JOURNAL OF CHEMICAL AND ENGINEERING DATA
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2016
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IF 1.835
Hongjie Xu,Zuoxiang Zeng,Weilan Xue,Kun Li
The solubility of ethyl p-aminobenzoate (EPAB) was measured in six different alcohols (methanol, ethanol, n-propanol, n-butanol, isobutyl alcohol, isoamyl alcohol) within (283.15 to 327.15) K by the last solid disappearance method. The solubility increases with increasing temperature. The decreasing order satisfies the following sequence: methanol > ethanol > n-propanol > n-butanol > isoamyl alcohol > isobutyl alcohol. Four models, including modified Apelblat equation, λh model, NRTL model, and Wilson model, were used to correlate the experimental data of EPAB. It is found that the modified Apelblat equation, NRTL model, and Wilson model were suitable to correlate the solubility of EPAB in the selected solvents with an overall RAD less than 2%. In addition, the changes of thermodynamic properties of solution [standard molar enthalpy (ΔdisHo), standard molar entropy (ΔdisSo), and standard molar Gibbs energy (ΔdisGo)] were obtained. The results indicate that the dissolution process of EPAB in these alcohols is endothermic and an entropy-driven process.
研究领域:
物理化学
·
药学
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DOI
高影响因子
JOURNAL OF SOLUTION CHEMISTRY
·
2018
·Vol. 48
·期 3
·367-378
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IF 1.401
Li Hongxia,Guo Lijiang,Li Jianqiang
The water activities of the MgCl 2 –RbCl–H 2 O ternary system and its sub-binary systems have been measured with the isopiestic method at 323.15 K. The measured water activities for the MgCl 2 –H 2 O and RbCl–H 2 O sub-binary systems agree well with the results reported in literature. The measured equal water activity lines of the MgCl 2 –RbCl–H 2 O ternary system are not straight lines, which means the mixing behavior of the solutions do not obey Zdanovskii’s rule. The solubility of the MgCl 2 –RbCl–H 2 O ternary system has been determined with the Flow-Cloud-Point method at 323.15 K, and the measured results are roughly consistent with values reported in the literature. The Pitzer model was selected to correlate the water activity and solubility data measured in this work. The predicted water activities and solubility isotherm for the MgCl 2 –RbCl–H 2 O ternary system at 323.15 K, with binary solution parameters only, both deviated from the experiment values. The ternary solution Pitzer model parameters were obtained by fitting the measured water activities in the ternary system. The water activities and solubility isotherms of the MgCl 2 –RbCl–H 2 O ternary system at 323.15 K were calculated including both binary and ternary solution parameters. The calculated water activities are consistent with the experimental values. The calculated solubility isotherms are roughly consistent with experiment values, except they deviate somewhat in the RbCl crystallization region.
研究领域:
化学
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物理化学
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DOI
高影响因子
JOURNAL OF THE ELECTROCHEMICAL SOCIETY
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2015
·Vol. 162
·期 4
·C197
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IF 3.266
Gong Chen,Zhongning Shi,Jiangyu Yu,Junli Xu,Xianwei Hu,Zhaowen Wang,Bingliang Gao
The passivation of a graphite electrode in LiF–KF molten salt at 773 K was studied using cyclic voltammetry and electrochemical impedance spectroscopy. The anodic cyclic voltammogram showed that there are two oxidation current peaks at approximately 1.2 and 4.8 V vs. Pt quasi-reference electrode. We confirmed that carbon fluoride compounds are formed at the first current peak, while the last current peak was predominantly attributed to F2 evolution. The surfaces of the anodes used for electrolysis were analyzed at the potential of 1.0 V by X-ray photoelectron spectroscopy and Raman spectroscopy, and the anode atmosphere during the experiments was analyzed by gas chromatography. The results show that solid carbon fluoride compounds were formed in the graphite surface and no trace of gaseous carbon fluoride was detected. In addition, the active–passive transition of graphite electrode was observed in the EIS spectra recorded at 1.5 V. We confirmed the reason for the passivation of a graphite anode in LiF–KF molten salt: the formed carbon fluoride compounds layer blocks the transmission of F− anion from the electrolyte to the graphite electrode.
研究领域:
电化学
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材料科学
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DOI
高影响因子
Molecular Catalysis
·
2024
·
IF 3.9
Xiaoyu Yan,Xiaoqing Xu,Yuhan Sun,Xiuyi Li,Jiale Xu,Renjie Ji,Rui Huang,Chunyi Li
Compared with propane dehydrogenation (PDH) technology, oxidative dehydrogenation (ODH) of propane is an effective way to break through the thermodynamic constraints, which has changed the endothermic reaction into exothermic. Meanwhile, coking in PDH was significantly reduced by the presence of an oxidant in ODH of propane. Therefore, ODH of propane has attracted wide interest and has been studied in recent years. However, the contradiction between the conversion of propane and the selectivity of propene was the intrinsic problem of ODH of propane that required further study. In this work, a novel aluminum/potassium-doped mixed metal oxide catalyst Mo 1 V 0.5 Al 0.02 K 0.03 O x was synthesized using a simple co-impregnation method, whose selectivity for propene (83.2 %) and conversion of propane (12.7 %) at 300 °C were the best among all other alkali metal/alkaline-earth metal-doped catalysts. The further discussion illustrated that doping potassium and alumina could synergistically adjust the density of acid sites on the catalyst, establishing an equilibrium between high propane conversion and the ideal propene selectivity. After modification, the density of Brønsted acid decreased, leading to an enhancement in the selectivity of propene. Simultaneously, the addition of steam in the feed gas promotes propene to oxygenates and improves the conversion of propane under the condition of constant contact time.
研究领域:
化学工程
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催化材料科学
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产品关联
DOI
高影响因子
JOURNAL OF COLLOID AND INTERFACE SCIENCE
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2024
·
IF 9.4
Jun Xu,Fang Cao,Xiaoyuan Yang,Xing Chen,Yan Zhang,Junwei Chen,Liqing He,Wenpei Kang
In this work, the nanocables of few-layered ReS 2 nanosheets sandwiched between carbon nanotubes (CNTs) and nitrogen-doped amorphous carbon (NC) coating (i.e., CNT@ReS 2 @NC) are synthesized as high-performance anodes of both potassium-ion batteries (PIBs) and sodium-ion batteries (SIBs). The CNT@ReS 2 @NC nanocables with dual carbon modifications have the several advantages for efficient K + /Na + storage. The few-layered ReS 2 nanosheets with a wide interlayer spacing of 0.64 nm contribute to accelerated reaction kinetics for fast K + /Na + intercalation/extraction. The carbon nanotube skeleton with a hollow interior can effectively relieve the volume change and serve as a robust conductive network to boost structural stability . The NC layer provides rich defects as active sites and suppresses the shuttle effect of polysulfides produced in discharge/charge processes. Consequently, the CNT@ReS 2 @NC nanocables possess outstanding electrochemical performance in both PIBs and SIBs owing to the synergistic effect from the different components. A long cycling lifespan of 3500 cycles with a maintained discharge capacity of 125 mAh/g is achieved for CNT@ReS 2 @NC at 1 A/g in PIBs. In SIBs, it can keep a high capacity of 202 mAh/g over 3000 cycles at 5 A/g. Moreover, the CNT@ReS 2 @NC||Na 3 V 2 (PO 4 ) 3 full cell can exhibit remarkable cycling performance, yielding a low capacity decay rate of 0.019 % per cycle over 1000 cycles at 2C.
研究领域:
材料科学
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电化学
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产品关联
DOI
PubMed
高影响因子
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
·
2025
·
IF 6.2
Mengen Hu,Lei Liu,Zhen Wang,Xian Dang,Chengwan Yang,Xinyang Li,Ming Li,Xiaoye Hu,Yue Li,Zhulin Huang,Xinghong Zhang
The pure phase and ultrafine WB 2 powders were successfully synthesized using a liquid phase precursor synergized with boro/carbothermal reduction method. Subsequently, dense WB 2 -SiC composites (99.5%) were fabricated through hot pressing sintering. The effects of La 2 O 3 additive on the densification, mechanical properties, and ablation resistance of WB 2 -SiC composites were systematically investigated. The ablation behavior of the composites was evaluated using a plasma flame. The results indicate that the mass ablation rate of WB 2 -SiC-La 2 O 3 is 0.463 mg/s, and the linear ablation rate is 0.311 μm/s when exposed to a 2273 K plasma flame for 60 s. The excellent ablation resistance is attributed to the reaction between La 2 O 3 and SiO 2 at high temperature, which generates La 2 Si 2 O 7 , effectively pinned in the glassy phase to inhibit the volatilization of B 2 O 3 . Furthermore, La 2 O 3 also reacts with B 2 O 3 and SiO 2 to generate a highly viscous B-Si-O-La protective layer, which blocks the ingress of oxygen.
研究领域:
材料科学
·
航空航天工程
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产品关联
DOI
高影响因子
ACS Applied Nano Materials
·
2024
·
IF 5.3
Meiyang Hu,Xianwen Wang,Yajun Li,Sheng Zhong,Xuan Zhong,Rashid Khan,Jingzhe Zhao,Lu Huang,Yingpeng Wu
Constructing artificial SEI (ASEI) is an effective method to suppress dendrite growth and achieve a stable solid electrolyte interphase in a potassium metal anode. However, traditional methods for preparing ASEI still have some problems such as poor adhesion and inadequate/uneven reactions. These drawbacks significantly impede ion diffusion kinetics and the effectiveness of dendrite inhibition. In this study, an in situ reaction approach was introduced to fabricate a Fe-based protective layer on the surface of K via the spontaneous dynamic chemical reaction between Fe3O4 and K. The in situ-formed Fe-based artificial protective layer not only prevents the corrosion of the carbonate electrolyte, but also has high potassiophilicity and high ionic conductivity, which can reduce side reactions, regulate the uniform adsorption of K+, and improve the transport kinetics of K+, thus inhibiting the growth of potassium metal dendrites. With the Fe-based protective layer, the symmetric cell demonstrates a cycling stability exceeding 1700 h at 0.5 mA cm–2 and 0.5 mAh cm–2. Notably, it also exhibits a promising cycling stability and rate performance when paired with a Prussian blue (PB) cathode. This work offers insights into the development of protection layers for an advanced alkali metal anode.
研究领域:
材料科学
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电化学
·
能源存储
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产品关联
DOI
高影响因子
JOURNAL OF THE AMERICAN CERAMIC SOCIETY
·
2024
·
IF 3.5
Jiawen Li,Feifei Huang,Youjie Hua,Bingpeng Li,Shiqing Xu,Ruoshan Lei
In an effort to obtain a novel cyan-emitting phosphor, the [K 1-x Rb x ] 3 GdSi 2 O 7 : yCe 3+ materials (x = 0, 0.1, 0.2, 0.3, 0.4, y = 0, 0.005, 0.01, 0.02, 0.03, 0.04) are synthesized via a solid-state reaction pathway, and their crystal structure and luminescence behaviors are studied systematically. The chemical substitution of Rb + in the K + sites can enlarge the K 3 GdSi 2 O 7 host lattice and help to the blue-shifting of emission band of Ce 3+ ions due to the decreased crystal field splitting effect. It is also confirmed that the Ce 3+ ions tend to enter [Gd1O 6 ] and [Gd 2 O 6 ] polyhedrons simultaneously. Consequently, the [K 0.7 Rb 0.3 ] 3 GdSi 2 O 7 : Ce 3+ phosphor yields a broadband cyan emission centered at 492 nm with the full width at half maximum (FWHM) of ∼115 nm upon 365 nm excitation. The optimal concentration of Ce 3+ dopant is determined to be 0.01, and the concentration quenching effect can be attributed to the dipole−dipole interactions. The white light emitting diode (WLED) device fabricated by employing the discovered [K 0.7 Rb 0.3 ] 3 GdSi 2 O 7 : 0.01Ce 3+ phosphor displays a high color rendering index (R a = 91.7) and a low correlated color temperature (CCT = 3749 K). This work may promote the development of cyan phosphors for near ultraviolet-converted WLEDs with high performance.
研究领域:
材料科学
·
光学
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产品关联
DOI
高影响因子
JOURNAL OF SOLID STATE ELECTROCHEMISTRY
·
2026
·
IF 3.1
Ye Sifei,Li Yingnan,Liu Peng,Deng Jianghao,Tang Qiuhua,Lei Xiaoting,Zeng Xiangrong,Wen Yangping
The abnormal accumulation of purine metabolites, such as adenine (A) and hypoxanthine (Hx), is closely associated with the pathogenesis of hyperuricemia and gout, underscoring the urgent need for precise methodologies enabling their simultaneous detection. To overcome the inherent limitations of conventional analytical techniques and resolve the challenge of overlapping voltammetric signatures in electrochemical sensing, this study presents an integrated analytical strategy encompassing an advanced sensing platform, sophisticated signal processing, and intelligent data analytics. A glassy carbon electrode modified with carboxymethyl cellulose-functionalized multi-walled carbon nanotubes (CMC-fMWCNTs/GCE) serves as the foundation for highly sensitive detection. Crucially, the application of half-order derivative voltammetry effectively resolves the overlapping oxidation peaks of A and Hx, thereby enhancing analytical selectivity. Complementing this, a K -means clustering algorithm is employed to enable automated, data-driven assessment of sensing stability. These components are integrated into a web-based intelligent system that automates the complete analytical workflow, from raw data ingestion to quantitative concentration readout. The proposed system exhibits a broad linear dynamic range (0.08–80 μM), low limits of detection (0.062 μM for A and 0.075 μM for Hx), and high analytical reproducibility (relative standard deviation < 5%), while streamlining the analytical process. Collectively, this work not only achieves the precise synchronous quantification of A and Hx but also establishes a transferable analytical framework for the intelligent analysis of small molecules with analogous structural features.
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高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2026
·
IF 12.5
Xuelei Fang,Xianbo Hou,Jia Chen,Rongzhu Xia,Liming Chen
A novel fluorine-modified polyimide aerogel (FPIA) was proposed via stepwise gelation. • The dual role of fluorine was revealed in refining hierarchical pore structure and suppressing phonon transport. • FPIA achieved a 60% reduction in thermal conductivity to 0.0211 W/(m·K). • FPIA exhibited wide-frequency ultralow dielectric constant and ultralow dielectric loss. • FPIA provides a viable material strategy for extreme-environment thermal and electrical management. Polyimide (PI) aerogels have shown promising applications in aerospace and microelectronics due to their excellent thermal stability and low density. However, the simultaneous achievement of thermal insulation and ultralow dielectric constant is extremely challenging, as the optimal nanostructures for these two properties often conflict. In this study, a new type of fluorine-modified PI aerogel (FPIA) was developed by introducing fluorine-containing monomers into the molecular chain and generating nano-sized multi-level pore structures through a stepwise gelation strategy, which enabled systematic control over the density, shrinkage, and nanoporous structure. The introduced fluorine groups not only effectively refined the pore structure but also significantly reduced the thermal conductivity of the material by enhancing the scattering of phonons by inhibiting the main thermal conductive pathway of lattice vibration. The prepared aerogel, featuring a high specific surface area (>300 m 2 /g) and a multi-level pore structure, achieves a synergistically balanced comprehensive performance via multi-objective trade-off optimization: the room-temperature thermal conductivity is reduced by approximately 60%, down to 0.0211 W/(m·K), and the dielectric constant is stable at approximately 1.22 within a 4–18 GHz wide frequency range and ultralow dielectric loss of approximately 0.005. This research not only provides a feasible preparation strategy for high-performance PI aerogels but also reveals the key role of fluorine modification in synergistically enhancing insulation and dielectric properties, laying the application foundation for the development of new-generation extreme environment thermal-electric management materials.
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DOI
高影响因子
Nature Communications
·
2026
·
IF 18.1
Zhu Kaili,Shou Weiqiang,Jia Bingquan,Song Yuxiang,Wang Tao,Sun Licheng,Zhang Biaobiao
Acidic electrochemical CO 2 reduction (CO 2 RR) typically requires K + ions to create a local H + -depleted microenvironment, suppressing competing hydrogen evolution reaction (HER). Excessive localized K + causes salt precipitation, compromising electrolysis stability. Achieving stable operation with high Faradaic efficiency (FE) at low K + concentrations remains a crucial challenge for conventional nanomaterials. Inspired by water-trapping function of sponges, we design a three-dimensional interconnected porous cubic SnO 2 electrocatalyst (SnO 2 sponge) that confines OH – within porous channels to consume proton influx from the bulk, enabling durable acidic CO 2 RR towards formic acid (HCOOH). Theoretical and experimental studies reveal the SnO 2 sponge sustains substantially higher OH – concentration than dispersed SnO 2 nanoparticles. At pH 1.82, the SnO 2 sponge achieves 94.5% FE HCOOH at 800 mA cm –2 . With only 0.075 M K + , it retains 95.2% FE HCOOH at 400 mA cm –2 . Notably, it enables continuous HCOOH production at 400 mA cm –2 with 97.7% FE HCOOH for over 390 h without cleaning. This work provides a promising strategy for durable and efficient CO 2 RR in acidic media with low K + concentrations.
✓ 已验证
DOI
PubMed
高影响因子
Journal of Water Process Engineering
·
2024
·
IF 6.3
Liang He,Yanfei Liu,Huajing Zhou,Sheng Liang,Xiaolong Zhang,Zuwen Li,Zilian Liu,Rongrong Miao,Qingqing Guan
Targeted tuning of defect density in carbon-based photocatalysts is a key strategy to improve their photocatalytic performance. However, the current methods for intrinsic carbon defect sites construction are commonly with harsh conditions and costly materials, it is significant to develop more greener and cost-effective methods. In addition, the structure-activity relationship between the structural defects of material and photocatalytic performance was ambiguous up to now. Herein, a K + -assisted synthetic strategy was developed to synthesize porous carbon-based geopolymer micros (rpsBC-GPs 2 ) with abundant intrinsic defects using papermaking sludge as the precursor. And a mechanistic insight was given for explaining why the K + -induced defect density tuning made rpsBC-GPs 2 exhibit high photocatalytic activity . The introduction of K + changed the crystal structure of Quartz, calcite and pyrrhotite on the catalyst surface and promote the generation of lattice defects . The abundant lattice defects and sp 3 carbon defects of rpsBC-GPs 2 were evidenced with X-ray Photoelectron Spectroscopy, X-ray Diffraction, and scanning transmission electron microscopy measurements. In the photocatalytic process, the photogenerated electrons was driven to capture dissolved oxygen and form ·O 2, because the conduction position of rpsBC-GPs 2 was higher than the potential of O 2 /O 2 − (−0.33 eV). In addition, the high-conductive biochar play a role of “electron shuttle” in the photocatalytic process, which promoted the electrons transfer from CB to O 2 . Therefore, the production efficiency of reactive ·O 2 − was improved, and promoted the aromatization reaction process of tetracycline (TC). In this study, an industrial waste paper sludge was utilized to synthesize the active photocatalyst, and a new strategy was proposed for the photocatalytic performance evaluation, through targeted tuning of defect density in carbon-based photocatalysts using K + as activator.
研究领域:
环境科学
·
材料科学
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DOI
高影响因子
危险品化学品经营许可证（带存储）