JOURNAL OF PHYSICS D-APPLIED PHYSICS
·
2016
·Vol. 49
·期 34
·345102
·
IF 2.772
Lei Wu,LiDong Dai,HePing Li,YuKai Zhuang,KaiXiang Liu
Yttrium-doped BaZrO3 (BZY) is a promising electrolyte for intermediate-temperature protonic ceramic fuel cells. However, BZY exhibits a high resistance because of the blocking effect of the grain boundaries. In this study, the effect of pressure on undoped and 5% yttrium-doped BaZrO3 (BZY0 and BZY5) were investigated at 0.45–24.01 GPa and 273–673 K with a diamond anvil cell. Their bulk, grain boundary, and total electrical conductivities were determined by impedance spectroscopy and direct-current resistance measurement. Both samples tended to show increasing electrical conductivity with increasing pressure, although each showed a discontinuous inflexion point (at ~14.54 GPa for BZY0 and at ~11.11 GPa for BZY5) indicating a phase transition from a cubic to a tetragonal structure. The samples showed a 3.43 GPa difference in the onset pressure of the structure change. Characteristic parameters, including space charge potential, relaxation frequency, and transport activation energy, were obtained before and after the phase transition. The results suggest that pressure significantly improves oxygen ion conduction in acceptor-doped perovskites oxides.
研究领域:
材料科学
·
能源研究
✓ 已验证
DOI
高影响因子
Optical Materials Express
·
2017
·Vol. 7
·期 8
·3003-3010
·
IF 2.591
Hui Li,Yundong Zhang,Lin Shao,ZinMaung Htwe,Pin Yuan
High sensing sensitivity and accuracy is valuable for optical temperature sensors in practical applications. Er3+/Yb3+ co-doped BaZrO3 ceramics were prepared by the dry pressing method. The upconversion luminescence of Er3+/Yb3+ co-doped BaZrO3 ceramics was studied at a temperature range from 300 to 500 K under different pump power. The ratio of non-thermal coupling levels of 4S3/2, 4I9/2→4I15/2 (I546/I875), and 4F9/2, 4I9/2→4I15/2 (I658/I875) show a linear relationship as the temperature increased. The maximum relative sensitivity was estimated to be 1.39% K−1 at 500 K under 90 mW pump power. The result indicated that the BaZrO3:Er3+/Yb3+ ceramic is a promising candidate for high temperature sensing applications.
研究领域:
材料科学
·
光学
✓ 已验证
产品关联
DOI
高影响因子
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
·
2025
·
IF 8.3
Yanru Yin,Qi Xiao,Wenying Zhang,Kai Li,Dong Yan,Jian Li,Lichao Jia
Cathode materials greatly govern the performance of protonic ceramics fuel cells (PCFCs), and development of suitable cathodes for PCFCs now becomes important. In this study, the traditional proton conductor BaZrO 3 is tailored with Sr and Fe elements, aiming to design proper cathodes for PCFCs. The structural, electronic, and catalytic effects of dual-element doping on BaZrO 3 -based materials are systemically investigated. Experimental and computational analyses reveal that a 75 % iron doping concentration (BaZr 0 · 25 Fe 0 · 75 O 3 ) markedly enhances oxygen vacancy concentration, reduces proton migration barriers, and elevates electrical conductivity. Notably, moderate strontium doping (50 %) synergistically improves performance, whereas excessive doping (75 %) induces adverse effects on oxygen vacancy concentration, proton migration, and electrical conductivity. The optimized Ba 0 · 5 Sr 0 · 5 Zr 0 · 25 Fe 0 · 75 O 3 cathode achieves a peak power density of 945 mW cm -2 at 700 °C. These findings elucidate the interplay between dopant elements, doping concentrations, and material properties related to electrochemical performance, offering actionable strategies for designing high-performance PCFC cathodes.
研究领域:
材料科学
·
能源科学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF THE AMERICAN CERAMIC SOCIETY
·
2024
·
IF 3.5
Bin Liu,Jie Fan,Hongqiang Nian,Yiran Li,Huimin Xiang,Yanchun Zhou
Sintering and phase transitions of materials in current large-area thermal insulation systems are critical problems for hypersonic vehicles. Searching for thermal insulation materials with good structure stability, thermal stability, and superior insulation performance is urgent for the development of these vehicles. Herein, we reported a novel porous BaZrO 3 ceramic fabricated by a particle-stabilized foam method. By controlling the sintering temperature, the porosity (92.96%–94.62%), thermal conductivity (0.088–0.193 W/(m·K)), and strength (0.30–1.31 MPa) of the porous ceramics are tunable. Most importantly, these porous BaZrO 3 ceramics exhibit excellent sintering resistance. After being heat treated at 1300°C for 6 h, the shrinkage of porous BaZrO 3 ceramics is nearly 0. The shrinkage of the samples heat-treated even at 1600°C is still lower than 3%, demonstrating outstanding high-temperature structure stability. Our results demonstrate that porous BaZrO 3 ceramics are promising candidates for high-temperature thermal insulation applications.
研究领域:
材料科学
·
航空航天工程
✓ 已验证
产品关联
DOI
高影响因子
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
·
2024
·
IF 8.1
Chenxi Liang,Yan Fan,Zhenbin Wang,Yongquan Zhou,Mingjin Zhang,Cunhua Ma
Magnesium hydride (MgH 2 ) as a promising solid hydrogen syorage material has been extensively researched. but the higher separating temperature and sluggish kinetics hinder its large-scale practical application. To solve this problem, a BaZrO 3 nanocatalyst with abundant oxygen vancies is manuscripted, exerts significant improvement to the hydrogen storage performance of MgH 2 . Impressively, the onset dehydrogenation temperature of MgH 2 -10 wt% BaZrO 3 -O v composite is reduced markedly from 390 °C(for pure MgH 2 ) to 260 °C. Additionally, the composite can discharge 4.22 wt% H 2 with 10 min at 275 °C and a total dehydrogenation amouut of 5.88 wt% is achieved at 300 °C. For hydrogen absorption, the composite can rapidly recharge hydrogen at a low temperature of 150 °C and approximately 5.08 wt% H 2 can be absorbed at 275 °C within 10 min. The dehydrogenation activation energy of BaZrO 3 -O v -added MgH 2 is as low as 92.61 kJ mol −1 compared to pure MgH 2 (164.78 kJ mol −1 ). Meantime, the composite presents unexceptionable reversible kinetic performance with a retention rate of 97.35 % after 10 cycles. The excellent catalytic effects can be attributed to the in-situ generation of ZrO 2 -O v , BaO-O v and ZrH 2 from BaZrO 3 -O v during the first de-/rehydrogenation cycle, which function as nanosized active sites on MgH 2 matrix to accelerate electron transfer and provide abundant hydrogen diffusion channels. Density functional theory calculations results verify that the Mg–H length and dehydrogenation energy barrier are ameliorated through BaZrO 3 -O v . This work provides a unique perspective on modification MgH 2 by perovskiet-like BaZrO 3 -O v nanocatalyst.
研究领域:
材料科学
·
氢气储存
·
纳米催化
·
能源材料
✓ 已验证
DOI
高影响因子
JOURNAL OF THE AMERICAN CERAMIC SOCIETY
·
2024
·
IF 3.5
Kangkang Yuan,Chen Shu,Kexin Meng,Wenjun Zhao,Guosheng Sun,Jien Zhu,Jin Chen,Yunlong Huang,Chengshun Li,Xiaotong Jin
Calcium zirconate (CaZrO 3 )-based fibrous membrane is a promising candidate in high-temperature areas for its high melting point, good phase stability up to 1900°C, low thermal conductivity, and low cost. To further enhance the high temperature flexibility of CaZrO 3 -based fibrous membrane without sacrificing stability, modification methods should be conducted. In the present work, a CaZrO 3 -BaZrO 3 dual-phasic structure was proposed to modify the high-temperature properties from the standpoint of phase competition. CaZrO 3 -BaZrO 3 fibrous membranes were prepared with the combination of the electrospinning method and pyrolysis process. The decomposition process, phase transformation, crystallize size, and microstructure evolution of CaZrO 3 -BaZrO 3 precursor fibrous membrane were characterized. The grain size, particle size, NIR reflectivity, high-temperature stability, fire retardancy, and high-temperature flexibility were also characterized and compared with other CaZrO 3 -based fibrous membranes. The higher thermal stability and flexibility of the CaZrO 3 -BaZrO 3 fibrous membrane at 1200°C would make it a good candidate for high-temperature insulating, high-temperature supporting, and high-temperature filtration.
研究领域:
材料科学
·
化学工程
✓ 已验证
DOI
高影响因子
Journal of Materials Chemistry A
·
2024
·Vol. 12
·期 39
·26555-26567
·
IF 10.7
Jie Gu,Xinwei Sun,Lulu Jiang,Zihan Zhang,Truls Norby,Donglin Han
We herein report a first experimental account of surface protonic conductivity in chemisorbed and physisorbed water layers in porous perovskite alkaline earth zirconates AZrO3, measured by impedance spectroscopy in wet atmospheres. We have studied the effects of temperature, pH2O, H/D isotope exchange, A-site cation (A = Ca, Zr, Ba), sintering temperature, and cation non-stoichiometry, and supported conclusions by thermogravimetry (TG) and X-ray photoelectron spectroscopy (XPS) and infrared (IR) spectroscopy. The proton conduction in the chemisorbed layer dominates above 200 °C and exhibits small pH2O-dependences and large pre-exponentials, activation energies (90 ± 10 kJ mol−1), and H/D isotope effects, all consistent with protonic conduction by dissociated protons in a well-covering layer of mainly molecularly chemisorbed water. Differences between CaZrO3, SrZrO3, and BaZrO3 supported by XPS results suggest that the higher acidity of smaller A-site cations and under-coordinated cations in the surface increase the proton conductivity. Below 200 °C, protonic conduction in the 1st solid-like physisorbed water layer exhibits positive pH2O-dependences and strongly negative activation energies hence dominated by adsorption in a far-from-complete physisorbed layer. A vanishing isotope effect suggests that migration is not by free protons in the physisorbed layer, but a vehicular species such as hydroxide ions. At the highest relative humidities near room temperature, a sharp increase in conductivity is indicative of increasing mobilities as the thicker water layer goes liquid over a hydrophilic surface. If these results are transferrable to electron conducting perovskites used as positrode materials for proton ceramic fuel cells at, e.g., 600 °C, they suggest that the strong chemisorption of water may block oxygen adsorption, while the high activation energy limits and gives a strong temperature dependency to surface diffusion of protons.
研究领域:
材料科学
·
电化学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF ELECTROCERAMICS
·
2025
·
IF 2.6
Yang Chunli,Wang Lei,Li Jun,Yao Wei,Liang Yanru,Wang Kai,Yun Sining
Y-doped BaZrO 3 has emerged as a promising ceramic material for hydrogen separation membranes. The conductivity of Y-BaZrO 3 (BZY) ceramics is highly dependent on the concentration of oxygen vacancies. In this work, BZY further individually doped with In and Pr were prepared by the citrate sol–gel combustion method. Effects of doping on the ceramic phase structure, oxygen vacancies, and micromorphology were investigated using a range of analytical techniques, including XRD, Raman spectroscopy, XPS, and SEM. The conductivity, hydrogen permeability, and stability of BaZr 0.7 Y 0.2 In 0.1 O 3−δ (BZYI) and BaZr 0.7 Y 0.2 Pr 0.1 O 3−δ (BZYP) ceramics were systematically evaluated. Upon doping, BZYI exhibits the most favorable conductivity, reaching 9.98 × 10 −3 S·cm −1 in dry air at 800 °C. At 900 °C, with water vapor introduced on the sweep side, the hydrogen permeation fluxes of BZYI and BZYP are 3.50 × 10 −9 mol·cm −2 ·s −1 and 2.60 × 10 −9 mol·cm −2 ·s −1 , respectively. Both samples were exposed to boiling water and a 100% CO 2 atmosphere at 900 °C for 3 h. Post-treatment XRD, Raman, and SEM analyses reveal no formation of heterophase, indicating excellent phase and microstructural stability.
✓ 已验证
产品关联
DOI
高影响因子
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
·
2023
·
IF 7.2
Peng Qiu,Lei Wu,Kun Cheng,Shaowen Wu,Huiying Qi,Chunyan Xiong,Baofeng Tu
Fuel flexibility is one of the significant advantages of solid oxide fuel cells (SOFCs). The utilization of methane in SOFCs can not only reduce fuel costs, but also greatly expand its application scenarios, which is of great significance to the commercial development of SOFCs. However, when methane is directly used, Ni-based cermet anode suffers from coking, which seriously affects the durability of the cell. To alleviate the coking issue, a reforming layer outside the Ni-based anode-supporter was proposed in this study, and Ba 0.9 (Zr 0.8 Y 0.2 ) 1- x Ni x O 3-δ (BZYNi x , x = 0.05, 0.1, 0.15 and 0.2) was used as reforming layer material. Among BZYNi x catalysts, BZYNi 0.2 exhibited excellent catalytic activity toward dry reforming of methane, and methane conversion was as high as 85% at 750 °C. The excellent catalytic durability and coking-resistance of BZYNi 0.2 were also confirmed. When BZYNi 0.2 reforming layer was applied, the single cell fueled with CH 4 –CO 2 fuel showed significantly improved electrochemical performance, durability and coking-resistance. The utilization of BZYNi 0.2 reforming layer provides guidance for solving the coking issue of SOFC cermet anodes when fueled with hydrocarbon.
研究领域:
能源材料
·
催化化学
✓ 已验证
DOI
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2026
·
IF 6.7
Jiaqi He,Wenqiang Yu,Shaoyi Li,Peng Ji,Tianpeng Wen,Jingkun Yu,Zijun Peng,Lei Yuan
To address the issue of poor corrosion resistance for pure BaZrO 3 refractory, BaZrO 3 -Yb 2 O 3 composite refractory was designed and prepared in this study. The wettability of high-temperature alloy melt on the composite refractory, the interfacial reaction mechanism and the physical properties of the material were systematically studied. The wetting experimental results show that the wettability of the high temperature alloy melt on the surface of the BaZrO 3 -Yb 2 O 3 composite refractory is lower than that on the pure BaZrO 3 refractory. This phenomenon can be attributed to the synergistic effect of higher surface roughness and the better thermodynamic stability of the BaZrO 3 -Yb 2 O 3 composite refractory. The results of vacuum induction melting experiments show that the interfacial reaction products of the two refractory crucibles and the superalloy melt are ZrO 2 and BaAl 2 O 4 . Owing to the higher thermodynamic stability of BaZrO 3 -Yb 2 O 3 composite refractory, the thickness of the interfacial reaction layer between the BaZrO 3 -Yb 2 O 3 composite refractory and alloy melt is significantly reduced, which is about 1/3 of the thickness for the interfacial reaction layer than pure BaZrO 3 refractory. In addition, the yield strength of the GH4169 alloy melted in the BaZrO 3 -Yb 2 O 3 crucible is approximately 30% higher than that melted in the pure BaZrO 3 crucible. This is mainly due to the less consumption of the Al element during the reaction process between composite refractory and alloy melt, which increases the content of auxiliary strengthening phase in the alloy more, and thereby optimizes the mechanical properties of the alloy. Meanwhile, the thermal conductivity of the BaZrO 3 -Yb 2 O 3 composite refractory is reduced by approximately 45%, while the compressive strength is nearly doubled, which can effectively reduce the heat loss during the smelting process and significantly prolong the service life of the refractory. This study provides a new technical strategy and theoretical support for solving the technical problems of smelting of GH4169 alloy.
✓ 已验证
产品关联
DOI
高影响因子
CERAMICS INTERNATIONAL
·
2024
·
IF 5.1
Wangzhe Leng,Yanyu Liu,Shu Li,Xinyao Geng,Lu Liu,Yi Du
With the rapid development of broadband transducers, there is an increasing demand for enhanced electromechanical properties in lead-free piezoelectric ceramics. In this study, the strategies to enhance the electrical properties of ceramics were explored by doping BaZrO 3 into 0.96(K 0.48 Na 0.52 )Nb 0.96 Sb 0.04 O 3 -0.04(Bi 0.5 Ag 0.5 )ZrO 3 ceramics, inducing lattice distortion ( c / a ) and regulating the phase structure. The ceramics doped with 1.5 mol% BaZrO 3 demonstrate excellent electrical performance, with a piezoelectric coefficient ( d 33 ) of 545 pC/N, a relative dielectric constant ( ε r ) of 4126, and an electromechanical coupling factor ( k p ) of 54.1 %. The reduced c / a ratio and rhombohedral-orthorhombic-tetragonal phase structure reduce the polarization energy barrier and promote the ordered arrangement of ferroelectric dipoles, thereby enhancing the comprehensive performance of the ceramics. Lastly, the electrical impedance of ceramics is studied in detail and reveals the main conduction mechanism in the microscopic region. This research provides new insights into optimizing the electrical properties of ceramics through microstructural manipulation and demonstrates the potential application of KNN-based ceramics in high performance piezoelectric transducers.
研究领域:
材料科学
·
电陶瓷
·
压电材料
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）