Advanced Energy Materials
·
2022
·Vol. 12
·期 22
·2200392
·
IF 29.698
Peng Zhong,Kazuaki Toyoura,Lulu Jiang,Lubing Chen,Sara Adeeba Ismail,Naoyuki Hatada,Truls Norby,Donglin Han
A significant hydration and protonic conduction in La 2 NiO 4+ δ -based Ruddlesden–Popper (RP) oxides will enable their use as positrode materials in proton ceramic electrochemical cells (PCECs). Unlike perovskite electrolytes and positrode materials, where protons reside and jump on regular oxide ions, RP oxides such as La 2 NiO 4+ δ may contain oxygen interstitials and offer the possibility that protons locate on and migrate by help of these, suggesting a mechanism by which positrodes may operate by triple conduction. Here, theoretical calculations that support proton migration between interstitial oxide ions in the rock-salt layer via unshared oxide ions in the perovskite layer are reported. Furthermore, water contents of pristine La 2 NiO 4+ δ and La 2- x A x NiO 4+ δ ( A = Ca, Sr, Ba) are reported, showing that hydration increases with the level and basicity of the dopant. Hebb-Wagner blocking electrode measurements show significant partial protonic conductivity in all samples. The effects of doping on hydration and of p H 2 O on the p-type conductivity suggest that protons reside primarily on structural oxide ion, but a role of interstitial oxide ions for dissolution and migration of protons cannot be ruled out in cases with oxygen excess. The results are instructive for further studies and optimization of RP oxides as potential positrode materials for PCECs.
研究领域:
材料科学
·
电化学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF MATERIALS SCIENCE & TECHNOLOGY
·
2022
·
IF 10.319
Jia Liu,Cuiying Ma,Lianli Wang,Ke Ren,Hongpei Ran,Danni Feng,Huiling Du,Yiguang Wang
Single-phase Ba(Ti 0.2 Zr 0.2 Sn 0.2 Hf 0.2 Ce 0.2 )O 3 (BTZSHC) high-entropy ceramics (HECs) with the perovskite structure were successfully prepared via the sol-gel method. The results reveal that the as-prepared ceramics exhibit a single cubic phase belonging to the P m 3 ¯ m space group. The high entropy is the driving force of the formation of single-phase ceramics. A larger entropy (Δ S mix ) and a negative enthalpy (Δ H mix ) are conducive to the formation of single-phase compounds. Herein, Δ S mix = 0.323 R mole –1 and Δ H mix = −43.88 kJ/mol. The sluggish-diffusion effect ensures the thermal stability of high-entropy systems. Dielectric measurements reveal that the as-prepared BTZSHC high-entropy ceramics are relaxor ferroelectrics, and the degree of relaxor ( γ ) is 1.9. The relaxor behavior of the as-prepared ceramics can be ascribed to the relaxation and thermal evolution of their polar units (PUs). The findings of this work provide a theoretical basis and technical support for the preparation of single-phase high-entropy ceramics.
研究领域:
材料科学
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陶瓷
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介电材料
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高熵材料
✓ 已验证
产品关联
DOI
高影响因子
INORGANIC CHEMISTRY
·
2022
·
IF 5.436
He-Di Yang,Sheng-Hua Zhou,Mao-Yin Ran,Xin-Tao Wu,Hua Lin,Qi-Long Zhu
Oxychalcogenides have gained widespread attention as promising infrared nonlinear optical (IR-NLO) candidates. However, high-performance oxychalcogenides have rarely been reported in the ultraviolet (UV) region owing to the low energy gaps (Eg < 4.0 eV). Herein, two non-centrosymmetric (NCS) oxychalcogenides with one-dimensional (1D) chain structures and wide Eg (>4.3 eV), namely, AEGeOS2 (AE = Sr and Ba), have been discovered by combined experiments and theory calculations as a new source of UV-NLO materials. Significantly, they exhibit excellent comprehensive performance comparable to the commercial UV-NLO material KH2PO4 (KDP), including large phase-matching ranges (>380 nm), sufficient second harmonic generation intensities (0.7–1.1 × KDP), high laser-induced damage thresholds (1.2 × KDP), wide transparent regions (0.26–12.2 μm), and good thermal stability (up to 1100 K). Moreover, systematic structure–activity relationship analysis illustrates that the 1D homochiral helical [GeOS2]2– chains composed of heteroanionic [GeS2O2] units make major contribution to the desirable UV-NLO performance. This work makes the two compounds shine out as new energy in the UV-NLO field and offers a new perspective for the exploration of structure-driven functional oxychalcogenides.
研究领域:
材料科学
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物理化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
ACS Applied Materials & Interfaces
·
2023
·
IF 9.5
Ruiwen Li,Jintao Yan,Bin Feng,Min Sun,Chuanfan Ding,Hao Shen,Jianhua Zhu,Shaoning Yu
The widespread use of antibiotics has made multidrug-resistant bacteria (MDRB) one of the greatest threats toward global health. Current conventional microbial detection methods are usually time-consuming, labor-intensive, expensive, and unable to detect low concentrations of bacteria, which cause great difficulties in clinical diagnosis and treatment. Herein, we constructed a versatile biosensing platform on the basis of boric acid-functionalized porous framework composites (MOF@COF-BA), which were able to realize highly efficient and sensitive label-free MDRB detection via fluorescence. In this design, MDRB were captured using aptamer-coated nanoparticles and the fluorescent probe MOF@COF-BA was tightly anchored onto the surface of MDRB due to interactions between boric acid groups and glycolipids on bacteria cells. Benefitting from the remarkable fluorescence performance of MOF@COF-BA, rapid and specific detection of MDRB, such as methicillin-resistant Staphylococcus aureus (MRSA) and Acinetobacter baumannii (AB), was realized with a detection range of 20–108 CFU/mL (for both) and limits of detection of 7 CFU/mL (MRSA) and 5 CFU/mL (AB). The feasibility of using the developed platform to selectively detect MRSA and AB from complex urine, human serum, and cerebrospinal fluid samples was also demonstrated. This work provides a promising strategy for accurate MDRB diagnosis, avoiding serious infection using rational antibiotic therapy.
研究领域:
微生物学
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生物医学工程
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临床诊断
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
·
2020
·Vol. 31
·期 7
·5492-5498
·
IF 2.22
Xu Lei,Xu Yuan
Ba(Zr x Ti 1− x )O 3 ceramics ( x = 0.15, 0.2, 0.25, 0.3) were prepared with solid-state reaction method. The ratio of Zr/Ti influences the crystal structure, micromorphology, ferroelectric and dielectric properties of BZT ceramics, which were characterized, respectively, by X-ray diffraction, scanning electron microscope, ferroelectric test system and dielectric test system. The X-ray diffraction patterns show that the zirconium titanate ceramic samples adopt cubic phase structure and no secondary phase. As the Zr 4+ content increases, the lattice constant increases and the grain size decreases. BZT ceramic sample with 15% zirconium content has the highest dielectric constant. As the Zr 4+ content increases, the dielectric constant is gradually decreased, and Curie temperature dropped from 334 to 226 K. The sample has the largest remanent polarization, when the zirconium ion content is 15%. Subsequently, the remanent polarization is reduced as the zirconium ion content increases.
研究领域:
材料科学
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无机非金属材料
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功能陶瓷
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铁电材料
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介电材料
✓ 已验证
DOI
高影响因子
ACS Applied Materials & Interfaces
·
2022
·
IF 10.383
Manyi Xie,Changkun Cai,Xiangjun Liu,Ke Xue,Yuxin Chen,Jun Peng,Jinxiao Bao,Shengli An,Hong Yang
As a device for direct conversion of chemical energy into electrical energy, the solid oxide fuel cell (SOFC) contributes positively to the sustainable development strategy. However, the commercialization of fuel cells is still impeded by severe cathode degradation caused by its limited stability at operating temperatures and being prone to Cr-poisoning from Cr-containing alloy interconnectors commonly used in these cells. This paper reports the development of a high-durability Ba-doped LSCF(La0.6Sr0.4Co0.2Fe0.8O3−δ) cathode material under realistic fuel cell operating conditions in the presence of the Cr alloy. In particular, when tested in a symmetrical cell constructed of Ba-doped LSCF, the polarization resistance of the cell remains very low at 0.06 Ω cm2 after being tested at 800 °C for 120 h exposed to Cr in 3% humidified air. In contrast, for the undoped LSCF under the same testing conditions, the polarization resistance of the cell increases ∼10 times from 0.22 Ω cm2 of the pristine cell to 2.18 Ω cm2 after Cr-exposure testing. Furthermore, when tested in an anode-supported complete cell as a cathode under typical SOFC operation conditions at 750 °C, the cell with the Ba-doped LSCF cathode displays significantly low degradation rates of 0.00056% h–1 (without Cr) and 0.00310% h–1 (with Cr); both are much lower than that of the cell using the undoped LSCF cathode (0.00124% h–1 without Cr and 0.01082% h–1 with Cr). This enhanced durability and Cr-tolerance exhibited by the Ba-doped LSCF cathode stem from its higher crystal structure stability and improved chemical resistance compared to undoped LSCF.
研究领域:
能源材料
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电化学
·
燃料电池技术
·
材料科学
✓ 已验证
DOI
高影响因子
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
·
2021
·
IF 5.302
Feihu Li,Ying Tang,Jie Li,Weishuang Fang,Laiyuan Ao,Yu Wang,Xiangguang Zhao,Liang Fang
AGe 4 O 9 (A = Ba, Sr) ceramics with hexagonal structure were fabricated by solid-phase reaction. BaGe 4 O 9 sintered at 1060 °C had low ε r ∼9.8, high Q × f ∼78,400 GHz and τ f ∼ -44.2 ppm/°C, whilst SrGe 4 O 9 sintered at 1100 °C exhibited relatively high ε r ∼11.2, low Q × f ∼62,500 GHz and near-zero τ f ∼ -11.7 ppm/°C. The τ f of SrGe 4 O 9 was nearer to zero than that of BaGe 4 O 9 due to the smaller τ ε value and the smaller distortion of the [GeO 6 ] octahedrons. The ‘rattling’ cations at A-site contribute to comparatively high ε r , low Q × f and near-zero τ f values in Sr 1- x Ba x Ge 4 O 9 ceramics. This work presents a new idea of adjusting the microwave dielectric performance (MDP) of ceramics by changing the strength of the rattling effect at A-site.
研究领域:
材料科学
·
无机化学
✓ 已验证
DOI
高影响因子
INORGANIC CHEMISTRY
·
2026
·
IF 4.6
Yu Qiu,Haonan Liu,Yujie Zhang,Hongping Wu,Hongwei Yu
The rational design of noncentrosymmetric (NCS) borates remains challenging because subtle variations in the arrangement of microscopic functional units can profoundly influence macroscopic symmetry and nonlinear optical (NLO) behavior. Herein, we report two new alkaline-earth borate fluorides, Sr2Mg3(BO3)2F4 and Ba2Mg3(BO3)2F4, featuring identical [BO3] triangles and Mg-O/F polyhedra, but crystallizing in distinct space groups, namely P1̅ for Sr2Mg3(BO3)2F4 and Fdd2 for Ba2Mg3(BO3)2F4. Structural analysis indicates that replacing Sr2+ with the larger Ba2+ cation modifies the local coordination environment around the alkaline-earth cation and the distortion of the Mg-O/F framework, which results in the reorganization of [BO3] units from an antiparallel arrangement to a cooperative polar alignment. Property measurements indicate that Ba2Mg3(BO3)2F4 exhibits a significant second-harmonic generation response, suitable birefringence, and a short UV cutoff edge down to 190 nm. A structure-property relationship study confirms that the [BO3] units are the primary source of the optical response. This work not only provides a promising deep-ultraviolet NLO crystal but also reveals a cation-mediated symmetry engineering strategy to design NCS borates.
✓ 已验证
DOI
高影响因子
Small
·
2023
·Vol. 20
·期 14
·2308279
·
IF 13.3
Weishang Jia,Junxian Chen,Zihao Wang,Aijun Zhou,Yong-Sheng Hu,Jingze Li
The development and application of lithium (Li) anode is hindered by volumetric variation, dendritic Li growth, and parasitic reactions. Herein, a dual-phase Li-barium (Ba) alloy with self-assembled microchannels array is synthesized through a one-step thermal fusion method to investigate the inhibition effect of lithiophilic composite porous array on Li dendrites. The Li-rich Li-Ba alloy (BaLi24) as composite Li electrode exhibits an ordered porous structure of BaLi 4 intermetallic compound after delithiation, which acts as a built-in 3D current collector during Li plating/striping process. Furthermore, the lithiophilic BaLi 4 alloy scaffold is a mixed conductor, featuring with Li + ions diffusion capability, which can efficiently transport the reduced Li to the interior of the electrode structure. This unique top-down growth mode can effectively prohibit Li dendrites growth and improve the space utilization of 3D electrode structure. The spin-polarized density functional theory (DFT) calculations suggest that the absorption capability of BaLi 4 benefits the deposition of Li metal. As a result, the cell performance with the dual-phase Li-Ba alloy anode is significantly improved.
研究领域:
材料科学
·
储能
·
电化学
·
电池技术
✓ 已验证
DOI
高影响因子
PHYSICAL CHEMISTRY CHEMICAL PHYSICS
·
2016
·Vol. 18
·期 31
·21491-21499
·
IF 4.449
Meilin Lv,Yawei Wang,Lingwei Lu,Ruinan Wang,Shuang Ni,Gang Liu,Xiaoxiang Xu
The crystal structure of photocatalysts generally plays a pivotal role in controlling their electronic structure as well as catalytic performance. In this work, a series of double perovskite compounds A2InTaO6 (A = Sr or Ba) and their Ni doped counterparts were investigated with the aim of understanding how doping and structural modification will affect their photocatalytic activity. Our results show that Ni doping is effective in improving the optical absorption of these wide band gap semiconductors and accommodating the Sr cation in the A sites leads to severe structural distortion, i.e. the In(Ni)–O–Ta bond angle deviates largely from 180°. A better photocatalytic performance was observed for samples with Ni doping and Ba in the A sites. The best photocatalytic hydrogen production rate recorded was ∼293.6 μmol h−1 for Ba2In0.9Ni0.1TaO6 under full range irradiation, corresponding to an apparent quantum efficiency of 2.75%. DFT calculations reveal the role of Ni doping by forming additional spin-polarized bands inside the intrinsic band gap of the native perovskite. The better photocatalytic activity of Ba2In0.9Ni0.1TaO6 can then be understood as a result of a reduced band gap as well as a linear In(Ni)–O–Ta bond arrangement that is favorable for the strong metal–oxygen–metal interactions.
研究领域:
材料科学
·
光催化
·
钙钛矿化学
·
能源材料
·
固态化学
✓ 已验证
DOI
高影响因子
APPLIED SURFACE SCIENCE
·
2012
·
IF 2.103
Yang Xiaowei,Zeng Yanwei,Cai Tongxiang,Hu Zhenxing
The polystyrene shells have been successfully grown on the barium strontium titanate (BST) nanocrystals, which were synthesized by microwave-activated glycothermal method, via a solvent-free surface-initiated atom transfer radical polymerization (SI-ATRP) after the 2-bromo-2-methylpropionic acid molecules (Br-MPA) were anchored at the surface of BST nanocrystals through ligand exchange with hydroxyl groups on their surfaces. These surface modified BST nanocrystals can then be perfectly dispersed in styrene monomer and act as macroinitiators for ATRP to yield BST@PS core-shell structured nanoparticles, which endow the BST nanocrystals with exceptionally good dispersibility and stability in hydrophobic solvents. The BST@PS core-shell structures were characterized by X-ray diffraction (XRD) technique and transmission electron microscopy (TEM). Fourier transform infrared spectroscopy (FT-IR), Raman spectroscopy (Raman), differential scanning calorimetry (DSC) and gel permeation chromatography were also employed to probe the Br-MPA and PS on the BST nanocrystals. It has been shown that after the BST nanocrystals are surface-modified with Br-MPA, the polymerization of styrene can steadily occur at the surface of BST nanocrystals to form a uniform polystyrene shell and its thickness can reach ∼10 nm when the polymerization reaction is extended to 36 h, while no changes are found to take place with the BST nanocrystals. Compared with typical high molecular weight PS ( M n = 6700), the as-obtained PS possess a relatively low molecular weight ( M n = 5473) and a lower glass transition temperature ( T g ∼ 93 °C). The research results demonstrate a viable strategy for the preparation of polymer-coated functional metal oxides nanocrystals, potentially useful in biological and nanoelectronic applications.
研究领域:
材料科学
·
化学工程
✓ 已验证
DOI
高影响因子
Materials Science & Engineering C-Materials for Biological Applications
·
2015
·
IF 3.088
Zhao Chen,Xiaowen Sun,Yan Shen,Hong Ni,Shigan Chai,Qichao Zou,Xiuhua Zhang,Jinzhi Zhang
In this study, a stable antibacterial poly(styrene-co-butyl acrylate) (poly(St-co-BA)) nano-latex was prepared in the presence of a dioctyldimethylammonium chloride (D821)-CTAB mixed surfactant and a novel bis -unsaturated Gemini comonomer (i.e., α, ω -hexanediyl bis (dimethyl methacrylamidopropyl ammonium bromide) (G MAP-6-MAP )) using a feasible and mild semicontinuous technology. The effects of the emulsifiers and G MAP-6-MAP on the properties and antibacterial activities of poly(St-co-BA) coatings were systematically investigated. The results indicate that an optimal monodispersed stable nanoemulsion was obtained with Dw = 58.24 nm and PDI = 0.026, the emulsifier amount was 3.75% (D821/CTAB = 4:1), and the G MAP-6-MAP amount was 1.5%. CTAB improved the stabilities and antibacterial activities of the poly(St-co-BA) nanoemulsions. The incorporation of G MAP-6-MAP into poly(St-co-BA) can enhance the antibacterial activity, improve the thermal stability of latex films, as well as the consistency among the chain segments, and decrease the roughness of latex films. This nanoemulsion exhibits effective antibacterial activity with MBCs of 2 μg·mL − 1 against Staphylococcus aureus and 16 μg·mL − 1 against Escherichia coli . The sterilization rates of the optimized latex film reached 100% against S. aureus and 98.74% against E . coli , which indicated that this latex film could be utilized as an outstanding antibacterial coating.
研究领域:
材料科学
·
生物医学工程
✓ 已验证
DOI
PubMed
高影响因子
危险品化学品经营许可证（带存储）