and stable oxygen evolution reaction (OER) catalysts is of great significance for hydrogen production technology through the electrolysis of water. Nickel sulfide (NixSy) has garnered considerable attention as an OER electrocatalyst owing to its high electrical conductivity and distinctive structure. Herein, Ni3S4–Yb2O3 on nickel foam electrocatalysts was fabricated through a hydrothermal synthesis approach to optimize the performance of Ni3S4. The incorporation of Yb2O3 induced charge redistribution within Ni3S4, expanded the active surface area, and enhanced the availability of active sites. Consequently, the Ni3S4–Yb2O3/NF catalyst demonstrates exceptional electrocatalytic performance in 1 M KOH, attaining a current density of 10 mA cm–2 at a minimal overpotential of 148 mV, along with an ultralow Tafel slope of 47.3 mV dec–1. In addition, we have confirmed that another reason for the improved performance is that Yb2O3, as an electron donor, can effectively regulate the defects of the Ni atoms. This work offers a feasible strategy for developing highly effective OER electrocatalysts in alkaline media.
研究领域:
材料科学
·
电化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
ACS Applied Materials & Interfaces
·
2025
·
IF 8.2
Zhen He,Chen Ma,Huangxu Li,Chengming Wang,Lingwen Liao
Metastable crystal defects endow nanocrystals with optimized electronic configurations and remarkable electrocatalytic properties. Nevertheless, how the crystal defects, such as twin boundaries, regulate the nucleation and growth of multimetallic heterostructures requires further study. Herein, platinum–yttrium (PtY) alloys with a metastable twin structure were fabricated by overgrowth on Au nanoparticles, resulting in the formation of Au@PtY multibranched nanodendrites (Au46Pt40Y14). The branched Au@PtY nanoparticle exhibits a Y-rich twin structure on the surface, as affirmed by both experimental investigation and theoretical calculation. Impressively, branched Au@PtY nanoparticles demonstrate superior mass activity and stability toward the alcohol oxidation reaction, compared to core–shell Au@PtY nanoparticles (Au67Pt25Y8), PtY nanodendrites (Pt73Y27), and commercial Pt/C catalysts. Density functional theory calculations, together with operando infrared reflection absorption spectroscopy, suggest that the superior electrochemical characteristics could be ascribed to the Y-rich twin on the surface. This work opens the way for the rational design of heterometallic nanostructures with crystal defects for catalytic applications.
研究领域:
材料科学
·
电催化
✓ 已验证
产品关联
DOI
PubMed
高影响因子
RARE METALS
·
2025
·
IF 11
Li Qiu-Hao,Zhou Qi,Wang Yun-Long,Chen Rui-Jie,Chen Chong
Nuclear energy provides a competitive path for reduction of CO 2 with water, whereas the high-efficiency utilization of radiolytically produced active species for oriented transformation remains challenging. Herein, we report the assembling of yttrium-decorated bimetallic MOFs via one-step hydrothermal strategy, which can act as a sensitized nanoreactor for syngas production under γ-ray irradiation. The flower-shaped CuNi-MOF matrix with tunable metal centers exposed plentiful cooperative active sites for CO 2 binding, and its nanopetals enabled the well dispersion of Y 2 O 3 nanoparticles on the surfaces. The introduction of high- Z element Y enhanced the secondary electron scattering and promoted the water radiolysis to produce more hydrated electrons (e aq − ), thus accelerating the initial CO 2 activation to CO 2 •− . Moreover, the in situ formed coupling interlayer provided a fast charge transfer channel between Y 2 O 3 and the MOF framework, which facilitated the interfacial electron migration for intermediate generation and subsequent CO 2 conversion. By regulating the contents of Cu and Y 2 O 3 within the nanocomposites, the affinity toward CO 2 and the product compositions could be modulated. As a result, the optimal 7CN-2Y catalyst achieved a high syngas evolution rate of 311.07 μmol g −1 with a H 2 /CO ratio of 2.7:1 at an absorbed dose of 4 kGy. The present study offered a feasible route for the efficient transformation of CO 2 into valuable chemicals and the design of viable catalysts for ionizing radiation. Graphical abstract
研究领域:
核能化学
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材料科学
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环境科学
✓ 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）