Journal of Energetic Materials
·
2022
·
IF 2.421
Dongyu Hao,Yinghui Hu,Fang Wang,Debin Xia,Dakang Wang,Ruiqing Fan,Yulin Yang,Kaifeng Lin
In this work, a novel Al2O3-free core-shell structured nAl@aluminum-perfluorooctanoate (F-x) nanocomposite has been prepared via a self-assembly approach. The Al2O3 shell was first removed by hydrofluoric acid (HF) solution, and then the perfluorooctanoic acid (PFOA) was coated on the surface of nAl by a self-assemble reaction. The thickness of the obtained F-x layer can be easily tuned by using different amount of PFOA based on the chemical interaction between nAl and PFOA molecules. The obtained nAl@F-x nanocomposite showed an enhanced exothermic and combustion performance due to the synergetic effect between F-x and nAl and the mesoporous structure in situ formed during the combustion process. This work demonstrated that nAl@F-x nanocomposite prepared by PFOA coating on nAl could effectively solve the detrimental effect of in situ formed Al2O3, thus enhancing the combustion and thermal reaction performances, which showed great potential to be applied in solid rocket propellant.
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JOURNAL OF POWER SOURCES
·
2021
·
IF 9.127
Ailing Tian,Kailin Luo,Zhendong Li,Mingming Ma,Shun Li,Xingyi Wang,Deyu Wang,Zhe Peng
Lithium (Li) metal and alloy anodes are strongly attractive for next high-energy-density batteries , owing to their high theoretical specific capacity and low redox potentials . However, the fast electrode pulverization caused by large volume variation upon cycling inhibits the use of the Li metal and alloy anodes seriously, whereas the sluggish charge transfer and weak electrode/electrolyte interphase are mainly responsible for their uneven volume expansion and surface breaks, respectively. Herein, a versatile F–N–S doped lithiophilic interphase is obtained via a one-pot electrochemical fabrication process with high controllability, which exhibits high robustness, Li affinity and fast Li transfer, and significantly outperforms the single lithiophilic interphase obtained via chemical route. When this advanced interphase is applied to the copper or aluminum electrodes, great stabilizations of Li plating/stripping or Li insertion/extraction processes can be achieved. This work emphasizes the importance of the interphase composition for designing stable high-energy-density electrodes, and gives insights on a general and efficient remedy to boost the performances of the large-volume-change electrodes.
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JOURNAL OF MOLECULAR MODELING
·
2021
·Vol. 27
·期 6
·1-8
·
IF 1.81
Xu Shuhong,Tan Linfeng,Liu Fan,Cui Yiping,Wang Chunlei,Zhang Rong
Optical properties of N- and F-doping triangular-shaped carbon molecules have been investigated in theory and experiment. The theoretical results showed that carbon molecules with impurity F and Cl have the same characters with pure carbon. Doping N into pure carbon molecule would change the optical rotation at 589 nm. For doping N replacing hydrogen atom structures (N-doping 1 and N-doping 2 molecules), the absorption spectra of them are similar to pure carbon molecule. However, for molecules with impurity N atom in benzene ring (N-doping 3 and N-doping 4 molecules), the peaks of wavelength of absorption spectra shift to long wavelength compared to that of pure carbon molecule. Moreover, the delocalization of molecular orbital (MO) is different from pure carbon molecule, which is caused by the impurity N changing the electrons distribution of benzene ring. We have calculated 3 without H and 4 without H molecules which are removing hydrogen atom in nitrogen atom from N-doping 3 and 4. 3 without H and 4 without H molecules have similar optical properties with pure carbon molecule. The results testified that the impurity N and F would not change the optical properties of carbon molecule if impurity did not change the delocalization of all benzene rings. Graphical abstract
Optical properties of nitrogen- and fluorine-doping carbon molecules investigating in theory and experiment.
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高影响因子
CERAMICS INTERNATIONAL
·
2021
·
IF 4.527
Mengting Jiang,Liwen He,Chao Duan,Xiaoping Ouyang
Poor fracture toughness is a major limitation of SiC ceramics, which greatly affects their application range. Herein, a novel strategy is proposed to enhance the fracture toughness of SiC ceramics by cross-linking carbon nanotubes (CNTs) coated with polydopamine (PDA) to Ti 3 C 2 modified with 3-glycidyloxypropyltrime-thoxysilane (KH560) (PDA-CNTs@f-Ti 3 C 2 ). Then, PDA-CNTs@f-Ti 3 C 2 was added to SiC powder to prepare the final composite. The influence of PDA-CNTs@f-Ti 3 C 2 addition on the microstructure and mechanical properties of the SiC composite is discussed. The results showed that, compared with CNTs and Ti 3 C 2 , the PDA-CNTs@f-Ti 3 C 2 composites exhibited better dispersibility in water. The flexural strength was significantly enhanced (~89%) in the SiC composite containing 3 wt% PDA-CNTs@f-Ti 3 C 2 , from 228.99 MPa to 433.55 MPa. The fracture toughness of the SiC composite containing 3 wt% PDA-CNTs@f-Ti 3 C 2 improved by 62%, from 3.97 MPa/m 1/2 to 6.44 MPa/m 1/2 .
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Iranian Journal of Biotechnology
·
2020
·
IF 0.973
Shuang Feng Li,Huai Wang,Jia Li Chen,Hui Xia Zhu,Ri-Sheng Yao,Huan Wu
Background: Lignin is the largest natural aromatic polymer in nature and is also a unique aromatic-based biopolymer, accountingfor nearly 30% of the earth’s organic carbon. Generally, lignin is regarded as waste and is mainly used as a low- valuefuel that is burned to generate heat and energy to solve the problem of biomass waste; for this obstacle of lignin,highly efficient biodegradation plays a critical role in developing an environmentally friendly technique for lignin biotransformation. Objectives: This study intends to isolate and purify several microbial strains from nature. It also explores how their lignin degradationis able to enhance the biodegradation and recycling of biomass and the reclamation of lignin in wastewater from pulp and paper mills. Materials and Methods: Lignin-degrading microbial strains were isolated from soil using medium containing sodium lignosulphonate as the sole carbonsource. They were then screened by aniline blue and guaiacol plate, and then the best strain was chosen and identified.The conventional one-factor method was used to optimize various parameters that affect lignin’s degradation ability. Results: The strain possessing the highest lignin biodegradation ability was identified and denominated as Aspergillus Flavus F-1. After optimization, the maximum degradation rate of lignin, 44.6% within 3 days, was obtained at pH 7.0, 30 ℃, 2.5 g·L -1 ammoniumsulfate, 2 g·L -1 lignin and 0.5 g·L -1 glucose. The results show the LiP and Lac secreted from Aspergillus Flavus F-1 played the main role in the degradation of lignin. Conclusion: One microbial strain, Aspergillus Flavus F-1, was successfully isolated with a lignin-degrading abilitythat can cut the lignin into fragments. This provides a promising candidate for the transformation and utilization of crop waste biomass for various industrial purposes.
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ACS Applied Materials & Interfaces
·
2020
·
IF 8.758
Yuanqin Li,Kang Wang,Jiawei Chen,Wenguang Zhang,Xuehuan Luo,Zhangmin Hu,Qiankui Zhang,Lidan Xing,Weishan Li
High-voltage cathodes provide a promising solution to the energy density limitation of currently commercialized lithium-ion batteries, but they are unstable in electrolytes during the charge/discharge process. To address this issue, we propose a novel electrolyte additive, pentafluorophenyltriethoxysilane (TPS), which is rich in elemental F and contains elemental Si. The effectiveness of TPS has been demonstrated by cycling a representative high-voltage cathode, LiNi0.5Mn1.5O4 (LNMO), in 1.0 M LiPF6–diethyl carbonate/ethylene carbonate/ethyl methyl carbonate (2/3/5 in weight). LNMO presents an increased capacity retention from 28 to 85% after 400 cycles at 1 C by applying 1 wt % TPS. Further electrochemical measurements combined with spectroscopic characterization and theoretical calculations indicate that TPS can not only construct a robust protective cathode electrolyte interphase via its oxidation during initial lithium desertion but also scavenge the detrimental hydrogen fluoride (HF) present in the electrolyte via its strong combination with the species HF, F–, and H+, highly stabilizing LNMO during the charge/discharge process. These features of TPS provide a new solution to the obstacle in the practical application of high-voltage cathodes not limited to LNMO.
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高影响因子
TOPICS IN CATALYSIS
·
2017
·Vol. 60
·期 12
·980-986
·
IF 2.486
Zhang Xiuling,Li Zhuang,Zhan Zhibin,Di Lanbo
F-Doped TiO 2 was successfully fabricated using gas–liquid cold plasma with different fluorine sources, including NaF, NaF combined with [C 4 MIM]HSO 4 , and [C 4 MIM]BF 4 . The samples were characterized by XRD (X-ray diffraction), XPS (X-ray photoelectron spectroscopy), and BET (N 2 adsorption–desorption isotherms). Photocatalytic activity of the samples was tested by degradation of methylene blue (MB) dye under simulated sunlight. The results show that doping with different fluorine sources was beneficial to form interstitial F-doped TiO 2 , and ionic liquids used in our work were most favorable to the formation of interstitial F-doped TiO 2 . Calcination of the 0.6-F–[C 4 MIM]BF 4 –TiO 2 sample at 500 °C shows that interstitial F-doped TiO 2 has an excellent thermal stability, a suitable mesoporous structure, higher specific surface area (60.5 m 2 g −1 ) and the best photocatalytic activity. MB degradation was about 98% under the stimulated sunlight for 30 min, and its apparent rate constant was 42 times higher than photolysis and was about 2.9 times as that prepared without addition of ionic liquid. Furthermore, the stability of ionic liquids in the gas–liquid plasma was also investigated and discussed with the assistance of Fourier transform infrared (FTIR) spectroscopy.
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JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
·
2025
·
IF 6.2
Yuan-Bin Chen,Ling Tang,Xiuyuan Su
Low-temperature sintered microwave dielectric ceramics are gaining increasing attention for next-generation wireless communication systems, particularly within the 6 G frequency range. However, materials that simultaneously exhibit ultra-low dielectric loss and low sintering temperatures remain scarce. In this study, Nd 2 [Zr 1-X (Bi 0.5 Ta 0.5 ) X ] 3 (MoO 4 ) 9 ceramics were prepared via a conventional solid-state reaction method and exhibited a single-phase structure with a trigonal symmetry (space group R 3 ¯ C, No. 167). The optimal sample at x = 0.11 sintered at 750 ℃ showed excellent performance: ε r = 11.4, Q×f = 186,300 ± 8900 GHz, and τ f = –42.9 ppm/℃. The elevated Q×f value is chiefly ascribed to increased lattice energy, with its variation more plausibly arising from intrinsic effects within the material. The dielectric constant (εᵣ), analyzed using the Clausius–Mosotti equation, was predominantly influenced by ionic polarizability. According to P–V–L theory, the effective bond strength f iNd–O played a major role in determining εᵣ, while τ f was governed by the bond energy and thermal expansion behavior of Mo–O bonds. Raman spectroscopy further confirmed the structure–property relationships. These results suggest that B-site substitution with (Bi 0.5 Ta 0.5 ) 4+ not only promotes densification and increases lattice energy, but also maintains thermal stability, thereby enhancing Q×f without compromising τ f . This system offers strong potential for integration into future microwave dielectric components.
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ZEITSCHRIFT FUR KRISTALLOGRAPHIE-NEW CRYSTAL STRUCTURES
·
2023
·Vol. 238
·期 6
·1069-1070
·
IF 0.3
Yan-Qing Wang,Wen-Qing Yan,Li-Xue Nie,Ping-Ping Luan,Chao-Qun Li
C 20 H 22 Cu 3 N 8 O 10 , monoclinic, C 2/ c (no. 15), a = 12.0766(11) Å, b = 16.2778(14) Å, c = 14.7605(13) Å, β = 97.8580(10) ∘ , V = 2874.4(4) Å 3 , Z = 4, R
gt ( F ) = 0.0420, wR
ref ( F
2 ) = 0.0988, T = 298.15 K.
研究领域:
无机化学
·
晶体学
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ELECTROCHIMICA ACTA
·
2020
·
IF 6.215
Xiaoqing Liu,Guangshe Li,Dan Zhang,Lingshen Meng,Baoyun Li,Liping Li
Li 3 VO 4 is one of the most promising candidates for high performance lithium-ion batteries due to its high specific capacity and excellent ionic conductivity , while its practical applications are hindered, because of its inferior rate capability. Herein, we adopted an anionic doping strategy to improve electronic conductivity, cycling stability and accelerate electrochemical kinetics. A series of F − doped Li 3 VO 4 samples were synthesized by a modified sol-gel method for the first time. F − doping led to the appearance of oxygen vacancies and reduced band gap, which effectively improve electronic conductivity. Complete structural rearrangement and optimized SEI layers also occurred during cycling, beneficial for stable lifetime. As a consequence, long cycle life (cycling 1100 loops at 500 mA g −1 except for the first 5 loops at 100 mA g −1 ) and optimized rate capability (255 mA h g −1 at 1000 mA g −1 ) were achieved for 5 at% F doping, which are superior to those for undoped samples. This work demonstrates that anion doping is a feasible strategy to accelerate electrons/ions transfer and improve cycling stability of Li 3 VO 4 .
研究领域:
材料科学
·
电化学
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JOURNAL OF POWER SOURCES
·
2026
·
IF 7.9
Li-Qian Cheng,Yi Gong,Jiangyun Ding,Jingye Pan,Kai Chen,Xuxia Hao,Yu Dai,Min Jiang,Xinyuan Xie,Fan Yang,Ruiping Liu
High-manganese-to-iron-ratio lithium manganese iron phosphate (LMFP) is a promising candidate for next-generation electric vehicle cathodes due to its high energy density, low cost, and safety. However, its poor cycling reversibility, especially at elevated temperatures, has limited its practical application, which is mainly due to the Jahn-Teller effect and Mn-ion dissolution. Ion doping is a commonly used modification method. Herein, in this work, a novel V/F co-doping and Mn 2+ capture membrane coated with CNT-doped hydroxyapatite (HAP-C) were employed to modify LMFP. The V/F co-doped LMFP showed enhanced structure stability during cycling tests compared to LMFP, and the capacity retention rate increased to 89.5 % after 300 cycles at 1C/1C. Meanwhile, the Mn 2+ -capturing separator further protected the anode stability by preventing the deposition of dissolved manganese ions. Due to these combined properties, the doped cathode battery using the HAP-C modified separator exhibited less manganese deposition on the anode. After 300 cycles at 1C/1C, 25 °C, the capacity retention rate further improved to 96.7 %, and after 300 cycles at 0.5C/0.5C, 45 °C, the capacity retention rate increased to 84.0 %, demonstrating outstanding cycling stability. This comprehensive strategy provides a basis for developing high-energy-density and long-cycle-life lithium-ion battery.
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COMPOSITES SCIENCE AND TECHNOLOGY
·
2021
·
IF 8.528
Xu Xu,Yuting Ouyang,Shaorong Lu,Hong Ruan,Yuqi Li
Triboelectric nanogenerator (TENG) with flexibility, recyclability , and high mechanical performance are highly desirable for self-powered active motion sensors. Herein, maleic anhydride and furan groups were introduced into the polyurethane and SiO 2 , respectively, to obtain furan modified SiO 2 (F–SiO 2 ) and maleic anhydride modified polyurethane (MPU). The dynamic crosslinked F–SiO 2 /MPU composites (FM) possessed the recyclability due to the Diels-Alder reaction. In addition, the mechanical properties of FM were improved due to the improvement of the interface compatibility between F–SiO 2 and MPU. Especially, at 5 wt% content (FM-5), the tensile strength and elongation at break are 7.09 MPa and 845.61%, respectively. Compared with pure MPU, it has increased by 249.26% and 176.30%, respectively. Additionally, at 3 wt% F–SiO 2 content, the short-circuit current ( Isc ), open circuit voltage ( Voc ), transferred charge ( Qsc ) and peak power density of FM-3 increased by 18.60%, 36.04%, 49.24% and 13.00%, respectively. This work offers new insights into the design and preparation of triboelectric nanogenerator for self-powered active motion sensors with flexibility, and recyclability.
研究领域:
材料科学
·
能源技术
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