JOURNAL OF THE ELECTROCHEMICAL SOCIETY
·
2024
·Vol. 171
·期 7
·077514
·
IF 3.1
Tengteng Zhao,Chaoyu Wang,Lei Dai,Weiwei Meng,Yongguang Liu,Yuehua Li,Ling Wang
NO2 is an important pollutant of automobile engines and industrial fuels, making it important to quantitatively monitor and control. An amperometric-type NO2 gas sensor was fabricated using yttria-stabilized zirconia (YSZ) electrolyte with a bi-layered structure and La0.7Sr0.3MnO3−δ-xNiO (LSMO-xNiO, x = 0–0.75) composite sensing electrode (SE) prepared by impregnation method in combination with self-demixing. The samples were characterized using SEM, XRD, and XPS, and their performance as sensors was tested. LSMO-xNiO composite SE particles were formed by de-mixing in the process of treating the precursor at high temperatures and are uniformly dispersed in the YSZ porous backbone. With the increase of NiO content, the SE particles become significantly large. At 450 °C–600 °C, the response currents at a fixed potential have a linear relationship with the NO2 concentrations at 25–700 ppm. Combining stability and sensitivity, the voltage was fixed to −0.25 V. The introduction of NiO into the LSMO sensing electrode effectively improves the performance of the sensor. The sensor based on LSMO-0.5NiO has the highest sensitivity (0.0405 μA/ppm) at 550 °C. Simultaneously, the sensor exhibits good anti-interference ability for CH4, CO2, O2, and NO, but has obvious cross-sensitivity to H2 and NH3. In addition, the response current of the sensor change with the increase of RH.
研究领域:
材料科学
·
环境监测
·
传感器技术
✓ 已验证
DOI
高影响因子
RSC Advances
·
2017
·Vol. 7
·期 78
·49446-49454
·
IF 3.108
Pan Yue,Zhi-Xian Wei,Xu-Hong Wu,He-Dan Zhang,Fan Ye
In order to identify a high-efficiency solar-light-driven magnetic photocatalyst, a series of powders such as perovskite La0.7Sr0.3MnO3, yeast-assisted La0.7Sr0.3MnO3 (Y-La0.7Sr0.3MnO3), Y-La0.7Sr0.3MnO3/TiO2 and TiO2 were prepared and characterized by photoluminescence spectroscopy (PL), UV-Vis diffuse reflectance spectroscopy (DRS), X-ray diffraction (XRD), transmission electron microscopy (TEM), X-ray photoelectron spectroscopy (XPS) and N2 adsorption–desorption (N2-BET). The magnetic and photocatalytic properties of the powders were also investigated. The experimental results show that, when the content of TiO2 in the composite Y-La0.7Sr0.3MnO3/TiO2 is 3.51 wt%, the Y-La0.7Sr0.3MnO3/TiO2 exhibits stronger absorption in the UV-Vis light region. A composite p–n heterojunction was formed and had the lowest photoluminescence (PL) intensity, indicating a higher separation efficiency of photogenerated charge carriers and an enhancement of the photocatalytic activity of the Y-La0.7Sr0.3MnO3/TiO2 composite. Under solar irradiation, Y-La0.7Sr0.3MnO3/TiO2 shows an obvious synergistic photocatalytic effect on orange (MO) wastewater, and the synergetic index is calculated to be 1.79. Furthermore, it still exhibits high photocatalytic activity after being reused 8 times. Moreover, Y-La0.7Sr0.3MnO3/TiO2 displays soft ferromagnetic behavior, has much higher magnetization and lower coercivity and remanence. Therefore, Y-La0.7Sr0.3MnO3/TiO2 can be recycled by an external magnetic field more easily and can be used repeatedly. Radical trapping experiments confirmed that the main reactive oxygen species (ROS) involved in the process of the photocatalytic reaction are the superoxide radical anion (˙O2−), hole (h+), and hydroxyl radical (˙OH), and the sequence of the contributions of the ROS to the photocatalytic activity of the composite is ˙O2− > h+ > ˙OH. Furthermore, the photocatalytic mechanism of Y-La0.7Sr0.3MnO3/TiO2 is proposed in this work.
研究领域:
材料科学
·
环境科学
✓ 已验证
产品关联
DOI
高影响因子
SENSORS AND ACTUATORS B-CHEMICAL
·
2017
·
IF 5.401
Zaihua Duan,Min Xu,Tingshuai Li,Yong Zhang,Hefeng Zou
La 0.7 Sr 0.3 MnO 3 (LSMO) nanocrystals were prepared by polyvinylpyrrolidone (PVP)-assisted sol-gel method and characterized by a variety of characterization techniques. The humidity sensor based on LSMO nanocrystals was fabricated and its humidity sensing properties were investigated at room temperature (25 °C) within the relative humidity (RH) range of 11–95%. The optimum working frequency of the LSMO humidity sensor was 10 Hz and the impedance variation was about four orders of magnitude within the whole humidity range from 11% to 95% RH. The LSMO humidity sensor was of super-fast response speed, which was only about 0.8 s from 11% to 95% RH at 10 Hz. The super-fast response property may be ascribed to the strong hydrophilicity of LSMO nanocrystals. In addition, the LSMO humidity sensor was of good reproducibility, stability, small humidity hysteresis (4% RH at 75% RH) and a fast recovery speed (∼4.9 s). These results indicate the LSMO nanocrystals can be used as a novel humidity sensing material to fabricate high performances humidity sensors.
研究领域:
材料科学
·
传感器技术
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF MATERIALS SCIENCE
·
2021
·Vol. 56
·期 13
·7862-7878
·
IF 4.22
Cao Xue-Fang,Yue Pan,Wei Qiu-Rui,Dang Yun-Fei,Zhang Si-Qi,Wei Zhi-Xian,Wang Rong-Zhen
In this study, a solar-driven photocatalyst La 0.7 Sr 0.3 MnO 3 /α-Fe 2 O 3 (20%) with p – n heterojunction structure was synthesized and characterized. The magnetic, photocatalytic properties, Fenton-like action and the synergistic effect of the photocatalysis and Fenton-like on methyl orange (MO) degradation of La 0.7 Sr 0.3 MnO 3 /α-Fe 2 O 3 (20%) were also investigated. Results show that p – n heterojunction was formed, and it has considerable photocatalytic properties under ultraviolet light and solar irradiation. More importantly, La 0.7 Sr 0.3 MnO 3 /α-Fe 2 O 3 (20%) also exhibits Fenton-like catalytic performance in the presence of H 2 O 2 and oxalic acid (OA). The main reactive radicals of the La 0.7 Sr 0.3 MnO 3 /α-Fe 2 O 3 –H 2 O 2 –OA–sunlight system are h + , · OH and · O 2 − . The chemical oxygen demand removal rate of MO wastewater in La 0.7 Sr 0.3 MnO 3 /α-Fe 2 O 3 (20%)–H 2 O 2 –oxalic acid–sunlight system reached 72.4%; the value was higher than that of the sum of single photocatalysis (34.5%) and Fenton-like-dark system (27.6%), indicating that there is a synergistic effect between the photocatalysis and Fenton-like on MO degradation. In addition, La 0.7 Sr 0.3 MnO 3 /α-Fe 2 O 3 (20%) displays approximately superparamagnetism and has higher saturated magnetization ( M s ), low coercive force and residual magnetism. So it can be easily recovered by an external magnetic field and can be reused 6 times. It was anticipated that La 0.7 Sr 0.3 MnO 3 /α-Fe 2 O 3 (20%) with p – n heterojunction structure is a stable and reusable solar-light-driven magnetic photocatalyst and has great potential applications for wastewater treatment. Graphical abstract The magnetic La 0.7 Sr 0.3 MnO 3 /α-Fe 2 O 3 (20%) with p – n heterojunction structure was synthesized and characterized by different methods. The magnetic, photocatalytic properties, Fenton-like action and the synergistic effect of the photocatalysis and Fenton-like on methyl orange (MO) degradation of La 0.7 Sr 0.3 MnO 3 /α-Fe 2 O 3 (20%) were also investigated. It is not only a solar-driven photocatalyst with high efficiency, but also shows excellent Fenton-like catalytic effect. And the photocatalysis and Fenton-like system exhibited synergetic catalytic effect on MO degradation by La 0.7 Sr 0.3 MnO 3 /α-Fe 2 O 3 (20%). Furthermore, near superparamagnetic characteristics of the catalyst make it easy to recycle by the external magnetic field and can be reused for 6 times, suggesting that it is a stable multifunctional catalyst.
研究领域:
环境科学
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
ADVANCED FUNCTIONAL MATERIALS
·
2026
·
IF 19.9
Jie Tu,Hangren Li,Yuzhe Yang,Siyuan Du,Xiuqiao Liu,Xudong Liu,Longyuan Shi,Jianjun Tian,Linxing Zhang
Freestanding oxide ferroelectrics have attracted increasing attention due to their structural tunability, mechanical compatibility, and potential applications in next-generation nonvolatile ferroelectric semiconductor devices. Here, we achieved a gentle decomposition of La 0.7 Sr 0.3 MnO 3 (LSMO) sacrificial layer through an electrodynamic decomposition strategy, which can achieve rapid decomposition in weak acids, even in water that undergoes a small amount of hydrolysis reaction. The fastest decomposition time of LSMO is only 20 s, which is at least three orders of magnitude shorter than the time required for strong acid etching. The controllable decomposition time is within the range of 20 to 250 s by screening solution. Density functional theory calculations and electrodynamic decomposition curves jointly reveal the intrinsic chemical reasons for the ultrafast decomposition efficiency, specifically the adsorption energy and electric field effect. The procedure and results for fabricating high-integrity freestanding PbZrO 3 films using acetic acid and sodium chloride solutions have been demonstrated. This gentle electrodynamic decomposition strategy, integrating rapidity, low destructiveness, and various solutions compatibility, paves the way for further exploring the application potential of freestanding oxide materials in multifunctional semiconductor devices.
✓ 已验证
DOI
高影响因子
DALTON TRANSACTIONS
·
2019
·Vol. 48
·期 7
·2359-2366
·
IF 4.052
Sisi Dai,Bin Quan,Baoshan Zhang,Xiaohui Liang,Guangbin Ji
Incorporation of traditional perovskites into reduced graphene oxide (RGO) is an effective strategy to develop useful microwave absorbents. Taking advantage of the suitable impedance of La0.7Sr0.3MnO3 (LSMO), a novel and available microwave absorber was obtained. Here, we showed an outstanding and stable RGO material decorated with LSMO that can be used as an active component of microwave absorption devices. The as-prepared LSMO/RGO composites adopted the merits of RGO and LSMO and provided good properties, such as a controllable dissipation ability, optimized impedance matching, and broadened effective frequency bandwidth. For example, the minimum reflection loss (RL) value of LSMO/RGO composites with a 60% loading filler ratio reached −38.81 dB with a matching thickness of only 1.7 mm. Furthermore, the effective frequency bandwidth can be as wide as 5.64 GHz, with a thickness of 1.95 mm. Therefore, this work initiates a brand new avenue for artificial research of new materials for electromagnetic wave absorption.
研究领域:
材料科学
·
电磁学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF THE AMERICAN CERAMIC SOCIETY
·
2020
·Vol. 104
·期 2
·955-965
·
IF 3.502
Xian Zhang,YuYan Han,Xucai Kan,Min Wang,Rui Rao,Ganhong Zheng,Yongqing Ma
Polycrystalline La 0.7 Sr 0.3 MnO 3 sample (LSMO) was synthesized by the solid phase reaction; it exhibits the paramagnetic-ferromagnetic transition at T c = 362 K at the ambient pressure; it is paramagnetic metallic state above T c and the ferromagnetic metallic state below T c . It was observed that the pressure effect depends on the temperature range: (a) In the paramagnetic region, the magnetization M hardly changes with the pressure P , that is, Δ M ≈0. There exist the antiferromagnetic (AFM) coupled ferromagnetic clusters in the paramagnetic region, and the pressure enhances the AFM coupling. (b) In the temperature range around T c , the pressure increases M , that is, ΔM > 0, with the concomitant increase in T c ; the average pressure coefficient d T c /d P is 5.40 K/GPa at P = .74 GPa, much smaller than 15.47 and 15.90 K/GPa for La 0.7 Ca 0.3 MnO 3 and La 0.9 Ca 0.1 MnO 3 , respectively, due to the different distortion degree of MnO 6 octahedra in Ca and Sr doped manganites. (c) In the temperature region below T c , the pressure reduces M , that is, Δ M < 0. M is determined by the competition between the Mn 3+ -O-Mn 4+ double exchange and the interparticle dipolar interaction. The pressure enhances the interparticle dipolar interaction, leading to a significant decrease in magnetization. The resistivity of LSMO exhibits the metallic behavior in the temperature range of 5 K~370 K; it decreases as the applied magnetic field H increases from 0 to 7 T, that is, the magnetoresistance effect which is more significant around T c . The fitting to the low-temperature resistivity shows that the applied magnetic field reduces the scattering from the grain boundary, electron, phonon, and magnon, especially reduces the electron-electron scattering.
研究领域:
凝聚态物理
·
材料科学
·
磁学
·
强关联电子系统
✓ 已验证
DOI
高影响因子
FUEL PROCESSING TECHNOLOGY
·
2026
·
IF 7.8
Daikairui Zhang,Xianda Sun
Porous La 0.7 Sr 0.3 MnO 3 nanofibers are synthesized via facile electrospinning for DAFC cathodes. • The fuel cell reaches a peak power density of 40 mW cm -2 . • Half/full-cell durability tests confirm the good stability of La 0.7 Sr 0.3 MnO 3 nanofiber. Synthesizing anti-ammonia poisoning oxygen reduction reaction (ORR) electrocatalysts with low cost and high activity is pivotal for the development of high-performance direct ammonia fuel cells (DAFCs). ABO 3 -type perovskites are deemed as promising non-noble metal alternatives to noble-metal catalysts, thanks to their facile preparation, tunable structure and intrinsic ORR activity. Nevertheless, conventional ABO₃ perovskites synthesized via the sol-gel method are plagued by low specific surface area and severe particle agglomeration, which drastically suppress their practical ORR performance in DAFCs. Herein, one-dimensional (1D) La 0.7 Sr 0.3 MnO 3 nanofibers were fabricated via PVP-assisted electrospinning to overcome the bottlenecks of traditional perovskite catalysts. Results demonstrate that the half-wave potential (0.76 V) and limiting-current density (5.78 mA cm −2 ) of La 0.7 Sr 0.3 MnO 3 nanofibers are superior to those of the nanoparticle counterparts, which primarily benefits from its 1D porous structure enhancing the mass/electron transfer and exposing more active sites. The DAFC with a La 0.7 Sr 0.3 MnO 3 cathode yields a peak power density of 40 mW cm −2 , comparable to the DAFC using a Pt/C cathode. Moreover, the good stability of La 0.7 Sr 0.3 MnO 3 nanofibers has been experimentally verified by the half-cell and whole-cell durability tests. This work confirms that 1D porous La 0.7 Sr 0.3 MnO 3 nanofibers are a competitive non-noble-metal ORR catalyst, offering a feasible strategy for developing high-performance DAFCs.
✓ 已验证
产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）