JOURNAL OF MATERIALS SCIENCE
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2021
·Vol. 56
·期 23
·13243-13258
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IF 4.22
Cao Yi,Tang Peiyuan,Li Shijingmin,Qiu Wenfeng
Abstract Since the previous research confirms the lanthanum titanate (LTO) flexible self-supporting film can be considered as excellent energy storage material, we intend to maximize the performance of LTO to provide higher energy density for practical application. In order to achieve this goal, the Sr element was a choice to substitute with La for increasing the amount of oxygen vacancies in this study, and mechanical flexibility of the film was also maximally preserved. For determining the most appropriate amount of Sr doping, a serious of Sr-doped LTO films marked as LTO- x (0.1 ≤ x ≤ 0.5) were synthesized by electrospinning combined with calcination method. After analyzed by the XRD, SEM, TEM, XPS and electrochemical work station, the LTO-0.3 sample shows the best properties with a maximum capacitance of 1.8 F·cm −2 at 2 mA·cm −2 . As a result of that, we fabricated the flexible all-solid-state supercapacitor device with two LTO-0.3 electrodes and PVA-Na 2 SO 4 gel. This LTO-0.3//LTO-0.3 device exhibits excellent cycling stability, outstanding flexibility and high energy density of 209.4 μWh·cm −2 with the corresponding power density of 2.1 mW·cm −2 . Graphical Abstract
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CHEMICAL PHYSICS LETTERS
·
2020
·
IF 2.029
Jianxia Zhang,Li Liu,Chao Sun,Xiaosong Li,Bing Zhao,Xiangnan Ju,Chunxia Tian,Dan Sun,Guijun Nian
The 3D layered α-Fe 2 O 3 microflowers assembled by pure and Sr-doped nanosheets were prepared by hydrothermal and annealing methods. SEM morphological characterization results show that after the introduction of Sr, the microflowers are assembled from more layered nanosheets. XPS indicates that the material can provide more surface oxygen vacancy defects and oxygen adsorption sites, which is beneficial to the improvement of gas sensitivity. The response of 3 wt% Sr-doped α-Fe 2 O 3 with alkaline earth metal element Sr to 100 ppm ethanol (82.1) is 2.37 times that of pure α-Fe 2 O 3 (34.5) to ethanol at low temperature (220 °C).
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JOURNAL OF HAZARDOUS MATERIALS
·
2023
·
IF 13.6
Xiaoying Zhang,Fangfei Cai,Funing Ma,Paul Reimus,Linlin Qi,Di Lu,Mohamad Reza Soltanian,Zhenxue Dai
Colloids play a crucial role in influencing the mobility of radionuclides in high-level radioactive waste repositories. However, the co-transport behavior of radionuclides and colloids in geological media remains insufficiently understood. This study investigated the transport of Strontium (Sr) in four types of granite minerals (quartz, biotite , K-feldspar, and plagioclase) in the presence and absence of Na-bentonite colloids (Na-BC) using column experiments. Employing a stepwise modeling strategy, this study first determined the basic flow and transport parameters through breakthrough curve analysis of the conservative tracer (Br). Then, the experimental data of Sr in the colloid-free Sr transport experiments and Na-BC in the Sr-colloid co-transport experiments were quantitatively explained using a two-site sorption model and a two kinetic sites model, respectively. Finally, the co-transport behavior of Sr and Na-BC was fitted using the colloid-facilitated solute transport model. The stepwise modeling allowed quantification of the kinetics of Sr sorption onto mobile and immobile Na-BC and highlighted the role of straining in Na-BC retention. In the absence of Na-BC, Sr transport experienced the greatest retardation in biotite, followed by plagioclase, K-feldspar, and quartz, respectively, which positively correlated with the specific surface area of the minerals. Moreover, Na-BC enhanced Sr transport with the same retardation order in all tested minerals, with recovery rate increments of 68.61%, 19.21%, 6.67%, and 4.33%, respectively. The transport of Sr in K-feldspar was found to be less affected by Na-BC compared to the other tested minerals, likely due to the strong cation exchange capacity of K + among the cation components of minerals, making hydrated K + more likely to exchange with Sr 2+ on K-feldspar surfaces. These findings hold significant implications for assessing the risks associated with the transport of radionuclides in deep geological repositories.
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COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
·
2023
·
IF 5.2
Jiahao Zheng,Yuyin Yang,Zhaolong Dai,Jingsong Wang,Yulin Xia,Chenxu Li
Strontium ion in radioactive wastewater causes serious harm to the biological and ecological environment, so the removal of strontium ion is of great significance. We have prepared an inorganic adsorption material (MnO 2 /HMSS) by impregnation method. The adsorbent can effectively remove Sr 2+ in radioactive wastewater. The synthetic materials were characterised by X-ray diffraction (XRD), Scanning electron microscope (SEM), X-ray spectroscopy (EDS), Fourier-transform infrared spectroscopy (FTIR), X-ray photoelectron spectroscopy (XPS) and N 2 adsorption-desorption isotherms. The effects of the mass ratio of manganese dioxide and hollow mesoporous silica spheres, pH, initial concentration of Sr 2+ , adsorption time, competitive ion and other parameters on the adsorption properties were systematically investigated. The results showed that the 4:1Mn0 2 /HMSS composite had the highest adsorption capacity. The adsorption of Sr 2+ on MnO 2 /HMSS is highly dependent on pH and initial solubility. Furthermore, the adsorption equilibrium is reached at 120 min, with a maximum adsorption capacity of 138.70 mg/g. In addition, the composite still maintains a good adsorption capacity under a variety of competitive ions. The Langmuir and pseudo-second-order models can better fit the adsorption isotherm and kinetic data than the Freundlich and pseudo-first-order models, respectively. The new composite obtained in this work has the advantages of rapid adsorption, large adsorption capacity, strong selectivity and capable of large-scale preparation, which makes it expected to play an important role in the removal of strontium ions.
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Catalysts
·
2023
·Vol. 13
·期 2
·450
·
IF 3.9
Muhammad Naeem Younis,Zhiheng Ren,Chunshan Li,Erqiang Wang,Jie Li
The advancing effects of various alkali and alkaline earth metals (inclusive of K, Ca, and Sr) modified Cu/SiO2catalysts, prepared with a modified precipitation-gel method, were investigated for the production of ethanol via hydrogenation of methyl acetate. Our results showed that Sr-doped catalysts exhibited the best and most consistent results during catalytic tests. A series of techniques, including X-ray diffraction technique, Raman spectroscopy, N2adsorption/desorption, N2O titration method, FTIR spectroscopy, and H2temperature, programmed desorption and reduction (TPD and TPR), and X-ray Photoelectron Spectroscopy, which was used to check the detailed characterization of Sr modification in the catalyst and its structural impacts on the properties of the catalyst. These results demonstrated that the addition of 5%Sr could strengthen the intrinsic stability of the catalyst by formulating the appropriate ratio of Cu+/(Cu0+ Cu+) to facilitate catalytic outcome improvement. The addition of 5%Sr-30%Cu/SiO2under the most favorable conditions, resulting in the peak conversion of MA (95%) and ethanol selectivity (96%), indicates its magnificent catalytic stabilizing effects. Furthermore, the best performing catalyst was compared and tested under various conditions (LHSV and temperatures) and a 300 h long life run.Keywords:hydrogenation;methyl acetate;ethanol;strontium
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ANALYTICAL CHEMISTRY
·
2019
·
IF 6.35
Chao-Feng Li,Zhu-Yin Chu,Xuan-Ce Wang,Jing-Hui Guo,Simon A Wilde
Thermal ionization mass spectrometry (TIMS) has shown excellent analytical precision for Sr isotopic ratio analysis, even for small masses of material (0.5–10 ng). However, because of the sensitivity limit of TIMS, it is still not possible to obtain high precision 87Sr/86Sr isotope ratios for picogram-level sample sizes (30–100 pg) due to the lack of a highly sensitive emitter. This study is the first to employ a highly sensitive silicotungstic acid emitter to measure Sr isotopes at the picogram-level using TIMS. This emitter produces a 3-fold enhancement in the ionization efficiency of Sr and not only significantly reduces the required sample size but also has good external precision. Analyses of the NIST 987 standard yield an external reproducibility (2 RSD, n = 8) better than ±0.013% even for 30 pg of Sr. It is possible to yield an internal precision (2 RSE) of ±0.003% for 100 pg of sample using the default 1011 Ohm feedback resistors. This method was verified by using a suite of silicate reference materials. Replicate digestions and analyses (n = 8) of the basalt standard BCR-2 (87Sr/86Sr = 0.704998 ± 0.000028, 2 SD) at the 326 ± 30 pg level demonstrates that good external reproducibility is reached on ultratrace level silicate samples. This method has a wide variety of potential applications for samples containing ultralow amounts of Sr in geoscience and archeological studies, such as single grains of mica, sphalerite, and pyrite, single mantle melt inclusions, precious extra-terrestrial materials, and human hair to name just a few.
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JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
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2024
·
IF 5.8
Kaiyun Li,Shuo Huang,Sheng Zhang,Hongyun Jin
Recently SrY 2 O 4 noteworthy the scientific attention because of its excellent high-temperature structural stability and high thermal expansion coefficient. However, the high thermal conductivity and sintering acceleration limit the application of SrY 2 O 4 in the field of thermal barrier coatings. In this work, Sr(Eu 0.2 Ho 0.2 Er 0.2 Tm 0.2 Yb 0.2 ) 2 O 4 high-entropy ceramic that identified by computational screening was prepared by the solid-state method. The results show that Sr(Eu 0.2 Ho 0.2 Er 0.2 Tm 0.2 Yb 0.2 ) 2 O 4 has high thermal expansion coefficient (11.76×10 −6 K −1 , RT–1500 °C), low thermal conductivity (1.39 W·m −1 K −1 , 1500 °C), and improved fracture toughness (1.94 ± 0.05 MPa⋅m 1/2 ). Particularly, the average grain size increases only from 3.42 μm to 10.68 μm after heat treatment at 1600 °C for 10–100 h, indicating excellent sintering resistance. Density functional theory calculations within heterojunction models further reveals the intrinsic connection between the diffusion ability of the grain boundary atoms and the sintering resistance. This strategy provides new insight for the design of sintering-resistant thermal barrier coating materials.
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SEPARATION AND PURIFICATION TECHNOLOGY
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2017
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IF 3.359
Fuyin Ma,Zheng Li,Haogui Zhao,Yiyun Geng,Wei Zhou,Qingnuan Li,Lan Zhang
As a new carbon-based membrane material used for ionic and molecular sieving, the graphene oxide (GO) membrane also has potential application in radiochemical separation. In this work, the permeation performances of some typical metallic elements in high level-liquid waste (HLLW) through the ionic sieving 5-μm-thick GO membranes were investigated. It was found that the permeation rates of ions through GO membranes markedly decreased with the increase of hydrated ionic radii. Cs(I) and Sr(II) permeated through GO membranes quickly, whereas lanthanide ions and actinide ions infiltrated much more slowly, thus providing the feasibility of separation according to the difference of hydrated ionic radii. Moreover, the concentrations of initial metal ions and acidity in feed solutions also had influences on the permeation of ions through GO membranes, and higher initial metal ions and feed solution acidity were favorable to the removal of Cs(I) and Sr(II). The barrier separation test indicated that GO membranes had promising ability for the separation of Cs(I) and Sr(II) from lanthanide and actinide ions due to the difference of hydrated ion radius, and the separation factor of Cs(I)/U(VI) and Sr(II)/U(VI) would reach about 10 and 3 in single penetration. The presented results demonstrated that the membrane separation based on GO membrane would be a promising candidate for the removal of Cs(I) and Sr(II) from HLLW.
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OPTICS EXPRESS
·
2025
·Vol. 33
·期 3
·4940-4956
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IF 3.3
Changran Zheng,Baotong Guo,Tianhe Lu,Xi Zhu,Xi Zhu,Bingxuan Xia,Bobo Yang,Zhoudong Yang,Sergey Lishik,Anton Chernyakov,Jingkang Xiong,Jiajie Fan
(Sr, Ca)AlSiN3:Eu2+ (SCASN) phosphors are widely applied in white LEDs to enhance the red spectral component, thereby improving spectral coverage and potentially contributing to a higher color rendering index. However, the rapid degradation of SCASN phosphors under highly thermal and thermal-humidity conditions restricts broader application. In this study, silica-coated SCASN phosphors were prepared via rapid plasma-assisted film deposition. The 54 nm silica coating significantly altered the wettability, optical properties, and stability of the phosphors. After the silica surface coating, the water contact angle increased from 20° to 125.5°, indicating enhanced hydrophobicity. Further photoluminescence (PL) test results demonstrated an improvement in intensity for the coated phosphor compared to the uncoated phosphor. Moreover, after aging at 100°C and 100% relative humidity for 336 hours, the PL intensity of the uncoated phosphor decreased to 65% of its original value, while the coated phosphor maintained 88.5%. This excellent stability is attributed to the protective silica coating, which acts as a barrier against moisture penetration and prevents the hydrolysis of the phosphor surface. First-principles density functional theory calculations further demonstrated that unsaturated O-Si groups formed during HDMSO decomposition create a silica coating, reducing the surface H2O adsorption energy from -2.544 eV to -0.062 eV. The plasma-assisted deposition method effectively enhances phosphor stability, promoting the development of durable and high-performance LED phosphors.
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CERAMICS INTERNATIONAL
·
2025
·
IF 5.6
Weichen Xu,Xiaomeng Li,Hong Wang,Fuliang Wang,Shouqiang Han,Jing Guo
Microwave dielectric ceramics are critical components in wireless communications. However, it is still a challenge to develop microwave dielectric ceramics with reduced sintering temperatures, high thermal stabilities and good dielectric properties at the same time. Herein, the entropy value, which is able to modulate the grain boundary energy and adjust the inherent sintering temperature, is engineered to develop high-performance microwave dielectric ceramics with low sintering temperatures. The structure-property relationships of AWO 4 ceramics, including (NaCaBi) 1/3 WO 4 , (NaCaSrBi) 1/4 WO 4 , (NaLiCaBiSm) 1/5 WO 4 and (NaLiCaSrBiSm) 1/6 WO 4 with increased entropy values are investigated systematically. X-ray diffraction and high-resolution TEM analyses confirm the formation of single-phase solid solutions with the tetragonal scheelite structure in AWO 4 ceramics. As the number of elements in the A-site varies, the relative permittivities, Q × f values and TCF values shift in the range of 12.2–16.5, 8,000–25,000 GHz and −32.3–31.6 ppm/°C, respectively. Simultaneously, the high-entropy samples demonstrate the lowest sintering temperature of 750 °C among the four formulations. Phillips-Van Vechten-Levine (PVL) complex chemical bond theory reveals that the covalency, lattice energy and bond energy affect the relative permittivity, Q × f value and TCF value, respectively. Raman spectra suggest that high entropy value leads to increased disorder, and infrared reflectivity spectra illustrate that the dielectric response is dominated by polarized optical phonons of [WO 4 ] tetrahedron. It is anticipated that entropy design will facilitate the development of microwave dielectric ceramics in low temperature co-fired ceramic applications.
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Journal of Materiomics
·
2025
·
IF 9.6
Tauqeer Ahmad,Wen Lei,Burhan Ullah,Wen-zhong Lu
A series of (Sr 0.4 Ce 0.4 )TiO 3 + 4% (in mass) Sr 2 CeO 4 + x % B 2 O 3 (SCTO + 4% SCO + x % B 2 O 3 for 1≤ x ≤ 5) composites were synthesized via solid-state reaction to investigate the effects of Sr 2 CeO 4 and B 2 O 3 additives on their structural evolution and microwave dielectric properties. X-ray diffraction (XRD) and Rietveld refinement confirmed the dominant orthorhombic phase (O-phase), with SCO as a secondary phase, indicating a chemically stable composite system. HRTEM and SAED analyses further confirmed the formation of the O-phase through direct observation of the superlattice reflections. Microstructural evolution demonstrated B 2 O 3 -assisted liquid-phase sintering, reducing porosity (0.017→ 0.006) and increasing grain size (3.34 → 6.01 μm) with increasing x % (in mass). Raman spectroscopy verified octahedral tilting and Ce–O stretching, while B 2 O 3 incorporation modified the TiO 6 network via BO 3 /BO 4 interactions. The ε r decreased from 113 (SCTO) to 27 at x = 5%, while τ f improved from +213 to +12×10 –6 /°C. The reduction in ε r arises from a complex interplay of internal factors (ionic polarizability) and external factors (porosity, and density), whereas the variation in τ f is governed by compensating effects from Sr 2 CeO 4 and B 2 O 3 . Optimal microwave performance was achieved at x = 5%, with Q×f = 43,603 GHz, ε r =27, and τ f of +12×10 –6 /°C. The study demonstrates that SCO and B 2 O 3 act as effective modifiers, enhancing densification and dielectric properties in SCTO-based microwave ceramics.
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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.
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