Advanced Science
·
2023
·Vol. 10
·期 32
·2304067
·
IF 15.1
Lin-Rong Wu,Yu-Han Zhang,Zhen Wu,Jinlv Tian,Haorui Wang,Haijun Zhao,Shoudong Xu,Liang Chen,Xiaochuan Duan,Ding Zhang,Huijuan Guo,Ya You,Zhi Zhu
High-capacity O3-type layered sodium oxides are considered one of the most promising cathode materials for the next generation of Na-ion batteries (NIBs). However, these cathodes usually suffer from low high-rate capacity and poor cycling stability due to structure deformation, native air sensitivity, and interfacial side reactions. Herein, a multi-site substituted strategy is employed to enhance the stability of O3-type NaNi 0.5 Mn 0.5 O 2 . Simulations indicate that the Ti substitution decreases the charge density of Ni ions and improves the antioxidative capability of the material. In addition, the synergistic effect of K + and Ti 4+ significantly reduces the formation energy of Na + vacancy and delivers an ultra-low lattice strain during the repeated Na + extraction/insertion. In situ characterizations verify that the complicated phase transformation is mitigated during the charge/discharge process, resulting in greatly improved structure stability. The co-substituted cathode delivers a high-rate capacity of 97 mAh g −1 at 5 C and excellent capacity retention of 81% after 400 cycles at 0.5 C. The full cell paired with commercial hard carbon anode also exhibits high capacity and long cycling life. This dual-ion substitution strategy will provide a universal approach for the new rational design of high-capacity cathode materials for NIBs.
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高影响因子
JOURNAL OF MOLECULAR LIQUIDS
·
2020
·
IF 5.065
Shuai Yu,Xiaoxuan Xu,Wenguo Xing,Fumin Xue,Yan Cheng
The solubility of gliclazide in seventeen pure solvents, i.e. methanol, ethanol, n-propanol, i-propanol, n-butanol, i-butanol, s-butanol, acetone, cyclohexanone , ethyl formate , methyl acetate , ethyl acetate , acetonitrile , tetrahydrofuran , N , N -dimethylformamide, chloroform and toluene was determined using a gravimetric method over a temperature range from 278.15 to 318.15 K at atmospheric pressure. The obtained solubility was corrected by the modified Apelblat equation, λh equation, non-random two-liquid (NRTL) equation, and the Wilson equation. The mixing properties, such as the dissolution Gibbs energy , enthalpy and entropy of gliclazide, were calculated based on the Wilson equation. The solubility data, thermodynamic parameters and dissolution properties would be useful for the development and optimization of the crystallization processes for gliclazide in industry.
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JOURNAL OF ALLOYS AND COMPOUNDS
·
2021
·
IF 5.316
Jin Chen,Chun-Li Hu,Yi-Lin Li,Qian-Qian Chen,Bing-Xuan Li,Jiang-Gao Mao
Herein, we reported two alkali metal molybdenum(VI) iodates, namely, NaMoO 3 (IO 3 ) and γ-KMoO 3 (IO 3 ) with 1D and 3D [MoO 3 (IO 3 )] − anionic architectures, respectively. The novel 1D chain in NaMoO 3 (IO 3 ) and the 3D network in γ-KMoO 3 (IO 3 ) are constructed by the 0D Λ-shaped cis -[MoO 4 (IO 3 ) 2 ] 4− building units interconnected by bridging IO 3 − anions as well as the corner-sharing of oxo anions. Importantly, the polar γ-KMoO 3 (IO 3 ) exhibits a very large second-harmonic generation (SHG) effect of 12 × KH 2 PO 4 (KDP) under 1064 nm laser radiation, a high laser-Induced damage threshold value (52 × AgGaS 2 ), and a moderate birefringence of 0.087@1064 nm, whereas the centrosymmetric NaMoO 3 (IO 3 ) has a large birefringence of 0.208@1064 nm. This study further proves the useful route of exploring promising optical materials via assembling the 0D basic building units into higher dimensional anionic architectures.
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JOURNAL OF ALLOYS AND COMPOUNDS
·
2022
·
IF 6.371
Zhenlong Cheng,Mingzhou Meng,Xin Qiao,Yuanli Liu,Ute Resch-Genger,Jun Ou
Optical Thermometry is popular among researchers because of its non-contact, high sensitivity, and fast measurement properties. In the present experiment, Er 3+ /Yb 3+ /K + co-doped NaYF 4 nanoparticles with different K + concentrations were synthesized by solvothermal method , and the samples showed bright upconversion green emission under the excitation of a 980 nm laser. The powder X-ray diffractometer and transmission electron microscope were used to characterize the crystal structure and its surface morphology , respectively. The spectral characteristics of nanoparticles with K + doping concentration from 10% to 30% (Molar ratio) were investigated by fluorescence spectroscopy , and it was observed that the fluorescence intensity reached the maximum at the K + concentration of 20%, after which the intensity weakened when the K + content continued to increase. According to the dependence between the luminescence intensity of the sample and the laser power density and fluorescence lifetime , the intrinsic mechanism was carefully investigated. Temperature-dependent spectra of the samples were recorded in the temperature range of 315–495 K， and the maximum values of absolute sensitivity (S a ) and relative sensitivity (S r ) were measured at 0.0041 K −1 (455 K) and 0.9220%K −1 (315 K). The experimental results show that K + /Er 3+ /Yb 3+ triple-doped NaYF 4 green fluorescent nanoparticles (GFNs) have good prospects for applications in display devices, temperature sensing, and other fields.
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JOURNAL OF CHEMICAL THERMODYNAMICS
·
2020
·
IF 2.888
Lele Chen,Xiuxiu Yang,Yafei Guo,Tianlong Deng,Dan Li,Lingzong Meng
The solubility corresponding solution physicochemical properties (densities, refractive indices and pH) in the quaternary system (NaCl + NaBO 2 + Na 2 B 4 O 7 + H 2 O) were investigated at 298.15 K by the isothermal dissolution equilibrium method. The dry-salt phase diagram, water content diagram, refractive index diagram and pH diagram were drawn. There are four crystallization fields corresponding to NaCl, NaBO 2 ·4H 2 O, Na 2 B 4 O 7 ·10H 2 O, NaCl·NaBO 2 ·2H 2 O, five univariant curves and two invariant points in the phase diagram of the quaternary system. The solubility, concentrations of boron species B(OH) 3 , B(OH) 4 − , B 3 O 3 (OH) 4 − , B 4 O 5 (OH) 4 2− and OH − in the system were calculated using the Pitzer model. The variation trends for calculated solubility curves and pH curves are consistent with the experimental results. The distributions of different boron species were obtained in the mixed borate solution. The distributions of four boron species were obtained in the mixed borate solution. The main boron species in the mixed borate solution are B(OH) 4 − and B 4 O 5 (OH) 4 2− . The mole fractions of the four boron species are mainly affected by m (B) in the solution but less by m (Cl − ).
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JOURNAL OF CHEMICAL AND ENGINEERING DATA
·
2021
·
IF 2.694
Shaonan Zhang,Ningning Tian,Shengzhe Jia,Jing Yang,Yu Zhou,Shichao Du,Zhenguo Gao
The solubility of pentaerythritol (PE) in four binary solvents (methanol + water, ethanol + water, isopropanol + water, acetonitrile + water) is determined using the gravimetric method at temperatures ranging from 283.15 to 323.15 K under 0.1 MPa. The experimental results demonstrate that the solubility of PE increases with the increase of temperature in all four binary solvent systems. And water has a relatively positive effect on the solubility of PE in all four binary solvents. However, the solubility of PE in ethanol + water and isopropanol + water mixtures first increases with the increase of the ethanol/isopropanol fraction and then decreases when the temperature exceeds 303.15 and 288.15 K, respectively. And the solubility reaches the maximum when the initial mole fractions of ethanol/isopropanol of the binary solvent are 0.2. Besides, experimental solubility is fitted with three thermodynamic models including the modified Apelblat model, λh model, and CNIBS/R-K model, and all of the average relative deviation (ARDs) are less than 4%, indicating good accordance with the experimental results. In addition, among the three thermodynamic models, the CNIBS/R-K model has the best fitting performance, in which all of the ARDs are less than 1.7%.
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JOURNAL OF CHEMICAL AND ENGINEERING DATA
·
2020
·
IF 2.369
Ningning Tian,Changyou Yu,Shichao Du,Bo Lin,Ye Gao,Zhenguo Gao
The solid–liquid equilibrium solubility of isatoic anhydride in 12 pure solvents (methanol, ethanol, 1-propanol, isopropyl alcohol, methyl acetate, ethyl acetate, propyl acetate, isopropyl acetate, acetone, 2-butanone, acetonitrile, and 1,4-dioxane) at T = 288.15 to 328.15 K was measured by the gravimetric method under atmospheric pressure. Experimental results demonstrate that the mole fraction solubility of isatoic anhydride in these selected solvents increased with the increase of temperature, and the dissolution behavior is affected by multiple factors like polarity, H-bond interaction, cohesive energy density, etc. The modified Apelblat model, the van’t Hoff model, the nonrandom two-liquid model, and the λh model were used to correlate the experimental solubility data. The maximum values of the relative average deviation and root-mean-square deviation were no more than 4.23 × 10–2 and 5.31 × 10–4, respectively. Furthermore, the thermodynamic properties including the mixing Gibbs energy, mixing enthalpy, and mixing entropy were calculated, which indicates that the dissolution of isatoic anhydride was a spontaneous and entropy-favorable process.
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JOURNAL OF CHEMICAL AND ENGINEERING DATA
·
2025
·
IF 2.1
Wenfeng Huang,Yufeng Wei,Xiaocong Liu,Ruonan Li,Qiuxiang Yin,Lihong Jia
The equilibrium solubility of quetiapine fumarate was determined in twelve individual solvents and one binary solvent mixture by the gravimetric method at atmospheric pressure over a temperature range of 283.15–323.15 K. The results showed that the solubility increases with increasing temperature in all selected solvents. The solubility order is tetrahydrofuran–water (mole fraction of tetrahydrofuran 0.8083) > tetrahydrofuran > n-propanol > dichloromethane > butanone > methyl isobutyl ketone > xylenes > ethyl formate > tert-butyl methyl ether > isopropyl acetate > toluene > hexane ≈ heptane. The modified Apelblat model, λh model, nonrandom two-liquid model, and van’t Hoff–Jouyban–Acree model were employed to correlate the experimental solubility. The four models provided satisfactory fits, as confirmed by the average relative deviation and the root-mean-square deviation. The modified Apelblat model showed the best performance among them. The accurate solubility data are essential for the design and optimization of the crystallization process of QF.
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产品关联
DOI
高影响因子
COMPOSITES PART B-ENGINEERING
·
2025
·
IF 14.2
Xinhui Geng,Ping Hu,Yanchun Zhou,Xiaoguang Luo,Haitao Han,Fei Wang,Anqi Li,Chengfan Yuan,Wuju Wang,Xinghong Zhang
Ultra-high temperature thermal protection materials play key roles for protecting hypersonic flight, re-entry vehicles, and propulsion systems from thermal attack. However, even the top-level passive protection materials such as C f /HfB 2 -SiC composites are unable to withstand the long-term harsh-environment above 3100 K as they suffer severe ablations. To overcome this bottleneck, herein a synergistic active-passive strategy is proposed. Embed aligned cooling channels were fabricated via microelectrical discharge machining (Micro-EDM) in C f /HfB 2 -SiC composite and liquid water was used as the cooling medium, forming an integrated system combining the composite’s passive ablation resistance and the channels’ active temperature regulation capability. Benefiting from this novel strategy, the surface temperature was significantly reduced by 46% (from over 3100 K to below 1700 K). Furthermore, a qualitative leap in ablation resistance was achieved, e.g., the ablation rate was dropped from 5.12×10 -3 mm/s to a non-ablation state after 400 s at such a high temperature, with almost no surface oxidation. These achievements were believed to stem from the synergistic coupling of the “passive barrier” (high melting point, good ablation resistance) and the liquid water’s “active reinforcement” (enhanced surface heat transfer). Notably, for 0.4 mm-diameter channels, heat and mass transfer were optimized, blockages and pressure fluctuations were mitigated, ensuring the cooling stability. This work demonstrates that the 3100 K ablation resistance limit of thermal protection materials can be broken, providing a promising route for developing materials suitable for service at temperatures above 3100 K, and lays a solid foundation for upgrading thermal protection in next-generation propulsion systems.
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Journal of Materials Chemistry A
·
2016
·Vol. 4
·期 43
·17104-17110
·
IF 8.262
Wenzhe Li,Jiangwei Li,Jiaoli Li,Jiandong Fan,Yaohua Mai,Liduo Wang
The poor stability of hybrid organic–inorganic perovskite is one of crucial problems limiting the practical application of the perovskite solar cells (PSCs). All-inorganic lead-free perovskite materials, with Cs replacing the organic cations and Sn replacing Pb, have shown great potential in achieving high thermal stability. However, tin-based perovskites have inevitably suffered from severe bulk recombination, attributed to Sn vacancies. In this work, we obtain CsSnIBr2 thin films with low Sn vacancy assisted by the addition of hypophosphorous acid (HPA). The HPA additive here as complexant is demonstrated to be capable of speeding up the nucleation process while inhibiting the formation of Sn4+ during the formation process of CsSnIBr2 thin films. With a mesoscopic architecture, the CsSnIBr2 PSCs exhibit efficiency-loss free in 77 days and remarkably stable power output within 9 hours at high temperatures up to 473 K.
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Journal of Chemistry
·
2021
·Vol. 2021
·期 1
·4541213
·
IF 2.506
Zhenzhen Jiang,Chi Ma,Gaoling Liu,Kangrui Sun,Mingli Li,Yafei Guo,Lingzong Meng,Tianlong Deng
To effectively develop the rare earth elements resources from the geothermal waters, it is essential to understand the volumetric properties of the aqueous solution system to establish the relative thermodynamic model. In this study, densities of YCl 3 (aq) at the molalities of 0.08837–1.60639 mol·kg −1 from 283.15 K to 363.15 K at 5 K intervals and ambient pressure were measured experimentally by an Anton Paar digital vibrating-tube densimeter. Based on experimental data, the volumetric properties including apparent molar volume ( V ϕ ) and the coefficient of thermal expansion of the solution ( α ) of the binary systems (YCl 3 + H 2 O) were derived. The 3D diagram ( m i , T , V ϕ ) of apparent molar volumes against temperature and molality was plotted. On the basis of the Pitzer ion-interaction model of electrolyte, the Pitzer single-salt parameters ( , , and ) for YCl 3 and temperature-dependence equation F ( i , p , T ) = a 1 + a 2 ln(T/298.15) + a 3 (T-298.15) + a 4 /(620-T) + a 5 (T-227) as well as their coefficients a i ( i = 1–5) in the binary system were obtained for the first time. The values of Pitzer single-salt parameters of YCl 3 agree well with the calculated values corresponding to the temperature-dependence equations, indicating that single-salt parameters and temperature-dependent formula obtained in this work are reliable.
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Journal of Materials Chemistry C
·
2017
·Vol. 5
·期 37
·9545-9551
·
IF 5.256
Jian-Min Li,Jie Fang
An anthracene vapor-assisted inverse transport growth mechanism of unsupported ultrathin two-dimensional (2D) superconducting single-crystal niobium (Nb) and niobium diselenide (NbSe2) nanoplates (thickness ∼2.5 nm) using anthracene and NbSe2 powders as precursors is reported. Besides the whisker-like counterparts, the anthracene vapor hierarchical invasion into NbSe2 leads to 2D Nb nanoplates with a {110} surface and 2D few-layered {0001} NbSe2 nanoplates grown in the high-temperature residual region, while sub-millimeter selenium whiskers are found in the low-temperature transporting region. Direct magnetization measurements demonstrated that superconductivity at ∼3.3 K was clearly observed in the unsupported ultrathin Nb and NbSe2 nanoplates. These findings may offer a new way to produce freestanding single-crystal 2D superconductors and elemental 2D metallic nanoplates.
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