CATALYSIS LETTERS
·
2022
·Vol. 152
·期 12
·3843-3852
·
IF 2.936
Huang Xuehui,Yang Na,Li Xiaobo,Pan Hongyun,Song Xiaozhan,Chang Yu
La 0.8 Sr 0.2 MnO 3 (LSM) catalyst has been successfully prepared by solid phase method (G-LSM-T), sol–gel method (C-LSM-T) and molten salt method (S-LSM-T), using as-prepared MnCO 3 microspheres as templates, respectively. It was shown that the S-LSM-550 catalyst presented well-formed perovskite structures, large specific surface area (49.65m 2 /g) and promising catalytic activity in CO oxidation, which T 50 and T 90 for CO conversion over fresh S-LSM-550 were 145.14 °C and 170.73 °C. The S-LSM-550 calcined at 550 °C for 2 h exhibited excellent thermal stability and catalytic activity compared with the samples prepared by solid phase method and sol–gel method. Its superior catalytic performance could be greatly attributed to its stable microstructure, high surface Mn 4+ /Mn 3+ molar ratio and more available surface adsorbed oxygen species. Graphical Abstract
研究领域:
材料科学
·
催化化学
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DOI
高影响因子
APPLIED PHYSICS A-MATERIALS SCIENCE & PROCESSING
·
2024
·Vol. 130
·期 8
·1-13
·
IF 2.5
Xie Zhuojia,Xu Changji,Jiang Xinyu,Zhang Weijian,Feng Min,Zhong Shenglin,Zou Zhengguang
With the growing attention to perovskite materials in the field of magnetic refrigeration. In this work, La 0.8−x Pr x Sr 0.2 MnO 3 (x = 0.05, 0.10, 0.15) (LPSMO) samples were synthesized through the sol–gel method. The effects of Pr 3 ⁺ doping on the structure, morphology, and magnetization of LPSMO were investigated. The XRD analysis revealed that the LPSMO samples have a rhombohedral structure within the R-3c space group. As the amount of Pr 3 ⁺ doping increased, the cell volume decreased. The magnetic properties of LPSMO exhibited a transition from ferromagnetic (FM) to paramagnetic (PM) near the Curie temperature (Tc), with Tc decreasing as the Pr 3 ⁺ doping level increased. The second-order magnetic phase transition of LPSMO near Tc was confirmed by employing the MPMS. The maximum magnetic entropy change ( \(-\Delta {S}_{M}^{max}\) ) of LPSMO is 4.92 J/(kg·K) (x = 0.05), 5.13 J/(kg·K) (x = 0.10) and 5.04 J/(kg·K) (x = 0.15) when the external magnetic field (H) = 5 T, separately. Meanwhile, the relative cooling power ( RCP ) of LPSMO are 283.88, 276.71, and 289.60 J·kg −1 , respectively. The experiments indicate that LPSMO has promising application prospects.
研究领域:
材料科学
·
磁制冷技术
✓ 已验证
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DOI
高影响因子
SENSORS AND ACTUATORS B-CHEMICAL
·
2021
·
IF 7.46
Chu Cheng,Jie Zou,Yucun Zhou,Zi Wang,Han Jin,Guangzhong Xie,Jiawen Jian
A mixed potential type alcohols gas sensor based on an yttrium stabilized zirconia (YSZ) electrolyte and an La 0.8 Sr 0.2 MnO 3 (LSM) sensing electrode was fabricated. The influences of YSZ-LSM interface on sensing performance were studied by multiple methods including X-ray diffraction (XRD), scanning electron microscope (SEM), energy dispersive spectroscopy (EDS), thermogravimetric analysis and differential scanning calorimetry (TG-DSC) and electrochemical impendence spectroscopy (EIS). The sensor with 1150 °C-sintered interface showed an ultralow detection limit of 50 ppb alcohols (methanol and ethanol) at 500 °C in air. The response voltage was independent of water, CO, CO 2 and NO x . The sensor exhibited a reasonable selectivity towards alcohols under the existence of several kinds of volatile organic compounds. Meanwhile, the sensor showed a good repeatability and a suitable long-term stability. Based on the polarization curves and EIS results, a mixed potential mechanism was proposed. These results demonstrate the promising potential of using the LSM-based sensor for human exhale test.
研究领域:
材料科学
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电化学
✓ 已验证
DOI
高影响因子
CERAMICS INTERNATIONAL
·
2023
·
IF 5.2
Weichao Wang,Gu Liu,Liuying Wang,Chaoqun Ge,Long Wang,Bin Wang,Jie Huang
The advancement of absorption materials and coating preparation technology is crucial to address the challenges posed by electromagnetic interference and pollution in high-temperature extreme environments. Here, by using a granulation and plasma spraying strategy, we successfully fabricated a series of La 0.8 Sr 0.2 MnO 3 /Al 2 O 3 –13%TiO 2 (LSMO/AT13) high-temperature microwave absorption coatings that have excellent dielectric properties and extremely thermal stability. The results showed that the LSMO/AT13 coatings exhibited remarkable oxidation resistance , withstanding high-temperature aerobic environments of up to 1000 °C. Based on the temperature-dependent permittivity of the coatings, the establishment process of polarization and the transformation of loss mechanism were observed and explained. With the increase of temperature, the main dielectric loss mechanism of the coatings transitions from polarization loss to conductive loss. Thanks to the coordinated effects of impedance and loss, the coatings are capable of effectively absorbing microwave over a wide temperature range. When the LSMO content was 30 wt% and the thickness was 1.9 mm, the effective bandwidth ranged from 1.7 GHz to 2.4 GHz at temperatures below 773 K. This study demonstrates the promising application of LSMO/AT13 microwave absorption coatings for ultra-high temperature environment, and provides a reference for the design and optimization of high-temperature microwave absorption coatings.
研究领域:
材料科学
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电磁学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
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2022
·Vol. 33
·期 13
·9830-9844
·
IF 2.779
Liu Gu,Wang Weichao,Wang Liuying,Ge Chaoqun,Wang Wenhao,Wang Long,Xu Kejun,Chen Mengzhou
La 0.8 Sr 0.2 MnO 3 (LSMO) powder was prepared using the sol–gel method and treated at different annealing temperatures ( AT ), and the effects of AT on the crystal structure, oxygen vacancies, magnetic, electromagnetic, and microwave absorption properties of LSMO were investigated. Our results showed that with increased AT , the lattice constant and average grain size increased while the density of oxygen vacancies gradually decreased. The bond angle of Mn–O–Mn and saturation magnetization also increased gradually when AT ≤ 1373 K, and decreased slightly when AT = 1473 K. The increase of mole ratio of Mn 4+ and grain size growth also contributed to the significant improvement in electrical conductivity of LSMO, while the decreases polarization of the material weakened its dielectric properties. When the frequency range was 2–18 GHz, and AT = 1173 K, LSMO exhibited the maximum effective bandwidth, which was 4.7 GHz (13.1–17.8 GHz) when the thickness was 1.62 mm. A minimum reflection loss ( RL ) of − 21.4 dB was reached at 15.8 GHz. Furthermore, when T = 973 K, LSMO exhibited excellent low-frequency absorption properties. When the thickness was 2.2 mm, the effective bandwidth in the X-band was 3.2 GHz (8.65–11.85 GHz) and RL was − 46.3 dB at 10.4 GHz. This indicated that the annealing temperature was the key parameter for determine the effective working frequency band of LSMO. As a result, this work provides a reference for regulating the electromagnetic properties of LSMO, which is necessary to meet the microwave absorption requirements in different occasions.
研究领域:
材料科学
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物理学
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DOI
高影响因子
CHINESE JOURNAL OF PHYSICS
·
2024
·
IF 4.6
Zhuojia Xie,Zhengguang Zou,Changji Xu,Shenglin Zhong,Min Feng,Xinyu Jiang,Weijian Zhang,Xiuxin Zheng,Wenbin He
We prepared La 0.8- x K x Sr 0.2 Mn 0.95 Co 0.05 O 3 (0 ⩽ x ⩽ 0.1) (LKSMCO) through the modified sol-gel method (S-G) and its structure. Then, the magnetic, magnetocaloric, and critical behavior were analyzed. LKSMCO was confirmed to be the rhombohedral structure within the R-3c space group (No.167) using transmission electron microscopy and X-ray diffraction. For validating the chemical composition of LKSMCO, X-ray photoelectron spectroscopy and EDS were applied, showing that K + was successfully doped. Phase transition of LKSMCO from paramagnetic to ferromagnetic phase near Curie temperature (Tc) was confirmed with a Magnetic Property Measurement System (MPMS). Using normalization and Banerjee's criterion, LKSMCO was demonstrated to be the second-order magnetic phase transition (SOMPT). As shown from the applied magnetic field, the maximal magnetic entropy ( − Δ S M m a x ) of LKSMCO near Tc was 3.87 J/(kg K) ( x = 0.00), 4.28 J/(kg K) ( x = 0.05) and 4.44 J/(kg K) ( x = 0.10). We employed the Kouvel-Fisher approach (KF) and modified Arrott plots to confirm the values of γ, δ , and β . This indicates that critical exponents of LKSMCO were consistent with the Mean-filed model.
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
CHINESE JOURNAL OF CATALYSIS
·
2014
·
IF 1.552
Li Meng,Fangzhong Wang,Ao Wang,Jian Pu,Bo Chi,Jian Li
La 0.8 Sr 0.2 MnO 3 (LSM)-coated Ba 0.5 Sr 0.5 Co 0.8 Fe 0.2 O 3 (BSCF) composite powder (LSM-BSCF) was synthesized by a novel solid-solution method and investigated electrochemically as a cathode material for intermediate temperature solid oxide fuel cells. The cathode combined the merits of LSM and BSCF cathodes through an extended triple phase boundary and stabilized microstructure and demonstrated a polarization resistance between 0.61 and 0.09 Ω cm 2 at 600 to 750 °C. Compared with high performance cathodes prepared by solution impregnation, this LSM-BSCF cathode greatly improved performance stability.
研究领域:
材料科学
·
能源工程
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DOI
高影响因子
JOURNAL OF RARE EARTHS
·
2024
·
IF 5.2
Rui Shi,Yan’an Li,Jiutao Gao,Ziyang Chen,Xin Zhang,Shanlin Zhang,Zaheer Ud Din Babar,Chengxin Li
This study focused on meeting the stringent stability requirements of tubular segmented-in-series solid oxide fuel cells (SOFCs) in reducing and oxidizing atmospheres. To address this challenge, a bi-layer perovskite ceramic interconnect was designed by controlling the oxygen partial pressure, because of the strong correlation between the conductivity of strontium-doped lanthanum titanate (LST) and the oxygen partial pressure. The LST powder was prepared using solid-phase and sol-gel methods, and their influence on particle size and sintering behavior was compared. LST/lanthanum strontium manganite (LSM) bi-layer ceramic interconnects with varying thicknesses were fabricated through screen printing and co-sintering. The results demonstrate favorable interfacial bonding and excellent chemical compatibility between the ceramic layers. The conductivity of the bi-layer interconnect exhibits a temperature-dependent behavior, peaking at 550 °C. Simulation calculations and research findings validate that the conductivity of the bi-layer interconnect is determined by the thickness of the LSM layer and the oxygen partial pressure at the interconnect interface. Optimal conductivity is achieved with a bi-layer interconnect consisting of approximately 15 μm of LST and 4 μm of LSM. This can be attributed to the efficient regulation of oxygen partial pressure at the interface, effectively mitigating LSM decomposition caused by low oxygen partial pressure and the subsequent reduction in conductivity. These results provide valuable fundamental data and methodology for the development of high-performance interconnects for tubular segmented-in-series SOFCs.
研究领域:
材料科学
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能源工程
·
陶瓷材料
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产品关联
DOI
高影响因子
SENSORS AND ACTUATORS B-CHEMICAL
·
2023
·
IF 8.4
Xianwei Qian,Jie Zou,Xiaoqing Jiang,Xuebin Li,Liang Shan,Guangzhong Xie,Jiawen Jian
La 0.8 Sr 0.2 MnO 3 (LSMn) was prepared as a sensing electrode (SE) for mixed-potential type NO 2 sensors, and the effects of porous micromorphology on sensing performance were studied. The results showed that the grain size of La 0.8 Sr 0.2 MnO 3 and the pore size of the SEs were regulated by sintering time . The sensitivity of the sensors increased and then decreased as the pore size increased. Selectivity was optimized via the sintering time. Finally, a NO 2 sensor with SEs sintered at 1100 °C for 2 h showed commercially viable performance at 550 °C. These results indicate that the regulation of porous LSMn SE by sintering time could be applied in mixed-potential type NO 2 sensors and is therefore a candidate for the monitoring of high-temperature exhaust.
研究领域:
材料科学
·
环境监测
·
传感器技术
✓ 已验证
产品关联
DOI
高影响因子
APPLIED ENERGY
·
2019
·
IF 8.426
Rong-hua Yuan,Yun He,Wei He,Meng Ni,Michael K.H. Leung
The development of efficient noble-metal free electrocatalysts for oxygen reduction reaction (ORR) and oxygen evolution reaction (OER) is of great importance for energy storage devices, such as fuel cell and zinc-air battery. In this work, we report a facile approach to enhance the electrocatalytic activity of La 0.8 Sr 0.2 MnO 3 -based perovskite by introducing the deficiency in the A-site and transition-metal Fe in the B-site. Bifunctional electrocatalysts La 0.8 Sr 0.2 MnO 3 , (La 0.8 Sr 0.2 ) 0.98 MnO 3 , (La 0.8 Sr 0.2 ) 0.95 MnO 3 and (La 0.8 Sr 0.2 ) 0.95 Mn 0.5 Fe 0.5 O 3 were prepared by a facile sol–gel process. The material characterization results showed that compared with La 0.8 Sr 0.2 MnO 3 , (La 0.8 Sr 0.2 ) 0.98 MnO 3 and (La 0.8 Sr 0.2 ) 0.95 MnO 3 have smaller particle size, more oxygen vacancies and proper Mn valence, which will benefit both ORR and OER. The results were verified by testing the electrocatalytic activities using rotating-disk electrode (RDE) in alkaline media. For the perovskite oxides with only A-site cation deficiency, the bifunctional electrocatalytic activities increase in the following order: La 0.8 Sr 0.2 MnO 3 < (La 0.8 Sr 0.2 ) 0.98 MnO 3 < (La 0.8 Sr 0.2 ) 0.95 MnO 3 . With partial substitution of Mn by Fe in the B-site, the (La 0.8 Sr 0.2 ) 0.95 Mn 0.5 Fe 0.5 O 3 perovskite oxide exhibits even better electrocatalytic activity. Further experiments reveal that (La 0.8 Sr 0.2 ) 0.95 Mn 0.5 Fe 0.5 O 3 has the highest current density (4.5 mA cm −2 ) in ORR which is comparable to commercial Pt/C (5 mA cm −2 ) and the enhancement of the OER is more obvious than that of the ORR. Subsequently, the perovskite samples were used as the cathode catalysts in zinc-air batteries. The results further prove that proper use of A-site deficiency and B-site Fe doping in perovskite oxides can boost up the electrocatalytic activities.
研究领域:
材料科学
·
电化学
✓ 已验证
产品关联
DOI
高影响因子
ADVANCED POWDER TECHNOLOGY
·
2026
·Vol. 37
·期 9
·105406
·
IF 4.5
Hao Yang,Xuemei Deng,Changchun Yu,Zifeng Li,Xuting Sun,Hui Zhang,Qingming Chen,Yule Li
A series of La 0.8 Sr 0.2 Mn 1- x Fe x O 3 ( x = 0–0.03) ceramic materials were synthesized via the sol–gel method, and their structural, electrical, and magnetic properties were systematically investigated. Rietveld refinement of X-ray diffraction (XRD) patterns reveals that all LSMFO ceramics crystallize in a rhombohedral perovskite structure (space group: R 3 ¯ c ). Scanning electron microscopy (SEM) analysis demonstrates that appropriate Fe doping ( x = 0.01) can promote grain growth. With the increase of Fe doping content, both the temperature coefficient of resistance (TCR) and magnetoresistance (MR) of LSMFO samples exhibit a trend of first increasing and then decreasing. For the sample with x = 0.005, the TCR and MR reach their maximum (TCR peak and MR peak ) values: 6.48%·K −1 (peak TCR temperature T k = 301.48 K) and 27.06% (peak MR temperature T m = 304.21 K), respectively, with both corresponding temperatures close to room temperature. The optimization of electrical and magnetic properties of LSMFO samples is attributed to the improvement of grain boundary density and grain size by Fe doping. In summary, these results demonstrate that LSMFO ceramics hold broad application prospects in fields such as uncooled infrared bolometers and magnetic sensors.
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高影响因子
JOURNAL OF SOL-GEL SCIENCE AND TECHNOLOGY
·
2025
·
IF 3.2
Xie Zhuojia,Feng Min,Zou Zhengguang,Xu Changji,Zhong Shenglin
La 0.8- x Eu x Sr 0.2 MnO 3 (LESMO) ( x = 0.05, 0.10, 0.15) samples were synthesized by the sol-gel (S-G) method. The effect of Eu 3+ doping at the A-site on the microstructure, morphological, and magnetocaloric effect (MCE) of LESMO was investigated. XRD revealed that the LESMO samples had a rhombohedral structure within the R-3c space group. The cell volume ( V ) decreased with increasing Eu 3+ doping. The magnetic properties of LESMO revealed a ferromagnetic-paramagnetic transition around the Curie temperature (T C ) with an increase in the Eu 3+ doping level. Using Banerjee’s criterion and utilizing normalization, it was confirmed that a second order magnetic phase transition (SOMPT) occurs in LESMO near T C . The maximum magnetic entropy change \((-\Delta {S}_{M}^{M{ax}})\) of LESMO ( x = 0.05, 0.10, and 0.15) was 5.22 J/(kg·K), 4.68 J/(kg·K), and 3.55 J/(kg·K), respectively, under an external magnetic field (H). The relative cooling power ( RCP ) of LESMO was 285.01 J·kg −1 ( x = 0.05), 289.60 J·kg −1 ( x = 0.10), and 300.15 J·kg −1 ( x = 0.15). La 0.65 Eu 0.15 Sr 0.2 MnO 3 exhibits a higher maximum RCP of 300.15 J·kg −1 , equal to 73.2% of that of Gd. Graphical
研究领域:
材料科学
·
物理学
✓ 已验证
DOI
高影响因子
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