DOKLADY PHYSICAL CHEMISTRY
·
2025
·Vol. 520
·期 1
·1-10
·
IF 1.5
Xingbing Yang,Zhang Tingting,Zhu Jing,Wu Qian,Zhang Qin,Li Jingyi,Jiang Tingting,Xiao Qin
In this work, the isothermal solution equilibrium method was used to examine the phase equilibrium of a ternary LiCl–LiBr–CH 3 OH system at 273 and 323 K. The solubilities of LiCl and LiBr in CH 3 OH at different temperatures were measured by chemical analysis. The chemical composition of the equilibrium solid phase was determined via the wet slag method combined with X-ray diffraction. Thus, the corresponding phase diagram was created, and the LiCl–LiBr–CH 3 OH and LiCl–LiBr–H 2 O ternary systems were compared at different temperatures. The results showed that the phase diagram characteristics of the LiCl–LiBr–CH 3 OH ternary system at 273 and 323 K were similar, with a saturation point, two univariable solubility curves and two solid phase crystallization zones; these zones represented the Li(Cl,Br) solid solution crystallization zone and LiCl single salt crystallization zone. The single salt of LiCl can be separated using crystallization filtration. LiBr has a salt-out effect on LiCl, but LiBr cannot be obtained. With increasing temperature, the contents of LiCl and LiBr at the saturation point of the LiCl–LiBr–CH 3 OH ternary system increase, and the solubilities of LiCl and LiBr in methanol gradually increase.
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CHEMISTRY OF MATERIALS
·
2025
·
IF 7
Yi Yi,Pengxiang Zhang,Yixin Shen,Junhui Tan,Bao-Wen Li
Solution-processable high-k perovskite nanosheets show considerable potential for applications in printed electronics due to their unique structural properties and exceptional physical characteristics. However, their dispersibility and compatibility in various organic solvents remain insufficiently understood, with a lack of systematic investigation, which restricts their broader application potential. In this study, the dispersion behavior of high-k perovskite nanosheets, specifically Ca2Nb3O10 (CNO) and Ca2NaNb4O13 (CNNO), was examined in 20 different organic solvents. By correlating the physicochemical properties of these solvents, including surface tension, dielectric constant, and empirical solvent parameters, with Hildebrand and Hansen solubility models, we identified the underlying solvent–nanosheet interaction mechanisms responsible for dispersion stability. Polar protic solvents, such as water and methanol (MeOH), as well as polar aprotic solvents, like dimethyl sulfoxide (DMSO), acetonitrile (ACN), N,N-dimethylformamide (DMF), propylene carbonate (PC), and N-methyl-2-pyrrolidone (NMP), facilitate uniform and stable nanosheet dispersions. These solvents promote dispersion stability through strong dipole–dipole interactions and moderate surface tension matching. Based on these findings, we developed a series of organic solvent-based inks incorporating high-k perovskite nanosheets, demonstrating excellent printing adaptability for electrical device fabrication, and achieving stable device performance. This work provides a comprehensive library of organic solvents that effectively disperse high-k perovskite nanosheets, thereby broadening their potential applications in printed electronic devices.
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Science Advances
·
2023
·Vol. 9
·期 24
·
IF 13.6
Mingrui Wang,Peng Wang,Guanghui Zhang,Zening Cheng,Mengmeng Zhang,Yulong Liu,Rongtan Li,Jie Zhu,Jianyang Wang,Kai Bian,Yi Liu,Fanshu Ding,Thomas P. Senftle,Xiaowa Nie,Qiang Fu,Chunshan Song,Xinwen Guo
The decomposition of cobalt carbide (Co 2 C) to metallic cobalt in CO 2 hydrogenation results in a notable drop in the selectivity of valued C 2+ products, and the stabilization of Co 2 C remains a grand challenge. Here, we report an in situ synthesized K-Co 2 C catalyst, and the selectivity of C 2+ hydrocarbons in CO 2 hydrogenation achieves 67.3% at 300°C, 3.0 MPa. Experimental and theoretical results elucidate that CoO transforms to Co 2 C in the reaction, while the stabilization of Co 2 C is dependent on the reaction atmosphere and the K promoter. During the carburization, the K promoter and H 2 O jointly assist in the formation of surface C * species via the carboxylate intermediate, while the adsorption of C * on CoO is enhanced by the K promoter. The lifetime of the K-Co 2 C is further prolonged from 35 hours to over 200 hours by co-feeding H 2 O. This work provides a fundamental understanding toward the role of H 2 O in Co 2 C chemistry, as well as the potential of extending its application in other reactions.
研究领域:
催化化学
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化学工程
·
材料科学
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可持续能源
·
多相催化
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CHEMICAL ENGINEERING JOURNAL
·
2021
·
IF 13.273
Chunhui Wang,Haozhe Qin,Liang Cao,Dong Wang,Jiafeng Zhang,Bao Zhang,Xing Ou
Metal selenides possess tremendous potentials due to their high specific capacity for potassium storage, however the sluggish K + diffusion and polyselenide dissolution always result in inferior electrochemical performance. Herein, metal selenide (CoSe 2 ) nanorods with engineered exposed plane incorporated in reduced graphene oxide nanosheet (sc-CoSe 2 @rGO) are fabricated. In the crystalline interior, such single-crystal structure can provide unhindered path for the fast K + transfer. Besides, at the crystalline surface, the mainly exposed (011) facet with Co 2+ rich state can induce the catalytic function with enormous reaction sites, which effectively transform the polyselenide to selenide with an enhanced selenium utilization. As expected, the as-prepared sc-CoSe 2 @rGO delivers satisfied specific capacity, prominent rate property, and superior cyclic stability (a reversible capacity of 157.7 mAh g −1 at high rate of 3.0 A g −1 after 600 cycles). This single-crystalline architecture design for intrinsic K-ion diffusion and surficial optimization is pioneeringly investigated, which provides a new insight into designing and fabricating metal-ion storage materials.
研究领域:
材料科学
·
电化学
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JBMR Plus
·
2022
·Vol. 7
·期 1
·e10706
·
IF 0
Wenhuan Chai,Weiwei Hao,Jintao Liu,Zhenglin Han,Shiyu Chang,Liben Cheng,Mingxin Sun,Guofang Yan,Zemin Liu,Yin Liu,Guodong Zhang,Li Xing,Hongqian Chen,Peng Liu
The Cre/lox system is a fundamental tool for functional genomic studies, and a number of Cre lines have been generated to target genes of interest spatially and temporally in defined cells or tissues; this approach has greatly expanded our knowledge of gene functions. However, the limitations of this system have recently been recognized, and we must address the challenge of so-called nonspecific/off-target effects when a Cre line is utilized to investigate a gene of interest. For example, cathepsin K (Ctsk) has been used as a specific osteoclast marker, and Cre driven by its promoter is widely utilized for osteoclast investigations. However, Ctsk-Cre expression has recently been identified in other cell types, such as osteocytes, periosteal stem cells, and tenocytes. To better understand Ctsk-Cre expression and ensure appropriate use of this Cre line, we performed a comprehensive analysis of Ctsk-Cre expression at the single-cell level in major organs and tissues using two green fluorescent protein (GFP) reporters (ROSA nT-nG and ROSA tdT) and a tissue clearing technique in young and aging mice. The expression profile was further verified by immunofluorescence staining and droplet digital RT-PCR. The results demonstrate that Ctsk-Cre is expressed not only in osteoclasts but also at various levels in osteoblast lineage cells and other major organs/tissues, particularly in the brain, kidney, pancreas, and blood vessels. Furthermore, Ctsk-Cre expression increases markedly in the bone marrow, skeletal muscle, and intervertebral discs in aging mice. These data will be valuable for accurately interpreting data obtained from in vivo studies using Ctsk-Cre mice to avoid potentially misleading conclusions. © 2022 The Authors. JBMR Plus published by Wiley Periodicals LLC on behalf of American Society for Bone and Mineral Research. Graphical We performed a comprehensive analysis of Ctsk-Cre expression at the single-cell level in major organs and tissues using two GFP reporters. These results demonstrate that Ctsk-Cre is expressed not only in osteoclasts but also at various levels in osteoblast lineage cells and other major organs/tissues, particularly in the brain, kidney, pancreas, and blood vessels. These data will be valuable for accurately interpreting data to avoid potentially misleading conclusions.
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PubMed
Catalysts
·
2023
·Vol. 13
·期 7
·1030
·
IF 3.9
Siyi Jiang,Yujing Weng,Yangbin Ren,Shihang Meng,Xiaoman Li,Chao Huang,Yulong Zhang,Qi Sun
The chemical transformation of carbon dioxide (CO2) not only reduces the amount of carbon dioxide emitted into the Earth’s atmosphere by humans, but also produces carbon compounds that can be used as precursors for chemical and fuel production. Herein, a selective catalytic conversion of carbon dioxide to methanol is achieved by a bifunctional molybdenum disulfide catalyst (MoS2) with magnesium oxide and nickel and potassium promoters. Molybdenum disulfide prepared by the supercritical ethanol method has a large specific surface area and presents good catalytic performance with high methanol selectivity when loaded with potassium (K) and nickel (Ni) promoters. In addition, the catalysts were evaluated and it was founded that the addition of the K-promoter improved methanol selectivity. This research provides a new strategy for improved product selectivity and space–time yield (STY) of methanol in CO2hydrogenation.Keywords:CO2hydrogenation;molybdenum disulfide;methanol
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Journal of Analysis and Testing
·
2022
·Vol. 7
·期 2
·157-162
·
IF 0
Gao Su,Ye Ming-Liang,Ma Rui,Liu Ai-Rong,Gao Hong-Wen
Based on the Mg 2 + complexation with acid chrome blue K (ACBK) at pH 10.2, an automatic system was designed to determine total hardness of water. The system consists of a vector colorimeter, a multi-channel sampling pump and both reagents A and B. Two kinds of reagent solutions were prepared and used in this system, i.e., ammoniacal buffer and ACBK—disodium magnesium EDTA solutions. The experimental results of the standard solutions containing 2 and 3 mg/L of total hardness showed that the relative standard deviations (RSDs) were 1.9% and 2.2%, respectively, and the limit of detection (LOD) was only 0.035 mg/L. The detection of four natural water samples showed that the recoveries were between 85.0% and 108.6%, consistent with those obtained by ICP-AES method.
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INORGANIC CHEMISTRY
·
2022
·
IF 5.436
Ziyan Lv,Rukang Li
Two new compounds K3TaP2O9 and Na3TaP2O9 were obtained by spontaneous crystallization with KH2PO4 and K2HPO4 or NaH2PO4 and Na2HPO4 as fluxes, respectively. K3TaP2O9 belongs to the P21/m space group of the monoclinic system, with cell parameters of a = 9.8912(7) Å, b = 7.1861(5) Å, c = 13.6457(9) Å, β = 94.047(2)°, and Z = 4. In contrast, Na3TaP2O9 pertains to the P212121 space group of the orthorhombic system, with cell parameters of a = 7.1241(7) Å, b = 9.3071(10) Å, c = 12.3752(13) Å, and Z = 4. Both of the structures feature the existence of the zigzag (TaP2O9)∞ chains with the −(O4Ta)–O–(TaO4)– connection. Also, two compounds have high transparency of about 90% in the 400–2500 nm range. Theoretical calculations and powder second-harmonic generation test show that the compound Na3TaP2O9 has a large band gap of 5.5 eV, a moderate powder second-harmonic generation response of 0.6 × KDP, and a large birefringence of 0.11.
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Small
·
2021
·Vol. 18
·期 5
·2104401
·
IF 13.281
Cheng-Yi Zhu,Jing-Kai Qin,Pei-Yu Huang,Hai-Lin Sun,Nie-Feng Sun,Yan-Lei Shi,Liang Zhen,Cheng-Yan Xu
2D van der Waals (vdW) semiconductors hold great potentials for more-than-Moore field-effect transistors (FETs), and the efficient utilization of their theoretical performance requires compatible high- k dielectrics to guarantee the high gate coupling efficiency. The deposition of traditional high- k dielectric oxide films on 2D materials usually generates interface concerns, thereby causing the carrier scattering and degeneration of device performance. Here, utilizing a space-confined epitaxy growth approach, the authors successfully obtained air-stable ultrathin indium phosphorus sulfide (In 2 P 3 S 9 ) nanosheets, the thickness of which can be scaled down to monolayer limit ( ≈ 0.69 nm) due to its layered structure. 2D In 2 P 3 S 9 exhibits excellent insulating properties, with a high dielectric constant ( ≈ 24) and large breakdown voltage ( ≈ 8.1 MV cm −1 ) at room temperature. Serving as gate insulator, ultrathin In 2 P 3 S 9 nanosheet can be integrated into MoS 2 FETs with high-quality dielectric/semiconductor interface, thus providing a competitive electrical performance of device with subthreshold swings (SS) down to 88 mV dec −1 and a high ON/OFF ratio of 10 5 . This study proves an important strategy to prepare 2D vdW high- k dielectrics, and greatly facilitates the ongoing research of 2D materials for functional electronics.
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JOURNAL OF POWER SOURCES
·
2021
·
IF 9.127
Mingming Xie,Xiaobo Zhu,Danqing Li,Zhizhao Xu,Yingjia Huang,Huanyi Zha,Mei Ding,Chuankun Jia
Along with the surging demand for rechargeable alkali-ion (Li + , Na + , or K + ) batteries , cost and availability of the battery materials become critical. In this paper, we report the use of spent asphalt , which is widely available and even poses environmental risks, to produce a high-performing universal Li/Na/K-ion host material. Taking advantage of a nano-Fe 2 O 3 template, the spent asphalt is converted into mesoporous carbon with an interconnected three-dimensional porous structure , high surface area, and numerous crystal defects . As an anode material for Li-ion batteries, the mesoporous carbon exhibits a reversible capability of 674.2 mA h g −1 at 0.2 A g −1 as well as excellent rate and cycling performance (258.7 mA h g −1 at 1.0 A g −1 after 1000 cycles) owing to the shortened diffusion path of ion and easier penetration of electrolytes. The carbon anode also delivers superior reversible capacities and cycling stability in Na-ion and K-ion batteries. With the potential to simultaneously tackle energy and environmental problems, the spent asphalt-derived mesoporous carbon is promising for large-scale applications.
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Journal of Energy Chemistry
·
2020
·
IF 7.216
Hao-Jie Liang,Zhen-Yi Gu,Xue-Ying Zheng,Wen-Hao Li,Ling-Yun Zhu,Zhong-Hui Sun,Yun-Feng Meng,Hai-Yue Yu,Xian-Kun Hou,Xing-Long Wu
Graphite as a promising anode candidate of K-ion batteries (KIBs) has been increasingly studied currently, but corresponding rate performance and cycling stability are usually inferior to amorphous carbon materials. To protect the layer structure and further boost performance, tempura-like carbon/carbon nanocomposite of graphite@pitch-derived S-doped carbon (G@PSC) is designed and prepared by a facile and low-temperature modified molten salt method. This robust encapsulation structure makes their respective advantages complementary to each other, showing mutual promotion of electrochemical performances caused by synergy effect. As a result, the G@PSC electrode is applied in KIBs, delivering impressive rate capabilities (465, 408, 370, 332, 290, and 227 mA h g −1 at 0.05, 0.2, 0.5, 1, 2, and 5 A g −1 ) and ultralong cyclic stability (163 mA g −1 remaining even after 8000 cycles at 2 A g −1 ). On basis of ex-situ studies, the sectionalized K-storage mechanism with adsorption (pseudocapacitance caused by S doping)-intercalation (pitch-derived carbon and graphite) pattern is revealed. Moreover, the exact insights into remarkable rate performances are taken by electrochemical kinetics tests and density functional theory calculation. In a word, this study adopts a facile method to synthesize high-performance carbon/carbon nanocomposite and is of practical significance for development of carbonaceous anode in KIBs.
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APPLIED SURFACE SCIENCE
·
2020
·
IF 6.182
Wenchang Zhu,Hao Chen,Mengjie Zhang,Xingzhe Yang,Hongbin Feng
Defect engineering in oxides can effectively modulate their electric states and offers more active sites for electrocatalytic reactions. However, creating oxygen defects often require high processing temperatures or long-time consumption. Here, we exploited a simple and universal method to create defects in several metal oxides such as Co 3 O 4 , ZnO, SnO 2 , and CeO 2 using highly active liquid sodium-potassium (Na-K) alloy as the reducing agent at room temperature. To verify the available potential of this synthetic strategy, we choose defective Co 3 O 4 as an example and investigate its oxygen evolution reaction (OER) performance. The oxygen vacancies have a significant promotion effect on the OER activity and its starting potential is 1.54 V with a Tafel slope of 47.9 mV/dec, which is much lower than pristine Co 3 O 4 nanoparticles. Our method of creating defects in oxides may be used for many other related applications.
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