Catalysts
·
2025
·Vol. 15
·期 8
·763
·
IF 4
Zhihan Li,Wenjing Yi,Qingqing Pang,Meng Zhang,Zhongyi Liu
The development of low-cost and high-efficiency oxygen evolution reaction (OER) catalysts is essential to enhance the practicality of electrochemical water splitting for green hydrogen production. Layered double hydroxides (LDHs), especially those based on nickel and cobalt, have attracted attention due to their tunable composition, abundant redox-active sites, and earth-abundant constituents. However, their application is hindered by their limited conductivity and sluggish reaction kinetics. In this study, rare-earth-element-doped NiCo LDHs were synthesized directly on nickel foam through a one-step hydrothermal approach to improve the OER activity by modulating the electronic structure and optimizing the surface morphology. Among the representative catalysts, the incorporation of Sm significantly influenced the microstructure and electronic configuration of the catalyst, as confirmed by X-ray diffraction (XRD), scanning electron microscopy (SEM), and X-ray photoelectron spectroscopy (XPS). Electrochemical tests showed that the optimized Sm-NiCo LDH achieved a low overpotential of 172 mV at 10 mA cm−2and a small Tafel slope of 84 mV dec−1in 1 M KOH, indicating an expanded electrochemically active surface and improved charge transport. Long-term stability tests further showed its durability. These findings suggest that Sm doping enhances the OER performance by increasing active site exposure and promoting efficient charge transfer, offering a promising strategy for designing rare-earth-modified, non-precious-metal-based OER catalysts.
研究领域:
电化学
·
催化
·
材料科学
·
能量转换
·
纳米技术
✓ 已验证
产品关联
DOI
高影响因子
CERAMICS INTERNATIONAL
·
2020
·
IF 3.83
Yadan Luo,Ying Li,Ning Zhang,Yushi Ding,Hongzheng Li,Gang Chen
The effects of bromine (Br) addition on electrical properties and chemical stability of Gd-doped barium cerate proton-conducting electrolyte were investigated. BaCe 0.8 Gd 0.2 O 2.8±δ Br 0.2 (BCGBr) and BaCe 0.8 Gd 0.2 O 3-α (BCG) powders with CuO as sintering aid were obtained via a solid-state reaction. The results of X-ray fluorescence (XRF) confirm that only trace amounts of Br are present in BCGBr after high temperature sintering at 1600 °C, indicating that Br addition influences stoichiometry but not directly the physicochemical properties. Nevertheless, the XRD results from the treated BCGBr and BCG electrolyte pellets show that the chemical stability of BCGBr in water and/or CO 2 -containing atmospheres is conspicuously improved. The conductivities of electrolyte sintered at 1600 °C for 10 h were investigated in various atmospheres by AC impedance technique. The total conductivity ( σ t o t ) of BCGBr under wet Ar is lower than that of BCG. Partial-conductivities components ((proton ( σ OH O · ), oxygen ion ( σ V O · · ), and hole ( σ h · )) are presented for BCGBr according to the defect structure model. The results show that the proton conductivity of BCGBr remains nearly constant over the 550–750 °C temperature range. Although σ t o t of Br-synthesized sample slightly decreases, the BCGBr exhibits a high σ OH O · (0.058 S cm −1 at 750 °C) under pH 2 O = 0.038 atm and pO 2 = 1 atm. P-type and oxygen ion conduction are dominant in an oxidative atmosphere (pO 2 = 1 atm) at 650 °C. Under low oxygen conditions (pO 2 = 10 −4 atm), BCGBr shows the behavior of mixed conduction (oxygen ions ( V O · · ) and protons ( OH O · )). Besides, the main carriers in BCGBr oxide change from OH O · to V O · · as temperature increased.
研究领域:
材料科学
·
固体化学
·
电化学
✓ 已验证
产品关联
DOI
高影响因子
CRYSTENGCOMM
·
2018
·Vol. 20
·期 19
·2705-2712
·
IF 3.304
Liangfei Ouyang,Tengfei Zheng,Liang Shen
The application of in situ powder X-ray diffraction (XRD) to monitor the polymorphic transformation and crystallization of glycine from an ionic liquid–water system is introduced. We compared the polymorphic crystallization processes of glycine in pure water, a hydrophilic ionic liquid 1-ethyl-3-methylimidazolium tetrafluoroborate ([Emim]BF4)- and a hydrophobic ionic liquid 1-butyl-3-methylimidazolium hexafluorophosphate ([Bmim]PF6)-water system. In these three cases, the mixture was predominantly composed of the metastable α-glycine, while the least stable β-glycine was only observed during the growth of crystals at room temperature and 32% humidity. The phase transformation from α- to β-glycine was clearly observed through the change in the intensity of characteristic peaks at 29.9° and 18.0° (2 theta) in the XRD patterns. In addition, the effect of the ionic liquid [Bmim]PF6 as an anti-solvent on the re-crystallization process of glycine from three commercially available brands was estimated. Also, the satisfactory reproducibility was obtained from glycine crystallization in the ionic liquid [Emim]BF4-water system in four independent experiments. Therefore, laboratory-based powder XRD analysis can not only provide dynamic information about phase transformation in situ, but can also discover the unstable or transition state in the polymorphic design and control crystallization processes by adding ionic liquids or other additives.
研究领域:
材料科学
·
晶体学
✓ 已验证
DOI
高影响因子
Device
·
2024
·
IF 0
Yujie Yang,Zhenghui Fan,Bohua He,Zhenglin Jia,Haoyu Zhao,Pan Xiong,Yong Liu,Wei Dang,Jianbo Wang,He Zheng,Xiaojia Zheng,Qianqian Lin
Solution-processed semiconductors have emerged as promising candidates for next-generation X-ray detectors, benefiting from their facile processing and tunable optoelectronic properties. However, the fabrication of thick junctions (>1 μm) is limited by poor stability and insufficient charge transport. To fill this gap, we report a sol-gel method to fabricate thick junctions based on Sb 2-x Bi x S 3 precursors. The charge carrier dynamics of antimony bismuth sulfide films were evaluated by multiple transient and steady-state techniques. It was found that Bi can modulate film morphology and thick film formation, and it also has an impact on boosting the charge transport properties. After optimization, low dark current, ultra-fast response, decent X-ray sensitivity, and high spatial resolution were achieved. The Sb 2-x Bi x S 3 -based thick junctions are stable under large bias voltage, high irradiance, and high temperature even underwater, indicating the potential for X-ray detection and imaging.
研究领域:
材料科学
·
凝聚态物理
·
核医学成像
✓ 已验证
DOI
Advanced Optical Materials
·
2025
·
IF 7.2
Chang Gu,Tao Wang,Xian Qin,Xiaogang Liu
Scintillators are essential in applications, such as homeland security, nuclear physics, and geological exploration. However, conventional scintillators often suffer from degradation under polar chemical conditions, resulting in scintillation quenching and structural decomposition. Here, a molecular engineering strategy is demonstrated to enhance scintillator stability and performance through halogen-bonded lattice reconstruction. The synthesis of a copper cluster scintillator, (X-MBA) 4 Cu 4 I 4 (X: Br or Cl, MBA: S -methylbenzylamine) is reported, where halogen bonding improves lattice symmetry and rigidity, effectively suppressing electron-phonon coupling and defect trapping. The halogenated copper clusters exhibit a photoluminescence quantum yield of ≈90%, a 13-fold increase in light yield, and an X-ray detection limit of 28.8 nGy air s −1 , outperforming halogen-free counterparts. These scintillators maintain their structural integrity and performance even after prolonged exposure to polar chemical solvents. The combination of molecular design and structural robustness enables high-resolution X-ray imaging (22 lp mm −1 ) across various chemical environments, paving the way for high-performance scintillators with exceptional durability and efficiency.
研究领域:
材料科学
·
化学工程
✓ 已验证
产品关联
DOI
高影响因子
CRYSTENGCOMM
·
2025
·
IF 2.6
Yinkun Liao,Yibo Hu,Yuanhao Zhou,Jingkun Chen,Xue Yang,Meng Gu,Kuan Ren,Jingtai Zhao,Qianli Li,He Feng
Copper halide scintillation materials with self-trapped exciton (STE) photoluminescence have attracted great interest in the field of optoelectronics. However, it is challenging for Cs3Cu2Br5 materials to achieve wider spectral emission and high spatial resolution X-ray imaging in applications. Herein, combining XRD and energy dispersive spectroscopy results, it is proved that Ag+ is doped into the Cs3Cu2Br5 lattice through an ion doping process, and PL is regulated from 460 nm to 543 nm. By density functional theory calculation, the band gap is reduced from 2.25 eV of Cs3Cu2Br5 to 1.99 eV of Cs3Cu2Br5:Ag, which is also consistent with the spectral redshift. The gradient study of the silver ion concentration from 5% to 35% shows that the best silver ion concentration is 25%. The experimental results show that the doped silver ions can improve the PL, PLE, PLQY, XEL and other properties of the material, such as the PLQY which increased from 27.38% to 90.62%. At the same time, Cs3Cu2Br5:Ag also has good stability, it can be stored in air for 30 days, and its PL intensity remains at 90.73%. The X-ray space of the Cs3Cu2Br5:Ag-UV scintillation film measured in a laboratory imaging system can reach 18.3 lp mm−1.
研究领域:
材料科学
·
光学
✓ 已验证
产品关联
DOI
高影响因子
PHYSICS AND CHEMISTRY OF MINERALS
·
2025
·Vol. 52
·期 3
·1-10
·
IF 1.6
Wang Kai,Xu Jingui,Zhang Shanrong,Zhong Qifa,Zhao Wei,Fan Dawei
The equation of state of ilmenite (FeTiO 3 ) and geikielite (MgTiO 3 ) have been investigated using in situ synchrotron X-ray diffraction at high pressures up to ~ 21.8 GPa and ~ 23.0 GPa, respectively. No phase transitions were observed within the experimental pressure ranges for both samples. The pressure-volume data were fitted using the third-order Birch-Murnaghan equation of state (EoS), yielding the following results: for FeTiO 3 , the zero-pressure unit-cell volume V 0 = 312.2(1) Å 3 , the zero-pressure bulk modulus K 0 = 165(4) GPa, and its pressure derivative K ′ 0 = 6.6(6); for MgTiO 3 , V 0 = 304.17(8) Å 3 , K 0 = 157(3) GPa, and K ′ 0 = 7.3(4). Additionally, the axial compressional behavior of FeTiO 3 and MgTiO 3 were also fitted with a linearized third-order Birch-Murnaghan EoS. The axial compressibility coefficients for FeTiO 3 along the a- and c- axes are β a = 1.43(4) × 10 − 3 GPa -1 and β c = 3.17(11) × 10 − 3 GPa -1 , respectively, with an anisotropic ratio of β a : β c = 0.45: 1.00, while β a = 1.76 (7) × 10 − 3 GPa -1 and β c = 2.61(7) × 10 − 3 GPa -1 with an anisotropic ratio of β a : β c = 0.67: 1.00 for MgTiO 3 . Both FeTiO 3 and MgTiO 3 exhibit the axial compression anisotropy, of which FeTiO 3 shows stronger axial compressibility anisotropy than MgTiO 3 . Moreover, the potential influencing factors (e.g., cation radius, crystal structure, and chemical bond strength) on the bulk moduli and the anisotropic linear compressibilities of FeTiO 3 and MgTiO 3 were further discussed.
研究领域:
地球科学
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
Journal of Materials Chemistry C
·
2024
·
IF 5.7
Mengyao Wang,Xiaofei Qing,Tianyun Du,Chuanli Wu,Xiuxun Han
The rising demand of X-ray imaging technologies in medical radiography and nondestructive detection calls for novel scintillator materials particularly with effective cost, high resolution, and low detection limit. Here we reported the investigations on the scintillating behavior of vacancy-ordered double perovskite Cs2SnCl6 fabricated via a simple co-precipitation process. By introducing Te4+ doping, an intense yellow emission was achieved upon X-ray radiation. Combined with PDMS, flexible imaging screens with tunable size and thickness could be obtained, and demonstrated a high resolution of 20 LP mm-1, low detection limit of 132 nGyair/s, and high X-ray radiation endurance. Its excellent flexibility enables clear and less vignetting X-ray imaging for nonplanar subjects. The findings open a new avenue towards versatile applications for Sn-based vacancy-ordered double perovskites other than visible and near-infrared emissions.
研究领域:
材料科学
·
医学影像学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2025
·
IF 6.3
Wei Zheng,Lingyan Xu,Yingming Wang,Chongqi Liu,Lu Liang,Zhentao Qin,Lixiang Lian,Yanyan Lei,Qinzeng Hu,Wanqi Jie
Organic semiconductor single crystals with tissue-equivalent properties present promising advantages for detecting ionizing radiation, particularly X-rays. However, few organic semiconductor materials can exhibit excellent radiation detection performance. In this study, we focus on 9,10-bis(phenylethynyl)anthracene (BPEA) single crystals with two different crystalline phases (α-BPEA and β-BPEA). A slow solution evaporation method is employed to grow centimeter-sized α-BPEA and β-BPEA crystals with high quality. The sandwich-type α-BPEA detector demonstrates exceptional ionizing radiation detection capabilities, with resistivity of 2.72 × 10 12 Ω cm and hole mobility of 2.93 cm 2 V −1 s −1 . The α-BPEA detector also achieves rapid detection of 5.49 MeV α-particles with detection time of 7 ms. The energy resolution and hole mobility-lifetime product are calculated to be 29.93 % and 2.51 × 10 −5 cm 2 V −1 , respectively, marking the best α-particle energy spectrum performance among current organic semiconductor detectors. The α-BPEA detector exhibits X-ray detection sensitivity as high as 451.37 μC Gy air −1 cm −2 and detection of limit as low as 26.28 nGy air s −1 . The α-BPEA detector also demonstrates good operational stability and outstanding imaging capabilities, achieving a spatial resolution of 1.6 lp mm −1 . The BPEA single crystals suggest significant potential for direct ionizing radiation detection and broader optoelectronic applications.
研究领域:
材料科学
·
辐射探测
·
有机半导体
✓ 已验证
产品关联
DOI
高影响因子
BULLETIN OF THE CHEMICAL SOCIETY OF ETHIOPIA
·
2014
·Vol. 28
·期 3
·409-414
·
IF 0.491
G-H. Sheng,Z-L. You,H-L. Zhu
Reaction of [MoO2(acac)2] (where acac = acetylacetonate) with N’-(2-hydroxy-4-diethaylaminobenzylidene)-4-hydroxybenzohydrazide (H2L) in methanol afforded a methanol-coordinated mononuclear molybdenum(VI) oxo complex, [MoO2L(MeOH)]. Crystal and molecular structure of the complex were determined by single crystal X-ray diffraction method. The complex was further characterized by elemental analysis and FT-IR spectra. Single crystal X-ray structural studies indicate that the hydrazone ligand coordinates to the MoO2 core through enolate oxygen, phenolate oxygen and azomethine nitrogen. The Mo atom in the complex is in octahedral coordination. Thermal stability of the complex has also been studied. KEY WORDS: Molybdenum complex, Hydrazone ligand, Crystal structure, X-ray diffraction, Thermal property Bull. Chem. Soc. Ethiop. 2014, 28(3), 409-414.DOI: http://dx.doi.org/10.4314/bcse.v28i3.10
研究领域:
无机化学
·
材料科学
✓ 已验证
DOI
高影响因子
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
·
2023
·Vol. 34
·期 6
·1-9
·
IF 2.8
Chen Wei,Sun Hui,Jin Yingrong,Yang Hualin,He Yi,Zhu Xinghua
Cs 3 Bi 2 I 6 Br 3 perovskite is one of the bismuth iodide family compounds. Because it contains no toxic lead, and has high stability in air and humidity, endowing a potential application prospects in photoelectric and radiation detectors. Herein, the Cs 3 Bi 2 I 6 Br 3 single crystal (Φ13 × 65 mm 3 ) with a (001) preferred direction was grown by using the melt method with solvent-synthesized polycrystalline particles, and the thin single wafer with a thickness up to 0.95 mm was obtained. The as-grown single crystal possesses high infrared transmittance of up to 70% in the range from 400 to 4000 cm −1 and an optical band gap of about 2.03 eV estimated from the visible absorption curve. A highly intrinsic resistivity 2.3 × 10 10 Ω·cm and a dielectric constant about 10 were obtained from the electrical performance parameter measurements. The X-ray sensitivity of the X-ray detector is 55.62 µC/Gy air /cm 2 (incident dose rate 0.24 mGy/s), as well as the signal-to-noise ratio, is up to 301. These results indicate Cs 3 Bi 2 I 6 Br 3 single crystals are a potential material for X-ray detection.
研究领域:
材料科学
·
光电检测
✓ 已验证
产品关联
DOI
高影响因子
Journal of Materials Chemistry C
·
2022
·Vol. 10
·期 25
·9636-9643
·
IF 8.067
Kuangnan Lyu,Enhai Song,Zhiguo Xia
Doping engineering in lead-free all-inorganic halide perovskites plays an important role in their performance modulation for emerging photonics applications. Benefiting from the weak electron phonon coupling effect, and the distorted site occupied by Eu2+, chloride perovskite phosphor KCaCl3 : Eu2+ is prepared and demonstrated herein, which shows high-efficiency (internal quantum efficiency, IQE = 96.1%) blue emission peaking at ∼430 nm as well as good thermal stability (74%@ 423 K of the initial integrated intensity at 298 K). This phosphor also has high radiation luminescence intensity (∼7.1 times that of commercial Lu3Al5O12 : Ce3+) upon X-ray excitation and a low detection limit (483.5 nGyair s−1), exhibiting good potential in X-ray detection and imaging. This work provides new insights into the design of Eu2+ activated halide perovskite luminescent materials for versatile optoelectronic applications.
研究领域:
材料科学
·
光学工程
✓ 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）