JOURNAL OF ALLOYS AND COMPOUNDS
·
2021
·
IF 5.316
Jiajia Ye,Guang Xia,Xuting Li,Zhiqiang Zheng,Zhanghua Fu,Qingshuai Zhang,Cheng Hu
The Ni 2 P anode own high theoretical capacity but still suffer from big volume expansion thus resulting sluggish electrochemical kinetics in K-ion batteries. Herein, we design and synthesize the urchin-like Ni 2 P yolk-shell microspheres encapsulated into N-doped carbon shells (Ni 2 P@N-C) for the first time through one-step hydrothermal followed a phosphidation/carbonization process. The unique urchin-like morphology provides fast charge transfers to the active sites for improved K-ion storage at high current densities. The yolk-shell structure couples with the nitrogen-doping carbon layer to effectively relieve the volume expansions while enhancing the conductivity of the whole anode composite. As a result, Ni 2 P@N-C electrode delivers an ultrahigh capacity of 172.6 mAh g −1 at 2000 mA g −1 after long time of 3000 cycles and shows outstanding rate performance of 136.6 mAh g −1 at 5000 mA g −1 . Lastly, ex situ X-ray diffraction analysis of K + ion insertion/extraction into/from the Ni 2 P@N-C electrode shows that potassium ion storage mechanism was to be Ni 2 P + 3K + +3e - ↔K 3 P + 2Ni.
研究领域:
材料科学
·
电化学
·
能源存储
·
纳米材料
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电池技术
✓ 已验证
DOI
高影响因子
Science China-Chemistry
·
2014
·Vol. 57
·期 5
·662-668
·
IF 1.516
Chai YunFeng,Pan YuanJiang
Protonation and alkali-metal cation adduction are the most important ionization processes in soft-ionization mass spectrometry. Studies on the fragmentation mechanism of protonated and alkali-metal-cationized compounds in tandem mass spectrometry are essential and helpful for structural analysis. In some cases, it was often observed that a compound attached by different alkali-metal cations (or proton) exhibits similar fragmentation patterns but the relative abundances of product ions are different. This difference was considered to derive from the different electrostatic interactions of alkali-metal cations (or the bonded effect of proton) with the analyte. The alkali-metal cation with a smaller ionic radius shows stronger electrostatic interaction with the molecule because of its higher charge density. In addition, the bonded effect of the proton is stronger than the electrostatic interaction of the alkali-metal cation. In the present study, which used McLafferty-type rearrangements of even-electron ions ([M + Cat] + , Cat = H, Li, Na, K) as model reactions, the effect of cation size in mass spectrometric fragmentation reactions is highlighted. These considerations were also successfully applied to interpret the similar but distinct fragmentation behavior of proton and alkali-metal cation adducts of a synthetic compound (2-(acetamido(phenyl)methyl)-3-oxobutanoate) and a drug (entecavir).
研究领域:
分析化学
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质谱学
·
药物代谢
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分子结构解析
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有机质谱
·
电离机制
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DOI
高影响因子
Journal of Materials Chemistry A
·
2013
·Vol. 1
·期 16
·5031-5036
·
IF 0
Chu Liang,Yongfeng Liu,Mingxia Gao,Hongge Pan
In this paper, we report a KOH-doped Mg(NH2)2–2LiH system with low operating temperatures and good cycling stability. The Mg(NH2)2–2LiH–0.07KOH sample can reversibly desorb/absorb ∼4.92 wt% hydrogen with a starting and peak dehydrogenation temperature of ∼75 °C and ∼120 °C, respectively, the lowest in the current Mg(NH2)2–2LiH system studied. Moreover, the cycling stability of de-/hydrogenation is also remarkably improved by KOH doping as the average capacity degradation of the Mg(NH2)2–2LiH–0.07KOH system is of only 0.002 wt% per cycle within 30 cycles. Detailed structural investigations reveal that during ball milling, the doped KOH can react with Mg(NH2)2 and LiH to convert to MgO, KH and Li2K(NH2)3, which work together to provide the synergistic effects of thermodynamics and kinetics on hydrogen desorption and absorption of the Mg(NH2)2–2LiH system upon heating, consequently inducing a significant improvement in hydrogen storage properties.
研究领域:
材料科学
·
氢气储存
·
能源材料
·
固态化学
✓ 已验证
DOI
INORGANIC CHEMISTRY
·
2023
·
IF 4.6
Chao Dou,Shengqiang Liu,Fangyi Zhao,Zhen Song,Quanlin Liu
The discovery of violet-excitable blue-emitting phosphor is a significant breakthrough for the development of phosphor-converted full-spectrum white light-emitting diodes (WLEDs). However, the application of most known violet-excitable blue-emitting phosphors is limited by their low external quantum efficiency (EQE). In this work, we reported on how the EQE values of Eu2+-doped Ba(K)-β-Al2O3 blue-emitting phosphor can be significantly improved through lattice site engineering. By partially substituting K+ for Ba2+, the Eu2+-occupied crystallographic site changes and the coordination polyhedron of Eu2+ shrinks, leading to the increase of crystal field splitting. Consequently, the excitation spectrum exhibits a continuous red shift to match the violet excitation, which enhances the PL intensity of solid solution phosphor (Ba0.4K1.6)0.84Al22O35−α:0.32Eu2+ ((B0.4K1.6)0.84AO:Eu) by 1.42 times compared to that of the end-member Ba1.68Al22O35−α:0.32Eu2+ (B1.68AO:Eu) phosphor. Correspondingly, under the 400 nm violet light excitation, the EQE of optimal blue-emitting (B0.4K1.6)0.84AO:Eu phosphor is up to 53%. Additionally, the phosphor also shows excellent resistance to luminescence thermal quenching (95% at 150 °C). Finally, the WLED fabricated based on (B0.4K1.6)0.84AO:Eu and commercial green and red phosphors exhibited an ultra-high color rending index with Ra = 95.5 and R1–R15 >90. This work offers guidance for tuning the spectral properties of phosphors through lattice site engineering.
研究领域:
材料科学
·
光子学
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固态照明
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发光材料
·
光电子学
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DOI
高影响因子
JOURNAL OF THERMAL ANALYSIS AND CALORIMETRY
·
2022
·Vol. 147
·期 17
·9725-9735
·
IF 4.755
Huang Zhen,Gao Na,Liu Ming,Lin Yan,Chang Guozhang,Deng Lisheng,Huang Hongyu
This study uses K-modified copper slag as an oxygen carrier (OC) candidate to examine the characteristics of Chemical Looping Gasification (CLG) of high nitrogen wood waste (HNWW) and investigated the emissions of nitrogenous pollutants (NH 3 /HCN). K modification significantly improves the reactivity of original copper slag because some new species were generated. The calcined copper slag loaded with 10 mass% K (10 K-CS) has relatively higher performance, thus, it was selected as an OC in the CLG of HNWW. The presence of 10 K-CS significantly promotes the conversion of HNWW, especially the char conversion. A suitable HNWW to 10 K-CS mass ratio was determined as 3:7. The OC not only promotes the release of nitrogen (N) in HNWW and oxidizes the reducing nitrogenous-pollutants, thus, the generated NH 3 and HCN content decrease significantly. Compared with HNWW pyrolysis, the NH 3 and HCN content decrease by 78.86% and 46.20%, respectively, at the mass ratio of HNWW to 10 K-CS of 1:10. High temperature promotes the non-gas-phase nitrogen in char/tar to be converted into the nitrogenous pollutants. A long residence time facilitates the oxidization of nitrogenous pollutants. The introduction of steam promotes the release of nitrogenous pollutants, especially NH 3 .
研究领域:
能源工程
·
环境科学
·
化学工程
·
废物资源化技术
✓ 已验证
DOI
高影响因子
CERAMICS INTERNATIONAL
·
2024
·
IF 5.1
Zimeng Pan,Jiachen Wang,Zihao Chen,Zhenyu Wang,Yao Wang,Xiaolu Liang,Haitao Wang,Yiliang Liu,Yufei Du,Jiamei Han,Jiabin Jiang,Xin Gu,Xiang Liu
For uncooled infrared bolometers, the traditional thermal sensing materials such as vanadium oxide and amorphous silicon have a relative low value of temperature coefficient of resistivity ( TCR ). In contrast, perovskite manganese oxide films exhibit 3–5 times higher TCR values than traditional materials. The important challenge is to achieve both high TCR and peak TCR temperatures ( T k ) at room temperature. Herein, La 0.7 Ca 0.3− x K x MnO 3 (LCKMO, 0.22 ≤ x ≤ 0.28) films were fabricated on La 0.3 Sr 0.7 Al 0.65 Ta 0.35 O 3 (00 l ) substrates using a combined sol–gel and spin coating process. It was found that by optimizing the K doping amount at x = 0.24, on the one hand, double exchange mechanism becomes the strongest. On the other hand, with minimal lattice strain, electron scattering is inhibited, and the electron-lattice coupling effect improves. Furthermore, the film exhibits a dense surface structure and a uniform distribution of grains. Finally, TCR value reaches 15.95 % K −1 at the corresponding temperature of 283.28 K. Obviously, the prepared LCKMO films effectively combine the high TCR of La 1− x Ca x MnO 3 with the high T k of La 1− x K x MnO 3 by optimizing the K doping level. The results show that LCKMO films are a promising candidate for fabricating uncooled infrared bolometers.
研究领域:
材料科学
·
凝聚态物理
·
电子器件
·
薄膜技术
·
红外传感
✓ 已验证
DOI
高影响因子
JOURNAL OF CHEMICAL AND ENGINEERING DATA
·
2021
·
IF 2.694
Tiantian Tao,Yumin Liu,Jiayin Zhang,Yu Zhou,Yanbo Liu,Zhenguo Gao
Experimental solubility data of dibenzoylmethane (DBM) in three pure solvents (ethyl acetate, acetonitrile, methylbenzene) and three binary solvents (methanol + water, ethanol + water, and isopropyl alcohol + water) were measured by the gravimetric method from 278.15 to 318.15 K under atmospheric pressure. The experimental results showed that the solubility of DBM increased with the increase of temperature. Moreover, the solubility of DBM was temperature-dependent when the type and composition of solvents remained unchanged. The solubility of DBM decreased with the increase of solvent polarity because the molecular structure of DBM was not conducive to the formation of hydrogen bonds between solute and solvent molecules. The solubilities of DBM were correlated by the modified Apelblat equation, the van’t Hoff equation, the λh equation, and the NRTL equation. The modified Apelblat model produced the best fitting results among these models.
研究领域:
物理化学
·
热力学
✓ 已验证
DOI
高影响因子
JOURNAL OF CHEMICAL AND ENGINEERING DATA
·
2022
·
IF 3.119
Guo-Liang Nie,Rui-Zhi Cui,Wu Li
According to the composition characteristics of lithium, potassium, bromine, and other resources rich in the salt lake brine of the Qinghai–Tibet Plateau, the phase equilibria of the quaternary system LiBr-NaBr-KBr-H2O and its ternary subsystem LiBr-KBr-H2O at 323.15 K are studied by an isothermal dissolution equilibrium method. The solubility of each system in equilibrium solution at the corresponding temperature is measured, and the corresponding phase diagrams are drawn according to the phase equilibrium experimental data. The results show that there is no complex salt or solid solution in the ternary system LiBr-KBr-H2O at 323.15 K. The phase diagram contains one invariant point (E1), two univariate curves (AE1 and BE1), and two equilibrium solid crystallization regions (corresponding to LiBr·H2O and KBr), belonging to the simple cosaturated type. The quaternary system LiBr-NaBr-KBr-H2O also has no formation of complex salt and solid solution. The phase diagram contains two invariant points (F1 and F2), five univariate curves (E1F1, E3F1, F1F2, E2F2, and E4F2), and four equilibrium solid-phase crystallization regions (corresponding to LiBr·H2O, KBr, NaBr·2H2O, and NaBr). At the same time, to further explain the phase equilibrium relationship of each system at different temperatures and the change rule of each component, comparison and discussion are carried out.
研究领域:
化学工程
·
材料科学
✓ 已验证
DOI
高影响因子
JOURNAL OF CHEMICAL THERMODYNAMICS
·
2022
·
IF 3.269
Fei Yuan,Hua Li,Long Li,Shiqiang Wang,Yafei Guo,Tianlong Deng
In this study, densities of the two ternary aqueous solution systems (LiB 5 O 8 + LiCl + H 2 O) and (LiB 5 O 8 + Li 2 SO 4 + H 2 O) were measured using an accurate digital vibrating-tube densimeter from 283.15 to 363.15 K at an interval of 5 K and 101.325 kPa. B 5 O 8 - in aqueous solution was in the form of [B 5 O 6 (OH) 4 ] - . Therefore, the complex aqueous solution of LiB 5 O 8 is in the form of Li[B 5 O 6 (OH) 4 ]. Subsequently, the mean apparent molar volume ( V Φ θ ) and mixing ion-interaction parameters ( θ a , a ′ v and Ψ c , a , a ′ v , c = Li + , a = B 5 O 6 (OH) 4 - , a ′ = Cl - or SO 4 2- ) against temperature were obtained using the Pitzer equation for the first time. And then, the temperature-dependence equations for the Pitzer mixing ion-interaction parameters and the relevant temperature correlation coefficients of the equation a j, i.e. [ f ( a i , T ) = a 1 + a 2 ln( T /298.15) + a 3 ( T − 298.15) + a 4 /(620 − T ) + a 5 /( T − 227)] were also obtained through the least square fitting. These volumetric properties and parameterization Pitzer parameters obtained in this work could hopefully be used for the quantitatively predictive calculation of the physicochemical properties of the mixed electrolytes containing lithium, chloride, and sulfate ions at any temperature.
研究领域:
物理化学
·
热力学
·
溶液化学
✓ 已验证
DOI
高影响因子
JOURNAL OF CHEMICAL AND ENGINEERING DATA
·
2021
·
IF 2.694
Panxi Wu,Lifeng Zhang,Shujun Zhao,Chenchen Wang,Yongsheng Guo,Wenjun Fang
Biofuel may be an important component of aviation fuel for its significant advantages. In the present work, two biofuel samples, methyl laurate and pinane, are selected for blending research with n-dodecane, a typical model fuel of aviation kerosene. Densities and viscosities for the ternary system pinane (1) + n-dodecane (2) + methyl laurate (3) and corresponding binary systems have been measured at the temperatures from 293.15 to 333.15 K and atmospheric pressure. The excess molar volume (VmE) and viscosity deviation (Δη) of binary systems have been calculated based on experimental data and fitted to the Redlich–Kister equation, while those of the ternary system have been fitted to Nagata–Tamura, Redlich–Kister, Cibulka, and Singh semiempirical equations, respectively. The values of the excess molar volume are all positive for all investigated systems, while the viscosity deviations are all negative. The results are discussed from the perspective of intermolecular force and the structure. Furthermore, the densities and viscosities of both binary and ternary mixtures are satisfactorily correlated using the Jouyban–Acree model.
研究领域:
化学工程
·
物理化学
·
能源科学
✓ 已验证
DOI
高影响因子
Plant Nano Biology
·
2026
·
IF 9.1
Jiaqi Dong,Tiantian Yuan,Haiying Qiu,Jiayi Luo,Zeyu Jiang,Yong He,Zhujun Zhu,Guochao Yan
Soil salinization severely restricts plant growth and threatens food safety. Silicon nanoparticles (SiNPs) can alleviate salt stresses, while the mechanisms remain unclear. Aiming for targeted application of SiNPs under soil salinization, silicate (Si) was selected as reference Si source, and the effects of Si and SiNPs on plant growth, photosynthetic performance, antioxidant performance, and ionic homeostasis in cucumber under salt stress were comprehensively investigated with the usage of principal component analysis (PCA) and transcriptome sequencing. In general, salt stress induced significant growth inhibition in cucumber, with decreased biomass and root morphological parameters, while both Si and SiNPs alleviated growth inhibition in cucumber. In addition, Si and SiNPs application at high concentration more effectively enhanced Na/K homeostasis, and low concentration application of Si and SiNPs induced a more significant regulation on antioxidant enzyme activities. In addition, SiNPs induced a more extensive regulation on gene expression network than Si in response to salt stress in cucumber, which was supported by the results of enrichment analysis. Moreover, correlation analysis between key modules of weighted gene co-expression network analysis (WGCNA) and physiological traits implied that genes related to chloroplast functions, redox balance, and membrane transport processes could be the key targets of SiNPs. Overall, the results showed that Si and SiNPs promoted salt stress resistance in cucumber with a dose-dependent pattern. SiNPs application more effectively promoted cucumber biomass and regulated gene expression network than silicate under salt stress, while several key target genes of SiNPs in modulating salt stress in cucumber were also identified. The results would provide a basis of targeted application of SiNPs under soil salinization.
✓ 已验证
DOI
高影响因子
JOURNAL OF CHEMICAL AND ENGINEERING DATA
·
2026
·
IF 2.4
Zhao Lei,Yuhang Chen,Long Cheng,Maogang He,Ying Zhang
n-Dodecane is one of the key components of aviation kerosene. Although thermal conductivity data for n-dodecane is quite abundant, direct measurements of thermal diffusivity remain scarce, particularly in the vicinity of the aviation kerosene critical point. In this work, we measured the thermal diffusivity of n-dodecane using dynamic light scattering method in a temperature range of (290.15–633.15) K along seven isobars at p = (0.1, 1.0, 1.5, 1.8, 2.0 2.5 and 5.0) MPa and analyzed the thermal diffusivity as affected by temperature and pressure. The relative combined uncertainty of the thermal diffusivity experimental system is estimated to be 0.026 at a coverage factor of k = 2 with the level of confidence 0.95. The polynomial correlation of the thermal diffusivity against the temperature and pressure was proposed. The absolute average relative deviation and maximum relative deviation between the calculated results and experimental data are 0.68% and 2.98%, respectively. This study accurately measured the thermal diffusivity over a wide temperature range. It is expected to fill the gap in the existing literature and provide support for the exploration of the near-critical zone phenomenon.
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）