OPTICAL MATERIALS
·
2022
·
IF 3.754
Liming Wei,Jinyu Ye,Xiongtu Zhou,Tailiang Guo,Chunfeng Ren,Qun Yan,Yongai Zhang,Chaoxing Wu
Indium phosphide (InP) Quantum dots (QDs) are becoming one of the most favorable alternatives of cadmium-based QDs in view of their heavy metal-free and tunable luminescence. However, the photoluminescence performances of InP QDs still remain to be improved especially for the aminophosphine based synthesis method. In this work, we present a one-pot synthesis route of InP/ZnS red QDs based on tris(dimethylamino)phosphine (DMP) phosphorus precursor by using ZnF 2 to generate HF and F ions in situ for the elimination of surface oxidative layer of InP cores and the passivation of indium dangling bonds. The synthesis conditions in terms of ZnF 2 concentration, reaction temperature and growth time, were further investigated in order to obtain an optimization of fluorescence properties of InP QDs. It is found that the PL QY of both InP and InP/ZnS QDs are significantly improved by the ZnF 2 additive. The PL QY of ∼16.4%, FWHM of 50 nm for pristine InP QDs and PL QY of ∼73%, emission peak of 628 nm, FWHM of 55 nm for ZnS shelled InP QDs can be obtained when the ratio of ZnF 2 to ZnCl 2 , reaction temperature and growth time are 1:1, 200 °C and 40 min, respectively. Compared with the InP/ZnS QDs synthesized without ZnF2 treatment (55% PL QY, 611 nm emission peak, 62 nm FWHM), the PL QY is increased by 32.7%.
研究领域:
材料科学
·
纳米技术
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产品关联
DOI
高影响因子
Journal of Cleaner Production
·
2024
·
IF 9.7
Baohong Zheng,Lin Ban,Yingxia Nie,Long Chen,Song Yang,Heng Zhang
Against the backdrop of energy crisis and quest for carbon neutrality , efficient utilization of heterogeneous catalysts to facilitate one-pot conversion of low-quality nonedible oils into biodiesel, shows enormous promise for the reduction of carbon footprints and environmental pollution. In this study, an effective heterogeneous catalyst, acid-base bifunctional mesoporous ZnF 2 (MP-ZnF 2 ) was successfully fabricated for biodiesel synthesis from Koelreuteria integrifoliola oil (KIO, acid values of 8.26 mg KOH/g) via facile one-pot process. Meanwhile, systematic characterization showed the large specific surface area (62.9 m 2 /g), abundant mesoporous (12.15 nm), outstanding thermal stability, and plentiful stable acid-base sites (1.22 and 0.56 mmol/g) of MP-ZnF 2 . Consequently, MP-ZnF 2 achieved a high biodiesel yield of 97.15% under moderate conditions (103 °C, 6.2 h, 10.2 wt% catalyst dosages, 29:1 MeOH/KIO molar ratio) optimized by response surface methodology (RSM). More importantly, through the kinetic investigation, a low activation energy of 49.24 kJ/mol explained the reason for its high activity, and the possible reaction mechanism of (trans)esterification was also proposed. In addition, MP-ZnF 2 demonstrated satisfactory reusability (6th cycle, >90%), water resistance (8 wt% water content, 89.25%), and versatility (all yields >90%). According to cost analysis, the price of biodiesel in this work was about 0.64 $/kg. Notably, the as-prepared biodiesel conformed to ASTM D6751 and EN 14,214 standards, indicating great application prospects. It was demonstrated that one-pot transformation of KIO into biodiesel using acid-base bifunctional MP-ZnF 2 contributes to the sustainable development of clean energy.
研究领域:
能源科学
·
催化化学
·
环境科学
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产品关联
DOI
高影响因子
ADVANCED FUNCTIONAL MATERIALS
·
2023
·Vol. 33
·期 32
·2301372
·
IF 19
Leipeng Li,Chongyang Cai,Xiaohuan Lv,Xingqiang Shi,Dengfeng Peng,Jianrong Qiu,Yanmin Yang
Owing to the forthcoming global energy crisis, the search for energy-saving materials has intensified. Over the past two decades, mechanically induced luminescent materials have received considerable attention as they can convert waste into useful components, for instance, the conversion from stress into light. However, this material features many constraints that limit its widespread application. Herein, a strategy to improve the mechanoluminescence (ML) of ZnO by embedding it in a ZnF 2 :Mn 2+ matrix is introduced. Upon dynamic excitation via an external stress, the reddish-yellow ML is confirmed to originate from the 4 T 1 (4G) → 6 A 1 (6S) transition of the optically active Mn 2+ center. Moreover, the sample with the strongest ML contains the appropriate amount of ZnF 2 (ZnF 2 :ZnO = 7:3). By performing density functional theory calculations, a possible ML-enhancement mechanism is elucidated, which indicates the formation of a ZnF 2 /ZnO:Mn 2+ heterojunction. Considering the unique characteristics of ML, its promising applications are demonstrated in various mechano-optics scenarios, including flexible and stretchable optoelectronics, advanced self-powered displays, e-skins/e-signatures, and anti-counterfeiting, without the use of external light/electric-incentive sources. The study significantly increases the variety of ML materials and is expected to strengthen the foundation for the future development of smart mechanically controlled devices and energy-saving systems.
研究领域:
材料科学
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光学
·
力学
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DOI
高影响因子
ACS Sustainable Chemistry & Engineering
·
2026
·Vol. 14
·期 37
·16776-16785
·
IF 7.6
Zhu Keyu,Lei Zuomin,Hu Mengliang,Qu Zongtao,Lyu Shu-shen,Mo Dong-chuan
Aqueous zinc-ion batteries hold great promise for large-scale energy storage due to the natural abundance and intrinsic safety of zinc. However, practical application is hindered by uncontrollable dendrite growth and the hydrogen evolution reaction (HER) on the zinc metal anode. Here, we fabricate a three-dimensional (3D) ZnF 2 –Sn composite zinc metal anode via a one-step method. The outer ZnF 2 layer and inner Sn layer synergistically suppress HER and regulate zinc deposition, effectively mitigating dendrite formation. The 3D architecture further accommodates volume variations during long-term cycling, alleviating structural degradation. Consequently, a symmetric cell achieves a cycling life exceeding 2000 h, and an asymmetric cell with a Cu current collector maintains a high Coulombic efficiency over 2000 cycles. More importantly, a Zn–I 2 full cell delivers a capacity retention of 94% after 5000 cycles at 1 A g –1 . This work provides a rational design strategy for high-performance, long-life zinc metal anodes in aqueous zinc-ion batteries.
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DOI
高影响因子
JOURNAL OF THE AMERICAN CERAMIC SOCIETY
·
2020
·Vol. 104
·期 2
·824-832
·
IF 3.502
Dashuang Ding,Yanlong Wang,Changgui Lin,Jing Ren,Wenbo Shi,Pengyuan Wang,Bing Yang,Shaoqian Zhang,Liping Duo
Incorporation of transition-metal ions (TMIs) in the precipitated nanocrystals (NCs) of glass-ceramics (GCs) greatly improves the photonic properties of these materials. The crystal field and coordination of TMIs show fingerprints for spectroscopic characterization. However, it is difficult to probe the effect of the host NCs’ structural phase on doped TMIs’ d-d orbitals. Herein, ZnF 2 :Ni and KZnF 3 :Ni based on controllable crystallization in KF-ZnF 2 -SiO 2 :Ni 2+ GCs were taken as model systems. Compared to ZnF 2 , perovskite-type KZnF 3 has higher binding energy Zn-F bonds in which Ni 2+ are easier to be segregated, which makes KZnF 3 :Ni be better “excited electron trapper” due to hole localization to intra-gap Ni states. These findings contribute to the understanding and design of TMIs-doped GCs in practical applications.
研究领域:
材料科学
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光子学
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固态化学
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纳米材料
·
光学材料
✓ 已验证
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2021
·
IF 13.273
Li-ying Wei,Nan-ping Deng,Jing-ge Ju,Hui-juan Zhao,Gang Wang,Heng-ying Xiang,Wei-min Kang,Bo-wen Cheng
In this work, the ZnF 2 doped three-dimensional (3D) porous carbon nanofibers (ZnF 2 -PCNFs) were prepared via the electro-blow spinning (EBS) and carbonization strategy. And its applications as promising interlayer to hybridize with metal Li as composite anode for lithium metal batteries (LMBs) were systematically investigated and researched. The 3D interconnected porous skeleton with a high electrical conductivity and large surface area could reduce the local current density and endow the significantly enhanced interfacial compatibility between the interlayer and lithium electrode including a high lithium-loading capacity. Moreover, the lithiophilic ZnF 2 nanoparticles formed in-situ during carbonization process could provide more active sites to trigger an analogous alloying reaction with Li to guide the Li plating/stripping more homogeneous. For the assembled Li||LiFePO 4 (LFP) batteries with ZnF 2 -PCNFs, the optimal initial discharge capacity and capacity retention after 500 cycles at 1C were 142.70 mAh g −1 and 96.42%, respectively. The symmetric Li||Li batteries further showed that the ZnF 2 -PCNFs coating interlayer could hinder Li dendrite growth and improve the cycling stability. In addition, the obtained Li||S battery with ZnF 2 -PCNFs also delivered the outstanding cycle performance among the various samples based on the convenient transport channels of Li ions and the strong adsorption or captured ability of ZnF 2 -PCNFs to species. These facts demonstrated that the prepared ZnF 2 -PCNFs coating acting as interlayer between separator and anode could effectively enhance safety and electrochemical performance of LMBs.
研究领域:
材料科学
·
能源科学
✓ 已验证
产品关联
DOI
高影响因子
Journal of Materials Chemistry A
·
2024
·Vol. 12
·期 29
·18127-18136
·
IF 10.7
Jing Tao,Can Zhang,Xueyang Li,Xinlong Chen,Chenzhen Ji,Wang Wan,Chao Wang
Lithium metal anodes tend to form non-uniform Li deposition that causes dendrite growth during cycling. Meanwhile, the deposition and dissolution of lithium metal often results in the continuous formation and breakdown of the SEI. Additionally, the use of thick lithium metal often results in an excessive inventory of lithium, which diminishes the energy advantage of lithium metal. Fabricating thin lithium foils is challenging owing to the low mechanical strength of lithium metal. To address these issues, we employed an in situ structural regulation strategy to prepare high-performance lithium metal batteries. The mechanical strength of the prepared LiF@LiZn10/Li foil was significantly enhanced, allowing it to be thinned down to a thickness of 5 μm, accompanied with great air stability. Moreover, the in situ formation of LiZn alloys improved Li-deposition behavior. Furthermore, we demonstrated the participation of LiF particles in the in situ formation of the SEI, which facilitated Li+-transport kinetics. The LiF@LiZn10/Li electrode demonstrated significantly enhanced cycling performance by synergistically improving Li-deposition behavior and optimizing the SEI layer in situ. The LiF@LiZn10/Li foil electrode exhibited a long cycling life of over 1300 h at 1 mA cm−2 and 1 mA h cm−2. When coupled with a commercial LiFePO4 cathode (3.3 mA h cm−2), the LiFePO4‖LiF@LiZn10/Li cell exhibited a cycle life approximately thrice that of the cells with LMBs. This work provides a novel strategy to optimize LMAs for next-generation LMBs.
研究领域:
材料科学
·
电化学
✓ 已验证
DOI
高影响因子
MATERIALS CHARACTERIZATION
·
2023
·
IF 4.7
Jiwei Yao,Hui Yong,Yang Zhao,Chengyan Sun,Xianliu Xu,Baosheng Liu,Dongliang Zhao,Jifan Hu,Yanghuan Zhang
The Mg 90 Ce 5 Y 5 + x wt% ZnF 2 ( x = 3, 6, 10, 15) composites were prepared by mechanical ball-milling. The effects of ZnF 2 contents on the hydrogen absorption and desorption properties of Mg 90 Ce 5 Y 5 alloy were investigated by XRD , ICP-OES, TEM, PCT and DSC . The excellent hydriding-dehydriding characteristics of the samples after activation were attributed to the catalytic effect of the MgF 2 and MgZn 2 phases introduced in situ by the addition of ZnF 2 . The Mg 90 Ce 5 Y 5 + 6 wt% ZnF 2 composites exhibit the fastest hydrogen adsorption/desorption kinetics and lower decomposition temperatures. At 360 °C, 4.12 wt% H 2 can be absorbed within 180 s, and completely dehydrogenated within 740 s. In addition, the activation energy of dehydrogenation is reduced to 89.5 kJ/ mol, the optimal dehydrogenation temperature is reduced to 318 °C. It is due to the generation of in situ catalysts that weaken the Mg H bond energy, refine the grain sizes , expand specific surface area and increase hydrogen diffusion paths. However, the improvement of the thermodynamics of the composites is limited, the enthalpy is 75.9 kJ/mol H 2 .
研究领域:
材料科学
·
能源储存
✓ 已验证
产品关联
DOI
高影响因子
CERAMICS INTERNATIONAL
·
2016
·Vol. 42
·期 6
·7373-7379
·
IF 2.758
Dezhi Hu,Zhihong Li,Yumei Zhu
The synergistic effect of ZnF 2 –TiO 2 –SiO 2 and seeds on the sintering behavior and microstructure of corundum abrasive was investigated. Significant improvement on microstructural homogeneity, densification and mechanical property was achieved by the co-doping and two step sintering (TS) for the abrasive samples. All the doped samples showed relative densities higher than 98% and single particle compressive strengths larger than 30 N. Besides, the two-step sintering samples attained smaller particle sizes, slightly higher densities, and narrower particle size distributions . Sample sintered by TS method with MgTiO 3 seed and the addition of ZnF 2 /TiO 2 /SiO 2 in the molar ratio of 5:7:5 obtained single particle compressive strength of 56.3 N, theoretical density of 99.4% and an average grain size of 0.46 μm. The phase transformation temperatures of doped samples were much lower than that of un-doped ones and they dropped significantly as the content of ZnF 2 raised. The relationship between microstructure and mechanical properties was also discussed.
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DOI
高影响因子
Nature Communications
·
2023
·Vol. 14
·期 1
·1-12
·
IF 16.6
Wang Wei,Chen Shan,Liao Xuelong,Huang Rong,Wang Fengmei,Chen Jialei,Wang Yaxin,Wang Fei,Wang Huan
In situ formation of a stable interphase layer on zinc surface is an effective solution to suppress dendrite growth. However, the fast transport of bivalent Zn-ions within the solid interlayer remains very challenging. Herein, we engineer the SEI components and enable superior kinetics of Zn metal batteries under harsh conditions through regulating the sequence of interfacial chemical reaction. With the differences in chemical reactivity of trimethyl phosphate co-solvent and trifluoromethanesulfonate anions in the Zn 2+ -solvation shell, Zn 3 (PO 4 ) 2 and ZnF 2 are successively generated on Zn metal surface to form a gradient ZnF 2 –Zn 3 (PO 4 ) 2 interphase. Mechanistic studies reveal the outer ZnF 2 facilitates Zn 2+ desolvation and inner Zn 3 (PO 4 ) 2 serves as channels for fast Zn 2+ transport, contributing to long-term cycling at subzero temperatures. Impressively, the gradient SEI enables a high lifespan over 7000 hours in Zn symmetric cell and a capacity retention of 86.1% after 12000 cycles in Zn–KVOH full cell at –50 °C.
研究领域:
电化学
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材料科学
·
电池技术
✓ 已验证
DOI
PubMed
高影响因子
JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2025
·
IF 9.7
Mengxiang Nie,Xiaolin Zhu,Shengjie Jiang,Qingyu Xie,Long Luo,Liang Zhao,Min Zhou,Daofu Wu,Xiaosheng Tang,Jia Wang,Shengnan Tian,Yongfeng Liu
Halide perovskite quantum dots (PeQDs) have garnered significant attention for their exceptional optoelectronic properties, particularly in light-emitting diode (LED) applications. However, their susceptibility to thermal degradation at elevated temperatures (>100 °C) poses a critical barrier to commercialization. In this study, we address this challenge through a synergistic ZnF 2 post-treatment strategy applied to CsPbBr 3 PeQDs. Comprehensive experimental characterizations and density functional theory (DFT) calculations reveal that the ZnF 2 treatment induces the formation of a dual-shell structure: CsPbBr 3 : F inner shell and a zinc-rich outer shell chemically that bonds with Br and F ions from the CsPbBr 3 : F layer. The inner shell primarily suppresses thermal degradation, while both shells collaboratively mitigate surface defects. This dual-shell engineering endows the CsPbBr 3 PeQDs with remarkable thermal stability, maintaining their optical properties and crystallinity even after heating at 120 °C for 60 min, alongside achieving near-unity photoluminescent quantum yield. Furthermore, the dual-shell PeQDs exhibit a 24-fold enhancement in device lifespan in electroluminescent LEDs and superior operational stability in photoluminescent white LEDs. This work offers a simple yet highly effective approach to fabricating thermally stable PeQDs, paving the way for their practical application in next-generation optoelectronic devices.
研究领域:
材料科学
·
纳米技术
·
光电材料
·
化学工程
·
理论化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Energy Storage Materials
·
2023
·
IF 20.4
Zhengtai Zha,Tianjiang Sun,Diantao Li,Tao Ma,Weijia Zhang,Zhanliang Tao
The issues of serious corrosion and dendrite growth in electrode surface hinder the commercialization of aqueous zinc batteries . A stable solid electrolyte interphase (SEI) on electrode surface is critical to improve electrochemical performance of Zn anode. Here, a novel zwitterion additive as an electrical double layer (EDL) regulator with SEI-forming capability is developed. The zwitterion exhibits preferential adsorption with Zn anode to construct a fast Zn 2+ migration channel. More importantly, a ZnF 2 SEI layer can be in-situ generated on the anode due to preferential electroreduction of zwitterion, which isolates Zn anode from electrolytes. Therefore, the symmetric cells with the proposed electrolyte survive long cycling stability over 600 h at 10 mA cm −2 and 10 mAh cm −2 . The merits of zwitterion additive are further demonstrated in the Zn||V 2 O 5 · n H 2 O full cell with a capacity retention of ∼80 % after 1000 cycles.
研究领域:
电化学
·
储能
·
材料科学
·
电池技术
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）