ACS Applied Materials & Interfaces
·
2026
·
IF 7.8
Jianzhi Yu,Xucong Liu,Mengjin Zhong,Shiwei Yang,Li Li,Bo Chi,Jian Pu
A reversible solid oxide cell (RSOC) can generate electricity and hydrogen, respectively, when operating in solid oxide fuel cell (SOFC) and solid oxide electrolysis cell (SOEC) modes. However, at high current densities, serious Sr segregation in the traditional La0.6Sr0.4Co0.2Fe0.8O3−δ-Gd0.1Ce0.9O2−δ (LSCF-GDC) oxygen electrode leads to a decrease in the catalytic activity of the cathode and consequently poor performance stability of RSOC. In this work, Ca doping was proposed to suppress Sr segregation in the LSCF-based composite electrodes. The smaller radius of the Ca atom could reduce the elastic driving force of Sr segregation, while the reasonable Ca-doping concentration could alleviate the steep oxygen vacancy gradient formed under high current density and thereby reduce the electrostatic driving force of Sr segregation. Consequently, after appropriate Ca substitution at the A-site, the prepared La0.6Sr0.2Ca0.2Co0.2Fe0.8O3−δ-Gd0.1Ce0.9O2−δ(LSCCF-GDC) oxygen electrode reported significantly enhanced stability during long-term operation at high current density. At 750 °C and a current density of 1.2 A·cm–2, the degradation rates of the cell with LSCCF-based composite oxygen electrode were 10 mV/100 h in SOFC mode and 17 mV/100 h in SOEC mode, which was much lower compared with the corresponding values of the cell with the traditional LSCF-based composite oxygen electrode (18 mV/100 h in SOFC mode and 82 mV/100 h in SOEC mode).
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高影响因子
BIORESOURCE TECHNOLOGY
·
2026
·
IF 8.2
Guangyao Yang,Bingjie Liu,Shiyuan Xie,Yongqing Xu,Jingbo Jia,Hui Zhou,Dongwu Chang,Changfu You,Haiming Wang,Junfu Lyu
Biomass chemical looping gasification (BCLG) demonstrates great potential to help address global environmental issues and green energy demands. Yet it remains a challenge to develop novel oxygen carriers (OCs) in BCLG to break the trade-off between the biomass conversion and syngas selectivity with high syngas yield. In this study, Sr–Fe OCs labelled as S3F2, S4F2, and S5F2, containing primarily of Ruddlesden–Popper (R-P) layered perovskite structured Sr 3 Fe 2 O 7-x , were synthesized. Sr 3 Fe 2 O 7-x thermodynamically favors the selective formation of CO over CO 2 , conferring its inherently high CO selectivity. Both the interstitial oxygen and lattice oxygen were found to contribute to the gasification process, which presented enhanced activity and oxygen uncoupling characteristic. The excessive Sr incorporation in S4F2 and S5F2 further increased the oxygen vacancies of Sr 3 Fe 2 O 7-x , and caused a much higher oxygen mobility and oxygen release capacity (S5F2 > S4F2 > S3F2). Additional Sr in S5F2 formed Sr(OH) 2 ·H 2 O on Sr 3 Fe 2 O 7-x surface, which acted as additional oxygen source for gasification and also suppressed the overoxidation of syngas product on the surface. These combined features enabled the most favorable performance of S5F2 with a carbon conversion of 91%, CO selectivity of 94%, and syngas yield of 1208 mL/g at 900 °C, much higher than the Fe 2 O 3 benchmark (77.8%, 59.8%, and 557.9 mL/g, respectively).
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高影响因子
JOURNAL OF THE AMERICAN CERAMIC SOCIETY
·
2025
·
IF 3.8
Yifan Li,Jingyang Wang,Yu Wang,Shuang Cao,Zhenyu Han,Meng Zhang,Lei Zhang
Dion–Jacobson-type (DJ-type) perovskite CsA 2 Nb 3 O 10 (A = Ca, Sr, Ba) is a compound that can simultaneously accommodate Cs + and A 2+ ions and thus considered as a potential immobilization matrix for radionuclides 137 Cs and 90 Sr. In this work, using A 2+ to simulate bivalent alkaline earth metals, CsA 2 Nb 3 O 10 single crystals were synthesized by the molten salt method. CsA 2 Nb 3 O 10 has good thermal stability up to 900°C. At the same time, CsA 2 Nb 3 O 10 has strong radiation resistance, with most crystals maintain their initial morphology with slight color change. Cations with smaller radii, for example, Na + , K + , and Rb + , do not replace Cs + in the interlayer of CsA 2 Nb 3 O 10 and A 2+ in the NbO 6 polyhedron. CsA 2 Nb 3 O 10 demonstrates a wide range of pH durability, where its frame structure remains stable in the pH range from 2 to 12 and will not be decomposed, while Cs + in CsA 2 Nb 3 O 10 loses more into the solution at the pH range from 2 to 4 and from 10 to 12, and the loss of Sr 2+ and Ba 2+ is much lower than that of Ca 2+ due to slight differences in the framework structure. Further sintering of CsCa 2 Nb 3 O 10 and CsSr 2 Nb 3 O 10 result in high density ceramic with a relative density of 94%–97%, along with improved chemical stability. According to the investigation of the surface morphology and elemental chemical state, it can be confirmed that Cs, A, and Nb elements are uniformly distributed on the surface of ceramics. The normalized leaching rates of Cs, Ca, and Sr in the CsCa 2 Nb 3 O 10 and CsSr 2 Nb 3 O 10 ceramic waste forms are about 1, 1, and 10 −4 to 10 −3 g·m −2 ·d −1 after 28 days, respectively.
研究领域:
材料科学
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核废料管理
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高影响因子
JOURNAL OF NON-CRYSTALLINE SOLIDS
·
2025
·
IF 3.5
Y.T. Liu,Y. Ji,W.J. Zhu,Q. Qian,Q.Y. Zhang
0.9 μm fiber lasers enable efficient generation of blue laser via second-harmonic conversion, which are essential light sources for applications such as undersea communications, laser displays, and biophotonic imaging. Glass fibers doped with Nd 3+ ions serve as the gain medium for these lasers; however, the competition from the four-energy-level transition 4 F 3/2 → 4 I 11/2 remains a significant challenge. Fluorophosphate (FP) glass combines the high rare-earth solubility of phosphate glasses with the low phonon energy of fluoride, particularly benefiting from large crystal field strength that enhances the 4 F 3/2 → 4 I 9/2 transition. Nonetheless, crystallization and phase separation in FP glass pose substantial challenges for this multi-component glass system. Herein, a novel Nd 3+ -doped Sr(PO 3 ) 2 −Ba(PO 3 ) 2 −AlF 3 −MgF 2 glass is reported. A thermodynamic approach was employed to predict the glass-forming region of the Sr(PO 3 ) 2 −AlF 3 −MgF 2 system, providing a robust design framework for FP compositions with superior glass-forming ability. Further investigations into the gradual substitution of Ba(PO 3 ) 2 to Sr(PO 3 ) 2 elucidate the structure-property relationship between the local network environment and Nd 3+ emission at 0.9 µm. The optimized FP glass demonstrates remarkable stability against crystallization (Δ T >100 °C), a high branching ratio (47.2 %), a large emission cross-section (2.36 × 10 −20 cm 2 ), an extended lifetime (334 μs), a high spectral quality factor (7.88 × 10 −24 cm 2 ·s), and a broad gain bandwidth (10.71 × 10 −26 cm 3 ) at 0.9 μm, surpassing previously reported glass hosts and establishing it as a highly promising host material for 0.9 μm fiber laser applications.
研究领域:
光子学
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材料科学
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光学材料
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激光技术
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玻璃科学
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高影响因子
Materials
·
2025
·Vol. 18
·期 13
·2953
·
IF 3.2
Nanxi Lin,Hong Zhang,Yunye Shi,Chenjun Xu,Zhuoqian Xie,Yunjin Chen
The poor magnetic and magneto-optical properties of BiFeO3, along with its significant lattice mismatch with silicon, have limited its application in silicon-based integrated magneto-optical devices. In this study, co-doping with Sr2+and Ti4+ions effectively transformed the trigonal structure of BiFeO3into a cubic phase, thereby reducing the lattice mismatch with silicon to 2.8%. High-quality, highly oriented, silicon-based cubic Sr,Ti:BiFeO3thin films were successfully fabricated using radio frequency magnetron sputtering. Due to the induced lattice distortion, the characteristic periodic spiral spin antiferromagnetic structure of BiFeO3was suppressed, resulting in a significant enhancement of the saturation magnetization of cubic Bi0.5Sr0.5Fe0.5Ti0.5O3(48.0 emu/cm3), compared to that of pristine BiFeO3(5.0 emu/cm3). Furthermore, the incorporation of Sr2+and Ti4+ions eliminated the birefringence effect inherent in trigonal BiFeO3, thereby inducing a pronounced magneto-optical effect in the cubic Sr,Ti:BiFeO3thin film. The magnetic circular dichroic ellipticity (ψF) of Bi0.5Sr0.5Fe0.5Ti0.5O3reached an impressive 2300 degrees/cm.
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ACS Applied Materials & Interfaces
·
2019
·
IF 8.456
Longfei Song,Kunpeng Dou,Rongrong Wang,Ping Leng,Linqu Luo,Yan Xi,Chao-Cheng Kaun,Ning Han,Fengyun Wang,Yunfa Chen
In recent years, it is urgent and challenging to fabricate highly sensitive and selective gas sensors for breath analyses. In this work, Sr-doped cubic In2O3/rhombohedral In2O3 homojunction nanowires (NWs) are synthesized by one-step electrospun technology. The Sr doping alters the cubic phase of pure In2O3 into the rhombohedral phase, which is verified by the high-resolution transmittance electron microscopy, X-ray diffraction, and Raman spectroscopy, and is attributable to the low cohesive energy as calculated by the density functional theory (DFT). As a proof-of-concept of fatty liver biomarker sensing, ethanol sensors are fabricated using the electrospun In2O3 NWs. The results show that 8 wt % Sr-doped In2O3 shows the highest ethanol sensing performance with a high response of 21–1 ppm, a high selectivity over other interfering gases such as methanol, acetone, formaldehyde, toluene, xylene, and benzene, a high stability measured in 6 weeks, and also a high resistance to high humidity of 80%. The outstanding ethanol sensing performance is attributable to the enhanced ethanol adsorption by Sr doping as calculated by DFT, the stable rhombohedral phase and the preferred (104) facet exposure, and the formed homojunctions favoring the electron transfer. All these results show the effective structural modification of In2O3 by Sr doping, and also the great potency of the homojunction Sr-doped In2O3 NWs for highly sensitive, selective, and stable breath ethanol sensing.
研究领域:
材料科学
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纳米技术
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气体传感
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密度泛函理论（DFT）
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化学传感器
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环境监测
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生物医学诊断
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高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2015
·
IF 2.999
Xiwei Liu,Jianke Sun,Kejin Qiu,Yinghong Yang,Zhongjie Pu,Li Li,Yufeng Zheng
Zn, a promising biodegradable material , possesses excellent biocompatibility and biodegradability, however its low strength and hardness largely limit its application in biodegradable implants. The addition of alloying elements would generally be suggested as an effective method for improving the mechanical properties. In the current study, alloying with a minor amount of Ca or Sr in Zn–1.5Mg alloy, the ternary alloys were composed of the matrix Zn and precipitated phase (Mg 2 Zn 11 and CaZn 13 for Zn–1.5Mg–0.1Ca alloy, Mg 2 Zn 11 and SrZn 13 for Zn–1.5Mg–0.1Sr alloy, respectively). Besides, the grain size of ternary alloys became more homogeneous and smaller than that of Zn–1.5Mg alloy. Meanwhile, the effect of alloying elements on the mechanical properties and corrosion behavior of Zn–1.5Mg alloy were analyzed. The results showed that the ternary alloys exhibited much higher yield strength (YS), ultimate tensile strength (UTS) and elongation than those of Zn–1.5Mg alloy. The measured corrosion rates of the ternary alloys were slightly increased due to galvanic corrosion reaction. Besides, a model of the corrosion mechanism in the simulated body fluid was discussed here based on the results of the studied alloys.
研究领域:
生物材料学
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生物医学工程
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金属腐蚀与防护
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可降解植入材料
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生物力学
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高影响因子
Bioactive Materials
·
2022
·
IF 16.874
Shuaijie Li,Liyan Zhang,Chunyu Liu,Jua Kim,Kun Su,Tingli Chen,Limin Zhao,Xiaomei Lu,Hao Zhang,Yinglin Cui,Xu Cui,Feng Yuan,Haobo Pan
Injectable bone biomaterials like bone cement should be designed and fabricated with certain biological criteria, which include: 1) recruitment and polarization of the macrophages from M1 (pro-inflammatory) to M2 (anti-inflammatory) phenotype, 2) enhance vascularization, and 3) activate osteogenic differentiation of bone marrow-derived stem cells to promote bone healing. So far, no injectable biomaterials could spontaneously regulate the entire bone healing process that involves inflammation, angiogenesis, and osteogenesis. Therefore, in this study, we designed bone cement comprised of strontium and copper-incorporated borosilicate glass (Sr/Cu-BSG) in the liquid phase of chitosan to modulate bone healing. In vitro studies showed that the controlled release of Sr and Cu ions up-regulated anti-inflammatory genes(IL-1Ra and TGF-β1) while down-regulating pro-inflammatory genes(IL-1β and IL-6) in macrophages at 3 days. Sr and Cu ions also increased the expressions of angiogenic genes (VEGF and bFGF) in HUVECs at 5 days and osteogenic genes (Runx-2, OCN, and OPN) in hBMSCs at 7, 14, and 21 days. 5Sr3Cu-BSG bone cement exhibited the best anti-inflammatory, angiogenic, and osteogenic properties among the bone cement groups with different Sr and Cu ratios. Short-term and long-term implantation of Sr/Cu-BSGs in femoral condylar bone defects of rats and rabbits confirmed the in vitro results, where the degradation rate of Sr/Cu-BSG matched the bone healing rate. Similar to in vitro , the 5Sr3Cu-BSG group also showed the highest bone formation in vivo. Excellent physical and chemical properties, along with its bone repairing ability, make the Sr/Cu-BSG bone cement a good candidate biomaterial for treating bone defects.
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高影响因子
ELECTROCHEMISTRY COMMUNICATIONS
·
2022
·
IF 5.443
Ziwei Dong,Tian Xia,Qiang Li,Jingping Wang,Shuang Li,Liping Sun,Lihua Huo,Hui Zhao
Highly active cathode materials are crucial to accelerating the commercialization of intermediate-temperature solid oxide fuel cells (IT-SOFCs). Herein, Sr-doped Pr 0.94 Ba 1- x Sr x Co 2 O 5+ δ (PBS x CO) perovskite oxides are evaluated by experimental and theoretical studies. The phase transformation from tetragonal layered double perovskite to cubic simple perovskite can be identified with increasing the Sr fraction. Benefiting from enhanced electrical conductivity and oxygen surface rate, the PBS x CO catalysts deliver excellent electrochemical performance, as evidenced by symmetrical and completed cells test. Among all compositions, the Pr 0.94 Ba 0.7 Sr 0.3 Co 2 O 5+ δ (PBS0.3CO) cathode has the lowest polarization resistance ( R p ) of 0.031 Ω cm 2 at 700 °C. The PBS0.3CO cathode-based fuel cell produces a peak power density of 1077 mW cm −2 , along with a steady operating for 130 h at 700 °C. From the density functional theoretical (DFT) calculations, it is discovered that stronger Co 3d-O 2p hybridization is recognized in the Sr substituting model compared with undoped one. Furthermore, the decreased free energy for oxygen adsorption may facilitate the oxygen reduction reaction (ORR) kinetics. These findings highlight the origin of optimal ORR activity induced by A-site alkaline earth doping in the perovskite catalysts, endowing the rational design of oxide catalysts.
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高影响因子
JOURNAL OF RARE EARTHS
·
2022
·
IF 4.632
Pan Liang,Lianqing Li,Tong Shen,Wenli Lian,Zhihong Liu
In this work, through a facile method of low-temperature (only 350 °C) self-reduction, 1D nano-sized M 2 B 5 O 9 Cl:Eu 2+ (M = Sr, Ca) blue phosphors with highly efficient performance can be obtained. The crystal structure, morphology and photoluminescence (PL) properties including thermal stability of M 2 B 5 O 9 Cl:Eu 2+ (M = Sr, Ca) phosphors were investigated. The M 2 B 5 O 9 Cl:Eu 2+ (M = Sr, Ca) phosphors show broad band excitation spectra and narrow band emission spectra . The photoluminescence quantum yields (PLQY) of M 2 B 5 O 9 Cl:Eu 2+ (M = Sr, Ca) are as high as 98% and 87.2%, respectively. Furthermore, the color purities of M 2 B 5 O 9 Cl:Eu 2+ (M = Sr, Ca) can reach 99.1% and 93.2%, respectively. When heated up to 150 °C, the emission intensities of M 2 B 5 O 9 Cl:Eu 2+ (M = Sr, Ca) phosphors can still keep 72.7% and 80.0%, respectively. Finally, the above-mentioned phosphors exhibit outstanding performance when manufacturing WLEDs.
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高影响因子
FUEL
·
2023
·
IF 7.4
Xiaoshan Dong,Jian Wang,Fawei Lin,Jian Li,Tianxiao Yu,Beibei Yan,Guanyi Chen
Photothermal steam reforming (PTR) has emerged as an attractive approach for catalytic tar removal, due to the excitation of the photothermal synergistic effect. However, the role of oxygen species in PTR is still unclear. In this paper, the effect of alkaline earth metals (Ca and Sr) A-site-substitution on perovskite LaNi 0.6 Mn 0.5 O 3 was investigated to reveal the role of oxygen species in PTR. The substitution of alkaline earth metals into perovskite lattice affected the dispersion of nickel and significantly adjusted the active oxygen species content on the catalyst surface. Oxygen species are crucial to the carbon deposition behavior of catalysts in PTR. La 0.7 Ca 0.3 Ni 0.6 Mn 0.5 O 3 was rich in reactive oxygen species, which effectively inhibited the deposition and graphitization of coke, resulting in its good coke resistance and catalytic stability in PTR. Ultraviolet–visible light (UV–vis) supported the formation of oxygen vacancies and the dissociation of H 2 O to hydroxyl radicals through the photochemical reaction, which ultimately increased the surface adsorbed oxygen contents. Meanwhile, UV–vis promoted the migration and reaction of lattice oxygen. The photoactivation of oxygen species by UV–vis effectively enriched active oxygen species and improved the coke resistance, which resulted in enhanced catalytic stability of PTR at low-temperature.
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高影响因子
CERAMICS INTERNATIONAL
·
2023
·
IF 5.2
Jiadong Hou,Yufeng Liu,Chufei Cheng,Fuhao Cheng,Teng Su,Chao Ma,Yang Miao,Xiaomin Wang
High entropy materials offer optimal conditions for regulating and modifying new material properties due to their vast composition space. Through traditional solid phase sintering , this article successfully synthesized a series of Sr(Ti 0.2 Zr 0.2 Y 0.2 Sn 0.2 Hf 0.2 Sc 0.2x )O 3-σ high entropy perovskite oxides with varying Sc 3+ doping concentrations and comprehensively investigated the microstructure morphology, crystal structure, and electrical conductivity of Sc-doped HEPs as well as their influence on oxygen transfer rate. The results demonstrate the successful incorporation of Sc 3+ into the high entropy lattice, resulting in a transformation of the crystal to a positively cubic structure with enhanced reciprocity. While the lattice vibration of BO 6 octahedron is weakened by the introduction of Sc 3+ , it has no impact on the phase stability of the crystal structure. Moreover, The results of the electrochemical impedance spectroscopy test demonstrate that at a temperature of 750 °C, with a doping amount of Sc 3+ at 0.14, the conductivity (σ) of Sc 3+ is measured to be 5.74 × 10 −3 S/cm, exhibiting an increase of 61.7% compared to non-doped samples. Correspondingly, the activation energy (Ea) is reduced from 0.51 eV to 0.39 eV as well. This doping strategy effectively expands the potential applications of high entropy perovskite oxides in solid oxide fuel cells (SOFCs). These findings serve as a driving force for further investigation into high entropy ceramics of the strontium series that exhibit optimal properties.
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