Crystals
·
2021
·Vol. 11
·期 11
·1328
·
IF 2.589
Daini Wang,Wenxia Wu,Xiaojun Tan,Bernard A. Goodman,Shoulei Xu,Wen Deng
As a development on previous research on single crystals of Pr3+-doped yttria-stabilized zirconia (YSZ), we report here the preparation and optical properties of Yb/Pr co-doped YSZ single crystals with different Yb2O3concentrations. Results from X-ray diffraction (XRD) and Raman spectroscopy indicated that all of the crystal samples had a cubic phase structure, and transmission was ≥88% in the 550–780 nm range. Photoluminescence (PL) under excitation with a 980 nm laser showed upconversion emission, and several peaks were observed centered on 448 nm, 508 nm, 525 nm, 542 nm, 617 nm and 656 nm. The effects of excited state absorption (ESA), energy transfer upconversion (ETU), cross relaxation (CR), and cooperative energy transfer (CET) on the upconversion luminescence and energy transition mechanism in YSZ crystals were further studied. The fluorescence lifetime of the3P0→3H5transition at 542 nm reached 207 μs, which shows that the samples are of potential use for laser and fluorescence output.Keywords:optical floating zone method;yttria-stabilized zirconia (YSZ) single crystal;Pr/Yb co-doped;upconversion luminescence
研究领域:
材料科学
·
光学
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高影响因子
Materials Today Communications
·
2025
·
IF 4.5
Peilin Cao,Jiahua He,Cong Wang,Dejin Yan,Nai Lin,Ji’an Duan
The joint strength of ceramic/metal interfaces has become one of the major technical difficulties in the development of solid oxide fuel cells. Hence, a method to fabricate 3D cone structure arrays on the surface of yttria-stabilized zirconia (YSZ) and stainless steel (Crofer 22 APU) by femtosecond laser machining technique is proposed to improve its shear strength. Compared to the shear strength of flat substrate (5 MPa), the optimized strength (23.4 MPa) is 4.7 times that of the original strength. Increasing the sintering temperature from 200 °C to 350 °C enhances the mobility and sintering of Ag nanoparticles, leading to a denser Ag layer and consequently improving the interfacial connection strength. Cross-sectional analysis of the sintered joint reveals that the 3D cone structure forms a mechanical interlock with the Ag layer, enhancing the interfacial shear strength. A finite element analysis model is also established for revealing the shear stress distribution in the Ag layer with microstructure.
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高影响因子
CERAMICS INTERNATIONAL
·
2026
·
IF 6
Cui Qiao,Jie Yu,Jijun Lu,Zhengyuan Fan,Guoqiang Lv,Xiufeng Li,Shaoyuan Li,Wenhui Ma
Y 0.15 Zr 0.85 O 1.93 (YSZ) is a key electrolyte material for solid oxide fuel cells (SOFCs), and its performance is strongly governed by the sintering process. Conventional sintering (CS) and ultrafast sintering (US) typically yield fine-grained YSZ microstructures in which the high density of grain boundaries impedes O 2− migration. In this study, a fast hot-press sintering (FHPS) process is proposed, which combines rapid resistive heating of a graphite die with the simultaneous application of uniaxial pressure. At temperatures 200°C and 100°C lower than those of the CS and US processes, respectively, this integrated process produced high-quality YSZ ceramics with a relative density of 99.2% and an average grain size of 25.68 μm. Electrochemical impedance spectroscopy revealed that at 500°C, the ionic conductivity of the FHPS sample was approximately 10 and 3 times higher than those of the CS and US samples, respectively; at 800°C, the ionic conductivity of the FHPS sample reached 0.04 S cm −1 . This significant enhancement in conductivity is primarily attributed to the substantial reduction in grain boundary density resulting from pronounced grain growth: the high-density, large-grain microstructure obtained through the FHPS process effectively reduces the number of grain boundaries per unit transport path, lowers the grain boundary resistance to O 2− migration, and decreases the migration activation energy. Mott–Schottky analysis further reveals that FHPS-processed samples exhibit a reduced space charge potential at grain boundaries, which additionally contributes to the observed improvement in grain boundary conductivity. These results demonstrate that the FHPS process significantly enhances the ionic conductivity of YSZ electrolytes while substantially reducing the sintering temperature and shortening the sintering time, offering a promising technical pathway toward the scalable fabrication of high-performance SOFC electrolyte ceramics.
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高影响因子
JOURNAL OF MEMBRANE SCIENCE
·
2025
·
IF 9
Zhihao Jin,Yan Yue,Hao Xiong,Xianfu Chen,Minghui Qiu,Yiqun Fan
The elevated sintering temperatures required for conventional yttria stabilized zirconia (YSZ) electrolyte membranes pose a significant limitation to further application. In this study, a novel hydrothermal–vacuum filtration method was applied for membrane construction and a dense and integrated YSZ electrolyte membrane was prepared under a low sintering temperature of 1100 °C. Single phase structured YSZ with grain size less than 10 nm were obtained under optimal hydrothermal conditions. In addition, the lattice distortion induced by the incorporation of Y element stabilized the phase structure of the material and effectively introduced oxygen vacancies. A vacuum filtration route was employed to mitigate nanoparticle agglomeration and enable the stable fabrication of fully dense and homogeneous self-supported electrolyte membranes. The membrane properties obtained using this method were significantly superior to those prepared by conventional dry-pressing. Furthermore, the continuous grain boundaries formed by nanosized particles further enhanced the electrochemical properties of the electrolyte, resulting in a conductivity of 0.02 S/cm at 800 °C for the membrane sintered at 1100 °C. In conclusion, this study provides YSZ electrolyte membranes with outstanding performance and a low-temperature preparation method, both of which demonstrate significant potential for further application in the field of solid oxide cells (SOC).
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高影响因子
CERAMICS INTERNATIONAL
·
2025
·
IF 5.6
Xiaolong Yi,Yaning Tang,Yanlin Huang,Xin Wang,Jin Jiang,Weixin Deng,Kuo Jiang
Nano-nano t'-YSZ-Al 2 O 3 composites were synthesized in situ using sol-spray pyrolysis process. The composite powders were sintered into dense ceramics by spark plasma sintering at 1300 °C. The toughness of the composite ceramics was studied, and the microstructure was characterized in detail using X-ray diffraction spectroscope (XRD), scanning electron microscope (SEM), and transmission electron microscope (TEM). Microstructural analysis revealed that α-Al 2 O 3 , with a grain size of approximately 100 nm, was distributed along the grain boundaries of YSZ. Notably, the toughness of the YSZ-Al 2 O 3 composite ceramics with 10 wt% Al 2 O 3 addition (85±5 J/m 2 ) was nearly twice that of single-phase YSZ (43±3 J/m 2 ). It is suggested that the nano-toughening can be comparable to ferroelastic toughening. Materials with enhanced toughness can significantly improve the thermal cycling life of coatings, indicating that nano/nano YSZ-Al 2 O 3 composites hold considerable potential for practical applications.
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高影响因子
JOURNAL OF RARE EARTHS
·
2025
·
IF 7.2
Cui Qiao,Jie Yu,Guoqiang Lv,Shaoyuan Li,Jijun Lu,Fengshuo Xi,Zhongqiu Tong,Wenhui Ma
Y 0.15 Zr 0.85 O 1.93 (YSZ) has emerged as a crucial solid electrolyte material for modern solid oxide fuel cells (SOFCs) and oxygen sensors, prized for its exceptionally high oxygen ionic conductivity. However, further enhancement of its oxygen ionic conductivity is essential to optimize SOFCs energy efficiency and mitigate high-temperature electrode degradation. Despite extensive efforts involving various doping strategies, this critical challenge remains unsolved. To address this issue, a novel YSZ-LSGM heterostructure composite electrolyte was developed by adding a minor La 0.9 Sr 0.1 Ga 0.8 Mg 0.2 O 2.85 (LSGM) phase into the YSZ phase, and its performance as an electrolyte was systematically evaluated. LSGM’s high ionic conductivity promotes rapid oxygen ion transport across grain boundaries. The heterogeneous interface between YSZ and LSGM also favors oxygen ion transport, significantly enhancing both the grain boundary conductivity and the total ionic conductivity of the heterostructure composite. Remarkably, the YSZ-30 wt% LSGM composite demonstrates approximately 8 times in total conductivity (0.0008 S/cm at 750 °C) compared to pure YSZ (0.0001 S/cm at 750 °C). Most strikingly, the YSZ-30 wt% LSGM’s grain boundary conductivity is around 24 times higher than the YSZ electrolyte’s. These findings highlight the synergistic advantages of the heterostructure composite electrolyte, which combines the excellent compatibility of YSZ with the superior ionic conductivity of LSGM. This study not only provides a promising strategy for developing advanced composite electrolyte materials but also opens a new avenue for further research in high-performance SOFC technologies.
研究领域:
材料科学
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电化学
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能源技术
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固体离子学
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高影响因子
Journal of Physical Chemistry C
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2010
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IF 4.224
Shunwei Hu,Jia Zhu,Ling Wu,Xuxu Wang,Ping Liu,Yongfan Zhang,Zhaohui Li
Fluorinated In(OH)ySz solid solutions were synthesized via a hydrothermal method. The photocatalytic degradation of rhodamine B (RhB) over the fluorinated In(OH)ySz solid solutions revealed that the process of the de-ethylation of RhB was enhanced, while in the meantime, the rate of the mineralization of RhB was suppressed when In(OH)ySz was fluorinated. To elucidate the opposite effects of fluorination on the two processes of photocatalytic degradation of RhB (de-ethylation and mineralization) over In(OH)ySz, the adsorption of RhB over In(OH)ySz with and without fluorination, the active species involved in the de-ethylation and the mineralization of RhB, were investigated, and the electronic structure of fluorinated In(OH)ySz was studied. The results indicated that the major active species involved in the de-ethylation and the mineralization of RhB are different, that is, the hole direct oxidation leads to the de-ethylation of RhB, while the major active species responsible for the mineralization of RhB is the O2−• radical. The fluorination on In(OH)ySz solid solutions on one hand can enhance the adsorption of RhB on the catalyst surface, leading to a higher rate in the de-ethylation of RhB. On the other hand, fluorination lowers the conduction band of In(OH)ySz, which leads to a lower capability of the photogenerated electrons in the reduction of O2 to give O2−• radicals. Our results clearly show that the fluorine modifications can have ambilateral effects on the photocatalytic performance of semiconductor photocatalysts depending on the specific photocatalytic reactions.
研究领域:
材料科学
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光催化
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环境化学
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半导体催化
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高影响因子
CERAMICS INTERNATIONAL
·
2022
·
IF 5.532
Zhiqiang Feng,Xiangdong Zhang,Deli Luo
Insights into the pore–matrix interactions in solid oxide electrolytes are necessary to develop high-efficiency solid oxide electrolytic cells. The role of particle size in ink and printed electrolyte films was analyzed in this study. This is distinct from solid electrolytes that are dense as a whole but have micropores. Herein, we demonstrate that the organic binder in the ink can significantly reduce the number of closed pores in the electrolyte by taking advantage of its thermal softening characteristics. Electron microscopic analysis provides evidence that the binder controls the pore generation and affects the pore distribution in the electrolyte films. The effect and mechanism of micropores in the electrolyte on the electrochemical process (when used for high-temperature steam electrolysis) are discussed.
研究领域:
材料科学
·
电化学
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DOI
高影响因子
CERAMICS INTERNATIONAL
·
2023
·Vol. 49
·期 21
·34025-34037
·
IF 5.2
Dianchao Liu,Yongzhi Jing,Xiufang Cui,Zhuo Chen,Xinhe Wang,Yongchao Fang,Anying Liu,Guo Jin,Erbao Liu
The phase instability of 6–8 wt% Y 2 O 3 partially stabilized ZrO 2 (YSZ) in high temperature and molten salt corrosion environment seriously limits its application above 1200 °C. In this study, the chemical co-precipitation method prepared Yb 2 O 3 and CeO 2 co-doping YSZ (YbCeYSZ) ceramic materials to improve the above issues. It was proposed to improve the defect of high-temperature phase instability of CeO 2 -doped YSZ materials by adding Yb 2 O 3 . The phase stability, thermal insulation properties , and Na 2 SO 4 + V 2 O 5 molten salt corrosion behavior of YbCeYSZ ceramic materials were studied. The results showed that 2.5 mol% Yb 2 O 3 -4 mol% CeO 2 -YSZ material (2.5Yb4CeYSZ) had no monoclinic phase (m-ZrO 2 ) after holding at 1500 °C for 120 h due to forming more defect clusters in the system. Meanwhile, the 2.5Yb4CeYSZ had excellent thermal insulation performance and molten salt corrosion resistance , which was attributed to the strong phonon scattering in the 2.5Yb4CeYSZ material system and the low reactivity between the stabilizer and the corrosive salt.
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高影响因子
OXIDATION OF METALS
·
2020
·Vol. 94
·期 5
·397-408
·
IF 1.455
Zhang L.,Fan W.,Wang Y.,Liu K.,Wang Z. Z.,Bai Y.
This study aims to enhance the oxidation resistance of ceramic coatings through designing and optimizing microstructure. A series of double-layered lanthanum–cerium oxide (LC) and 8 wt% yttria-partially-stabilized zirconia (YSZ) coatings with different thickness ratios were tailored. The isothermal oxidation experiment and molecular dynamics simulation results suggested that due to the lower oxygen ionic diffusion coefficient, double-layered LC/YSZ coatings exhibited an excellent antioxidation property compared to the single-layer YSZ coating. However, with the increase of LC layer thickness in LC/YSZ coatings, sintering-induced vertical cracks were easily formed within LC layer, which significantly shortened the oxidation resistance of LC/YSZ coatings by a burner rig test at 1225 °C. The equivalent thermal growth oxide thickness manifested that the optimum thickness ratio between LC and YSZ layers was 1:2.
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高影响因子
CERAMICS INTERNATIONAL
·
2026
·
IF 5.6
Xinyuan Li,Yixin Xiao,Haizhong Zheng,Peifeng Zhou,Guifa Li,Yongxiang Geng,Mengxue Xia
Yb 3+ -Ce 4+ -La 2 Zr 2 O 7 / yttria stabilized zirconia (LYZCO/YSZ) thermal barrier coatings (TBCs) are susceptible to corrosion by high-temperature CMAS (calcium-magnesium-aluminosilicate). In this paper, a femtosecond laser was used to modify periodic raised structures (with a base diameter of 100 μm, a height of 120 μm, and an interval of 70 μm) on the surface of the glazed LYZCO/YSZ coating. The results show that by introducing raised microstructures on the glaze layer, the stable contact angle of molten CMAS significantly increases from 28° (unmodified) to 73° (modified). After corrosion at 1250 °C for 1 h and 2 h, the average reaction layer thickness of the modified glazed coating (LC-LYZCO/YSZ) was 8.0 ± 1 μm and 11.0 ± 1 μm, respectively. Compared with the unmodified glazed coating (LG-LYZCO/YSZ), this corresponds to a reduction of ∼28% and ∼21% in thickness. This structure effectively delays the wetting and penetration of high-temperature CMAS by suppressing the lateral diffusion rate of CMAS and intensifying the interfacial reaction, providing a novel technical insight for the research on the resistance of TBCs to CMAS corrosion.
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高影响因子
SENSORS AND ACTUATORS B-CHEMICAL
·
2021
·
IF 7.46
Siyuan Lv,Yueying Zhang,Li Jiang,Lianjing Zhao,Jing Wang,Fangmeng Liu,Chenguang Wang,Xu Yan,Peng Sun,Lijun Wang,Geyu Lu
A mixed potential type yttria-stabilized zirconia (YSZ)-based NO 2 sensor attached with NiO sensing electrode (SE) with efficient three-phase boundary (TPB) processed by electrospinning technology was fabricated. The effect of the structure and area of TPB on the gas sensing performance of the sensor was investigated systematically. The YSZ nanofiber array was directly deposited on YSZ substrate by electrospinning method to construct efficient three-dimensional TPB. The sensor (S30) based on YSZ substrate processed by electrospinning method with the flow rate of 1.5 mL/h for 15 min and NiO-SE exhibited the highest sensitivity (77.4 mV/decade) to 5–500 ppm NO 2 at 510 °C, which was 2.6 times as the sensor (S00) with unprocessed YSZ substrate. The response value of S30 to 100 ppm NO 2 could reach 109 mV at 510 °C, which increased about 51 mV comparing with S00. Moreover, the sensor (S30) also displays fast response and recovery rates, good repeatability, excellent selectivity, moisture resistance and long-term stability. The elevated NO 2 sensing performance of the sensor is attributed to more active sites of electrochemical reactions by increased area of three-dimensional TPB.
研究领域:
材料科学
·
传感技术
·
环境监测
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高影响因子
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