APPLIED SURFACE SCIENCE
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2023
·
IF 6.7
Xiaokun Zhu,Shuaizhao Jin,Xiaohan Yu,Zhiyuan Yu,Xin Gu,Xiaoli Guan,Kaikai Wu,Yixin Yan,Liming Zhao,Jiamei Han,Jiabin Jiang,Xiang Liu,Xiangming Li
In this study, La 0.7 Ag 0.3- x K x MnO 3 (LAKMO, x = 0.15, 0.16, 0.17, 0.18, and 0.19) films with excellent electrical properties and low surface roughness were prepared on SrTiO 3 ( 0 0 1 ) substrates using the spin-coating method. The crystal structures and ion valence states of the LAKMO films were modified by adjusting the doping amounts of Ag and K. The Jahn–Teller effect and electron–lattice coupling were enhanced with the MnO 6 octahedron undergoes distortion. Moreover, the double-exchange interaction was improved with an increase in the number of Mn 4+ /Mn 3+ ion pairs. Under the influence of these factors, the electrical transport properties especially the temperature coefficient of resistivity ( TCR ) of the LAKMO films can be refined modulated or optimized via A-site Ag and K co-doping. When x = 0.17, the maximum TCR of LAKMO reached 11.23 % K −1 at 293.23 K. Thus, La 0.7 Ag 0.13 K 0.17 MnO 3 film with a large TCR exhibited excellent thermal properties at room temperature and was considered material for application to uncooled infrared bolometers.
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JOURNAL OF CHEMICAL AND ENGINEERING DATA
·
2018
·
IF 2.196
Behnaz Asadzadeh,Jialun Zhong,Weidong Yan
Solid–liquid equilibrium data of rebaudioside A (a natural sweetener) in nine pure solvents (methanol, ethanol, 1-propanol, 2-propanol, acetonitrile, 2-methoxyethanol, 2-ethoxyethanol, 2-buthoxyethanol, and ethylene glycol) and two binary mixed solvents (methanol + ethanol and 2-methoxyethanol + ethanol) were been measured by high performance liquid chromatography at temperatures ranging from (288.15 to 328.15) K and atmospheric pressure. From the experimental data, it was found that the solubility increased with the rising temperature in all studied solvents. The obtained values for the solubility of rebaudioside A in pure and mixed binary solvents were correlated with modified Apelblat and nonrandom two-liquid models. The results showed that these models can accurately correlate the solubility data obtained in this work. Furthermore, the crystal habits of rebaudioside A in selected solvents were studied.
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Catalysts
·
2019
·Vol. 9
·期 3
·218
·
IF 3.444
Shaoxia Guo,Guilong Liu,Tong Han,Ziyang Zhang,Yuan Liu
Owing to the outstanding catalytic performance for higher alcohol synthesis, Ga-Co catalysts have attracted much attention. In view of their unsatisfactory stability and alcohol selectivity, herein, K-modulated Co nanoparticles trapped in La-Ga-O catalysts were prepared by the reduction of La1−xKxCo0.65Ga0.35O3perovskite precursor. Benefiting from the atomic dispersion of all the elements in the precursor, during the reduction of La1−xKxCo0.65Ga0.35O3, Co nanoparticles could be confined into the K-modified La-Ga-O composite oxides, and the confinement of La-Ga-O could improve the anti-sintering performance of Co nanoparticles. In addition, the addition of K modulated parts of La-Ga-O into La2O3, which ameliorated the anti-carbon deposition performance. Finally, the addition of K increased the dispersion of cobalt and provided more electron donors to metallic Co, resulting in a high activity and superior selectivity to higher alcohols. Benefiting from the above characteristics, the catalyst possesses excellent activity, good selectivity, and superior stability.Keywords:perovskite-type oxide (PTO);cobalt;gallium;potassium;higher alcohols;syngas
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JOURNAL OF CHEMICAL AND ENGINEERING DATA
·
2018
·
IF 2.196
Lijiang Guo,Lanying Tu,Yaxiao Wang,Jianqiang Li
Water activities in the ternary system CsCl–MgCl2–H2O and its sub-binary systems at 323.15 K were elaborately measured by an isopiestic method. Moreover, the solubility of the CsCl–MgCl2–H2O system at 323.15 K was also measured by the flow-cloud-point method. A Pitzer model was used to predict the measured water activity and solubility data. The binary parameters for the CsCl–H2O system at 323.15 K were obtained by fitting the measured water activities for this binary system. The calculated water activity and solubility isotherms for the CsCl–MgCl2–H2O system at 323.15 K, with binary parameters only, deviated from the experimental values. This means that it is insufficient with binary parameters only to predict the water activity and calculate the solubility isotherms of the CsCl–MgCl2–H2O system at 323.15 K. The calculated solubility isotherms with both binary and mixing parameters, obtained by fitting the measured water activity, also deviated from experimental values. A new set of reasonable ternary parameters for the CsCl–MgCl2–H2O system was obtained by fitting the measured water activity and solubility data of this work. The calculated solubility isotherms with these parameters agreed with experimental results.
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Energy Technology
·
2018
·Vol. 6
·期 12
·2358-2366
·
IF 3.175
Junkai Zhao,Zhixing Wang,Jiexi Wang,Huajun Guo,Xinhai Li,Weihua Gui,Ning Chen,Guochun Yan
The rapid rise of electrode impedance and capacity decay of Ni-rich layered cathode materials during high-voltage cycling are rooted in their severe structural degradation. Here we present a feasible strategy, anchoring ∼1 % K + into the Li + sites of LiNi 0.8 Co 0.15 Al 0.05 O 2 as an excellent structural stabilizer, to overcome aforementioned issues, and the similarities and differences in terms of modification mechanism is compared with Na + . Showing difference with Na + that tends to migrate into electrolyte during high-voltage cycling, K + occupies in Li + site firmly because of its larger ionic radius and lower migrating ability, which sustainably prevent the irreversible phase transition between two hexagonal phases (H2 and H3) and impede the cation migration in highly delithiated state, thus suppressing the structural degradation. Benefiting from these merits, Li 0.99 K 0.01 Ni 0.8 Co 0.15 Al 0.05 O 2 delivers a large initial discharge capacity of 217 mAh g −1 at 0.1 C and maintains stable cycling at 1 C in a high voltage of 4.6 V (remaining 87.4 % of its initial capacity after 150 cycles). The mechanism proposed in this work, accounting for enhanced structural stability under high-voltage cycling by K + anchoring in Ni-rich cathode materials, provides a vital hint for rational designing advanced cathode materials to pursue high energy density Li-ion batteries.
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JOURNAL OF CHEMICAL AND ENGINEERING DATA
·
2018
·
IF 2.196
Shuyu Ning,Weifeng Chen,Teng Pan,Youwei Cheng,Lijun Wang,Xi Li
Solubilities of isophthalic acid in ternary mixtures of acetic acid + water + benzoic acid were determined by the static analytical method. The temperature range was from 292.55 to 372.10 K, the mass ratios of water to acetic acid were 0, 1:9, and 1:4, and the mass fractions of benzoic acid in initial solvent ranged from 0 to 20.1%. The experimental results indicated that the solubility of isophthalic acid increased with the introduction of benzoic acid to the binary solvents of acetic acid and water, and that could be explained by Hansen’s three-dimensional parameters and like-dissolves-like rule. Then the experimental solubilities were correlated by the nonrandom two liquids (NRTL) model, and the model parameters were regressed. The values calculated by the NRTL model showed good agreement with the experiment data.
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JOURNAL OF CHEMICAL AND ENGINEERING DATA
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2018
·
IF 2.196
Yongzhao Zhang,Xia Guo,Ping Tang,Jian Xu
2,5-Furandicarboxylic acid (FDCA) serves as a monomer in various polyesters and is often obtained through the oxidation of 5-hydroxymethylfurfural. The solubility data of FDCA are of great value for the reaction process analysis and separation technology. The experimental solubility of FDCA in eight pure solvents (water, methanol, acetonitrile, acetic acid, ethyl acetate, methyl isobutyl ketone (MIBK), 1-butanol, and isobutanol) and two binary solvent systems (water + acetonitrile and water + acetic acid) in the temperature range of 313.15–363.15 K was determined. In pure solvents and binary mixtures, the solubility of FDCA increased with the increasing temperature. The order from largest to smallest solubility in pure solvents was as follows: methanol, 1-butanol, isobutanol, acetic acid, water, MIBK, ethyl acetate, and acetonitrile. The mole fraction of FDCA in binary mixtures increased first and then decreased with the increasing mole fraction of water. The solubility data were correlated with the UNIQUAC model, NRTL model, and WILSON model.
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JOURNAL OF CHEMICAL AND ENGINEERING DATA
·
2019
·
IF 2.298
Yajun Li,Kui Wu,Lei Liang
Benzenesulfonamide (BSA) is known as an important chemical material and intermediate in chemical industry. Information concerning solid–liquid equilibrium of BSA in different solvents is essential for the development of its separation and reaction process. In this work, the equilibrium solubility of BSA in 16 neat solvents, namely, methanol, ethanol, n-propanol, isopropanol, n-butanol, isobutanol, n-pentanol, isopentanol, acetone, ethyl acetate, acetonitrile, cyclohexanone, cyclopentanone, methyl acetate, ethyl formate, and dichloromethane was determined by a static gravimetric method within the temperature range of 273.15–324.45 K under atmospheric pressure. The solubility of BSA increases with the rising temperature in all selected solvents. The obtained solubility was mathematically represented by using the Apelblat model, λh equation, nonrandom two-liquid (NRTL) equation, and the Wilson equation in order to correlate the experimental data with the adjustable parameters. The dissolution properties of BSA, including Gibbs energy (ΔdisG), molar enthalpy (ΔdisH), and molar entropy (ΔdisS) were determined according to the Wilson model and the solubility data. Positive values of the dissolution enthalpy and entropy illustrated that the dissolution processes of BSA in these solvents are endothermic and entropy-driven.
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Frontiers in Energy Research
·
2023
·
IF 3.4
Huang Jiamin,Zhang Guanghui,Wang Mingrui,Zhu Jie,Ding Fanshu,Song Chunshan,Guo Xinwen
The catalytic production of higher alcohols (HAs) is a promising path for converting CO2 into value-added chemical products. The application is still limited by the low selectivity of HAs (less than 10%) on most catalysts. Here, we report a tandem catalyst consisting of Mn-Cu-K modified iron carbide and CuZnAlZr catalyst. The modification of iron carbide with Mn, Cu and K promoters improves the formation of HAs (13.5% Sel.), and the construction of tandem catalysts with CuZnAlZr can further enhance the catalytic performance. By examining different catalyst filling methods and the filling ratio of the tandem catalyst, it was found that the powder mixing resulted in a higher selectivity of HAs with a mass ratio of the two components of 1:1, and a synergistic effect leads to a higher selectivity of HAs (15.5%) with about 40% of propanol and butanol among HAs.
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Sustainable Energy & Fuels
·
2022
·Vol. 6
·期 4
·1108-1120
·
IF 6.813
Wenrui Wei,Haoran Lv,Xuehui Wang,Wenzhe Zhang,Zining Sun,Jing Shi,Minghua Huang,Shuai Liu,Zhicheng Shi,Huanlei Wang
Expanding the graphitic interlayer spacing and introducing heteroatoms into the carbon structure are the two key strategies for boosting the potassium storage performance. To fundamentally clarify the relation of graphitic structures and heteroatom-doping in carbon with the potassium storage behavior, carbons with diverse heteroatom-doping levels and microstructures (N,S-CNSs) are produced. It has been recognized that the potassium storage mechanism in N,S-CNSs can be described as an “adsorption–insertion” mechanism: the highly disordered/pseudo-graphitic carbon structure with rich defective sites contributing to a high-potential sloping region by “adsorption” and the graphitic carbon structure contributing to a low-potential plateau region by “insertion”. By tuning the “adsorption” and “insertion” mechanisms, N,S-CNS-1200 with a highly developed graphitic structure can provide a satisfactory reversible specific capacity of ∼300 mA h g−1 at 0.05 A g−1 with a high initial coulombic efficiency of 44.9%, a high “insertion” capacity contribution of 57.9%, and a high capacity retention ratio of 81.9% after 1000 cycles. Moreover, kinetic analysis and ex situ XRD studies show that the kinetic diffusion of K+ in N,S-CNS-1200 is more advantageous. This work clearly clarifies the pivotal role of tuning the heteroatom doping and graphitic structure of carbons for realizing highly accessible graphitic structures for advanced potassium ion batteries.
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Polymers
·
2022
·Vol. 14
·期 3
·406
·
IF 4.967
Xiao Wang,Xianghong Zheng,Xinyu Liu,Birong Zeng,Yiting Xu,Conghui Yuan,Lizong Dai
Due to unique chelating and macrocyclic effects, crown ether compounds exhibit wide application prospects. They could be introduced into amphiphilic copolymers to provide new trigger mode for drug delivery. In this work, new amphiphilic random polymers of poly(lipoic acid-methacrylate-co-poly(ethylene glycol) methyl ether methacrylate-co-N-isopropylacrylamide-co-benzo-18-crown-6-methacrylamide (abbrev. PLENB) containing a crown ether ring and disulphide bond were synthesized via RAFT polymerization. Using the solvent evaporation method, the PLENB micelles were formed and then used to load substances, such as doxorubicin hydrochloride (DOX) and gold nanoparticles. The results showed that PLENB exhibited a variety of lowest critical solution temperature (LCST) in response to the presence of different ions, such as K+, Na+and Mg2+. In particular, the addition of 150 mM K+increased the LCST of PLENB from 31 to 37 °C and induced the release of DOX from the PLENB@DOX assemblies with a release rate of 99.84% within 12 h under 37 °C. However, Na+and Mg2+ions could not initiate the same response. Furthermore, K+ions drove the disassembly of gold aggregates from the PLENB-SH@Au assemblies to achieve the transport of Au NPs, which is helpful to construct a K+-triggered carrier system.Keywords:crown ether;amphiphilic copolymers;K+-triggered;Au NPs;disassembly
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PubMed
高影响因子
Advanced Materials Interfaces
·
2022
·Vol. 9
·期 12
·2101863
·
IF 6.389
Yuan Liu,Xiaokun Wen,Wenyu Lei,Li Yang,Pengzhen Zhang,Yuhui Zhang,Haixin Chang,Wenfeng Zhang
Besides the widely investigated potential as alternative to silicon in microelectronics, semiconducting 2D transition metal dichalcogenides (TMDs) also show appealing prospects in thin film transistors (TFTs)-based applications, while still suffer from insufficient demonstration. Herein, the authors systematically report high-performance and low-power chemical vapor deposition-grown polycrystalline molybdenum ditelluride (MoTe 2 ) TFTs with solution-processed ternary Hf 0.5 Zr 0.5 O 2 /HfAlO 2 high-k dielectric. Benefitting from the optimized high quality HfAlO 2 film synthesis and proper postannealing treatment, the constructed MoTe 2 TFTs exhibit a high mobility ≈27.24 cm 2 V −1 S −1 , a current on/off ratio ≈6.43 × 10 5 , threshold voltage ≈−3.27 V, and subthreshold swing (SS) value ≈152.4 mV dec −1 , respectively. Moreover, by supplementing another solution-processed layer of ferroelectric Hf 0.5 Zr 0.5 O 2 to form double layer of HfAlO 2 /Hf 0.5 Zr 0.5 O 2 dielectric, the device performance can be further improved with an ignorable hysteresis, increased mobility of ≈55.53 cm 2 V −1 S −1 , and significantly reduced SS value of ≈110.16 mV dec −1 , respectively. The current investigation offers a feasible strategy to fabricate high-performance and low-power MoTe 2 TFTs for potential TMDs-based TFTs applications.
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