KEY ENGINEERING MATERIALS
·
2016
·
IF 0
Jian Wu,Cheng Zhang,Jin Feng Xia,Dan Yu Jiang
In this study, Yttria-stabilized zirconia (YSZ) electrochemical sensors attached with the WS2 sensing electrode (SE) were fabricated and examined for NO2 sensing properties. Due to its internal stratiform structure, surface and edge of the lamella have high chemical activity, WS2 was used as a kind of highly efficient catalyst. WS2 was partial oxidated to WO3 at 400°C, and with the increment of temperature, oxidation will accelerate. The ΔEMF to 500 ppm NO2 was as high as 125mv at 400°C, while the value of WO3-based sensor was as small as 10 mv in the same condition. These WS2-attached devices gave a linear correlation between EMF and the logarithm of NO2 concentration from 30 to 500 ppm in the temperature range 350–500°C. The response time of the device is about 1 min at 400°C.
研究领域:
材料科学
·
环境科学
✓ 已验证
DOI
CERAMICS INTERNATIONAL
·
2023
·
IF 5.2
Chenghao Zhang,Chun Li,Xiaoqing Si,Jianwei Gao,Junlei Qi,Jian Cao
Cerium oxide (CeO 2 ) in the range of 0–16 mol.% is used to enhance the joint of Ag-based filler for brazing yttria-stabilized zirconia (YSZ) ceramic in the air. Ag–CeO 2 filler is first adopted to braze YSZ ceramic (3 mol.% yttria). The CeO 2 is found to cluster at the interface of YSZ and Ag seam, improving the wetting behavior of Ag-based fillers. The maximum shear strength of YSZ joints can reach 35.1 MPa using Ag–1CeO 2 fillers at 1050 °C/30 min. Moreover, CeO 2 is used to enhance the Ag–CuO filler for brazing YSZ ceramic. As the increase of CeO 2 content, the contact angle of Ag–CuO on the YSZ surface decreases first and then increases. The average shear strength could reach 76.5 MPa using Ag–CuO–8CeO 2 at 1050 °C/30 min. The CeO 2 could decrease residual stress by adjusting the linear expansion coefficient of Ag-based fillers. Therefore, this study provides a new strategy for exploring air brazing fillers.
研究领域:
材料科学
·
焊接技术
✓ 已验证
产品关联
DOI
高影响因子
SURFACE & COATINGS TECHNOLOGY
·
2020
·
IF 3.784
Guo Jin,Yongchao Fang,Xiufang Cui,Chang Wang,Dan Zhang,Xin Wen,Qingbo Mi
In this work, the YSZ fibers and multi-walled carbon nanotubes (MWCNTs) were respectively employed as the extra additive to make some effect to improve the mechanical and thermal properties of YSZ-La 2 Zr 2 O 7 double-layer (LZ) thermal barrier coatings (TBCs). The porosity, thermal conductivity , bonding strength , fracture toughness and thermal cycling behavior of coatings were tested and discussed. The results showed that the addition of YSZ fibers and MWCNTs could improve the properties of LZ coating. In particular, the LZ coating exhibited lower thermal conductivity than that of YSZ coating with single-layer. Compared with MWCNTs reinforced LZ coating, YSZ fibers reinforced coating showed the lowest thermal conductivity and highest bonding strength value, due to the outstanding reinforcement of fibers. In contrast, the LZ coating containing MWCNTs presented the highest fracture toughness value and the best thermal cycling behavior than those of LZ coating and LZ coating containing YSZ fibers, which were attributed to the lowest porosity existing in LZ coating with MWCNTs, contributing to the remarkable inhibition of crack propagation . Therefore, the addition of YSZ fibers and MWCNTs was expected to be a potential way to improve the mechanical and thermal properties of LZ-TBCs.
研究领域:
材料科学
·
工程热物理
✓ 已验证
DOI
高影响因子
DESALINATION
·
2025
·
IF 9.8
Xiaolian Jiang,Huanyu Zhou,Yuehua Zhang,Xiaowei Da,Xianfu Chen,Minghui Qiu,Yiqun Fan
The ceramic nanofiltration membranes are widely used in antibiotic desalination due to their high selectivity in separating antibiotics and salts. In this research, a high-flux, highly selective YSZ (yttria-stabilized zirconia) composite nanofiltration membrane was prepared using the sonochemical method. A well-stabilized sol with an average particle size ranging from 1 to 2 nm was obtained through controlled aging and dialysis processes. The doping of yttria effectively inhibited zirconia phase transformation during heat treatment, thereby enhancing membrane integrity and ensuring accurate separation performance. Simultaneously, a 50 nm thick nanofiltration membrane was fabricated on the optimized transition layer, improving its efficient selectivity for antibiotics and salts. At the calcine temperature from 360 to 500 °C, the membrane pore size was precisely tuned to three different MWCOs of 460, 1000, and 2300 Da, with corresponding pure water permeance of 30, 65, and 90 L·m −2 ·h −1 ·bar −1 , respectively. The nanofiltration membrane with a MWCO of 460 Da has retention rates for tetracycline, oxytetracycline, and doxycycline hydrochloride of 96.7 %, 97.6 %, and 99.6 %, respectively, with fluxes of 83.5, 83, and 81 L·m −2 ·h −1 . This study shows a highly efficient ceramic nanofiltration membrane with great potential for separating antibiotics and salts.
研究领域:
材料科学
·
环境工程
·
化学工程
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2016
·
IF 3.014
Guangsen Yu,Ting Shuai Li,Min Xu,Martin Andersson,Baihai Li,Hui Tang,Joe Parbey,Jing Shao
The Ni-YSZ cerment as a promising anode for solid oxide fuel cells and its performance strongly depends on its miscrocture. This work focused on fabrication of Ni-8YSZ nanofibers via an electrospinning technique using yttria and zirconia nanoparticles as precussors. The effects of viscosity on the quality of fibers were assessed by adjusting the polymer and solid contents in slurry. The fibers sintered at different temperatures showed varying morphologies and a bead-like chain at temperatures higher than 800 °C was obtained. Crystalization of the YSZ was completed above 1400 °C and NiO was above 800 °C. The porosity of the fiber structure can reach high up to 45% before NiO reducation. The nanocrystallization of an anode for SOFCs was beneficial to enhance the electrochemical reaction sites and also to reduce the difficulties for gas diffusion.
研究领域:
材料科学
·
能源工程
✓ 已验证
产品关联
DOI
高影响因子
CERAMICS INTERNATIONAL
·
2018
·
IF 3.057
Xinzhu Gan,Zhichao Yu,Kangkang Yuan,Chonghe Xu,Guanghui Zhang,Xinqiang Wang,Luyi Zhu,Dong Xu
Ce-doped yttria-stabilized ZrO 2 (YSZ) fibers were prepared with different Ce concentrations (0, 5, 10, 20 mol%) by the sol-gel method. The effects of Ce addition on the microstructure and mechanical properties of the YSZ fibers have been investigated. Compared with the pure YSZ fibers, the Ce addition could cause grain refinement whose mechanism was discussed. Moreover, mechanical measurements showed that the Ce addition could increase the Young's modulus and microhardness of the YSZ fibers. When the doping content was 10%, the values of Young's modulus and microhardness were improved by almost 3 times and 2 times compared with those of the pure YSZ fibers, respectively. Results show that the Ce addition could improve the thermal insulation , thermal conductivity at 800 °C being reduced by over one third (33.52%) when the amount of Ce increased to 20%.
研究领域:
材料科学
·
物理学
✓ 已验证
产品关联
DOI
高影响因子
MATERIALS SCIENCE FORUM
·
2016
·
IF 0
Chag Ku Ding,Jing De Zhang,Ya Lei Liu,Jin Yan Gou,Jun Peng Luan
A comparative study has been carried out on the effects of pore-forming agents on the microstructural characteristics and properties including porosity, microstructures, linear sintering shrinkage and mechanical strength of NiO/yttria stabilized zirconia (YSZ). Different pore-forming agents (soluble starch, graphite and activated carbon) were incorporated into NiO/YSZ at various mass mixing ratios (5%, 10% and 15%). The experimental results show that under the condition of same content, sintered samples using activated carbon as pore-forming agent had a higher porosity than that with identical content of the other two kinds of pore-forming agents. Sintered samples with 10.0 wt% activated carbon had a porosity of 35%. Section morphologies show that pores distributed uniformly and connected very well in the anode with activated carbon as pore-forming agent. The mechanical strength of these sintered samples with carbon as pore-forming agent was also higher. With the activated carbon particle size decreasing (from 100 mesh to 320 mesh), the open porosity of porous NiO/YSZ was reduced (from 31.7% to 30.9%). It may be concluded that The activated carbon is the better choice as pore-forming agent for NiO/YSZ anode.
研究领域:
材料科学
·
燃料电池研究
✓ 已验证
DOI
Green Energy & Environment
·
2020
·
IF 6.395
Li Ma,Yu Qiu,Min Li,Dongxu Cui,Shuai Zhang,Dewang Zeng,Rui Xiao
The chemical looping process, where an oxygen carrier is reduced and oxidized in a cyclic manner, offers a promising option for hydrogen production through splitting water because of the much higher water splitting efficiency than solar electrocatalytic and photocatalytic process. A typical oxygen carrier has to comprise a significant amount of inert support, to maintain stability in multiple redox cycles, thereby resulting in a trade-off between the reaction reactivity and stability. Herein, we proposed the use of ion-conductive yttria-stabilized zirconia (YSZ) support Fe 2 O 3 to prepare oxygen carriers materials. The obtained Fe 2 O 3 /YSZ composites showed high reactivity and stability. Particularly, Fe 2 O 3 /YSZ-20 (oxygen storage capacity, 24.13%) exhibited high hydrogen yield of ∼10.30 mmol g −1 and hydrogen production rate of ∼0.66 mmol g −1 min −1 which was twice as high as that of Fe 2 O 3 /Al 2 O 3 . Further, the transient pulse test indicated that active oxygen diffusion was the rate-limiting step during the redox process. The electrochemical impedance spectroscopy (EIS) measurement revealed that the YSZ support addition facilitated oxygen diffusion of materials, which contributed to the improved hydrogen production performance. The support effect obtained in this work provides a potentially efficient route for the modification of oxygen carrier materials.
研究领域:
化学工程
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
MATERIALS LETTERS
·
2025
·
IF 2.7
Shuting Hou,Yuanyuan Zhang,Zidi Geng,Sendong Zhou,Xilin Li,Jingjing Jiang,Wenbo Wei,Sen Lin,Hui Wu
Ceramic nanofibers offer high surface area, strength, and thermal stability but limited stress tolerance, restricting partitioning. We developed a highly curved YSZ nanofiber sponge (“Turb-YSZ”) via turbulent spinning, where high-speed eddy fields induce complex bending for enhanced mechanical support/flexibility/stress dispersion. Turb-YSZ achieved ultralow thermal conductivity (31.2 ± 0.8 mW/(m·K)), 31.3 % below conventional sponge, and optimal plasma/serum separation, reducing hemoglobin to 75 mg/dL, demonstrating promise for integrated thermal insulation/bio-separation in extreme/portable settings.
研究领域:
材料科学
·
纳米技术
·
生物医学工程
·
热工学
✓ 已验证
产品关联
DOI
高影响因子
SENSORS AND ACTUATORS B-CHEMICAL
·
2020
·
IF 7.1
Weiwei Meng,Ling Wang,Huizhu Zhou,Yongguang Liu,Lei Dai
Impedimetric NH 3 sensors using Yttria-stabilized zirconia (YSZ) as solid electrolyte and spinel-type oxide as sensing electrode (SE) were fabricated. Phase angle (θ) was employed as response signals to evaluate their sensing performance, as a comparison, modulus value (|Z|) response was also examined. The SE materials with nanostructure were in-situ introduced into the YSZ porous skeleton by impregnation technique. A series of spinel-type oxide MFe 2 O 4 (M = Ni, Zn and Co) were examined, and among these oxides, NiFe 2 O 4 was found to be the most excellent SE for NH 3 sensor. Sensing performance of the sensor was optimized by adjusting the loading amount and calcination temperature of the sensing material NiFe 2 O 4 and the sensor exhibits the best performance when the loading amount is 0.585 mg and the calcination temperature is 800 °C. Sensing performance of the sensor was tested in 50−1000 ppm NH 3 with temperature varying from 400 to 650 °C. Compared with modulus value (|Z|), θ as response signal improves sensing performance of NH 3 sensor. The sensor exhibits short recovery time, high sensitivity and reproducible response at 600 °C. The sensor has good anti-interference capability to CO 2 , CH 4 , H 2 , NO 2 and NO, but O 2 and relative humidity (RH) have a certain effect on sensing performance.
研究领域:
材料科学
·
传感器技术
✓ 已验证
DOI
高影响因子
SURFACE REVIEW AND LETTERS
·
2017
·
IF 0.491
FEI LI,JINGDE ZHANG,JUNPENG LUAN,YALEI LIU,JIANXUN HAN
The NiO/YSZ anode materials of SOFCs with Bi 2 O 3 as sintering aids were successfully prepared by dry-pressing process. The effects of Bi 2 O 3 content on the sintering properties of NiO/YSZ anode materials were studied, including the effects on the density, open porosity, weight loss, phase composition, microstructure, mechanical strength and electrical conductivity. In particular, the weight loss, relative density and bending strength of the sintered NiO/YSZ ceramics increased with the increase of Bi 2 O 3 content while the open porosity decreased gradually. The density of the NiO–YSZ ceramics with 6 wt.% Bi 2 O 3 sintered at 1250 ∘ C could reach that of the ceramics without Bi 2 O 3 sintered at 1400 ∘ C. For Bi 2 O 3 concentration higher than 6 wt.%, phase transformation of zirconia from monoclinic to cubic structure occurs, causing volume change and microcracks in the anode materials. Therefore, the optimum adding amount of Bi 2 O 3 is 6 wt.%, which can reduce the sintering temperature to 1250 ∘ C. The ceramics with 6 wt.% Bi 2 O 3 have relatively high bending strength and low sintering temperature. This is of great significance for improving the performance of the anode and cutting the cost.
研究领域:
材料科学
·
能源工程
✓ 已验证
DOI
高影响因子
Journal of Advanced Ceramics
·
2022
·Vol. 11
·期 6
·922-934
·
IF 11.534
Liu Wei,Xie Yongshuai,Deng Zhezhe,Peng Ying,Dong Jianhong,Zhu Ze,Ma Dehua,Zhu Luyi,Zhang Guanghui,Wang Xinqiang
Yttria-stabilized zirconia (YSZ) fiber composites are highly efficient thermal insulating materials; however, the poor thermal shock resistance limits their versatile applications. In the present study, YSZ fiber was mixed directly with Al2TiO5 fiber, which had an extremely low thermal expansion coefficient, to prepare YSZ−Al 2 TiO 5 (ZAT) fiber composites by compression molding and heat treatment. The minimum thermal expansion coefficient of the prepared ZAT fiber composites was measured to be 7.74×10 −6 K −1 , which was 26% lower than that of the YSZ fiber composites (10.42×10 −6 K −1 ). It was shown that the prepared ZAT fiber composites maintain the integrity after undergoing 51 thermal shock cycles between 1100 °C and room temperature. Whereas, YSZ fiber composites burst immediately after only one thermal shock cycle under the same condition. In addition, the ZAT fiber composites also exhibit considerable mechanical and thermal insulating performance.
研究领域:
材料科学
·
热力学
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）