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
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APPLIED PHYSICS A-MATERIALS SCIENCE & PROCESSING
·
2024
·Vol. 130
·期 8
·1-13
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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.
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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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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.
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JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
·
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.
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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.
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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
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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.
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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.
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ELECTROCHIMICA ACTA
·
2026
·
IF 5.8
Fangjie Liu,Shuai Zhang,Haizhao Li,Lele Guo,Shilong Wei,Qingjie Wang,Yihui Liu
Concentrations of oxygen-vacancy are increased by Co doping in LSM. • Conductive behavior evolution is induced by Co from electronic conductor to MIEC. • Oxygen exchange and charge-transfer processes are synergistically accelerated. • A current density of −0.37 A cm -2 is achieved in an electrolyte-supported SOEC. La 0.8 Sr 0.2 MnO 3 (LSM) oxygen electrodes show sluggish oxygen evolution reaction (OER) kinetics for the limited reaction zones at triple-phase boundaries (TPBs) caused by the pure electronic conductor of LSM. Modulating the conduction mechanism of LSM by Co-doping is one effective by tailoring the physicochemical properties. Effects of Co doping on oxygen-vacancy formation, conduction behavior and electrochemical kinetics are systematically investigated. Co doping increases the oxygen-vacancy concentration and promotes the evolution of conduction mechanism, thereby enhancing oxygen surface exchange and charge-transfer kinetics. DFT calculations further demonstrate that the reduced oxygen-vacancy formation energy and electronic-structure modulation induced by Co doping drive the conduction-mechanism evolution. La 0.8 Sr 0.2 Co 0.2 Mn 0.8 O 3 based single cell delivers a current density of -0.37 A·cm -2 at 1.6 V, representing a 105% enhancement compared to that with pure LSM. This work opens up new avenues improving OER activity of oxides for other applications through rational design of conductive mechanism. Download: Download high-res image (207KB) Download: Download full-size image
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JOURNAL OF CATALYSIS
·
2025
·
IF 6.5
Bin Zhu,Xin He,Lingze Liu,Jinglin Liu,Xiaomin Zhang,Ben W.-L. Jang
Perovskite is one of the most promising materials for catalytic oxidation of volatile organic compounds (VOCs) because of its special tunable structure and properties as well as high stability. However, it commonly suffers from relatively low catalytic activity due to the low specific surface area and limited numbers of active sites caused by high synthesis temperature required. To improve the reactivity of the perovskite catalyst, a promising strategy is to construct highly dispersed noble metal sites on surfaces perovskite. However, generating highly active metallic sites while exhibiting good thermal stability remains a formidable challenge. Here, it’s demonstrated that the construction of highly efficient and robust platinum (Pt) sites on La 0.8 Sr 0.2 MnO 3-δ (Pt/LSMO) for toluene oxidation resulted in an almost three-fold increase in toluene conversion with a good stability. The key to the construction of these Pt sites is treating the oxidized Pt species on LSMO with hydrogen (H 2 ) plasma at low temperatures, which leads to the formation of high metallic Pt (Pt 0 ), ultrasmall Pt nanoparticles (∼1.3 nm), and high concentration of oxygen vacancy (O v ). These features facilitate the generation of a large number of highly active and stable Pt 0 -Mn 3+ -O v sites on Pt/LSMO, which contribute to the activation of toluene and oxygen species and, therefore, the catalytic reaction. This investigation demonstrates a promising approach of using the cold plasma technique to design and construct high-performing noble-based perovskite catalysts for toluene oxidation.
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JOURNAL OF POWER SOURCES
·
2016
·
IF 6.333
Peng Qiu,Ao Wang,Jin Li,Zongbao Li,Lichao Jia,Bo Chi,Jian Pu,Jian Li
The solution impregnation technology was used to prepare a novel core-shell structure cathode for intermediate temperature solid oxide fuel cells (IT-SOFCs). The core was composed of porous Ba 0.5 Sr 0.5 Co 0.8 Fe 0.2 O 3−δ (BSCF) backbone with high oxygen conductivity, while the dense shell consisted of La 0.8 Sr 0.2 MnO 3−δ (LSM) high catalytic activity and the excellent CO 2 -poisoning resistance. The presence of the dense LSM shell prevented the BSCF cathode from being poisoned by CO 2 , and improved its electrochemical performance. The best performance was achieved when the BSCF cathode was impregnated twice in the LSM precursor solution and coated by LSM shell.
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