JOURNAL OF ALLOYS AND COMPOUNDS
·
2023
·
IF 6.2
Wenji Ruan,Menglin Wu,Yuanhua Xia,Jiupai Ni,Chengsheng Ni
This study aimed at improving electrocatalytic activity of solid oxide electrolysis cell (SOEC) cathode via in-situ exsolved nanoparticles. La 0.67 Sr 0.33 Fe 0.67 Ti 0.33 O 3-δ (LSFT) and La 0.67 Sr 0.33 Fe 0.6 Ni 0.067 Ti 0.33 O 3-δ (LSFNT-67) cathodes with a La/Sr ratio about 2.0 showed the exsolution of Fe 0 and FeNi 3 alloy nanoparticles, respectively, under a reducing atmosphere. The SOEC with LSFT of electrocatalysis is better than LSFNT-67 at 800 °C for direct electrolysis of CO 2 , the current density of LSFT and LSFNT-67 reach − 0.54 A cm −2 and − 0.29 A cm −2 , respectively, and the Faradaic efficiency is close to unity during the 25 h′ durability under a − 1.3 V bias. The better cell performance for the cell with LSFT than LSFNT-67 could be related to the larger distortion and the less amount of insulating LaSrGa 3 O 7 in the former, causing its unexpectedly larger quantity of metal exsolution and electron conduction for more active reaction sites for CO 2 activation. This work demonstrated that apart from thermodynamic consideration, steric effect of the B site cation could be important for the exsolution of metal particles from a perovskite with high La/Sr ratio and the resultant electrocatalysis of CO 2 electrolysis.
研究领域:
材料科学
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电化学
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催化
·
能量转换
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DOI
高影响因子
ADVANCED FUNCTIONAL MATERIALS
·
2024
·Vol. 34
·期 33
·2316654
·
IF 18.5
Feng Xu,Ming Chen,Yaoxuan Cui,Libin Qian,Jin Wang,Zhao Han,Yanli Lu,Di Wang
The electronic nose aims to emulate the olfactory capabilities of osmatic animals, utilizing olfactory sensing array with different sensing characteristics to perceive odors. However, the separate precursors and preparation methods of sensing materials pose challenges in the fabrication of an olfactory sensing array. In this work, the customization of the surface crystal phase of Sr─Fe─O materials (SFO) is demonstrated through the control of annealing temperature, enabling the simple fabrication of an olfactory sensing array using a single precursor. Significantly, the SFO materials exhibit diverse proportions of surface crystal phases, showcasing varied selective characteristics toward volatile organic compounds (VOCs). The materials also demonstrate remarkable responsiveness, linearity, and response/recovery times. Furthermore, this study unraveles the intricate gas-sensor mechanism through first principle calculations, revealing that Fe spin-down d band center of Sr 3 Fe 2 O 7 , located near the Fermi level, significantly enhances the binding strength of intermediates, leading to a higher response specifically to certain VOCs. Integrating these materials into a unified device, the sensor array quantitatively and discriminatively detected different VOCs. The results indicate that SFO materials hold tremendous potential as a promising and easily manufacturable olfactory material system.
研究领域:
材料科学
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传感器与仪器
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气体传感技术
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钙钛矿材料
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电子鼻系统
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DOI
高影响因子
CERAMICS INTERNATIONAL
·
2023
·
IF 5.2
Shuqun Wang,Hua Su,Fangyi Huang
In this work, two low-temperature co-fired silicate ceramics (CaMg 0.9- x Li 0.2 Co x Si 2 O 6 , x = 0.15–0.75, CMLCS; CaMg 0.9-y Li 0.2 Sr y Si 2 O 6 , y = 0, 0.05, 0.1–0.5, CMLSS) were synthesized via solid-state reaction method with 0.5 wt%LBSCA glass addition. CMLCS and CMLSS were densely sintered at 925 °C, and had good chemical compatibility with silver. Optimal microwave dielectric properties ( ε r = 6.71, Q×f = 30124 GHz, and τ f = −79.06 ppm/°C) and ( ε r = 6.78, Q×f = 32530 GHz, and τ f = −52.99 ppm/°C) were obtained for CMLC 0.15 S and CMLS 0.05 S respectively. With increase in Co and Sr substitution, XRD and Raman spectra showed that second phases were produced, and densification process of CaMgSi 2 O 6 -based ceramics was promoted. Dielectric constant was influenced by relative density, Raman shift and second phase. The parameter Q×f was affected by the FWHM of Raman peaks as well as extrinsic factors that affected the temperature coefficient of resonant frequency. Therefore, the results suggested the potential of these two ceramics as candidates for LTCC application.
研究领域:
材料科学
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电气工程
·
陶瓷
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产品关联
DOI
高影响因子
JOURNAL OF SOL-GEL SCIENCE AND TECHNOLOGY
·
2022
·Vol. 103
·期 3
·865-875
·
IF 2.606
Jia Jiannan,He Mengting,Wang Yunpeng,Zhang Wei,Wan Jun,Zhang Yuting,Xu Qiang,Chen Shiguo,Qiao Xvsheng,Fan Xianping
A propylene oxide (PO)-driven fast sol-gel route followed with a post high temperature calcination were utilized to synthesize Ca x Sr 1- x Al 2 O 4 : Eu 2+ cationic solid solution phosphors with micro-spherical morphologies and improved internal quantum efficiencies. The polyethylene oxide (PEO) was also employed to induce the phase separation of Ca x Sr 1- x Al 2 O 4 : Eu 2+ precursors to get monodispersed spherical morphologies in the sol-gel system. Benefit from uniform copolymerization of each chemical components and pyrolysis of organic matter, Ca, Sr, Al and O were homogenously distributed in the produced Ca x Sr 1- x Al 2 O 4 : Eu 2+ cage like microspheres. It helps to efficiently trap incident light and to improve the PL efficiencies. By changing the ratio of Ca/Sr, infinite solid solution polycrystalline phosphors, Ca x Sr 1- x Al 2 O 4 : Eu 2+ microspheres with x = 0~1, can be obtained and their PL emission can be gradually tuned from green to white to blue. Micro-spherical SrAl 2 O 4 : Eu 2+ , Ca x Sr 1- x Al 2 O 4 : Eu 2+ and CaAl 2 O 4 : Eu 2+ phosphors exhibited internal quantum efficiencies as high as 71.1, 35.3~45.9 and 75.3%, respectively.
Graphical abstract
研究领域:
材料科学
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化学
·
光学
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产品关联
DOI
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.
研究领域:
生物材料
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组织工程
·
骨科
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生物医学工程
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材料科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF POWER SOURCES
·
2024
·
IF 8.1
Fang-Ze Han,Yu-Fei Wan,Cheng-Xin Li,Shan-Lin Zhang
The development of solid-oxide cells requires fuel electrodes capable of promoting highly catalytic activities for CO 2 electrochemical reduction (CO 2 R). This study develops a fuel electrode material, Sr(Ti 0·3 Fe 0·63 Ru 0.07 ) O 3-δ (STFR) perovskite, enhance with in-situ exsolved Fe–Ru nanoparticles (STFR–FeRu), demonstrating excellent electrochemical catalytic activity for CO 2 R, considerable stability, and high selectivity for CO 2 electrolysis. Notably, the study discovered for the first time that STFR–FeRu exhibits significantly enhanced catalytic activity in a CO 2 -containing atmosphere compares to that in hydrogen-based fuels. At 800 °C and 1.3 V, La 0·8 Sr 0.2 Ga 0.8 Mg 0·2 O 3-δ electrolyte-supported cells with STFR–FeRu fuel electrode, for direct CO 2 electrolysis, realizes a current density of 1.77 A cm −2 . This current density is 50 % higher than that of H 2 O electrolysis under the same conditions. Additionally, the cell achieves a current density of 1.54 A cm −2 for CO 2 –H 2 O co-electrolysis, with a high CO 2 electrolysis selectivity (CO concentration exceeding 60 % in the electrolysis products).
研究领域:
材料科学
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电化学
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能源材料
·
催化
✓ 已验证
产品关联
DOI
高影响因子
INORGANIC CHEMISTRY
·
2020
·
IF 4.825
Wan Jiang,Yuyuan Bai,Qinzhen Li,Xiean Yao,Hui Zhang,Yongbo Song,Xiangming Meng,Haizhu Yu,Manzhou Zhu
An understanding of the response of nanomaterials to specific environmental parameters is an essential prerequisite for their practical use, especially in living systems. Herein, we disclose the preparation of a water-soluble nanocluster Au16(SR)12 (SR denotes deprotonated captopril) and its characterization by a combination of theoretical (e.g., density functional theory calculations) and experimental (UV–vis, electrospray ionization mass spectrometry, etc.) methods. Interestingly, Au16(SR)12 was found to convert to Au18(SR)14 under acidic conditions, while the reverse conversion from Au18(SR)14 to Au16(SR)12 occurred upon the addition of base. A mechanistic investigation determined this pH regulation to originate from the distinct steric and electrostatic properties of these two clusters. This study is the first to report the susceptibility of Au18(SR)14 and Au16(SR)12 to pH, and the distinct pH stability unambiguously reveals the importance of size-tracking of nanomaterials in living systems for future clinical applications.
研究领域:
纳米材料
·
生物化学
·
理论计算
✓ 已验证
DOI
PubMed
高影响因子
APPLIED SURFACE SCIENCE
·
2022
·
IF 7.392
Zhiyuan Yu,Xin Gu,Yu Gao,Xiaoli Guan,Shuaizhao Jin,Hongjiang Li,Hui Zhang,Xiang Liu
La 0.67 K 0.33- x Sr x MnO 3 thin films were grown on LaAlO 3 ( 010 ) substrates via sol–gel and spin coating methods. The replacement of K ions with Sr ions affected the e g electron bandwidth and concentration of Mn 3+ /Mn 4+ pairs as well as effectively modulated the magnetic/orbital order and lattice structure. Consequently, the ferromagnetic metal to paramagnetic insulation transition was affected, which further optimized the resistivity, temperature coefficient of resistivity ( TCR ), peak TCR temperature ( T K ), and peak resistivity temperature ( T P ). At temperatures below 230 K, temperature-independent scattering and electron-electron scattering were practically not observed in the films. Overall, electrical properties of films improved with an increase in the Sr doping content. The superior La 0.67 K 0.27 Sr 0.06 MnO 3 film exhibited a maximum TCR of 11.88% K −1 (298.3 K), which is approximately 31% higher than that of bulk ceramic with the same composition . The as-developed films exhibit significant potential for application in uncooled infrared bolometers .
研究领域:
材料科学
·
物理学
✓ 已验证
产品关联
DOI
高影响因子
Biomaterials Advances
·
2022
·
IF 0
Liqiu Hu,Yongmei Ge,Zhe Cao,Ye Tian,QiLi Sun,Zhen Li,Jing Ma,Yutong Wu,Ning Wang,Bin Tang
Polyetheretherketone (PEEK) is a potential bone repair material because of its stable chemical and good mechanical properties. However, the biological inertness of PEEK limits its clinical application. Sr 2+ has multi biological functions, including promoting bone formation and blood vessel regeneration and inhibiting inflammation. In this paper, PEEK was modified with Sr 2+ with the purpose to construct PEEK bone graft material with triple functions of osteogenesis, angiogenesis, and anti-inflammatory. The results showed that Sr-modified PEEK could stably release Sr 2+ for a long time in the PBS solution, and indeed could promote the proliferation and differentiation of osteoblasts, promote angiogenesis, and inhibit inflammation. Therefore, it is believed that this multifunctional PEEK with Sr 2+ should show great promise for clinical applications in bone repair.
研究领域:
生物医学工程
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材料科学
·
组织工程
✓ 已验证
产品关联
DOI
PubMed
Planetary Science Journal
·
2025
·Vol. 6
·期 3
·55
·
IF 4.3
Erbin Shi,Xiaojia Zeng,Jian Chen,Enming Ju,Zongcheng Ling
Calcium sulfates are widely distributed in Gale crater and Endeavour crater on Mars. However, the mole ratios of Ca2+ and SO3 in some Sr–Ba-rich sulfate veins are less than 1. This indicates that there may be additional solid solution phases on Mars, including Ca–Sr, Ba–Sr, and Ca–Ba sulfates, which, on Earth, are typically found in marine environments. In this study, we synthesized a series of Ca–Sr, Ba–Sr, and Ca–Ba sulfate solid solutions in the laboratory. These synthesized solid solutions were then characterized using various techniques, including X-ray powder diffraction (XRD), Raman, mid-infrared, and visible and near-infrared. Our results show that the XRD and Raman spectra of Ca–Sr and Ba–Sr sulfates varied with their cation contents. In particular, the linear relationships (R2 ≥ 0.98) between the mole ratios of cation ions and peak positions of {{\rm{SO}}}_{4}^{2{-}} tetrahedron (v1) in Raman spectra were obtained. The mole content of Ca2+, Sr2+, and Ba2+ can be precisely constrained in Ca–Sr, Ba–Sr, and Ca–Ba sulfate solid solution phases through linear relationships, respectively. These results are the experimental basis for analyzing in situ detection data (e.g., SHERLOC, SuperCam, and Oxia planum) and can be used to precisely constrain the mineral phases of calcium sulfate veins on Mars.
研究领域:
地质学
·
行星科学
·
光谱学
✓ 已验证
产品关联
DOI
高影响因子
ACS Catalysis
·
2024
·
IF 11.3
Baoxin Ge,Pengyang Jiang,Biyi Chen,Caijin Huang
The orbital hybridization between metal and oxygen of perovskite catalysts can lower the overpotential and enhance the oxygen evolution reaction (OER) activity. This study combines density functional theory with experiments to clarify how Sr/Fe codoping modulates orbital hybridization and enhances OER catalytic activity of LaCoO3. The as-prepared La0.50Sr0.50Co0.75Fe0.25O3 shows remarkable performance with a low overpotential of 310 mV at 10 mA cm–2 current density and a 107.03 mV dec–1 Tafel slope, outperforming most state-of-the-art perovskite-based OER electrocatalysts. The experimental results confirm that Sr/Fe codoping enhances the expansion of Co–O–Co bond angles and strengthens the covalency of the Co–O bond in LaCoO3, leading to enhanced electrocatalytic activity. Moreover, increasing Sr doping reduces the distance between the Co 3d/O 2p center and the Fermi level, decreasing the energy difference between them and enhancing the degree of orbital hybridization between Co 3d and O 2p. As the degree of Co 3d/O 2p orbital hybridization increases, a higher charge transfer was found between the active center and intermediate product, OOH, reducing the energy barrier of the rate-determining step while lowering the overpotential. This study provides thorough insight into the rational design of OER catalysts based on orbital hybridization.
研究领域:
材料科学
·
催化化学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF CATALYSIS
·
2024
·
IF 6.5
Jinni Shen,Yuhua Zhong,Jianhan Lin,Haifeng Li,Chengwei Qiu,Xu Liu,Xun Wang,Rong Hu,Jinlin Long,Xuxu Wang,Zizhong Zhang
Photocatalytic water splitting on metal oxides often faces oxygen evolution inefficiency, reflecting the complex interplay of its two half-reactions. Strategies like heterojunctions, cocatalyst loading, or noble metal nanoparticles addition have been explored to address this. Using γ-Ga 2 O 3 nanosheets as a model, we uncovered the formation of −O-O- species as the key barrier to stoichiometric splitting. To tackle this, a strategy was devised, Sr-doping to inhibit surface peroxidation. The resultant Sr-doped γ-Ga 2 O 3 (Sr-Ga 2 O 3 ) significantly improved activity and stability, achieving balanced H 2 and O 2 production under 125 W mercury lamp light. Upon further enhancement with Rh/Cr 2 O 3 cocatalyst via photoreduction, the Sr-Ga 2 O 3 /(Rh/Cr 2 O 3 ) composite demonstrated a remarkable 8.7 mmol·g −1 ·h −1 H 2 and 4.4 mmol·g −1 ·h −1 O 2 evolution rate, 8.3 times higher than γ-Ga 2 O 3 alone, with a 34.1 % quantum efficiency under 260 nm light. This represents a record performance for Ga 2 O 3 -based photocatalytic water splitting. Mechanistically, Sr doping alters surface chemistry to favor direct oxygen release. Our study elucidates molecular-level insights into non-stoichiometric splitting mechanisms and offers a potent strategy to boost metal oxide photocatalysts’ water-splitting efficiency.
研究领域:
材料科学
·
环境科学
·
能源化学
✓ 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）