INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
·
2023
·
IF 8.2
Xinghui Wu,Lina Yang,Mingjie Xia,Kejin Yu,Wenqi Cai,Taiyuan Shi,Mengxi Xie,He Liu
The stable energy barrier of mucin and soy hull polysaccharide (SHP) is established at the air/water interface in the intestinal fluid and is conducive to the absorption and transportation of nutrients. This study aimed to investigate the effect of different concentrations (0.5 % and 1.5 %) of Na + and K + on the energy barrier through the digestive system model in vitro . The interaction between ions and microwave-assisted ammonium oxalate-extracted SP (MASP)/mucus was characterized by particle size, zeta potential, interfacial tension, surface hydrophobicity, Fourier transform infrared spectroscopy, endogenous fluorescence spectroscopy, microstructure, and shear rheology. The results showed that the interactions between ions and MASP/mucus included electrostatic interaction, hydrophobic interaction, and hydrogen bond. The MASP/mucus miscible system was destabilized after 12 h, and the ions could improve the system stability to some extent. MASP aggregated continuously with the increase in the ion concentration, and large MASP aggregates were trapped above the mucus layer. Furthermore, the adsorption of MASP/mucus at the interface increased and then decreased. These findings provided a theoretical basis for an in-depth understanding of the mechanism of action of MASP in the intestine.
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ORGANIC ELECTRONICS
·
2019
·
IF 3.495
Wu Tang,Hengyang He,Jianyou Shi,Bei Cao,Chuluo Yang,Cong Fan
Poly( N -vinylcarbazole) (PVK) containing the electron-rich carbazole moiety is exploited as a high-potential and high-capacity organic polymer cathode for dual-intercalation Na-ion batteries, which exhibits redox potential in the range of 2.5–4.6 V (vs. Na + /Na) and theoretical specific capacity of ~138 mAh g −1 . After proper optimizations, PVK can deliver average discharge capacities of ~110 mAh g −1 for 100 cycles under a low current density (50 mA g −1 ) and ~62 mAh g −1 for 900 cycles under a high current density (0.5 A g −1 ) using 1 M NaPF 6 in ethylene carbonate (EC) and diethyl carbonate (DEC).
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Nano Energy
·
2017
·
IF 12.343
Qun Huang,Jiatu Liu,Li Zhang,Sheng Xu,Libao Chen,Peng Wang,Douglas G. Ivey,Weifeng Wei
The major hurdle of room temperature sodium-ion batteries (NIBs) for large-scale energy storage applications lies in developing new electrode materials with higher energy/power densities and improved durability. This work presents a novel Na-P3/Li 2 MnO 3 layered composite cathode with an alternating heteroepitaxial nanostructure fabricated by an in-situ composition modulation route. XRD structural refinement, synchrotron XAS and aberration-corrected HAADF-/ABF-STEM were employed to understand the structure evolution accompanying Li substitution. It is revealed that the in-situ formation of Li 2 MnO 3 (Li-O’3) changes the crystallographic and chemical features of the neighboring Na-P3 layered matrix significantly and leads to the alternating Na-P3/Li-O’3 heteroepitaxial nanostructure. This alternating heteroepitaxial nanostructure delivers an extremely high reversible capacity of ~ 210 mAh g −1 between 1.5 and 4.5 V vs. Na/Na + , much improved cycling stability and excellent electrode kinetics . Its enhanced electrochemical performance can be ascribed to the effective suppression of the P3-P3’’ phase transition and subsequent amorphization upon cycling to 4.5 V.
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JOURNAL OF CHEMICAL AND ENGINEERING DATA
·
2022
·
IF 3.119
Li-Rong Guo,Guo-Liang Nie,Rui-Zhi Cui,Wu Li,Yong-Ming Zhang
In addition to the common sodium salt, potassium salt, magnesium salt, and sulfate, salt lake brine is also rich in trace components in varying degrees, such as lithium, bromine, rubidium, cesium, and so forth, which is of great industrial value. These trace components are further concentrated and enriched in old brine during the process of evaporation and concentration of brine resources. In view of the coexistence characteristics of lithium, potassium, bromine, and other ions in old halide, the phase equilibria of quinary system Li+, Na+, K+/Br–, and SO42––H2O were studied by the isothermal dissolution equilibrium method at 298.15 K. The solubility data of the equilibrium liquid phase were measured, and the compositions of the solid phase as well as the crystal forms of the equilibrium solid phase were identified when the equilibrium was achieved. The corresponding 3D and dry-base phase diagrams (Na2SO4·10H2O, K2SO4, LiBr·2H2O, Li2SO4·H2O, KBr, and NaBr·2H2O saturated) were drawn based on the phase equilibrium experimental data. The research results of phase equilibria and phase diagrams reveal that the phase relations and crystallization–dissolution law of each component in solution lay a certain foundation for further research on multi-temperature phase equilibrium and thermodynamic properties of the high-component brine system and to provide basic thermodynamic data for guiding the rational development and comprehensive utilization of brine resources.
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Advanced Science
·
2022
·Vol. 9
·期 7
·2103724
·
IF 17.521
Xingwen Cheng,Zhi Xie,Wei Zheng,Renfu Li,Zhonghua Deng,Datao Tu,Xiaoying Shang,Jin Xu,Zhongliang Gong,Xingjun Li,Xueyuan Chen
Fundamental understanding of the effect of doping on the optical properties of 3D double perovskites (DPs) especially the dynamics of self-trapped excitons (STEs) is of vital importance for their optoelectronic applications. Herein, a unique strategy via Cu + doping to achieve efficient STE emission in the alloyed lead-free Cs 2 (Ag/Na)InCl 6 DPs is reported. A small amount (1.0 mol%) of Cu + doping results in boosted STE emission in the crystals, with photoluminescence (PL) quantum yield increasing from 19.0% to 62.6% and excitation band shifting from 310 to 365 nm. Temperature-dependent PL and femtosecond transient absorption spectroscopies reveal that the remarkable PL enhancement originates from the increased radiative recombination rate and density of STEs, as a result of symmetry breakdown of the STE wavefunction at the octahedral Ag + site. These findings provide deep insights into the STE dynamics in Cu + -doped Cs 2 (Ag/Na)InCl 6 , thereby laying a foundation for the future design of new lead-free DPs with efficient STE emission.
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Crystals
·
2022
·Vol. 12
·期 10
·1339
·
IF 2.67
Hui Han,Ying-Ying Wang,Xing-Chao Yu,Yan-Na Ma,Xuenian Chen
Alkali metal (M = Na, K) salts of the [CB11H12]−anion have attracted increasing attention in many fields such as catalysis and all-solid-state batteries. However, tedious and low-yielding synthetic methods have seriously limited their application in these fields. We developed a facile method for the direct synthesis of the unsolvated potassium and sodium salts of the [CB11H12]−anion in 66% and 68% yields, respectively, by reactions of Na[B11H14] with NaH/NaHMDS (sodium bis(trimethylsilyl)amide), CF3SiMe3in THF and K[B11H14] with KH, CF3SiMe3in DME. This method avoids the exchange of cation and significantly simplifies the reaction setup, thus enabling convenient large-scale synthesis. It is believed that this method will support further application of Na[CB11H12] and K[CB11H12] as solid electrolytes for an all-solid-state battery.Keywords:Na[CB11H12];K[CB11H12];Na[B11H14];K[B11H14];one-pot synthesis
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Small Methods
·
2021
·Vol. 5
·期 11
·2100765
·
IF 14.188
Ruizhe Li,Wujie Dong,Jun Pan,Fuqiang Huang
The transition metal oxides (TMOs) with high volumetric capacities are promising anodes for the future electronics, however, they usually suffer from severe capacity decay and poor rate capability. Carbon hybridization and nanosizing can resolve these challenges, yet these significantly compromise the volumetric capacity. Herein, both high capacity and long cycling stability are simultaneously achieved in the micrometer-sized Mo-based oxide particles by designing the dual conductive MoO 2 /β-MoO 3- x mosaics. The rational combination of the highly electronically conductive MoO 2 with the highly ionically conductive and open-structured β-MoO 3 achieves a promising volumetric capacity of 1742 mAh cm −3 , which is four times higher than the commercial graphite. Simultaneously, both stable cycling performance (87% retention after 500 cycles) and excellent rate capability (outperformed a majority of the MoO 2 -based anodes reported in literature) are obtained in the lithium-ion batteries. For the sodium-ion batteries, the composite exhibits three times higher Na + storage than pure MoO 2 . Moreover, the decisive role of the bond energy on the electrochemical performance of TMOs is also identified. This study may open up new perspectives for choosing and designing the TMO anodes with a high volumetric capacity for the practical applications.
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JOURNAL OF CHEMICAL AND ENGINEERING DATA
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2021
·
IF 2.694
Qing Hao,Huan Zhou,Mengli Zhang,Si Wu,Junfang Yang
Rare-earth ore concentrate is calcined at high temperature by the alkaline method, and the associated elements fluorine and phosphorus are enriched in the form of sodium fluoride and sodium phosphate in water elution. To separate and recover fluorine and phosphorus from the aqueous solution, the solid–liquid equilibrium behaviors of the quaternary systems Na+//F–, CO32–, PO43–-H2O and their two sub-ternary systems NaF-Na3PO4-H2O and Na2CO3-Na3PO4-H2O at 313.15 K were studied via the isothermal solubility phase equilibrium method. Solubility data, liquid density and pH, two complete isothermal phase diagrams of the ternary system, and one complete isothermal phase diagram of the quaternary system were obtained. The results showed that two double salts NaF·2Na3PO4·19H2O and Na3PO4·3Na2CO3·8H2O occurred in the respective ternary systems. Five solid species of one anhydrous salt of NaF, two hydrous salts of Na2CO3·H2O and Na3PO4·12H2O, and two double salts of Na3PO4·3Na2CO3·8H2O and NaF·2Na3PO4·19H2O were found in the quaternary system. The phase diagram of the quaternary system consisted of three invariant points, five crystallization regions, and seven univariate curves. Na3PO4 easily combined with NaF to form double salt NaF·2Na3PO4·19H2O, which occupied a larger phase region in the quaternary phase diagram. The increase in Na2CO3 will lead to the decrease in the solubility of Na3PO4 and NaF in the system.
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CHEMICAL ENGINEERING JOURNAL
·
2021
·
IF 13.273
Mewin Vincent,Venkata Sai Avvaru,Maciej Haranczyk,Vinodkumar Etacheri
Despite of their inexpensive and sustainable characteristics, practical application of Mg-Na hybrid batteries are limited due to the lack of high performance dual-ion compatible cathode materials. This is mainly due to the increased size of Na-ions and improved electrostatic repulsion resulting from the high charge density of Mg-ions. Herein, we report for the first time a fast charging and ultralong-life Mg-Na hybrid battery based on an extremely pseudocapacitive hierarchical bronze TiO 2 (TiO 2 -B) nanosheet cathode. This two dimensional cathode exhibited outstanding pseudocapacitance (up to 94%), specific capacities (195 mAh/g @ 25 mA/g), rate performance (140 mAh/g @ 1A/g), cycling stability (∼76% after 6000 cycles @ 1A/g), coulombic efficiency (∼100%) and fast-charging (∼8 min). These performances are vastly superior to the previously reported metal oxide type Mg-Na hybrid battery cathodes. Mechanistic investigations revealed Mg-Na dual-ion intercalation pseudocapacitance with no significant structural changes. Exceptional electrochemical performance of the TiO 2 -B nanosheet cathode is credited to the dominant pseudocapacitive Mg-Na dual-ion diffusion through the nanointerfaces resulting from the hierarchical microstructure of TiO 2 -B nanosheets. High surface area, ultrathin nature and mesoporous structure are also contributed as secondary factors by facilitating superior contact with the electrolyte solution. The demonstrated method of nanointerfaces induced pseudocapacitive Mg-Na dual-ion intercalation provides new opportunities for the development of high-performance Mg-Na hybrid batteries.
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ChemSusChem
·
2021
·Vol. 14
·期 18
·3815-3820
·
IF 8.928
Di Li,Wu Tang,Fan Tang,Jiaji Yan,Lvchuan Jing,Chuan Wang,Yichao Yan,Liang Xu,Cong Fan
Graphical One electrode fits all : The polyanionic organic compound 9,10-anthraquinone-2,6-disulfonate is used as a common cathode and metallic bismuth as a common anode to simultaneously assemble low-cost Na-ion and K-ion full cells. The Na-ion full cells deliver a peak discharge capacity of 139 mAh g −1 and the K-ion full cells can show a peak discharge capacity of 130 mAh g −1 at 0.5–3.0 V. Molecule-aggregation organic electrodes in principle have the capability for “single-molecule-energy-storage” in metal-ion rechargeable batteries, which indicates that the same organic electrode can be simultaneously applied to multiple metal-ion rechargeable batteries. In this study, the polyanionic organic compound 9,10-anthraquinone-2,6-disulfonate (Na 2 AQ26DS, 130 mAh g −1 ) is used as a common cathode and metal bismuth (Bi) as a common anode to simultaneously assemble low-cost Na-ion and K-ion full cells. The Na-ion full cells can deliver the peak discharge capacity of 139 mAh g −1 cathode at 0.5–3.0 V, and the K-ion full cells can show the peak discharge capacity of 130 mAh g −1 cathode at 0.5–3.0 V. These results are comparable to the best organic-based Na-ion and K-ion full cells reported to date.
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Frontiers in Chemistry
·
2021
·
IF 5.221
Tang Shibao,Zhang Xiaoping,Sui Yulei,Wang Bingjue,Li Jiangpeng,Wu Ling
Na2Fe0.6Mn0.4PO4F/C composite materials are synthesized with various carbon sources via a simple spray-drying method in this study, and the effect of carbon sources on structure, morphology, and electrochemical properties of Na2Fe0.6Mn0.4PO4F/C materials are investigated in detail. XRD and SEM results indicate that the reduction ability of carbon sources has a key impact on the structure and morphology of Na2Fe0.6Mn0.4PO4F/C composite materials. Among these Na2Fe0.6Mn0.4PO4F/C materials, the sample prepared with ascorbic acid presents a uniform hollow spherical architecture. Electrochemical analysis demonstrates that the Na2Fe0.6Mn0.4PO4F/C sample prepared with ascorbic acid has optimal electrochemical performance. The sample shows high discharge capacities of 95.1 and 48.1 mAh g−1 at 0.05C and 1C rates, respectively, and it exhibits an improved cycle stability (91.7% retention after 100 cycles at 0.5C), which are superior to Na2Fe0.6Mn0.4PO4F/C materials prepared with other carbon sources. This study demonstrates that the reduction ability of carbon sources significantly influences the electrochemical properties of fluorophosphate/C composite materials. This work also provides a promising strategy to obtain high performance cathode materials for sodium-ion batteries.
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ZEITSCHRIFT FUR ANORGANISCHE UND ALLGEMEINE CHEMIE
·
2015
·Vol. 641
·期 11
·1953-1958
·
IF 1.16
Yunsheng Liu,Dajiang Mei,Jingli Xu,Yuandong Wu
Sodium magnesium selenite NaMg 2 (OH)(SeO 3 ) 2 and rubidium zinc selenite RbZn 2 (OH)(SeO 3 ) 2 were prepared by hydrothermal reactions. The crystal structures of the title compounds were determined by single-crystal X-ray diffraction. NaMg 2 (OH)(SeO 3 ) 2 crystallizes in the orthorhombic space group Pnma (no. 62) with lattice parameters a = 13.1919(10), b = 6.0415(4), c = 8.2182(6) Å, and Z = 4 and RbZn 2 (OH)(SeO 3 ) 2 crystallizes in the triclinic space group P (no. 2) with lattice parameters a = 4.8698(5), b = 7.3446(8), c = 11.7796(12) Å, α = 82.554(3), β = 78.456(2), γ = 71.603(3)°,and Z = 2. The structure of NaMg 2 (OH)(SeO 3 ) 2 is a three-dimensional framework consisting of edge-sharing MgO 6 octahedra and trigonal pyramidal SeO 3 2– groups, whereas the structure of RbZn 2 (OH)(SeO 3 ) 2 is a two-dimensional layers structure consisting of corner-sharing [Zn 2 O 7 ] dimers linked by trigonal pyramidal SeO 3 2– groups. The compounds were characterized by the solid state UV/Vis/NIR diffuse reflectance, and FT-IR spectroscopy.
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