Heliyon
·
2024
·
IF 3.4
Yige Guo,Xiaoxue Niu,Huaiyu Yang,Liwen Chen,Yizhen Ren,Huining Guo,Bo Wu
The oxidation rate of NO to NO 2 is a critical parameter in the removal of NO x within selective catalytic reduction (SCR) systems. LaCoO 3-δ is a kind of potential catalyst to enhance the oxidation of NO to NO 2 , it may offers an economic and stable alternative to noble metal catalysts, particularly at elevated temperatures. This study aimed to enhance the catalytic efficiency of LaCoO 3-δ through strontium (Sr) doping. La 1-x Sr x CoO 3-δ (with varying x values of 0.1, 0.2, 0.3, 0.4) was synthesized using a sol-gel method. La 1-x Sr x CoO 3-δ exhibited superior NO oxidation catalytic activity compared to LaCoO 3-δ , with the most notable enhancement observed at x = 0.3 (84 % conversion). This improvement can be attributed to the substitution of La 3+ with Sr 2+ , which induces lattice distortion and charge imbalance, thereby creating more oxygen vacancies that enhance the catalytic oxidation capability of La 1-x Sr x CoO 3-δ . However, it's important to note that an excessive amount of Sr can result in the formation of SrCO 3 deposits on the surface of La 1-x Sr x CoO 3-δ , thereby diminishing its catalytic oxidation performance. The catalytic oxidation reaction behavior adhered most closely to the O 2 -adsorbed E-R model, the surface defects in La 1-x Sr x CoO 3-δ playing a pivotal role in the catalytic reaction.
研究领域:
化学
·
环境科学
·
材料科学
✓ 已验证
DOI
PubMed
高影响因子
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
·
2024
·Vol. 35
·期 19
·1-8
·
IF 2.8
Yan Shuai,Hu Wencai,Wang Sen,Liu Gaobin
In this paper, Sr-doped BaTiO 3 nanoparticles were synthesized via electrochemical method, leading to the successful preparation of Ba 0.67 Sr 0.33 TiO 3 (BST) powders. The phase composition and microstructure of the powders were characterized using X-ray diffraction small angle X-ray scattering, scanning electron microscopy (SEM), and transmission electron microscopy. The results show that the average grain size of the nanoparticles is in the range of 10–20 nm, and the particles with good crystallinity are obtained under the environment of 3 mol.L −1 NaOH concentration. Sintering at 1250 ℃ for 3 h yields nanoscale BST ceramics with a dense structure and an average grain size of about 300 nm. These fine-grained ceramic samples exhibit superior temperature stability compared to relatively coarser BST ceramics. Furthermore, due to their nanoscale grain size, extensive phase transitions result in a low dielectric constant as observed from the dielectric property data. This work presents a novel approach for preparing nanoscale powders and homogeneous ceramics applicable in various electronic applications.
研究领域:
材料科学
·
电子工程
✓ 已验证
产品关联
DOI
高影响因子
Frontiers in Chemistry
·
2025
·
IF 4.2
Xianqi Wei,Jiayi Lu,Silong Zhang,Jiashu Tang,Shichao Wu,Tengbo Lv,Xiaoli Wang
CsPbBr 3 (CPB) perovskite has demonstrated unique advantages as a photoelectric material. However, its stability and optoelectronic properties exhibit significantly susceptibility to environmental conditions during practical applications. Additionally, the synthesis of CPB often involves complex procedures and stringent requirements for the experimental environment, resulting in low yield. In this study, we employed an aqueous-phase synthesis method to incorporate strontium into CPB, aiming to enhance the long-term stability of the perovskite in aqueous solutions. And the introduction of strontium (Sr) is expected to improve the photoluminescent properties of the perovskite. The results demonstrate that the synthesized perovskite remains stable in aqueous solution for up to 264 h, with enhanced photoluminescence intensity and a blue shift attributed to the incorporation of strontium. This approach significantly increases the potential value of CPB perovskite for applications in optoelectronic materials and devices.
研究领域:
材料科学
·
光学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Frontiers in Bioengineering and Biotechnology
·
2022
·
IF 6.064
Wang Peng,Zhou Xiaosong,Lv Caili,Wang Yu,Wang Zongliang,Wang Liqiang,Zhu Yongzhan,Guo Min,Zhang Peibiao
The endogenous electrical potential generated by native bone and periosteum plays a key role in maintaining bone mass and quality. Inspired by the electrical properties of bone, different negative surface potentials are built on microspheres to restore electric microenvironment for powerful bone regeneration, which was prepared by the combination of strontium-doped barium titanate (Sr-BTO) nanoparticles and poly (lactic-co-glycolic acid) (PLGA) with high electrostatic voltage field (HEV). The surface potential was modulated through regulating the phase composition of nanoparticles in microspheres by the doping amount of strontium ion (Sr2+). As a result, the 0.1Sr-BTO/PLGA group shows the lowest surface potential and its relative permittivity is closer to natural bone. As expected, the 0.1Sr-BTO/PLGA microspheres performed cytocompatibility, osteogenic activity in vitro and enhance bone regeneration in vivo. Furthermore, the potential mechanism of Sr-BTO/PLGA microspheres to promote osteogenic differentiation was further explored. The lower surface potential generated on Sr-BTO/PLGA microspheres regulates cell membrane potential and leads to an increase in the intracellular calcium ion (Ca2+) concentration, which could activate the Calcineurin (CaN)/Nuclear factor of activated T-cells (NFAT) signaling pathway to promote osteogenic differentiation. This study established an effective method to modulate the surface potential, which provides a prospective exploration for electrical stimulation therapy. The 0.1Sr-BTO/PLGA microsphere with lower surface potential and bone-matched dielectric constant is expected to have great potential in the field of bone regeneration.
研究领域:
生物材料学
·
骨组织工程
·
细胞生物学
✓ 已验证
DOI
PubMed
高影响因子
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
·
2025
·
IF 8.3
Yanru Yin,Qi Xiao,Wenying Zhang,Kai Li,Dong Yan,Jian Li,Lichao Jia
Cathode materials greatly govern the performance of protonic ceramics fuel cells (PCFCs), and development of suitable cathodes for PCFCs now becomes important. In this study, the traditional proton conductor BaZrO 3 is tailored with Sr and Fe elements, aiming to design proper cathodes for PCFCs. The structural, electronic, and catalytic effects of dual-element doping on BaZrO 3 -based materials are systemically investigated. Experimental and computational analyses reveal that a 75 % iron doping concentration (BaZr 0 · 25 Fe 0 · 75 O 3 ) markedly enhances oxygen vacancy concentration, reduces proton migration barriers, and elevates electrical conductivity. Notably, moderate strontium doping (50 %) synergistically improves performance, whereas excessive doping (75 %) induces adverse effects on oxygen vacancy concentration, proton migration, and electrical conductivity. The optimized Ba 0 · 5 Sr 0 · 5 Zr 0 · 25 Fe 0 · 75 O 3 cathode achieves a peak power density of 945 mW cm -2 at 700 °C. These findings elucidate the interplay between dopant elements, doping concentrations, and material properties related to electrochemical performance, offering actionable strategies for designing high-performance PCFC cathodes.
研究领域:
材料科学
·
能源科学
✓ 已验证
产品关联
DOI
高影响因子
FIBERS AND POLYMERS
·
2024
·
IF 2.2
Zhou Kui,Hu Rugang,Li Hanjing,Chen Hongwei
In this study, chitosan/hydroxyapatite nanowire composite scaffolds were prepared by the cryogenic 3D printing method. Their properties were investigated for bone regeneration. Synthesized hydroxyapatite nanowire and strontium doped hydroxyapatite nanowire were studied by scanning electron microscopy, transmission electron microscopy, X-ray diffraction, Fourier transform infrared spectroscopy, X-ray photoelectron spectroscopy, and thermogravimetry. The synthesized nanowires have good biocompatibility. Then, chitosan/hydroxyapatite nanowire composite scaffolds were prepared by cryogenic 3D printing. The morphologies, composition, biocompatibility, and osseogenesis in vivo of scaffolds were observed. Results indicated that scaffolds prepared by cryogenic 3D printing exhibited desirable 3D interconnected macro/microporous structures and good biocompatibility. Meanwhile, in vivo cranial defect implantation results confirmed that chitosan and strontium-doped hydroxyapatite nanowire composite scaffolds have the best ability of in vivo bone regeneration. The present composite scaffold has promising characteristics for bone regeneration.
研究领域:
生物材料学
·
组织工程学
·
医学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2024
·
IF 5.8
Ze Wei,Xueqing Xiong,Xiyong Chen,Juntao Pan,Donglin Cai,Xiaomei Huang,Gang Han,Yihui Liu,Zezuo Jiang,Toyohisa Fujita
The effects of Sr doping on the crystal structures, thermal expansion behaviors, defect chemistries , electrical and electrochemical properties of the perovskite materials, La 0.5 Gd 0.5 Ba 1− x Sr x Co 2 O 5+ δ (LGBCOSr- x, x =0–0.5), were systematically analyzed and discussed. The X-ray diffraction (XRD) investigation revealed that LGBCOSr- x undergoes a phase transformation from tetragonal ( x =0.1) to cubic ( x =0.5), and the materials exhibit good thermochemical compatibility with Ce 0.9 Gd 0.1 O 1.95 (GDC) under 1100 °C. Partial replacement of Ba with Sr is found helpful in decreasing the thermal expansivity of LGBCOSr- x and increasing the ability of oxygen vacancy formation in the materials. The latter could be attributed to the enhancement in the overall electrical conductivity and oxygen transport process in terms of low cathodic polarization resistance in LGBCOSr- x materials with high Sr doping content. Further analysis on the AC impedance spectroscopy assisted with the DRT (distribution of relaxation times) methodology suggested that the charge transfer sub-process is a predominant step in the oxygen transport processes across the LGBCOSr- x materials. These findings indicate that La 0.5 Gd 0.5 Ba 1− x Sr x Co 2 O 5+ δ is a promising cathode material for intermediate temperature solid oxide fuel cells.
研究领域:
材料科学
·
能源科学
✓ 已验证
产品关联
DOI
高影响因子
JOM
·
2021
·Vol. 73
·期 6
·1745-1753
·
IF 2.474
Li Ke,Li Shuiyuan,Ai Fanrong,Yan Jinchao,Zhou Kui
Strontium (Sr) is a trace metal ion that exists in natural bones. It not only regulates metabolism but also promotes osteoblast differentiation and the formation of new bones. In this study, a new method was developed to prepare Sr-doped hydroxyapatite (HA) three-dimensional (3D) porous scaffolds. A preliminary scaffold was obtained by an extrusion 3D printing method using HA–sodium alginate composite slurry as printing ink. Then, the obtained scaffolds were immersed in a strontium chloride (SrCl 2 ·6H 2 O) solution of different concentrations (1 wt.%, 5 wt.%, 10 wt.%, and 15 wt.%) for 24 h. Finally, the scaffolds were dried and then sintered at 1200°C to obtain the final scaffolds. The Sr-doped scaffolds were characterized by scanning electron microscopy, x-ray diffraction, Fourier-transform infrared spectroscopy, mechanical testing, and cell culture testing. The results show that the Sr-doped HA scaffold has better compactness and compressive strength than the HA-0Sr scaffold, and promotes cell proliferation and osteoblast differentiation. This indicates that the alternative method is suitable for preparing ion-doping ceramic scaffolds for bone tissue engineering.
研究领域:
生物材料学
·
医学工程
·
细胞生物学
✓ 已验证
产品关联
DOI
高影响因子
CERAMICS INTERNATIONAL
·
2022
·
IF 5.532
Chuanqi Liu,Dingyu Yang,Haibo Tian,Wen Zhang,Jun Zhu
The CsPbX 3 perovskites have demonstrated promising applications in the field of X-ray detection. Appropriate element doping to substitute Pb in CsPbX 3 not only improves the photoresponse performance of the resulting material but also reduces the Pb content for achieving environmental protection. Herein, X-ray detectors based on Sr-doped CsPb 1-x Sr x Br 3 thick films were developed. The effects of Sr doping concentration were investigated. The incorporation of Sr increased the density of the CsPbBr 3 thick film and modulated the bandgap of the materials. CsPb 1-x Sr x Br 3 exhibited good optical responses at different bias voltages and X-ray doses. The X-ray response improved as the Sr-doping concentration increased. Therefore, the partial substitution of Sr into CsPbBr 3 is suitable for reducing the Pb content in X-ray detectors. Furthermore, the development of CsPb 1-x Sr x Br 3 thick films provides a new strategy for the detection of X-rays.
研究领域:
材料科学
·
医学成像
·
环境科学
✓ 已验证
产品关联
DOI
高影响因子
CRYSTENGCOMM
·
2022
·Vol. 24
·期 8
·1546-1555
·
IF 3.756
Ming Wang,Yunli Wang,Yue Tian,Yingchun Zhu
Sr doping in hydroxyapatite (HA) biomaterials has attracted continuous interest due to its well-known positive effects on bone formation. Investigating the effects of Sr on the HA crystal structure is of primary importance for understanding the underlying mechanisms of structure–property relationship. However, the effect of Sr on the HA crystal structure is still controversial and incomplete. Herein, the anisotropic effects of Sr doping on the HA crystal structure are determined by experimental, theoretical and simulative investigations. The good agreement of the results suggests that Sr preferentially replaces Ca(1) sites in the HA structure with a Sr content of 10 mol%, and causes significantly larger expansion in the c-axis direction than in the a-axis direction. The relative expansion rate in the c-axis direction is about 2.22 times that in the a-axis direction, which induces an increased aspect ratio of Sr-HA nanocrystals. When Sr replaces Ca(1) sites, the Sr–O bond length in the SrO6 configuration increases compared with that in Ca(1)O6, giving rise to the anisotropic lattice expansion due to the different projection lengths in different directions of this configuration. Moreover, reaction process investigations show that Sr is incorporated in HA by multi-step reactions from Sr-DCPD to Sr-DCPA and to Sr-HA. These findings shed new light on the anisotropic effect of Sr ions on the HA crystal structure, and provide a theoretical basis for development of ion-modified HA biomaterials.
研究领域:
材料科学
·
生物医学工程
✓ 已验证
DOI
高影响因子
CERAMICS INTERNATIONAL
·
2021
·
IF 4.527
Xiang Ji,Xinyi Dai,Fuzhong Wu,Yi Mai,Haijun Chen,Yijing Gu
LiNi 0.5 Mn 1.5 O 4 (LNMO) is a promising next-generation cathode material for high energy density lithium-ion batteries, but the application of LNMO is blocked because of its inherent side effects with electrolytes at high voltages, namely, serious Mn dissolution and capacity attenuation. A novel LiNi 0.5 Mn 1.5-x Sr x O 4 material (x = 0, 0.05, 0.1, 0.15, and 0.2) was successfully prepared using the sol-gel method, and the effect of varying in situ Sr 2+ -doping on the crystal structure, morphology, and electrochemical performance was researched. A series of characterizations showed that the Sr-doped LNMO structure contains less Mn 3+ , which enhances its cycling stability. In addition, Sr doping promotes morphological changes more remarkably. Accompanied by the appearance of (100) surfaces, the morphology of LNMO changes from an octahedron to a truncated octahedron. The (100) surface can effectively inhibit side reactions with the electrolyte and steady the structure at the working voltage, which also helps support Li + transport kinetics. The Sr-doped LiNi 0.5 Mn 1.4 Sr 0.1 O 4 (expressed as LNMO-Sr0.1) cathode exhibits preeminent cycling stability, after 500 cycles at 1C, the capacity retention is 86.63 %. CV and EIS results show that the right amount of Sr doping efficiently reduces electrode polarization and charge transfer resistance and increases the Li + diffusion coefficient .
研究领域:
材料科学
·
电化学
✓ 已验证
DOI
高影响因子
Materials
·
2023
·Vol. 16
·期 8
·3160
·
IF 3.4
Siyu Liu,Yaodong Yang,Yongming Hu,Wei-Feng Rao
This study investigates the impact of Sr doping on the tribocatalytic performance of BaTiO3in degrading organic pollutants. Ba1-xSrxTiO3(x = 0–0.3) nanopowders are synthesized and their tribocatalytic performance evaluated. By doping Sr into BaTiO3, the tribocatalytic performance was enhanced, resulting in an approximately 35% improvement in the degradation efficiency of Rhodamine B using Ba0.8Sr0.2TiO3. Factors such as the friction contact area, stirring speed, and materials of the friction pairs also influenced the dye degradation. Electrochemical impedance spectroscopy revealed that Sr doping improved BaTiO3’s charge transfer efficiency, thereby boosting its tribocatalytic performance. These findings indicate potential applications for Ba1-xSrxTiO3in dye degradation processes.Keywords:tribocatalysis;barium strontium titanate;substitution;friction;dye degradation
研究领域:
材料科学
·
环境科学
✓ 已验证
DOI
PubMed
高影响因子
危险品化学品经营许可证（带存储）