MATERIALS SCIENCE IN SEMICONDUCTOR PROCESSING
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2022
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IF 4.644
Yihang Dong,Xiaoming Sun,Anran Mu,Zhaoyang Liu,Guoxing Qiu,Xiaofang Zhang,Ye Han,Jianxu Ding,Xiangnan Wang
In this manuscript, (8YSZ) 1- x (CeO 2 ) x (0 ≤ x ≤ 0.6), belonging to the cubic fluorite structure, was prepared by a co-precipitation method. We highlighted the effect of a dense diffusion barrier conductivity on the sensing performance by choosing the lowest conductivity of (8YSZ) 0.4 (CeO 2 ) 0.6 as a dense diffusion barrier compared with the highest conductivity of (8YSZ) 0.9 (CeO 2 ) 0.1 published. A sensor was fabricated using bonding Pt paste. Limiting current ( I L ) platforms were obtained at different oxygen concentrations x (O 2 ) in a temperature range of 720–900 °C. The oxygen sensor had a smaller oxygen measurement range of 0–10% at 850 °C compared to (8YSZ) 0.9 (CeO 2 ) 0.1 as a diffusion layer . These results showed that the higher oxide ion conductivity of the diffusion layer can achieve a wider oxygen measurement range, which can guide the search for new mixed conductor with higher oxide ion conductivity. The sensing performance of the oxygen sensor was not influenced by p (H 2 O) and x (CO 2 ), which showed the sensor had a strong selectivity towards oxygen. Furthermore, the limiting current of the sensor remained stable during 144 h of detection.
研究领域:
材料科学
·
化学工程
✓ 已验证
产品关联
DOI
高影响因子
INORGANIC CHEMISTRY
·
2022
·
IF 5.436
Jiachen Li,Li Yang,Jungu Xu,Alberto J. Fernández-Carrión,Xiaojun Kuang
The La2O3/SrO/Ga2O3 ternary system contains several compounds with remarkable oxide or proton ionic conduction. Among them, the layered LaSr2(GaO4)O compound is a less commonly studied material. Here, the crystal structure, electrical conduction properties, and ionic migration mechanism of the La1–xSr2+x(GaO4) O1–0.5x (0 ≤ x ≤ 0.3) system are thoroughly analyzed. Diffraction methods indicate that the system crystallizes in the tetragonal space group P4/ncc, which is compatible with the presence of a subtle GaO4 tetrahedral tilting along the c axis, leading to a slight deviation of the body-centered tetragonal structure previously reported. This feature is essential to further understanding the mixed p electronic/oxide ion-conducting behavior of the system. Upon La3+ for Sr2+ substitution, oxygen vacancies arise at the loosely bound oxide sublattice, which at high temperature go through the GaO4 tetrahedral layer, leading to the formation of intermediate corner-sharing Ga2O7 tetrahedral dimers, and migrate via the continuous breaking and re-formation of the dimers, assisted by the synergic rotation and deformation of neighboring GaO4 tetrahedra. The unique structural and electrical features of La1–xSr2+x(GaO4)O1–0.5x materials within the La2O3/SrO/Ga2O3 ternary system emphasize their potential application as cathode materials in LaGaO3-based fuel cells.
研究领域:
材料科学
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电化学
✓ 已验证
DOI
高影响因子
Applied Materials Today
·
2022
·
IF 8.663
Yun Zhao,Jianhua Yan,Jianyong Yu,Bin Ding
Li-metal batteries are promising candidates for next generation rechargeable batteries. However, the hazards caused by the growth of Li-dendrite and enormous volume fluctuations during cycling hinder its practical applications. Here, to solve these problems, a flexible mixed ion-electron conducting fabric scaffold is constructed by uniformly incorporating Li 0.33 La 0.56 TiO 3 nanoparticles into a 3D carbon nanofiber skeleton. The mixed conductor fabric cannot only homogenize the distribution of electric filed and alleviate volume changes, but also can accelerate the migration and distribution of Li + , thus achieving uniform Li plating/stripping behavior by balanced ion/electron transport. Consequently, the obtained stable and dendrite-free Li-metal anode has a notable cycling stability and rate performance. This work provides a promising direction for the design of practical composite Li-metal anodes.
研究领域:
材料科学
·
能源存储技术
✓ 已验证
产品关联
DOI
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
·
2023
·
IF 8.6
Jing Gao,Yong Li,Huimin Li,Tianxiang Chen,Huasheng Xiao,Xinzhi Chen
An effective symmetric structured dual phase mixed conducting oxygen separation membrane made of 60 wt% Ce 0.9 Gd 0.1 O 2-δ − 40 wt% Ba 0.5 Sr 0.5 Co 0.8 Fe 0.2 O 3-δ (60CGO-40BSCF) were prepared by the aqueous tape casting. The symmetric ceramic membranes consisted of a dense thin layer with a thickness of around 50 µm in the middle, and two porous substrates (around 290 µm thick) located on the two sides of the middle thin dense layer. In this case, both the bulk diffusion of oxygen ion and surface gas exchange are simultaneously optimized to enlarge the oxygen permeation flux. In addition, a symmetric structure favors to stabilize the ceramic membrane. Compared with monotonous dense membrane, the porous supported symmetric membrane delivered higher permeation fluxes, e.g., 3.78 ml cm −2 min −1 at 975 °C under an air/He gradient, while an oxygen permeation flux of 1.42 ml cm −2 min −1 was obtained for the monotonous dense membrane. As increasing the O 2 partial pressure in the feed side to 0.8 atm, an oxygen permeation flux of 8.67 ml cm −2 min −1 was obtained. The current study implies that the porous supported symmetric membrane structure is an efficient strategy to enhance the oxygen permeation flux.
研究领域:
材料科学
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陶瓷工程
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化学工程
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膜技术
✓ 已验证
产品关联
DOI
高影响因子
International Journal of Precision Engineering and Manufacturing-Green Technology
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2023
·Vol. 11
·期 2
·449-461
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IF 4.2
Yang Xinlei,Yang Fan,Afzal Muhammad,Sun Wanli,Kim Jung-Sik
La/Pr co-doped ceria (LCP) is processed to fabricate low-temperature ceramic fuel cell based on industrial-grade rare-earth carbonate electrolyte that is reached above a maximum power density of 750 mW/cm 2 at 520 °C. The charge carriers are investigated through LCP fuel cell having symmetric NCAL (Ni 0.8 Co 0.15 Al 0.05 LiO 2-δ ) electrodes using proton conductor BCZY (BaCe 0.7 Zr 0.1 Y 0.2 O 3-δ ) as a blocking layer and are found protons that dominate during the cell operation. The results of associated characterizations for HCC (hydrogen concentration cell) and the OCC (oxygen concentration cell) reveal that LCP material is mixed conductor of both protons and oxygen ions simultaneously. Transmission electron microscopy (TEM), X-ray Photoelectron Spectroscopy (XPS) and Fourier-transform infrared spectroscopy (FTIR) analysis before and after the electrochemical testing of the cell are performed which show an amorphous layer of LiOH/Li 2 CO 3 mixture that is formed after the tests on the surface of LCP structure. Conceptually, it looks that LiOH/Li 2 CO 3 mixture in molten state in the interface region of two-phase material promotes the proton conduction through LCP electrolyte, with negligible oxygen ion conduction.
研究领域:
能源材料
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固态电化学
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燃料电池
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材料科学
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纳米技术
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无机化学
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）