Environmental Science-Nano
·
2026
·
IF 5.1
Hui Dong,Bo Su,YanXi Cheng,Saikat Ghosh,Nihar Ranjan Pradhan,Bo Pan,Baoshan Xing
The co-assembly of humic acid (HA)-coated maghemite nanoparticles (H-GFeNPs) and bovine serum albumin (BSA)-modified maghemite nanoparticles (B-GFeNPs) and sequestration of NO₃⁻ within the colloidal crystals were investigated. The π-π interaction between aromatic moieties of the adsorbed BSA and HA controlled the co-assembly process. The 1:1 binary mixture of H-GFeNPs and B-GFeNPs at pH 4 showed screw dislocation-driven growth of colloidal crystals, especially at higher concentrations of NO₃⁻. But, at pH 7, the binary mixture in the presence of NO₃⁻ produced spherical dendritic nanostructures and hierarchical growth of dendrites. However, at higher levels of NO3-, the binary mixture produced 2D cubic lattice and rocksalt-like 3D colloidal crystals. In addition, we also detected the growth of dendrites, ubiquitous in rocksalt-type crystal growth, specifically in an unsaturated environment. The binding of NO₃⁻ to the hydrophobic and positively charged residues of the protein, supplemented by the loss of α-helix and reduced radius of gyration (Rg), possibly favored crystal growth. Signatures of the NO3- specific Raman bands within the colloidal crystals discerned the sequestration of the highly mobile contaminant ion within the crystalline domain. Therefore, potentially diminishes the atmospheric emission of high global warming potential (GWP) oxides of N produced via denitrification.
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ADVANCED POWDER TECHNOLOGY
·
2018
·Vol. 30
·期 2
·302-310
·
IF 2.943
Bingbing Liu,Yuanbo Zhang,Jia Wang,Juan Wang,Zijian Su,Guanghui Li,Tao Jiang
Investigations on the MnO 2 -Fe 2 O 3 system roasted in air has been reported in our previous work. This study further investigated the MnO 2 -Fe 2 O 3 system roasted under CO-CO 2 atmosphere. Extensive investigations were concentrated on the reduction of simplex iron oxides or manganese oxides, and little attention were paid on the reduction of MnO 2 -Fe 2 O 3 system regarding to interactive reactions between them. In this work, it was found that spinel-type Mn x Fe 3−x O 4 with high magnetism formed easily under CO-CO 2 atmosphere. The reduction and thermodynamic analyses of pure MnFe 2 O 4 were also researched to better understand the reduction behaviors of MnO 2 -Fe 2 O 3 system. Phase study showed that a series of Mn-Fe composite oxides, including Mn x Fe 3−x O 4 and (MnO) y (FeO) 1−y , generated during the reduction of MnO 2 -Fe 2 O 3 system. Mn x Fe 3−x O 4 was readily generated under CO content of 2.5–25 vol% at 1000 °C. With further increase of CO content, Mn x Fe 3−x O 4 was reduced to (MnO) y (FeO) 1−y and then to MnO and metallic iron. Reduction of manganese oxides, iron oxides and manganese ferrites happened concurrently during the reduction of MnO 2 -Fe 2 O 3 system. And the reduction of MnO 2 , Fe 2 O 3 , Fe 3 O 4 and MnFe 2 O 4 were compared by TG and thermodynamic analyses. In addition, the morphology evolution and magnetism change of the MnO 2 -Fe 2 O 3 system reduced under different CO contents were also studied.
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OPTICAL MATERIALS
·
2016
·
IF 2.183
Liangjie Pan,Benxue Jiang,Jintai Fan,Pande Zhang,Xiaojian Mao,Long Zhang
Aluminum Garnet (LuAG) precursors were co-precipitated by using ethanol–water as the precipitant solvent. The effect of different volume ratios of ethanol to water ( R ) on the preparation of pure-phase LuAG powders has been mainly studied. The evolution of phase, composition and micro-structure of the as-synthesized LuAG powders were characterized by TG/DTA, FTIR , XRD , BET, and SEM. The BET-equivalent diameter of LuAG nano particles increased with R . The ethanol–water solvent does not change the main composition of the LuAG precursors, but has great influence on the morphology of the final LuAG nano particles . Uniformly dispersed LuAG powders calcined at 1200 °C for 3 h with a particle size of approximately 120 nm were obtained by using ethanol–water solvent with proper R = 1. The mechanism of ethanol in the preparation process was discussed.
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CURRENT APPLIED PHYSICS
·
2020
·
IF 2.281
Yanqun Chen,Chao Wang,Zheng Ma,Lanwei Li,Shuyao Li,Jianli Wang
n-type Mg 3 Sb 2 –Mg 3 Bi 2 alloy shows as a potential new thermoelectric material (TE) and has been widely researched recently. The pure phase n-type Mg 3 · 20 (Sb 0·3 Bi 0.7 ) 1.99 Te 0.01 were prepared by adjusting Mg content with the Bi impurity phase being effectively suppressed. Then, Co element was doped into the pure phase and the electrical conductivity of samples were improved. With a high power factor of 20.3 μ W cm −1 K −2 for Mg 3·185 Co 0·015 (Sb 0·3 Bi 0.7 ) 1.99 Te 0.01 at 525 K. Additionally, it was found that the phonon scattering is enhanced due to the larger atomic mass of Co comparing to Mg and the lattice thermal conductivity is reduced. As a result, a high ZT value of ~ 1.03 at 525 K is achieved for the Mg 3·185 Co 0·015 (Sb 0·3 Bi 0.7 ) 1.99 Te 0.01 .
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高影响因子
MATERIALS RESEARCH BULLETIN
·
2016
·
IF 2.435
Weihao Ye,Xiaotang Liu,Qiying Huang,Zhiping Zhou,Guangqi Hu
Europium doped Calcium fluoride (CaF 2 :Eu 2+ ) nanoparticles have been synthesized by co-precipitation method using different surfactants, in which anhydrous ethanol was used as solvent and the nanoparticles was sintered in air. The self-reduction was observed in the as-prepared CaF 2 :Eu 2+ nanoparticles and can be explained by charge compensation model based on the substitution. Scanning electron microscope (SEM) and X-ray power diffraction (XRD) showed that the nanoparticles were about 50 nm⿿1 μm and in a single phase. A broad emission centered at 425 nm due to Eu 2+ 4f 7 ⿿4f 6 5d 1 transition has been observed with excitation bands between 337 and 385 nm by the fluorescence spectrometer. The corresponding excitation spectra showed a wide excitation range in the violet region due to 4f 7 ( 8 S 7/2 ) ⿿ 4f 6 5d 1 (t 2g ) The luminescent properties of the phosphor was thoroughly examined. Furthermore, the effect of using different surfactants on the sizes of CaF 2 :Eu 2+ nanoparticles, related mechanisms was also investigated.
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OPTICAL MATERIALS
·
2018
·
IF 2.32
Renping Cao,Wudi Wang,Jinlong Zhang,Yujiao Ye,Ting Chen,Siling Guo,Fen Xiao,Zhiyang Luo
Sr 2 Mg 3 P 4 O 15 :R (R = Bi 3+ , Mn 2+ , and Bi 3+ /Mn 2+ ) phosphors are synthesized by a solid-state reaction method in air. Sr 2 Mg 3 P 4 O 15 :Bi 3+ phosphor with excitation 380 nm shows blue light and its emission band peaking at ∼445 nm is observed. Under excitation at 355 and 416 nm, Sr 2 Mg 3 P 4 O 15 :Mn 2+ phosphor shows red emission with a single broad emission band peaking at ∼630 nm in the range of 500–800 nm owing to the 4 T 1 (G) → 6 A 1 transition of the Mn 2+ ion. The optimal Mn 2+ ion content in Sr 2 Mg 3 P 4 O 15 :Mn 2+ phosphor is ∼0.05 and the lifetime of Sr 2 Mg 2.95 P 4 O 15 :0.05Mn 2+ phosphor is ∼6.17 ms. After Bi 3+ ion is co-doped, emission intensity of Sr 2 Mg 3 P 4 O 15 :Mn 2+ phosphor can be enhanced obviously due to energy transfer (ET) from Bi 3+ to Mn 2+ , which is confirmed by the luminescence properties and lifetimes of Sr 2 Mg 3-x P 4 O 15 :Bi 3+ , Mn 2+ phosphor. Luminous mechanism and ET process of Sr 2 Mg 3-x P 4 O 15 :Bi 3+ , Mn 2+ phosphor are explained by the simple energy level diagram of Bi 3+ and Mn 2+ ions.
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高影响因子
APPLIED PHYSICS A-MATERIALS SCIENCE & PROCESSING
·
2019
·Vol. 125
·期 3
·158
·
IF 1.784
Gao Dong-Sheng,Gao Xiang-Dong,Wu Yong-Qing,Zhang Tong-Tong,Yang Jing-Nan,Li Xiao-Min
Co doped BaSnO 3 films [BaSn 1 − x Co x O 3 (0 ≤ x ≤ 0.50), i.e., BSCO] have been grown on MgO single-crystal substrates via pulsed laser deposition. Effects of the Co-doping level on the crystallinity, the microstructure, and optical properties of the BSCO films are investigated. All the BSCO films are of high crystallinity and grown epitaxially on MgO substrates. The lattice parameter of the (200) plane drops linearly with the increase of the ‘ x ’ value. The Co doping is found to increase the film roughness and the grain size, and a RMS roughness of 8.33 nm and grain size up to 100 nm are observed in the film with x = 0.50. The low Co-doping level ( x = 0.05, 0.1) has slight anti-reflection effects on the incident visible light, and the Co-doping level higher than 0.2 reduces the optical transmittance significantly. The optical bandgap shows a first-rising then falling trend with the increase of the Co content, and the lowest bandgap of 1.94 eV is realized in the BSCO film with x = 0.50.
研究领域:
材料科学
·
凝聚态物理
·
薄膜制备
·
光学材料
·
功能氧化物
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Journal of Materials Chemistry A
·
2017
·Vol. 5
·期 27
·14278-14285
·
IF 8.867
Haibo Tang,Xinlong Tian,Junming Luo,Jianhuang Zeng,Yingwei Li,Huiyu Song,Shijun Liao
Transition metal nitrides have recently attracted significant interest as electrocatalysts for the oxygen reduction reaction (ORR) owing to their low electrical resistance and good corrosion resistance. In this paper, we describe the preparation of a Nb-based binary nitride material with a porous nanogrid morphology/structure. The catalyst exhibited good catalytic activity and high stability towards oxygen reduction. We also intensively investigated the effect that doping with a second transition metal had on the performance of the catalyst. We found that the ORR activity of NbN could be enhanced significantly by enriching the d electrons of Nb through doping with a second transition metal, and that doping with cobalt resulted in the best improvement. Our optimal catalyst, Nb0.95Co0.05N, had an ORR activity ∼4.6 times that of NbN (current density @ 0.6 V vs. the RHE). XPS results revealed that Co doping increased the proportion of Nb in a low-valence state, which may be one of the most important reasons for the enhanced performance. Another important reason is the high surface area resulting from the porous nanogrid morphology. As transition metal doping is an attractive way to enhance the activity of nitride catalysts, our work may provide an effective pathway to achieve this.
研究领域:
材料科学
·
电化学
·
纳米科技
·
催化化学
·
能源材料
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高影响因子
JOURNAL OF LUMINESCENCE
·
2021
·
IF 3.599
Chenwei Xu,Chenxia Li,Degang Deng,Hua Yu,Le Wang,Changyu Shen,Xufeng Jing,Shiqing Xu
A series of new double perovskite structure CaLaMgTaO 6 : Bi 3+ , Eu 3+ phosphors were synthesized by high-temperature solid-phase method. The crystal structure, luminescence characteristics and temperature sensing performance have been systematically studied. The substitution rule of Bi 3+ in CLMT and its luminescence characteristics are described. The decay curve of Bi 3+ further proves the existence of an energy transfer from Bi 3+ to Eu 3+ . They have different thermal quenching behaviors, and their fluorescence intensity ratio (FIR) parameter has tremendous temperature sensing performance. Under 329 nm ultraviolet excitation, the emission peaks at 408 nm and 614 nm are used as the reference signal, the largest absolute sensitivity is 0.0127 K −1 at 573 K, and the maximum relative sensitivity is 1.33%K −1 at 483 K. This indicates that CaLaMgTaO 6 : Bi 3+ , Eu 3+ is a material with excellent temperature measurement performance and applicability in non-contact optical thermometers.
研究领域:
材料科学
·
发光材料
·
光学传感
·
无机化学
·
功能材料
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高影响因子
CHEMISTRY-A EUROPEAN JOURNAL
·
2019
·Vol. 25
·期 33
·7896-7902
·
IF 5.16
Xuejiao Yang,Yuefei Wang,Wei Qi,Bohao Yang,Xiao Liu,Lei Zhang,Jiangyue Liu,Rongxin Su,Zhimin He
Inspired by natural enzymes, hierarchical catalytic supramolecular nanostructures were developed by the co-assembly of hemin and glucose oxidase (or Au NPs) with the photosensitive ferrocene–tyrosine (Fc-Y) molecule. Illuminated by white light, the Fc-Y molecules are polymerized and co-assemble with hemin into truncated polyhedrons. The Au NPs grew in situ at the surface of the co-assembled polyhedrons, achieving ordered supramolecular nanostructures. Because the Au NPs can serve as an artificial glucose oxidase and the hemin could act as a peroxidase mimic, the supramolecular hybrid nanostructures were used to mimic natural enzymes and catalyze the glucose conversion cascade reaction. The hybrid Au NPs@Fc-Y&hemin polyhedrons showed superior catalytic activity, good reusability, and maintained the catalytic activity over a wide temperature and pH range. The study demonstrates a feasible strategy to construct hierarchical co-assembled supramolecular nanostructures as multi-enzyme mimics, with potential applications in biocatalysis and biosensing. Graphical Dual-enzymatic mimics : Based on photoinduced hierarchical co-assembly, diverse dual-enzymatic mimics, such as nanospheres, surface folded nanoparticles, and truncated polyhedrons, are constructed. The formed nanostructures exhibit superior catalytic activity towards cascade reactions, with potential applications in biocatalysis and biosensing.
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高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2026
·
IF 6.3
Haotian Yu,Zeming Yuan,Qiang Han,Jiaxin Li,Tao Li
Magnesium hydride (MgH₂) is a promising solid-state hydrogen storage material for large-scale applications, owing to its high gravimetric capacity and natural abundance. However, its practical implementation is hindered by high thermodynamic stability and sluggish kinetics, originating from strong Mg–H bonds and limited hydrogen diffusion, which typically require elevated temperatures and prolonged cycling. Moreover, existing catalytic systems frequently suffer from inadequate dispersion, interfacial instability during cycling, and a lack of quantitative understanding of the cooperative effects between oxygen vacancies and multivalent Ce. To address these issues, a Co/CeO₂@C composite catalyst was synthesized through a hydrothermal–calcination method and incorporated into MgH₂ via ball milling. The microstructural characteristics, hydrogen storage properties, and underlying reaction mechanisms were systematically investigated using X-ray Diffraction (XRD), Scanning Electron Microscope (SEM), Transmission Electron Microscope (TEM), Pressure-Composition-Temperature (PCT) tests and Johnson–Mehl–Avrami–Kolmogorov (JMAK) kinetic fitting. Evaluation based on microstructure, hydrogen uptake/release capacities at varying doping levels, and corresponding activation energies revealed that the composite with 6 wt.% Co/CeO₂@C exhibited a hydrogen uptake of 5.74 wt.%. At 300 °C, the 6 wt.% composite released 5.15 wt.% H₂ within 100 min, demonstrating its superior dehydrogenation performance at this doping level. The activation energy decreased from 145.43 kJ·mol⁻¹ to 93.35 kJ·mol⁻¹, and the thickness loss due to interfacial degradation was less than 1 nm. This enhancement is ascribed to a triple synergistic mechanism of “hydrogen spillover–electron transfer–confinement stabilization”. Co offers active sites for hydrogen dissociation, oxygen vacancies in CeO₂ promote hydrogen diffusion, and the carbon matrix suppresses particle agglomeration. This study contributes to quantitatively understanding the synergy between oxygen vacancies and multivalent Ce, establishes a clear “microstructure–catalytic mechanism–macro-performance” correlation, and offers new insights for the practical deployment of Mg-based hydrogen storage materials. It is noted, however, that the key findings presented herein align closely with trends reported in prior literature, highlighting the consistent performance landscape observed for this class of catalytic modifiers.
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产品关联
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高影响因子
Science China-Materials
·
2026
·
IF 7.4
Li Qing,Tang Jiayuan,Yang Yuhan,Chai Jun,Zhang Xiao,Shao Mingfei,Shen Hangjia
Pore-tuning engineering has been proven as an effective strategy in catalyst design for energy storage and conversion. Herein, we propose a rhombic dodecahedral iron and nitrogen co-doped carbon-based material (Fe-N-C) with hierarchical micro-mesoporous structures using mesoporous silica as the pore template and iron launch vehicle. The as-prepared catalysts (m-Fe/NC) exhibit much boosted ORR activity with half-wave potential of 0.81 V and 0.88 V in acidic and alkaline media, respectively. Furthermore, a superior specific capacity of 815 mAh g Zn −1 and stable cell voltage of 1.31 V is achieved at current density of 10 mA cm −2 when using m-Fe/NC as cathode for zinc-air batteries (ZAB). Advanced characterization techniques and theoretical calculations reveal that the introduction of mesopore structure not only improves the active site exposure, but also the proper curvature-induced strain effect from mesoporous concave surface enhances the intrinsic activity. This work provides significant insights for future development of innovative nanoporous electrocatalysts.
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