Cell Reports Physical Science
·
2021
·
IF 0
Zhong Xu,Haitao Zhang,Tao Yang,Xiang Chu,Yanting Xie,Qungui Wang,Yuanhua Xia,Weiqing Yang
Naturally structural and chemical interface instability between solid-state electrolyte (SSE) and Li anode is still a bottleneck for the suppression of Li dendrites to date. Herein, we design the 3D in situ -fluorinated perovskite-type electrolyte hybridized with poly (ethylene oxide) fibers (F-LLTO@PEO) for the synergistically enhanced physicochemical-interface stability. The rapidly Li-ions-transporting and high shear modulus 3D skeleton-structured SSE can physically suppress Li dendrite growth, while the LiF-rich solid-state electrolyte interface (SEI) layer of the in situ fluoridated SSE can chemically eliminate the security risk of Li dendrites. This unique SSE exhibits a high ionic conductivity of 5 × 10 −4 S cm −1 at 25°C. Based on the above, the as-developed solid-state lithium metal batteries (SSLMBs) possess excellent rate-capability of 95 mAh g −1 @ 5 C and cycling stability over 80% after 100 cycles at 90°C. Evidently, this physicochemically dendrite-suppressed strategy will open a previously unexplored opportunity in developing safe, high-performance SSLMBs.
研究领域:
材料科学
·
电化学
·
储能技术
·
纳米技术
✓ 已验证
DOI
Nanomaterials
·
2021
·Vol. 11
·期 12
·3393
·
IF 5.076
Shasha Qu,Wenbin Wu,Yunfan Wu,Yanping Zhuang,Jie Lin,Laisen Wang,Qiulong Wei,Qingshui Xie,Dong-Liang Peng
Lithium cobalt oxide (LCO) is the most widely used cathode materials in electronic devices due to the high working potential and dense tap density, but the performance is limited by the unstable interfaces at high potential. Herein, LiF thin film is sputtered on the surface of LCO electrodes for enhancing the electrochemical performance and reducing the voltage polarization. The polarization components are discussed and quantified by analyzing the relationship between electrochemical polarization and charger transfer resistance, as well as that between concentration polarization and Li-ion diffusion coefficients. In addition, the decreased charge transfer resistance, increased lithium-ion diffusion coefficients, and stabilized crystal structure of LiF-coated LCO are confirmed by various electrochemical tests and in-situ XRD experiments. Compared to that of pristine LCO, the capacity and cycling performance of LiF-coated LCO is improved, and the overpotential is reduced upon cycling. This work provides reference for quantifying the various polarization components, and the strategy of coating LiF film could be applied in developing other analogous cathode materials.Keywords:voltage polarization;lithium cobalt oxide;lithium fluoride;lithium-ion battery
研究领域:
材料科学
·
电化学
✓ 已验证
DOI
PubMed
高影响因子
JOURNAL OF APPLIED ELECTROCHEMISTRY
·
2024
·
IF 2.4
Li Mei,Du Rui,Wei Hedi,Chen Jiayi,Liu Rugeng,Zhang Meng,Han Wei
In order to investigate the influences of the additive (KF) on electrochemistry and deposit morphology of Pr, various electrochemical techniques were used to comparative investigate the electroreduction potential and diffusion coefficient of Pr 3+ and kinetic properties of Pr 3+ /Pr in LiCl–KCl-PrCl 3 before and after the addition of KF at different molar concentration ratios of F − to Pr 3+ ( k ). Cyclic voltammetry, square wave voltammetry, and reverse chronopotentiometry results showed that the value of k ( k = 0, 1, 2, 3, and 4) had no effect on reduction mechanism of Pr 3+ . With the increase of k , the reduction peak potential moved in the negative direction, the diffusion coefficient decreased, and diffusion activate energy increased. Meanwhile, the exchanged current densities ( j 0 ), charge transfer resistances ( R ct ), and activate energies ( E a ) were measured at different k by linear polarization technique, which illustrated that with the increase of k , j 0 gradually decreased, and E a and R ct increased. Furthermore, the electrochemical preparation of Pr aided by KF was explored by potentiostatic electrolysis at different k , and the products were characterized by XRD, SEM, and EDS, which indicated that with the increase of k , the morphology of metallic Pr changed from slender needles to granular. Graphical abstract
研究领域:
材料科学
·
电化学
✓ 已验证
产品关联
DOI
高影响因子
Materials
·
2020
·Vol. 13
·期 17
·3871
·
IF 3.057
Bingbing Wan,Wenfang Li,Wanting Sun,Fangfang Liu,Bin Chen,Shiyao Xu,Weiping Chen,Aihua Yi
Secondary aluminum dross (SAD) is regarded as a solid waste of aluminum recycling process that creates serious environmental and health concerns. However, SAD can also be used as a good source of aluminum, so that utilizing the SAD for the production of valuable products is a promising approach of recycling such waste. In the present work, a novel eco-friendly three-step process was proposed for the synthesis of cryolite (Na3AlF6) from the SAD, and it consisted of (1) water-washing pretreatment of SAD, (2) extraction of Al component via pyro-hydrometallurgy, including low-temperature alkaline smelting, water leaching and purification of leachate in sequence, (3) precipitation of cryolite from the purified NaAlO2solution using the carbonation method. By analysis of the parameter optimization for each procedure, it was found that the maximum hydrolysis efficiency of aluminum nitride (AlN) in the SAD was around 68.3% accompanied with an extraction efficiency of Al reaching 91.5%. On this basis, the cryolite of high quality was synthesized under the following optimal carbonation conditions: reaction temperature of 75 °C, NaAlO2concentration of 0.11 mol/L, F/(6Al) molar ratio of 1.10, and 99.99% CO2gas pressure, and flow rate of 0.2 MPa and 0.5 L/min respectively. The formation of Na3AlF6phase can be detected by XRD. The morphological feature observed by SEM revealed that the as-synthesized cryolite had a polyhedral shape (~1 μm size) with obvious agglomeration. The chemical composition and ignition loss of the as-synthesized cryolite complied well with the requirements of the Chinese national standard (GB/T 4291-2017).
研究领域:
材料科学
·
环境工程
✓ 已验证
DOI
高影响因子
Inorganic Chemistry Frontiers
·
2023
·Vol. 11
·期 1
·172-185
·
IF 7
Kejie Li,Mengmeng Dai,Zuoling Fu,Zhiying Wang,Hanyu Xu,Rong Wang
Fluorides have garnered tremendous attention in rare-earth-doped fluorescent probes owing to their low phonon energy and excellent optical transparency. However, the latest generation of fluorides, LiYF4, is plagued by extremely complex and uncontrollable synthesis methods, which greatly restricts its further exploration and application. Herein, a straightforward one-step method for the synthesis LiYF4:Ln3+ with micron-sized cones and nano-spheres is reported. Astonishingly, self-sensitized luminescence was achieved under multi-wavelength excitation when Er3+ was singly doped. LiYF4:Yb3+,Er3+ demonstrated superior luminescence intensity to those of commercial green phosphors (NaYF4:Yb3+,Er3+); this ultra-efficient photoluminescence was confirmed from the crystal structure, electronic band properties, morphological analysis and Debye temperature calculations. Further, by constructing cross-relaxation between the Ce3+ and Er3+ ions (4I11/2 + 2F5/2 → 4I13/2 + 2F7/2), the specific four-peak emission (SFPE) intensity of Er3+ in NIR-IIb was significantly increased, further enhancing the relative sensitivity of thermally coupled temperature sensing based on SFPE. Subsequently, non-thermally coupled temperature sensing based on SFPE was also achieved through the construction of phonon-assisted energy transfer between Ho3+ 5I6 and Er3+ 4I13/2. In summary, this paper not only puts forward theoretical and experimental arguments for the use of LiYF4 to replace the conventional NaYF4, but also substantiates the extraordinary prospects of LiYF4 as a temperature-sensitive fluorescent probe in nanomedicine.
研究领域:
材料科学
·
纳米医学
✓ 已验证
DOI
高影响因子
CERAMICS INTERNATIONAL
·
2020
·
IF 3.83
Yitong Guo,Sen Jin,Libo Wang,Pingge He,Qianku Hu,Li-Zhen Fan,Aiguo Zhou
In this study, highly pure Mo 2 CT x MXene was successfully synthesized from Mo 2 Ga 2 C by etching in hydrothermal conditions for 24 h at 140–180°C. The etching solutions were lithium fluoride (LiF), sodium fluoride (NaF), potassium fluoride (KF) or ammonium fluoride (NH 4 F) mixed with hydrochloric acid (HCl). The temperature to obtain pure Mo 2 CT x MXene in NH 4 F + HCl solution was 140°C, lower than that in other etching solutions. The thickness of as-prepared monolayer Mo 2 CT x nanosheet was measured to be 1.5 ± 0.3 nm by atomic force microscope. From thermogravimetry and differential thermal analysis, Mo 2 CT x MXene was found to be stable in argon atmosphere at a temperature of up to 500°C. As the temperature increased, Mo 2 CT x MXene gradually transformed, and β-Mo 2 C/MoC/Mo 3 C 2 was eventually formed to coexist with Mo 2 CT x MXene at 700°C. In air atmosphere, Mo 2 CT x MXene was stable at 200°C. At 590°C, Mo 2 CT x MXene was completely oxidized to MoO 3 .
研究领域:
材料科学
·
化学
✓ 已验证
产品关联
DOI
高影响因子
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
·
2020
·
IF 3.99
Zhiqiang Liu,Jiang Wu,Jianmin Wang,Run Wang,Guolong Liu,Yongfeng Qi,Weixin Xu,Guangqian Luo,Minghou Xu
The morphology of the catalyst is one of the important factors affecting the photocatalytic activity. In this work, fluoride-mediated TiO 2 with different morphologies was successfully prepared based on Ostwald ripening. In particular, the morphology and structure of the TiO 2 sample can be adjusted according to different ionic environments. Combining experiments and characterization, the regulation mechanism of different fluorides on the morphology and structure of TiO 2 was proposed, and the transport behavior of photogenerated carriers was evaluated. The results show that the morphology and structure have a greater impact on the photocatalytic activity of TiO 2 . The hollow structure can promote the separation and transfer of carrier and enhance the light collection ability. The surface fluoride as an electron trap can reduce the carrier recombination rate, which is beneficial to the photocatalytic activity of the as-prepared sample. The hollow structure sample shows a good photocatalytic efficiency in the photocatalytic removal of Hg 0 in the gas phase, reaching about twice the commercial P25. Finally, the photocatalytic mechanism of the catalyst and the electron-hole migration path are proposed. This research provides new ideas for the design of hollow TiO 2 microspheres, which can be widely used in the field of catalysis.
研究领域:
材料科学
·
环境科学
✓ 已验证
产品关联
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2014
·
IF 4.058
Jing Wang,Xiaoyan Lin,Xuegang Luo,Yufeng Long
A novel sorbent for the removal of fluoride is prepared by immobilizing Zr(IV) on carboxymethyl cellulose sodium (CMC-Zr). Batch adsorption experiments are performed on factors of pH, temperature, initial fluoride concentration, adsorbent dosage and contact time to evaluate the adsorption capacity. The results show that the saturation adsorption capacity is 47 mg/g at pH 4.0, 25 °C, concentration 300 mg/L for 24 h. Adsorption process could be well described by Langmuir isotherm model. The adsorption kinetic data is fitted well with pseudo-second-order model. Thermodynamic parameters are also evaluated and the results indicate that adsorption of fluoride on CMC-Zr is a spontaneous and endothermic process. The mechanism of modification and adsorption process on CMC-Zr is analyzed by FT-IR, SEM-EDX and XPS. Results show that Zr(IV) is loaded on CMC through ion exchange of sodium of CMC and surface adsorption, coordination reaction happened during the adsorption process between CMC-Zr and fluoride. CMC-Zr adsorbent is a promising adsorbent for the removal of fluoride from aqueous solutions.
研究领域:
环境科学
·
化学工程
✓ 已验证
产品关联
DOI
高影响因子
European Journal of Wood and Wood Products
·
2014
·Vol. 73
·期 1
·97-102
·
IF 1.105
Pan Chengyuan,Ruan Guanhua,Chen Haihong,Zhang Dayu
Wood preservation is one of the most effective methods to prevent damage caused by termites. Sodium fluoride (NaF) is a well-known fungicide for preventing decay in timber due to its excellent diffusion in wood. In this study, the toxicity of NaF to the termites Reticulitermes flaviceps and its potential leachability as wood preservative were assessed. While termites were in contact with NaF-treated filter paper in a Petri dish for nine days, termites were found completely dead while the papers were treated by NaF at concentration of 0.5 % (wt/wt) or above. Wood blocks of Pinus massoniana were treated with five different concentrations of NaF (0.1, 0.25, 0.5, 1 and 2 %) respectively, and then exposed to a non-soil-contact field leaching experiment. After 4 weeks, retention levels of NaF in the wood blocks dropped from 0.075–0.834 % to 0.057–0.284 %. A choice test, in which NaF-treated and untreated wood blocks were exposed to the termites R. flaviceps was conducted. The results showed NaF, even at retention of 0.057 % (wt/wt), could significantly inhibit termite feeding in the treated blocks. The results suggest that NaF is a suitable wood preservative with anti-feedant activity against termites.
研究领域:
昆虫学
·
林学
✓ 已验证
产品关联
DOI
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
·
2016
·
IF 3.299
Chenglong Shi,Yan Jing,Jiang Xiao,Xingquan Wang,Ying Yao,Yongzhong Jia
Two non-fluorinated ionic liquids (ILs), namely tetrabutylammonium bis(2-ethylhexyl)-phosphate, [N 4444 ][DEHP], and tetraoctylammonium bis(2-ethylhexyl)-phosphate, [N 8888 ][DEHP], were synthesized and fully characterized by 1 H and 13 C NMR spectroscopy. These functionalized ILs were subsequently evaluated in terms of their ability to extract lithium ions from aqueous solution. The extraction efficiencies of these functionalized ILs for lithium ions were measured as a function of various extraction parameters, including aqueous acidity, temperature and extractant concentration. The extracted species were determined using a slope analysis method, which indicated that the ILs formed a 1:1 (metal:ligand) complex. Fourier transform infrared spectroscopy studies were conducted to better understand the nature of the extracted species. We also investigated the stripping of the lithium ions from the organic phase and the re-use of the ionic liquid in a subsequent extraction step.
研究领域:
化学
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
CARBON
·
2015
·
IF 6.196
Guoxin Zhang,Kang Zhou,Ruoyu Xu,Hekai Chen,Xiaoke Ma,Biao Zhang,Zheng Chang,Xiaoming Sun
In this study, we report a potentially scalable strategy for the cost/time-efficient production of water-soluble functionalized few layered graphene (FcG) through the mild defluorination of graphite fluoride (GF) at room temperature (RT). The strategy includes mechanical milling which is of high simplicity and operability, and subsequently water purification . By using heteroatom-containing alkaline such as NaNH 2 and Na 2 S, N or S dopants can be functionalized into the defluorinated graphene, leading to the formation of N- and S-doped FcG, respectively. Our methodology of defluorination of GF allows the fabrication of water soluble FcG in much safer ways relative to the conventional Hummers' method that involves strong acidic/oxidative ambience and disposal of large amount of salt wastes. Meanwhile, the abundance of GF and the simplicity of processibility may also facilitate the practical uses of FcG obtained via our methodology.
研究领域:
材料科学
·
化学工程
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2020
·
IF 4.65
Tianping Huang,Jianxin Zou,Huabing Liu,Wenjiang Ding
Three kinds of transition metal fluorides TMF x (TM = Nb, Co, Ti) were introduced into the 3NaBH 4 -GdF 3 hydrogen storage system via mechanical milling. Their effects on the hydrogen storage behaviors of 3NaBH 4 -GdF 3 were systematically investigated by means of DSC and volumetric methods. All TMF x exhibited promoting effect on hydrogen desorption properties of 3NaBH 4 -GdF 3 to different degrees, especially when NbF 5 or TiF 3 was added. For example, the hydrogen desorption peak temperature was decreased by 17 °C with doping 3 mol% of NbF 5 . Besides, TiF 3 improved also the hydrogen absorption capacity and reversibility of 3NaBH 4 -GdF 3 . Based on XRD analyses, the role of TMF x on the dehydrogenation and the promoting effect of TiF 3 on the reversibility of 3NaBH 4 -GdF 3 were clarified. This work helped to understand the combination effect of rare earth metal fluoride (GdF 3 ) and transition metal fluorides on the reversible hydrogen storage properties of NaBH 4 .
研究领域:
材料科学
·
化学工程
✓ 已验证
产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）