JOURNAL OF ALLOYS AND COMPOUNDS
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2015
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IF 2.999
DeCai Huang,YouFu Zhou,WenTao Xu,Kun Wang,Zhuguang Liu,MaoChun Hong
Non-rare-earth-metal Mn 2+ and Eu 2+ co-doped BaSi 3 O 4 N 2 phosphors were synthesized by solid state reaction method. The effect of Mn 2+ concentration upon photoluminescence behavior was investigated systematically. The specimens were efficiently excited from UV to visible region. The green emission of Eu 2+ was greatly enhanced by Mn 2+ due to the co-excitation and energy transfer between Mn 2+ and Eu 2+ . The energy transfer probability from Mn 2+ to Eu 2+ depends strongly on the concentration of Mn 2+ with the maximum at 6 mol%. Furthermore, corresponding quantum efficiency and thermal stability were dramatically improved. Through the assembly of as-prepared green phosphor, YAG:Ce 3+ and Sr 2 Si 5 N 8 :Eu 2+ phosphors with 460 nm InGaN chip, a broad range of white light was obtained bearing with color temperature of 3585–3650 K and color-rendering index of 95–98, exhibiting an attractive candidate for the application in phosphor converted light-emitting diodes (pc-LEDs).
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JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
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2017
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IF 3.454
Zhengfa Dai,Qiang Liu,Guido Toci,Matteo Vannini,Angela Pirri,Vladimir Babin,Martin Nikl,Wei Wang,Haohong Chen,Jiang Li
Ytterbium doped scandium oxide (Yb:Sc 2 O 3 ) transparent ceramics were fabricated by a co-precipitation and vacuum sintering method. The characteristics of the precursor and the calcined powders were investigated by BET, XRD , and SEM. Ultra-fine and low agglomerated 5at%Yb:Sc 2 O 3 powders with the average particle size about 65.4 nm were obtained after calcined at 1100 °C for 5 h. Using the synthesized powders as starting materials, 5at%Yb:Sc 2 O 3 transparent ceramics with the in-line transmittance of 71.1% at 1100 nm and average grain size of 145 μm were fabricated by vacuum sintering at 1825 °C for 10 h. Quasi-CW laser oscillation of Yb:Sc 2 O 3 ceramics was obtained at 1040.6 nm. A maximum output power as high as 2.44 W with a corresponding slope of 35% was achieved. Finally, the tunability of the ceramic was explored measuring a tuning range up to 55 nm.
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ACS Applied Nano Materials
·
2024
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IF 5.3
Xin Liu,Jiabing Luo,Xinyu Liu,Shutao Wang,Wenle Li,Jun Zhang,Yan Zhou
Designing highly efficient non-noble metal electrocatalysts to replace state-of-the-art noble metal electrocatalysts such as Pt is crucial for large-scale application of hydrogen fuel cells. In this paper, we proposed a facile synthetic strategy using metal–organic framework material as a template to achieve evenly distributed Co nanoparticles (Co NPs) on the N-doped carbon nanosheets with high specific surface area and electrocatalytic activity toward the oxygen reduction reaction (ORR). The presence of pyrrolic N modulated the electronic structure of Co to promote the ORR catalytic activity while hindering the Co NPs from aggregation. The results show that the carbon nanosheet-supported Co NPs have the best ORR electrocatalytic activity at an optimal annealing temperature (900 °C). The electrocatalyst exhibited an onset potential (Eonset) of 0.96 V vs. RHE and a half-wave potential (E1/2) of 0.89 V vs. RHE, which outperformed the commercial 20% Pt/C. At the same time, it also showed better oxygen evolution reduction and zinc–air battery (ZAB) performance than commercial RuO2 and 20% Pt/C. Therefore, this work can provide guidance for the design and synthesis of multifunctional non-noble metal electrocatalysts for future ZAB applications.
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APPLIED CATALYSIS B-ENVIRONMENTAL
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2017
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IF 9.446
Qizhao Wang,Jijuan He,Yanbiao Shi,Shuling Zhang,Tengjiao Niu,Houde She,Yingpu Bi,Ziqiang Lei
The leaf-like structure BiVO 4 electrode and MFe 2 O 4 /BiVO 4 (M = Ni, Co) composite photoelectrodes were prepared by electrochemical deposition, ensuing heating treatment and electrophoretic deposition technology. The characterizations of SEM, XRD and DRS indicated that the BiVO 4 derivatives mainly existed in small nanoparticles with monoclinic phase and exhibited stronger light absorption capability than that of pure BiVO 4 . Hereon, the respective photoelectrochemical (PEC) activities of BiVO 4 and its derived composites were systematically studied. The results suggested that the NiFe 2 O 4 /BiVO 4 and CoFe 2 O 4 /BiVO 4 not only showed higher photocurrent response values at 1.23 V vs. NHE than pure BiVO 4 electrode under visible light illumination, but also played a superior PEC hydrogen evolution performance, which was considered owing to their strong absorption to light, reduction combination of carriers and effective separation of electrons and holes.
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CHEMICAL ENGINEERING JOURNAL
·
2024
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IF 13.3
Chuhan Tang,Wei Shan,YiRan Zheng,Liang Zhang,Yuxin Liu,Bin Liao,HeDong Chen,Xianhua Hou
The widespread application of Lithium-ion Batteries (LIBs) has led to a significant increase in the number of spent LIBs. Consequently, the recycling and utilization of spent LIBs have become an inevitable choice for recovering valuable resources and protecting the environment, aligning with the principles of sustainable development. This study reports an iron air battery recycling system that is capable of recovering both Li/Co and energy from spent LiCoO 2 cathode materials and the separation reaction is completely spontaneous. Meanwhile, lithium and cobalt were successfully recovered from the powdered leach solution of spent LiCoO 2 cathode material, and it was preliminarily demonstrated that spent iron could be used as a sacrificial anode for the system. Several key parameters affecting recovery are optimized, including anode solution pH, discharge current density, and concentration of the solution to be recovered. Under the conditions of anode solution pH of 1.8, discharge current density of 0.1 mA cm −2 , and concentration of recovery solution of 0.15 mol/L, the system can be operated stably for more than 24 h, and the recoveries of Li + and Co 2+ can be up to 1.49 mg h −1 and 18.75 mg h −1 respectively, and the output energy can reach 75.15 kJ/mol. This research not only provides a sustainable and cost-effective method of disposing of used lithium-ion batteries, but also offers up new possibilities for the disposal of scrap iron.
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ENVIRONMENTAL SCIENCE & TECHNOLOGY
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2024
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IF 10.8
Aiyong Wang,Jiajia Ding,Mingqi Li,Peiyao Song,Zhiyuan Zhao,Yanglong Guo,Yun Guo,Li Wang,Qiguang Dai,Wangcheng Zhan
Short carbon chain alkanes, as typical volatile organic compounds (VOCs), have molecular structural stability and low molecular polarity, leading to an enormous challenge in the catalytic oxidation of propane. Although Ru-based catalysts exhibit a surprisingly high activity for the catalytic oxidation of propane to CO2 and H2O, active RuOx species are partially oxidized and sintered during the oxidation reaction, leading to a decrease in catalytic activity and significantly inhibiting their application in industrial processes. Herein, the Ru/Ce@Co catalyst is synthesized with a specific structure, in which cerium dioxide is dispersed in a thin layer on the surface of Co3O4, and Ru nanoparticles fall preferentially on cerium oxide with high dispersity. Compared with the Ru/CeO2 and Ru/Co3O4 catalysts, the Ru/Ce@Co catalyst demonstrates excellent catalytic activity and stability for the oxidation of propane, even under severe operating conditions, such as recycling reaction, high space velocity, a certain degree of moisture, and high temperature. Benefiting from this particular structure, the Ru/Ce@Co (5:95) catalyst with more Ce3+ species leads to the Ru species being anchored more firmly on the CeO2 surface with a low-valent state and has a strong potential for adsorption and activation of propane and oxygen, which is beneficial for RuOx species with high activity and stability. This work provides a novel strategy for designing high-efficiency Ru-based catalysts for the catalytic combustion of short carbon alkanes.
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PubMed
高影响因子
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
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2024
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IF 6.1
Qiang Liu,Jiarui Yang,Guoqing Tian,Zhenhui Huang,Liying Shen,Chuyan Hu,Baihan Wang,Kaiyang Wang,Shuang Feng,Feng Ye
Materials with high specific strength and toughness are urgently needed in the fields of electronic packaging, armor, and aerospace. SiC/Al composites show good potential for these applications but the problem of mutual exclusion of strength and toughness still needs to be solved. Herein, we propose a new strategy to simultaneously enhance its strength and toughness from the perspective of structural optimization and interface enhancement. Inspired by the nacre structure, a 3D-(SiC–Si 3 N 4 )/Al co-continuous composite was prepared by freeze-casting combined with the pressure infiltration method. During the process, elongated Si 3 N 4 grains were introduced into the ceramic framework to design the internal lamella wall structure and increase the contact area with the aluminum substrate. Moreover, a favorable interfacial bonding was designed between Si 3 N 4 and Al to improve interface wettability . The reliable microstructure of porous 3D-(SiC–Si 3 N 4 ) preform was tailored through the adjustment of initial solid loading and the α-Si 3 N 4 component. The effects of initial solid loading and the α-Si 3 N 4 component on the microstructure, interfacial wettability, and mechanical properties of the final composites were investigated. The results showed that the SiC–Si 3 N 4 /Al composites possess high flexural strength (769 MPa) and fracture toughness (15.1 MPa m 1/2 ), which is superior to data reported in general literature. Numerous elongated β-Si 3 N 4 grains are produced on the ceramic skeleton, forming an interlocking structure with the aluminum matrix, which increases the contact area with the aluminum substrate. A chemical reaction layer was formed at the interface of the composite, greatly improving the interfacial bonding strength. This work provides a promising design guideline for developing and optimizing high-strength and tough composite.
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CATALYSIS TODAY
·
2024
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IF 5.2
Xiaokun Yi,Liangkai Wu,Yang Zhao,Running Kang,Baojuan Dou,Feng Bin
Catalytic oxidation technology is a promising strategy to eliminate carbon monoxide (CO), volatile organic compounds (VOC) and other emissions from industrial boilers and to address ammonia (NH 3 ) escape. Herein, we demonstrate the potential of copper-cerium-zirconium mixed oxides or those supported on TiO 2 or ZSM-5 substrates for the simultaneous catalytic removal of CO, toluene and NH 3 . Among them, CuCeZr/ZSM-5 exhibits the best co-processing ability for mixed gases. In situ infrared spectroscopy analyses suggest that there is a competitive adsorption among CO, toluene and NH 3 , and the inhibition is in descending order of toluene＞CO＞NH 3 . Based on the physical-chemical characterizations, the Cu-Ce interfacial structure plays an important role in CO ignition at low temperatures. More importantly, the abundant acidic sites on the ZSM-5 support can improve the stability of adsorbed NH 3 at high temperatures, resulting in the best NH 3 catalytic oxidation performance of CuCeZr/ZSM-5 with no secondary pollutants of NO x . This study provides a strategy for the catalyst design to eliminate multiple pollutants targeting the properties of pollutants.
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Polymer-Plastics Technology and Materials
·
2024
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IF 2.6
Jingwen Lan,Rukuan Liu,Sisi Liu,Airong Xu
Eco-friendly silk fibroin/poly(D,L-lactide-co-glycolide) (SF/PLGA) materials were successfully fabricated using a facile strategy. The materials were characterized by scanning electron micrograph (SEM), X-ray diffraction (XRD) and infrared spectra (IR). Systematic investigations were completed to examine the degradation rates in natural soil, cytocompatibility and thermostability of the materials. It is interesting to find that after SF was hybridized by PLGA, the thermostability and degradation rate increased. Meanwhile, the materials show good cytocompatibility. SEM, IR and XRD results reveal that there is hardly any interaction between SF and PLGA in the SF/PLGA material, and SF is physically mixed with PLGA. This study opens up a new horizon in the design and preparation of SF-based materials for promising applications in medical and biodegradable material fields.
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Advanced Energy Materials
·
2025
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IF 26
Zongge Li,Wenjun Kang,Jingkai Lin,Rui Li,Konggang Qu,Suyuan Zeng,Lei Wang,Fanpeng Meng,Huayang Zhang,Haibo Li
The oxygen electrocatalytic activity of transition metal catalysts can be tuned by tailoring their microstructure to optimize electronic configuration. Here, a one-step Coordination-Selective Synthesis strategy is developed to integrate Co single-atom sites and Fe-based nanoparticles within the same matrix, enabling long-range electronic interactions that enhance Co-N 4 reactivity and improve oxygen reduction reaction performance. X-ray absorption spectroscopy confirmed that remote Fe-based nanoparticles modulate the electron distribution at Co-N 4 sites. Structural characterizations reveal that the optimal catalyst, Co 50% Fe 50% -NC, contains metallic Fe, Fe 3 O 4 , and Fe 4 N species. Electrochemical measurements show that it achieves onset and half-wave potentials of 0.984 and 0.927 V versus RHE, surpassing Co 100% -NC with only Co-N 4 sites. Additionally, it demonstrates efficient oxygen evolution reaction performance, achieving an overpotential of 298 mV at 20 mA cm −2 , comparable to RuO 2 . Density functional theory calculations reveal that Fe 4 N optimizes O-containing intermediate adsorption/desorption, lowering the theoretical overpotential. Zn-air batteries assembled with Co 50% Fe 50% -NC exhibited superior performance to Pt/C, highlighting its potential for bifunctional oxygen electrocatalysis. This study provides an approach for designing high-performance catalysts by utilizing synergistic interactions between atomic and nanoscale metal species.
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ChemistrySelect
·
2024
·Vol. 9
·期 10
·e202303652
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IF 1.9
Huanhuan Ma,Na Zhang,Xinzhu Wang,Kui Lin,Ping Liu,Fei Tian
Graphical A green one-step hydrothermal method has been successfully used to prepare carbon dots (CDs) by selectively co-doping nitrogen, phosphorus and sulphur elements. For the sensitive detection of iron ions, a fluorescence quencher sensor based on nitrogen- and sulphur-doped carbon dots (red NS-CDs) has been developed, because of the good optical properties and bio-histocompatibility of green NPS-CDs and blue NP-CDs, They are observed to penetrate NCl−H292 cells, fluorescing green and localizing in the cytoplasm. Carbon dots (CDs) with tunable photoluminescence was successfully prepared via selective co-doping of three elements, including nitrogen, phosphorus and sulfur element by green one-step hydrothermal method. Nitrogen-sulfur-doped CDs (red NS-CDs), which emitted red fluorescence under UV excitation, were used to detect iron ions in the linear range 1–50 μM, yielding detectable limits as low as 94 nM. The nitrogen-phosphorus-doped CDs (blue NP-CDs) exhibited blue fluorescence with quantum yields up to 34.5 %. When the concentration is 800 μg/mL, it showed excellent anticancer effect in vitro. The nitrogen-sulfur-phosphorus-doped CDs (green NPS-CDs) emitting green fluorescence showed a low cytotoxicity at a high concentration of 800 μg/mL and were used for intracelluar imaging of NCl−H292 cells. This study demonstrated the photoluminescent characteristics of carbon dots (CDs) and highlighted the ability to modify their peak fluorescence emission wavelengths through the flexible combination of specific reagents under comparable hydrothermal conditions. Additionally, it provided valuable insights into the efficient methodologies for synthesizing CDs suitable for various application scenarios.
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INORGANIC CHEMISTRY
·
2025
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IF 4.7
Gongjing Song,Yuxin Shi,Biao Yang,Yifei Yang,Huan Pang
Since the radius of sodium ions is larger compared to that of lithium ions, it is more likely to lead to the structural instability of the electrode material during the embedding and de-embedding process or even trigger the structural collapse. Due to the ability of unsaturated coordination metal–organic framework materials to expose more metal active centers and provide additional sodium-ion binding sites, these materials have great potential as anode materials for sodium-ion batteries. In this study, we obtained unsaturated coordinated Co-terephthalic acid materials via a simple hydrothermal method using an adjusted metal-to-ligand ratio. The rigid structure of the benzene ring and the presence of the –COO– group ensures both the high-strength stability of the material and the increase in the intercalation sites for Na ions. Therefore, the electrode based on this MOF demonstrates a long lifespan and a high capacity of 191 mA h g–1 at 100 mA g–1. The preparation of pure MOF materials by constructing unsaturated sites provides ideas for the application of MOF-based materials in sodium-ion batteries.
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