CHEMICAL ENGINEERING JOURNAL
·
2021
·
IF 13.273
Hao Liu,Jianjun Chen,Ya Wang,Shangchao Xiong,Ziang Su,Yun Wang,Wenhao Yang,Xuefeng Chu,Weinan Yang,Yue Peng,Wenzhe Si,Junhua Li
A series of Sm-doped Co 3 O 4 catalysts for the N 2 O direct catalytic decomposition were synthesized by the sol–gel method using citric acid as a chelating agent and urea as a combustion agent. The doping of Sm significantly altered the activity of N 2 O decomposition on the Co 3 O 4 catalyst. Sm was incorporated into the Co 3 O 4 matrix, leading to the distortion of Co 3 O 4 lattice with the spinel configuration maintained. Sm-doping can effectively promote the oxygen vacancy generation, and the electron interaction between Co and Sm species occurred as the Co 3+ + Sm 2+ ↔ Co 2+ + Sm 3+ redox cycle. Combined with in situ Raman and in situ NAP-XPS results proposed that this redox cycle is the main reason that the Sm-doping accelerates the high-efficiency N 2 O decomposition.
研究领域:
催化
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材料科学
·
环境化学
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DOI
高影响因子
FUEL
·
2025
·
IF 7.5
Liangzheng Lin,Zhitao Han,Junhao Jing,Shoujun Zhang,Shaoqin Sheng,Sihan Yin,Tingjun Liu,Chuanqiu Gao
Manganese-based mullite-type oxides are widely used in VOCs oxidation, and their catalytic performance can be effectively regulated by modifying the A-site elements. Here, a series of Mn-based mullite catalysts (AMn 2 O 5 , A = Sm, Y, Gd) with different rare-earth elements at the A-site were synthesized via hydrothermal method and applied for methanol catalytic oxidation. The GdMn 2 O 5 catalyst demonstrated optimal low-temperature activity, achieving 98 % CH 3 OH conversion at 150 °C. Comprehensive characterization results revealed that the largest specific surface area (40.08 m 2 /g), highest Mn 4+ /Mn 3+ ratio (0.33), maximum O ads /O lat ratio (1.07), highest concentration of oxygen vacancy and enhanced surface oxygen mobility collectively contributed to the superior catalytic performance of GdMn 2 O 5 . In situ DRIFTS was employed to investigate the intermediate species and catalytic mechanism of GdMn 2 O 5 during methanol oxidation. This study provides an important theoretical basis for the rational design of AMn 2 O 5 catalysts and the catalytic oxidation of methanol by fully leveraging the rare earth cation effect, modification, and optimization.
研究领域:
催化化学
·
环境化学
·
材料科学
·
表面科学
·
无机化学
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产品关联
DOI
高影响因子
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
·
2019
·Vol. 30
·期 11
·10454-10464
·
IF 2.195
Yao Jiao,Ye Huihua,Wang Xusheng,Li Yanxia
The xMg 2+ /ySm 3+ ions co-doped CaTiO 3 :0.12Eu 3+ red phosphors were synthesized by solid-state reaction method and their structure, crystalline morphology, luminescent properties, decay curves and quantum efficiency were investigated in detail. The XRD patterns show these phosphors have an orthorhombic perovskite structure when the sintering temperature was 1350 °C. From photoluminescence spectra, two excitation peaks were observed located at 397 nm ( 7 F 0 → 5 L 6 ) and 465 nm ( 7 F 0 → 5 D 2 ), and there are two prominent red emission peaks around 595 nm ( 5 D 0 → 7 F 1 ) and 616 nm ( 5 D 0 → 7 F 2 ) corresponding to the magnetic dipole transition and electric dipole transition of Eu 3+ respectively. The luminescent properties were improved by adjusting Mg 2+ and Sm 3+ ions co-doping concentration and their optimal doping amount was found to be 7 mol% and 0.5 mol%. At this moment, their internal quantum efficiency was measured to be 52.4% and 47.5% respectively and decay times were 0.64 ms and 0.59 ms. According to concentration quench theory, the critical distance between activators in CaMTiO 3 :Eu 3+ (M = Mg, Sm) were 15.27 Å and 15.07 Å. CaTiO 3 :Eu 3+ phosphor’s thermal stability has been improved a lot due to Mg 2+ introduction. When temperature increases from 248 to 388 K, the red emission intensity of CaMg 0.07 TiO 3 :0.12Eu 3+ and CaMg 0.07 TiO 3 :0.12Eu 3+ ,0.005Sm 3+ phosphors have decayed only 12.1% and 15.9% respectively. These experimental results have indicated that the synthesized red phosphors can be used in solid state lighting devices.
研究领域:
材料科学
·
光学
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DOI
高影响因子
JOURNAL OF APPLIED PHYSICS
·
2016
·Vol. 119
·期 6
·
IF 2.101
Shi Xin Xin,Liu Xiao Qiang,Chen Xiang Ming
The evolution of structure, ferroelectric, and piezoelectric properties in Bi 1−x Sm x Fe 0.99 Ti 0.01 O 3 ceramics was extensively investigated within the entire morphotropic phase boundary region with 0 ≤ x ≤ 0.20. A sequential phase transition of R3c-Pna2 1 -Pbnm with increasing Sm content was revealed by Rietveld refinement of the X-ray diffraction data together with the macroscopic ferroelectric measurements. Both ferroelectric and piezoelectric properties showed a great enhancement in the vicinity of the R3c/Pna2 1 (polar-to-polar) phase boundary, which should be caused by the field-induced phase transition between these two phases. Such field-induced phase transition might be essentially accompanied by a change of magnetic state, which indicated a way of controlling magnetism by means of electric field.
研究领域:
材料科学
·
物理学
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DOI
高影响因子
SENSORS AND ACTUATORS B-CHEMICAL
·
2026
·
IF 8.3
Wenxue Wang,Gang Chen,Yitong Wang,Yunwei Li,Lijing Zhou,Ruiqin Gao,Guo-Dong Li
Developing highly sensitive, low detection limit, and stable formaldehyde (HCHO) sensors remains a key challenge in practical environmental health monitoring. LaFeO 3 -based sensors offer advantages such as good stability, sensitivity, and relatively low production costs. However, their response to HCHO need improvement to meet practical detection requirements. Herein, a series of Sm-doped LaFeO 3 perovskite oxides were prepared by a sol-gel method. Among these, 3 at% Sm-doped LaFeO 3 based sensor (3%Sm-LaFeO 3 ) exhibits the optimal response value (S = 115, 130 °C) to 40 ppm HCHO, along with a low detection limit (50 ppb), good selectivity, and long-term stability. Furthermore, 3%Sm-LaFeO 3 maintains reliable response (50 ppb, > 1.2) within a wide humidity range (≤ 70% RH), demonstrating its suitability for indoor HCHO detection. Density functional theory (DFT) calculations revealed two key mechanisms underlying the enhanced gas sensing performance by Sm doping. First, Sm enhances the adsorption of O 2 and promotes charge transfer, consequently increasing the amount of surface-adsorbed oxygen species. Second, Sm induces the d -band center of the local Fe 3d orbital to move upward, strengthening the bonds between the Fe 3d and the O 2p orbitals of HCHO, thereby improving HCHO adsorption. This study not only provides a highly sensitive and stable gas sensor for indoor HCHO monitoring, but also explains the dual roles of Sm species in the sensing process.
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产品关联
DOI
高影响因子
Journal of Advanced Dielectrics
·
2024
·
IF 2.1
Chunyang Zhao,Dashi Fu,Jinfeng Xu,Yalin Qin,Yongcheng Zhang
Ternary piezoelectric ceramics Pb(In 1 ∕ 2 Nb 1 ∕ 2 )O 3 –Pb(Mg 1 ∕ 3 Nb 2 ∕ 3 )O 3 –PbTiO 3 (PIN–PMN–PT) exhibit excellent temperature stability and hold great potential for high-frequency and high-power applications. However, its piezoelectric performance is much lower than that of the famous binary Pb(Mg 1 ∕ 3 Nb 2 ∕ 3 )O 3 –PbTiO 3 (PMN–PT) system. In this work, high-performance 15PIN–50PMN–35PT piezoceramics with piezoelectric coefficient d 3 3 of 700 pC/N, electromechanical coupling coefficient k p of 66% and high Curie temperature T C of 1 9 9 ∘ C were fabricated. Effect of Samarium (Sm) doping content on the ferroelectric, dielectric, electromechanical and piezoelectric properties and structures of 15PIN–50PMN–35PT piezoelectric ceramics were investigated, and results reveal that increasing the amount of Sm doping leads to a significant decrease of d 3 3 , k p , T C and other properties. This phenomenon is different from the previously reported results in Sm-doped binary PMN–PT ceramics. The room temperature and variable temperature phase structure and room temperature microstructure were studied to explain this phenomenon.
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DOI
高影响因子
ACS Applied Nano Materials
·
2021
·
IF 5.097
Ying Zheng,Mingqiang Cheng,Xinyan Wu,Shuang Zhang,Zhu Liu,Yanqiang Li,Weiquan Shao,Qing Lin,Jinshan Tan,Shouwu Gao,Yongcheng Zhang,Wanneng Ye
Mechanical energy can be directly transformed into chemical energy by piezoelectric materials, namely, piezocatalysis, which is a potential tactic for renewable clean energy collection and environmental purification. The piezocatalytic efficiency strongly relies on the piezoelectric property and free charge concentration of piezocatalysts. Here, four samarium-doped (1 – x)Pb(Mg1/3Nb2/3)O3-xPbTiO3 nanostructures were designed to investigate the correlation between the piezoelectric property and piezocatalytic performance. The diverse dye degradation efficiencies confirmed the high piezoelectric coefficient toward high catalytic activity. The degradation efficiency for acid orange 7 (AO7) was 100% within 20 min, while those for methyl orange (MO), methylene blue, and rhodamine B dyes were 97, 78, and 72%, respectively, within 40 min under ultrasonic vibration only. Furthermore, high catalytic efficiency of 96% was still maintained for AO7 degradation after 10 consecutive degradation cycles for samarium-doped 0.70Pb(Mg1/3Nb2/3)O3-0.30PbTiO3 due to its high piezoelectric coefficient. The investigation of the catalytic mechanism demonstrated that hole and superoxide radicals were the primary active species toward AO7 degradation, whereas hydroxyl and hole radicals were for MO degradation. This work not only demonstrates the highly efficient catalytic activity of samarium-doped (1 – x)Pb(Mg1/3Nb2/3)O3-xPbTiO3 nanostructures but also gives a deep comprehension of the correlation between the piezoelectric property and catalytic performance of piezocatalysts.
研究领域:
材料科学
·
环境催化
·
纳米材料
·
物理化学
·
能源材料
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DOI
高影响因子
CHEMICAL PAPERS
·
2024
·Vol. 78
·期 4
·2275-2285
·
IF 2.1
Shu Ronglu,Du Yifan,Cao Liping,Zhao Hui,Luo Xiaoying,Wang Wei
Cerium samarium oxides catalysts with K + doping on the wall surface of cordierite honeycomb ceramics were preparation by sol–gel and dipping processes. Scanning electron microscopy, energy dispersive X-ray spectroscopy, X-ray diffraction and Fourier transform-infrared spectroscopy were used to characterize the structural morphology and phase compositions. Through XPS analysis and H 2 -TPR measurement of monolithic catalyst, it is found that potassium ions improve the oxygen mobility in CeO 2 lattice and form surface active oxygen, increase the amount of oxygen adsorbed on the surface and improve the oxidation–reduction capacity. The catalytic combustion research demonstrates that T 10 , T 50 and T m in samples (Ce/Sm-0 K, Ce/Sm-0.3 K, Ce/Sm-0.5 K and Ce/Sm-0.7 K) decrease significantly compared with the blank reference (Cordierite). And the optimized sample Ce/Sm-0.5 K possess the lowest T 10 (389.6 °C), the lowest T 50 (425.5 °C), and the lowest T m (419 °C) in comparison with other samples. The cycle stability investigation reveals that sample Ce/Sm-0.5 K has excellent structural stability and stable catalytic performance, which has potential application in soot catalytic combustion field.
研究领域:
催化化学
·
材料科学
·
环境工程
·
化学工程
·
表面科学
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DOI
高影响因子
JOURNAL OF ELECTRONIC MATERIALS
·
2016
·Vol. 45
·期 6
·2974-2980
·
IF 1.491
Zheng Yuhui,Hu Jing,Deng Surong,Gao Jinwei,Wang Qianming
High-purity LuVO 4 : Ln 3+ /Bi 3+ (Ln = Eu, Sm, Dy) phosphors with tetragonal zircon structures were successfully synthesized. The reactions have been carried out by multiple irradiations with very high efficiency. Transmission electron microscope images showed that the phosphors had rod-like structures with average lengths of about 200 nm. The host absorption edge of LuVO 4 : Ln 3+ /Bi 3+ (Ln = Eu, Sm) shifted to the longer wavelength side. Furthermore, the red emission of Eu 3+ ion and the orange emission of Sm 3+ ion are remarkably enhanced by encapsulating Bi 3+ in LuVO 4 system, whereas in the case of LuVO 4 : Dy 3+ /Bi 3+ , the host absorption and the yellow emission from dysprosium have been suppressed in the presence of Bi 3+ . These novel findings will facilitate their use in the display field.
研究领域:
材料科学
·
光学材料
·
发光材料
·
无机化学
·
纳米材料
✓ 已验证
DOI
高影响因子
International Journal of Applied Ceramic Technology
·
2024
·Vol. 21
·期 3
·1768-1777
·
IF 1.8
Liang Chen,Changxing Zhao,Peng Jiang,Shuhong Xie,Kai Pan
(1− x )Pb(Mg 1/3 Nb 2/3 )O 3 – x PbTiO 3 (PMN–PT) has attracted attention due to its excellent electrical properties as a typical relaxor ferroelectric material. High-quality Mn–Sm co-doped 0.68PMN–0.32PT thin films were synthesized on the Pt/Ti/SiO 2 /Si substrates by sol–gel based on spin coating method. The results show that 1 mol% Mn–2 mol% Sm co-doped PMN–PT thin films have high dielectric constant ( ε r ∼ 1895) and relatively low dielectric loss (tan δ ∼ .039) at 1 kHz. They also show superior ferroelectric polarization ( P max ∼ 53.71 μC/cm 2 , P r ∼ 30.85 μC/cm 2 ) and high dielectric breakdown strength (∼1656.6 kV/cm), which are primarily due to the low leakage current density (∼10 −7 A/cm 2 ). This work suggests a practical approach to enhance the dielectricity, piezoelectricity, and ferroelectricity of PMN–PT thin films.
研究领域:
材料科学
·
电子工程
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DOI
高影响因子
International Journal of Electrochemical Science
·
2023
·
IF 1.5
Minling Xie,Liqun Zhu,Weiping Li,Huicong Liu,Tianli Zhang
Sm-Co alloys as permanent magnetic materials have attracted considerable interest for their application in the miniaturization of electronic devices. However, a facile method for depositing Sm- Co alloy films is still urgently needed. In this work, we exploited a simple aqueous electrodeposition approach to prepare Sm-Co films. Electrodeposition was realized by galvanostatic electrolysis from a stable sulfamate aqueous solution. The influence of the applied current density on the composition, morphology, structure and magnetic properties of the Sm-Co films was studied. Samarium was successfully incorporated into the films by the induced effect of Co(II) ions. Manipulating the current density varied the samarium content from 5.8 to 25.3 at%. Sm-Co nanosheets were discovered and were determined to have a mixed nanocrystalline/amorphous character. Furthermore, the electrodeposited Sm-Co films exhibited an obviously enhanced coercivity compared with that of other reported films.
研究领域:
材料科学
·
物理学
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DOI
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2026
·
IF 6.7
Yongguang Xiao,Jibo Xiao,Ningjie Ma,Wei Zhang,Yujie Xiao,Gang Li,Minghua Tang
In this study, Sm-doped HfO 2 (Hf 1- x Sm x O 2 ) thin films on Pt/TiN/SiO 2 /Si substrates were fabricated using chemical solution deposition (CSD) method. The effects of Sm doping concentration on the microstructure and ferroelectric properties of Hf 1- x Sm x O 2 films were systematically investigated. Grazing-incidence X-ray diffraction (GIXRD) analysis and ferroelectric property measurements of the polycrystalline Sm:HfO 2 films with thicknesses ranging from 60 to 88 nm, revealed that samples doped with 2.50% Sm exhibited optimal ferroelectric characteristics with a residual polarization ( P r ) of 15.96 µC/cm 2 and a coercive field ( E c ) of 1.13 MV/cm after annealing at 800℃. Interestingly, the 2.50% Sm-doped sample also demonstrates excellent endurance and retention properties, sustaining over 10 8 switching cycles without breakdown. Furthermore, density functional theory (DFT) calculations were conducted to elucidate the regulation mechanism of doping samarium on the ferroelectric properties of HfO 2 films. The well consistency of the computational results and experimental observations, indicating that samarium doping is a feasible strategy for enhancing the ferroelectric properties of hafnium oxide films.
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产品关联
DOI
高影响因子
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