JOURNAL OF THE AMERICAN CERAMIC SOCIETY
·
2020
·Vol. 103
·期 10
·5664-5677
·
IF 3.502
Yao Ji,Yongbao Xiao,Shujing Huang,Weichao Wang
Fluoro-sulfo-phosphate (FPS) glass is of current interest as potential material for laser application due to its good glass-forming ability, thermal, and chemical stability as well as the complicated local environment for incorporated species. Herein, the physical and luminescent properties of Er 3+ and Yb 3+ /Er 3+ -doped FPS glasses vs S/F ratio are investigated comprehensively. The low melting temperature (750°C) leads to fewer ingredients evaporation and easier operation. The sulfate addition depolymerizes the structure of FPS glasses, leading to either monotonic or nonmonotonic variations of physical properties, while no deterioration in thermal and limited one in chemical stability is caused. The addition of sulfate also modifies the local structure around optical active species and thus, leading to higher emission cross section (1.52 × 10 −20 cm 2 ), effective linewidth (68.4 nm), figure of merit (5.61 × 10 −23 s cm 2 ), gain bandwidth (102.44 × 10 −27 cm 3 ), and energy-transfer microparameters (51.87 × 10 −39 cm 6 /s), implying high possibility to serve as 1.5 μm laser application.
研究领域:
材料科学
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光学
·
激光物理
✓ 已验证
DOI
高影响因子
ACS Applied Materials & Interfaces
·
2023
·
IF 9.5
Junhao Li,Dacheng Zhou,Ying Liu,Yan Chen,Jiayuan Chen,Yong Yang,Yuan Gao,Jianbei Qiu
All inorganic perovskite (CsPbX3, X = Cl, Br, I) quantum dot (QD) glass samples are considered the next generation of lighting materials for their excellent luminescence properties and stability, but crystallization conditions are difficult to control, which often leads to the inhomogeneous crystallinity of QDs. Here, we provided evidence that the presence of sodium fluoride induced self-crystallization of CsPbBr3 QDs during routine glass formation without the need for additional heat treatment. We showed that NaF simultaneously affected the network structure of glass and promoted the formation of CsPbBr3 QDs, that is, Na+ ions entered the glass network skeleton, partially interrupting the network structure, while the strong electronegativity of F– ions attracted Cs+ and Pb2+ ions into the gaps formed in the glass networks that had been loosened up by Na+ ions, which reduced the activation energy of crystallization processes. Our results showed that NaF-induced CsPbBr3 QDs glass had excellent thermal stability, high photoluminescence quantum efficiency (49%), and luminescent stability under high-power laser irradiation. Finally, this work also demonstrated the general applicability of this method in the making of a series of CsPbX3 (X = Cl, Br, I) QD glass samples by NaF-induced self-crystallization, which drastically expanded the color gamut to a range of full spectrum for luminescence and laser-driven projection displays. We believe that the work presented here represents a new direction for the research and development of full-color gamut inorganic perovskite quantum dot glass samples, which could have a significant impact on the future applications of laser-driven projection displays as well.
研究领域:
材料科学
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光学工程
·
纳米技术
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Journal of Materials Chemistry A
·
2020
·Vol. 9
·期 1
·413-422
·
IF 11.301
Xiaohuan Chang,Junjie Fu,Dongxing Kou,Wenhui Zhou,Zhengji Zhou,Shengjie Yuan,Yafang Qi,Zhi Zheng,Sixin Wu
The introduction of alkali metal (AM) post-deposition treatment (PDT) has led to the consecutive breakthrough of world record efficiencies for Cu(In,Ga)Se2 photovoltaics. However, for the derivative Cu2SnZn(S,Se)4 (CZTSSe) solar cells, the corresponding verdict seems partially unjustified due to the difference in defect chemical environment and phase structure, and the most effective incorporation means of AMs is still a mystery. In this work, for the first time, we developed a dual AM synergistic incorporation strategy combining light and heavy AMs by post-depositing CsF after NaF-PDT to improve the efficiency of CZTSSe solar cells. The relevant microscopic-electrical advantages with regard to the different roles of NaF and CsF PDT are discussed in more detail. It was found that the Na atoms are randomly dispersed both in the grain interior (GI) and grain boundaries (GBs), significantly increasing the acceptor concentration and passivating the deep level defects to enhance the Voc. In contrast, the Cs atoms are mainly segregated at the GBs, primarily increasing the potential of the GBs and improving the FF. The prominent electric benefits of Cs at the GBs and Na in the GI finally increase the device efficiency from 10.12% to 12.16%. Our findings solve the difficulty in obtaining the available Voc and FF for future high efficiency research and should serve as a basis for the in-depth understanding of AM-PDT in kesterite photovoltaics.
研究领域:
材料科学
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光伏技术
·
半导体物理
✓ 已验证
产品关联
DOI
高影响因子
International Journal of Coal Preparation and Utilization
·
2025
·
IF 2.1
Shengchao Yang,Sheng Dong,Jinpeng Qiao,Chao Kang,Yuqian Zhao,Yanze Wang,Jianrong Liu,Chenlong Duan,Sabereh Nazari,Miao Pan
Aiming at the problems of high quartz content, high ash content and difficult leaching of aluminum and gallium in some coal gangue, NaF-strengthened coal gangue calcination-hydrochloric acid leaching process was adopted, and the occurrence state of gallium in coal gangue was explored. The residue was analyzed by XRD and SEM, and the mechanism of NaF-strengthened coal gangue acid leaching was explored. The results show that the addition of m (NaF): m (coal gangue) = 0.06 can increase the leaching rate of aluminum in coal gangue from 33.72% to 62.03%, and the leaching rate of gallium from 43.17% to 70.15%. NaF as an additive can react with hydrochloric acid to form HF to destroy the coal gangue structure, so that hydrochloric acid can react with metakaolinite inside the quartz accumulation layer, which improves the leaching rate of aluminum and gallium. Finally, the process factors were studied separately to reveal the pattern in response to them, and it was found that the acid leaching reaction was greatly affected by internal diffusion, which provided a reference for the subsequent complexation adsorption of gallium.
研究领域:
冶金工程
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
ELECTROCHIMICA ACTA
·
2024
·
IF 5.5
Biwu Cai,Jianbang Ge,Zichen Zhang,Yang Gao,Shun Cao,Zhihao Cheng,Xin Lu,Shuqiang Jiao
Understanding mass transfer is of great importance to molten salt electrochemistry. However, natural convection has long been neglected in electrochemical measurements in stagnant molten salt systems due to the complex mathematical treatments. Here we reported the notable natural convection effects in molten LiF-NaF-KF during cyclic voltammetry and chronoamperometry tests. The established model showed that the convection-diffusion layer (CDL) convection dominated mass transfer under long time-scale tests in molten LiF-NaF-KF-EuF 3 . However, in the case of molten LiF-NaF-KF-K 2 TiF 6 , CDL convection predominated at dilute redox concentrations while density-driven convection came into dominance at high redox concentrations, because of the severe coordinate structure change of the redox couple. The derived thickness of the convection-diffusion layer, δ c o n v . , ranged from 135 to 183 μm, much higher than that in aqueous solutions (220–250 μm). Moreover, the increase in system temperature greatly enhanced natural convection effects in molten fluorides. Lastly, the use of microelectrode (re<39.7 μm for δ c o n v . =160 μm) was demonstrated to be an effective way to suppress the intense natural convection effects.
研究领域:
电化学
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF RADIOANALYTICAL AND NUCLEAR CHEMISTRY
·
2021
·Vol. 328
·期 3
·991-1000
·
IF 1.371
Cai Jialing,Feng Jiahui,Li Jiahui,Feng Yu,Liu Fuping,He Feifang,Yu Haoqi,Zhang Zimin,Hu Yanqin,Hua Rong
This paper characterized the microstructure and physical properties of the scale from a uranium mine in Xinjiang by SEM, XRD and FT-IR. Based on the orthogonal experiment design, the formula of HClO 4 : EDTA: (NaF + HNO 3 ) = 4:1:5 is selected. The results show that the scale remover has the functions of dissolution, lattice damage and dispersion. The selected collaborative scale removal method can effectively remove the scale in the uranium mining process and has certain application value.
研究领域:
化学工程
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环境科学
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材料科学
✓ 已验证
产品关联
DOI
高影响因子
INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
·
2023
·
IF 4.2
Chuang Liu,Jun Liang,Duozheng Ma,Xiangcheng Li,Liyuan Li,Yu Wang,Tiezhu Zhang,Wenhua Fu,Zhendong Wang,Weimin Yang
The synthesis of zeolite nanosheets is an effective strategy to obtain advanced catalysts with enhanced catalytic performance due to the improved diffusion properties. ZSM-22 zeolite nanosheets (F-ZSM-22, U-ZSM-22) with a controllable orientation and a thickness of less than 20 nm were obtained through hydrothermal crystallization by introducing NaF or urea into the synthetic system of conventional ZSM-22 (C-ZSM-22). In the presence of both NaF and urea, a zeolite nanosheet (FU-ZSM-22) with a decreased width was synthesized. In comparison with C-ZSM-22, all ZSM-22 nanosheets displayed better diffusion properties. On testing catalysts in the methanol-to-hydrocarbon reaction, ZSM-22 nanosheets showed better stability than C-ZSM-22, and FU-ZSM-22 was the best catalyst.
研究领域:
催化化学
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材料科学
✓ 已验证
产品关联
DOI
高影响因子
METALLURGICAL AND MATERIALS TRANSACTIONS B-PROCESS METALLURGY AND MATERIALS PROCESSING SCIENCE
·
2011
·Vol. 42
·期 5
·1065-1070
·
IF 0.974
Yan Hengwei,Yang Jianhong,Li Wangxing,Chen Shazi
KF-NaF-AlF 3 -based electrolyte is a promising low-temperature electrolyte for aluminum reduction. Alumina solubility in molten KF-NaF-AlF 3 -based electrolyte was determined as a function of the melt composition and temperature by measuring the weight loss of a rotating corundum disk and by using a LECO RO500 oxygen analyzer (LECO Corporation, St. Joseph, MI). The investigated temperature range is 1023 K to 1073 K (750 °C to 800 °C), and the total cryolite molar ratio (CRt = ([KF] + [NaF])/[AlF 3 ]) is 1.3 to 1.5; the content of NaF ranges from 0 mol pct to 50 mol pct. The effect of temperature, CaF 2 , and LiF on alumina solubility is discussed as well.
研究领域:
冶金学
·
材料科学
·
电化学
✓ 已验证
DOI
高影响因子
ACS Applied Nano Materials
·
2022
·
IF 6.14
Long Chen,Yang Wu,Heyong Huo,Bin Tang,Xiaotong Ma,Jingjing Wang,Chenghua Sun,Jibin Sun,Shuyun Zhou
Cold neutron has a strong ability to penetrate metal materials and identify light elements, making it an ideal nondestructive testing technique for detecting cracks, bubbles, or other defects in metals. However, the low imaging resolution and detection efficiency of scintillators limit the application of cold neutron technology in imaging. The particle size and luminescence properties of scintillator materials have an important influence on the spatial resolution and detection efficiency of cold neutron radiography. Here, we report a series of NaF-doped Gd2O2S:Tb3+ (NaF-d-GOS:Tb) scintillators with adjustable particle size, which were prepared through a two-step method of solution precipitation followed by solid-phase vulcanization calcination. It was found that the NaF-d-GOS:Tb scintillators showed the highest quantum yield, reaching up to 62.94%. They were applied to fabricating cold neutron ultrathin screens. The resolution can reach 12 μm in the cold neutron imaging system. These NaF-d-GOS:Tb scintillators with excellent fluorescence facilitate the development of nondestructive testing techniques based on cold neutron imaging.
研究领域:
材料科学
·
核物理
·
成像技术
✓ 已验证
产品关联
DOI
高影响因子
ACS Applied Materials & Interfaces
·
2023
·
IF 9.5
Tinghu Liu,Lin Shen,Yunming Li,Kemin Jiang,Libo Song,Yuming Jin,Jing Yang,Xing Xin,Xiayin Yao
NASICON oxide solid electrolytes are considered promising candidates for all-solid-state sodium batteries due to their extremely high ionic conductivity and favorable electrochemical stability. However, the practical application of NASICON electrolytes is greatly impeded by poor electrolyte–electrode interfacial contact and continuous sodium dendrite propagation. Herein, a NaF-rich multifunctional interface layer on the surface of a Na anode (Na@NaF-rich), containing NaF, amorphous carbon, and an unreacted C–F bond species, is developed in situ by the reaction between Na and commercial poly(tetrafluoroethylene). This NaF-rich interface layer is proven to reduce the diffusion barriers at the Na/NASICON electrolyte interface and homogenize Na deposition as well as suppress Na dendrite growth, thus achieving a high critical current density of 4 mA cm–2. The resultant Na3V2(PO4)3@C/Na@NaF-rich all-solid-state cell showed a high initial specific capacity of 117.6 mAh g–1 at 0.1 C with a Coulombic efficiency of 94.8%. Even at 0.5 and 1 C, it still exhibited high capacity retentions of 83.3% and 80.4%, respectively, after 750 cycles.
研究领域:
材料科学
·
电化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
MATERIALS RESEARCH BULLETIN
·
2024
·
IF 5.3
Junyi Tan,Bo Jing,Qiuju Li,Cong Liang,Xiao Guo
It is of great significance to clarify the electrochemical behavior of Ta 5+ in LiF-NaF-K 2 TaF 7 molten salt systems for the preparation of tantalum metal by molten salt electrodeposition. The aim of this work was to explore the reaction steps and behavior of the reduction of metal Ta from Ta 5+ in fluorine molten salt by electrochemical method. The cyclic voltammetry , square wave voltammetry , chronopotentiometry were used to determine the reduction steps of Ta 5+ . The results showed that there were two reduction steps which the first reduction step R 1 was TaF 7 2 − + 2 e − ⇌ Ta F 3 + 4 F − and the second reduction step R 2 was Ta F 3 + 3 e − → Ta + 3 F − . SEM, XRD and EDS results showed that the reduction product of Ta 5+ in molten salt is Ta and the tantalum atom was selectively deposited and grew on the (200) crystal plane in priority.
研究领域:
电化学
·
材料科学
·
冶金学
·
无机化学
✓ 已验证
DOI
高影响因子
JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2026
·
IF 9.6
Zhen Li,Jinglin Mu,Xiaozhong Wu,Jiwen Li,Hao Yin,Tong Zhou,Xiangyan Shen,Pengfei Zhou,Jin Zhou
Making CF x -based batteries rechargeable represents a superior promise route to dramatically boost of secondary battery systems due to the unprecedented theoretical capacity and specific energy density of CF x . However, this goal has been plagued by a fundamental challenge of the high dissociation energy and the non-uniform deposition of the discharge products, alkaline metal fluoride (e.g., NaF). Herein, a novel strategy of engineering the discharge product NaF is developed. The hybrid Cu@CF 0.88 cathode material delivers a reversible discharge capacity of 700.6 mAh g −1 at 20 mAh g −1 and an energy density of 1541.1 Wh kg −1 , corresponding to 81.4% of the theoretical value. At 200 mAh g −1 , it gives a reversible discharge capacity of 250.1 mAh g −1 after 10 cycles. The Cu nanoparticles serve as preferential nucleation sites, effectively regulating the nucleation, crystallization, and spatial distribution of NaF in the initial discharge process. More importantly, an in situ generated intermediate NaCuF 3 induces the reconstruction of NaF into a more readily decomposable and electrochemically active amorphous phase. This strategy remarkably improves the reaction reversibility of the Na/CFₓ batteries, while additional efforts are required to optimize the long-term cycling stability for practical applications.
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DOI
PubMed
高影响因子
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