Journal of Materials Chemistry A
·
2021
·Vol. 9
·期 22
·13125-13134
·
IF 12.732
Xiaogang Niu,Jiale Qu,Youran Hong,Leqing Deng,Ruiting Wang,Meiying Feng,Jiangwei Wang,Liang Zeng,Qianfan Zhang,Lin Guo,Yujie Zhu
Potassium ion batteries (KIBs) are attracting increasing research interest as a potential low-cost energy storage system. Currently, the development of KIBs is mainly hindered by the poor cycle life of cathode materials, caused by the large K-ion-induced mechanical failure during charge–discharge. Herein, taking layered K0.5V2O5 as an example, we show that reducing the long-range structural order is an effective way to boost its K-ion storage performance. The obtained nanocrystalline K0.5V2O5·0.5H2O is capable of retaining 81% of its capacity after 200 cycles, outperforming its highly crystalline counterpart which only exhibits 33.3% capacity retention after 100 cycles. Detailed spectroscopic and electrochemical characterization techniques indicate that the charge storage mechanism is changed from battery-type intercalation accompanied by phase transition in the highly crystalline K0.5V2O5 to phase transition-free pseudocapacitive K-ion intercalation in the nanocrystalline K0.5V2O5·0.5H2O. Theoretical calculations further suggest that the interlayered water plays a critical role in suppressing the phase transition which mitigates the mechanical damage of the nanocrystalline sample, leading to its enhanced cycling stability. The present work will provide new insights to improve the cycling stability of other electrode materials for KIBs.
✓ 已验证
DOI
高影响因子
Nano Energy
·
2020
·
IF 16.602
Yuying Wu,Wenbin Fan,Zhangran Gao,Zheng Tang,Lin Lei,Xiaofan Sun,Yongle Li,Hong-Ling Cai,Xiaoshan Wu
The rapid development of organic-inorganic metal halides in optoelectronic devices has been considered a promising approach for light-emitting diodes. Mn-based halogen hybrids represent a class of fascinating luminescence functional materials . Up to date, studies on Mn-based metal halides remain blurry and suffer from instability and low photoluminescence quantum yield (PL QY). Here, the single crystalline of MEA(MnBr 4- x Cl x ) 2 (MEA=((CH 3 ) 4 N)((C 2 H 5 ) 4 N) 2 ·NH 4 , x = 0, 2, 3) were designed and constructed by a one-pot solution method for the first time, featuring brilliant green emissions under ultraviolet light and revealing PL QY up to 99 ± 1% with x = 3 at room temperature. The excellent luminescence is ascribed to the Mn 2+ d 5 configuration with the 4 T 1 – 6 A 1 transition. Moreover, the thermostability and anomalous photoluminescence (PL) behavior triggered by heat are modulated via varying halogen ratio Cl/Br. Particularly, MEA(MnBr 4 ) 2 has an ultrahigh melting up to 600 K, which is, as we know, the highest one among the Mn-based organic-inorganic hybrid compounds. Our findings not only present the outstanding performance of three crystals, but also highlight the potential of these compounds in optoelectronics.
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF CHEMICAL AND ENGINEERING DATA
·
2020
·
IF 2.369
Xue-ping Zhang,Wei Wang,Han-zhong Zhang,Shi-hua Sang
In this paper, the stable phase equilibrium data of the ternary system CaBr2-SrBr2-H2O at T = 273, 298, and 323 K and 101.3 kPa have been determined by isothermal the dissolution equilibrium method. The phase diagrams of them at the investigated temperatures have been drawn. It is found that the isothermal phase diagrams of the CaBr2–SrBr2–H2O system at T = 273, 298, and 323 K are classified as a simple co-saturation type consisting of an invariant point and two univariant curves. The equilibrium solid phases corresponding to an invariant point of the system were detected as CaBr2·6H2O + SrBr2·6H2O at 273 and 298 K and those identified as CaBr2·4H2O + SrBr2·6H2O at 323 K. In this system, calcium bromide exhibits a strong salting-out effect on strontium bromide. Furthermore, isothermal solubilities at three temperatures were compared and discussed.
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF MOLECULAR LIQUIDS
·
2020
·
IF 5.065
Kaiyu Zhao,Yafei Guo,Dan Li,Lingzong Meng,Tianlong Deng
Isopiestic molalities and water activities for the commercial absorption refrigerants LiBr and SrBr 2 at 288.15 K were accurately measured using an improved isopiestic method. And the solubilities for the absorption refrigeration systems were determined by the isothermal dissolution equilibrium method, meanwhile, the refractive indices and densities were measured. The Pitzer and HW model was used to correlate the measured water activities and solubilities, simulate the thermodynamic properties and predict the data in the phase equilibrium process for the absorption refrigeration systems, and the predicted data agreed well with the experimental solubilities. On the basis of the Pitzer ion-interaction parameters and solubility product constant ( K sp ) obtained in this work, the ion-interactions between alkali metal ions with Sr 2+ and phase equilibrium behaviors were illustrated on the molecular level, which could give an essential guide for the designing of absorption refrigeration system.
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF MOLECULAR LIQUIDS
·
2020
·
IF 5.065
Kui Wu,Yajun Li
Being an important synthetic monomer , isobutyramide (IBA) is employed as an intermediate for the synthesis of organic dyes and pharmaceuticals. It is well known that investigation of the solubility behavior of drugs and intermediates has become an extensive research topic in pharmaceutical development. In this work, the solid-liquid equilibrium (SLE) data of IBA in fifteen solvents, including methanol, ethanol, n -propanol, isopropanol, n -butanol, isobutanol , acetonitrile , chloroform, acetone, ethyl formate , methyl acetate , cyclohexanone , cyclopentanone , tetrahydrofuran and 2-butanone was measured with a static gravimetric method with the temperature ranging from 273.15 to 324.75 K under atmospheric pressure. The solubility of IBA increases with the rising temperature in all selected solvents. The ranking of solubility in various solvents is not in accordance with the order of solvent physicochemical properties, namely polarity index, dipole moment , dielectric constant and solubility parameter. The modified Apelblat equation, λh equation, nonrandom two-liquid (NRTL) model and the Wilson model were used to correlate the experimental data. Maximum root-mean-square deviation ( RMSD ) and relative average deviation ( RAD ) were 7.157 × 10 −3 and 1.80%, respectively. The λh equation presented less effective correlating results compared with other three models. The dissolution properties of IBA, including Gibbs energy (△ dis G ), molar enthalpy (△ dis H ) and molar entropy (△ dis S ) were determined based on the Wilson model and the solubility data. Positive values of the dissolution enthalpy and entropy illustrated that the dissolution process of IBA in selected solvents are endothermic and entropy-driven.
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF CHEMICAL AND ENGINEERING DATA
·
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.
✓ 已验证
产品关联
DOI
高影响因子
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.
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Polymer Chemistry
·
2021
·Vol. 12
·期 33
·4812-4821
·
IF 5.582
Yudi Feng,Ke Jin,Jia Guo,Changchun Wang
The development of the modern microelectronic industry calls for low permittivity interlayer dielectric materials with excellent thermal stabilities, robust mechanical strength and matching processability. Traditionally, it is difficult to fabricate materials with low k values, high heat endurance, high modulus and good processability simultaneously. Herein, we prepared two novel hydrocarbon precursors with dibenzocyclooctene (DBCOD) and thermo-crosslinkable benzocyclobutene (BCB) units by group transformation and cross-coupling reactions. These precursors can be cured at elevated temperatures to give crosslinked all-aliphatic/aromatic-ring structures. The low-polarizable hydrocarbon skeletons possess low dielectric constants (Dk = 2.66/2.54, respectively) and superior hydrophobicity (high water contact angle of ∼113°/125° and low water uptake of 0.10%/0.37%). Moreover, the rigid crosslinked cyclic structures render significantly high thermostability and mechanical modulus, such as very high glass transition temperatures (Tg > 380 °C/369 °C), high 5% weight loss temperatures (Td,5% = 499 °C/492 °C), low coefficient of thermal expansion of 41.7/41.8 ppm K−1, and storage modulus of 3.7/3.8 GPa, respectively. The enhanced comprehensive performances make the all-carbocycle hydrocarbon resins good candidates for next-generation interlayer dielectrics.
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF CHEMICAL AND ENGINEERING DATA
·
2019
·
IF 2.298
Kui Wu,Yajun Li
The solid–liquid equilibrium data of o-toluenesulfonamide in 16 pure organic solvents, including methanol, ethanol, n-propanol, isopropanol, n-butanol, isobutanol, n-pentanol, isopentanol, acetone, ethyl acetate, acetonitrile, cyclohexanone, cyclopentanone, methyl acetate, ethyl formate, and dichloromethane, were measured by a static gravimetric method with the temperature ranging from 273.15 to 323.85 K under atmospheric pressure. The results showed that the solubility of o-toluenesulfonamide increased with the increasing temperature in all the solvents studied. The experimental solubility data were correlated by the modified Apelblat equation, λh equation, nonrandom two-liquid (NRTL) equation, and Wilson equation. All the models could be well employed, and the NRTL model gave the best fitting results.
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF HAZARDOUS MATERIALS
·
2019
·
IF 7.65
Naien Zhang,Jie Zhang,Hong Yan,Xiaorong Guo,Qiang Sun,Ruijie Guo
To overcome the flammability and severe dripping of polypropylene (PP), a novel organic-inorganic hybrid K-HBPE@APP (microencapsulated APP by a hyperbranched polyester (HBPE) via silane coupling agent (KH-550)) was obtained and used as a high-efficient flame retardant and smoke suppressant. Herein, HBPE acted as the charring agent for APP. 20 wt% of K-HBPE@APP imparted PP excellent flame retardancy, V-0 rating (UL-94 test) and 82.6% decrease in the peak of heat release rate (PHRR). However, PP with 25 wt% of mechanically mixed APP and HBPE achieved V-1 rating (UL-94 test) and 77.3% decrease in PHRR. That is because the direct contact and sufficient interaction between APP and HBPE gives full play to their synergy. Besides, K-HBPE@APP accelerated the formation of cross-linked P O C/Si O Si/ Si O C/Si O P/P O Φ structures, leading to a strong and compact char layer with a result of dramatic reduction in heat release rate and smoke production. Furthermore, K-HBPE@APP was highly water-resistant and has good compatibility with PP matrix. In particular, the flame-retarded PP had similar tensile strength to pure PP and enhanced impact strength.
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Energy Storage Materials
·
2019
·
IF 0
Jing Tian,Xuejun Zhou,Qingping Wu,Chilin Li
Mg-based batteries modulated by Li-salt additive can bypass the sluggish Mg solid diffusion at cathode side by kinetically better Li intercalation. However for this dual-salt system the highly electroactive cathodes endowed with high intrinsic conductivity and multi-electron transfer are still lacking, especially under large-sized grains and their high loading. Here a rhodizonate organic salt pre-pillared by K-ions (K 2 C 6 O 6 ) is proposed as high-rate cathode for Li-salt mediated Mg batteries. Under a high loading of 70 wt%, well-crystallized K 2 C 6 O 6 composed of ultra-large micro-sized grains (up to 30 μm) shows a reversible capacity more than 300 mA h/g at 0.1 C (based on three electron transfer), and up to 200, 130 and 60 mA h/g at 2 C, 5 C and 10 C respectively. The high bulk electron/ion conductivity and low solubility are responsible for such a superior performance based on fast Li-K electrochemical exchange and highly reversible Li intercalation without the assistance of nano-sizing, as a consequence of optimization and stabilization of desired electron structure and open framework by K-ion pre-supporting (instead of Li/Na-pillaring) and Mg-ion trapping between C 6 O 6 2- layers. These large monoliths of K 2 C 6 O 6 do not undergo serious grain fracture after long-term cycling, and at that time the Mg anode still remains compact and dendrite-free.
✓ 已验证
产品关联
DOI
ACS Applied Materials & Interfaces
·
2019
·
IF 8.456
Shanshan Yang,Yuanwei Liu,Junbin Liao,Huawen Liu,Yuliang Jiang,Bart Van der Bruggen,Jiangnan Shen,Congjie Gao
Surface modification has been proven to be an effective approach for ion exchange membranes to achieve separation of counterions with different valences by altering interfacial construction of membranes to improve ion transfer performance. In this work, we have fabricated a series of novel cation exchange membranes (CEMs) by modifying sulfonated polysulfone (SPSF) membranes via codeposition of mussel-inspired dopamine (DA) and 4′-aminobenzo-15-crown-5 (ACE), followed by glutaraldehyde cross-linking, aiming at achieving selective separation of specific cations. The as-prepared membranes before and after modification were systematically characterized in terms of their structural, physicochemical, electrochemical, and electrodialytic properties. In the electrodialysis process, the modified membranes exhibit distinct perm selectivity to K+ ions in binary (K+/Li+, K+/Na+, K+/Mg2+) and ternary (K+/Li+/Mg2+) systems. In particular, at a constant current density of 5.0 mA·cm–2, modified membrane M-co-0.50 shows significantly prominent perm selectivity in the K+/Mg2+ system and M-co-0.75 exhibits remarkable performance in the K+/Li+ system , superior to commercial monovalent-selective CEM (CIMS, , ). Besides, in the K+/Li+/Mg2+ ternary system, K+ flux reaches 30.8 nmol·cm–2·s–1 for M-co-0.50, while it reaches 25.8 nmol·cm–2·s–1 for CIMS. It possibly arises from the effects of pore-size sieving and the synergistic action of electric field driving and host–guest molecular recognition of ACE and K+ ions. This study can provide new insights into the separation of specific alkali metal ions, especially on reducing influence of coexisting cations K+ and Na+ on Li+ ion recovery from salt lake and seawater.
✓ 已验证
产品关联
DOI
PubMed
高影响因子
危险品化学品经营许可证（带存储）