APPLIED SURFACE SCIENCE
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2022
·
IF 7.392
Fangya Qi,Lianyi Shao,Xiaoyi Lu,Guoping Liu,Xiaoyan Shi,Zhipeng Sun
Establishing heterostructure is an effective strategy to improve the cycling and rate properties of electrode due to high charge transfer kinetics. Nevertheless, it is still a great challenge to prepare a reasonable heterojunction material with appropriate electrochemical property as anode for Na/K ion batteries. In this work, a novel MXene derivative consisted of TiSe 2 /TiO 2 /C heterostructured hexagonal prism has been prepared by a simple solid phase sintering method to converting Ti 3 C 2 T x MXene to TiSe 2 /TiO 2 /C. In this composite, TiSe 2 and TiO 2 with different work functions can induce a built-in electric field in the heterojunction interface, accelerating the electrochemical courses. Serving as an anode material for Na ion batteries , TiSe 2 /TiO 2 /C can keep a discharge capacity of 280 mAh g −1 at 5 A g −1 after 1000 cycles and a superior rate capability with 212 mAh g −1 even at 10 A g −1 . Even using as anode for K ion batteries , TiSe 2 /TiO 2 /C can still retain a capacity of 121 mAh g −1 at 0.1 A g −1 after 800 cycles. This work supplies a simple approach to design metal oxide/selenide heterostructures toward Na/K ion batteries with excellent performance and promotes the application of MXene derivatives in the field of energy storage.
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JOURNAL OF CHEMICAL AND ENGINEERING DATA
·
2022
·
IF 3.119
Xing-Xing Zeng,Shi-Hua Sang,Xiao-Yun Qi,Xiao-Feng Guo,Rui-Zhi Cui
Aiming at the composition of underground brines in the Sichuan Basin of China, stable phase equilibria in quaternary systems LiBr–NaBr–SrBr2–H2O and LiBr–KBr–SrBr2–H2O at 288.15 K are studied using the isothermal dissolution equilibrium method. The solubilities of salts in the quaternary systems listed above are measured, and the corresponding equilibrium solid phases are identified using X-ray powder diffraction. As a result, the corresponding phase diagrams of the two quaternary systems are plotted, respectively. In the two stable phase diagrams, there is no solid solution or complex salt at 288.15 K. For the quaternary system LiBr–NaBr–SrBr2–H2O, there are two invariant points, five univariate curves, and four solid crystallization regions, which are LiBr·2H2O, NaBr, NaBr·2H2O, and SrBr2·6H2O, respectively, of which LiBr·2H2O has the smallest crystallization field, indicating that its solubility is the largest and it is the hardest to be precipitated from the saturated solution. There are one invariant point, three univariate curves, and three solid crystallization fields, corresponding to LiBr·2H2O, KBr, and SrBr2·6H2O in the quaternary system LiBr–KBr–SrBr2–H2O, respectively. The experimental results show that the solubilities of salts KBr, NaBr, and SrBr2 in the saturated solution decrease with the increasing concentration of LiBr, which indicates that LiBr has a strong salting out effect on KBr, NaBr, and SrBr2 in the solution.
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VACUUM
·
2022
·
IF 4.11
Xinyu Ai,Zhiguo Zhang
In order for SO 3 measurement without impurity gas interference in coal-fired power plants, a quantitative measurement model for sulfate in the temperature range of 298.15–343.15 K based on vacuum ultraviolet absorption spectroscopy was created. A vacuum ultraviolet absorption spectrum measurement system that eliminates oxygen interference was set up, and the vacuum ultraviolet absorption of sulfate was ascertained at 1 atm pressure by means of vacuum combined with nitrogen purging. The law of the vacuum ultraviolet absorption of sulfate with temperature was revealed, that the full width at half maximum ( FWHM ) and peak absorbance ( A max ) both increased linearly with temperature. The quadratic function relationship between the integrated area ( OP ) of the vacuum ultraviolet absorption spectrum of sulfate and temperature was found, and a universal sulfate concentration measurement model was established in the temperature range of 298.15–343.15 K. The average relative calculation error of this model for 0.0025 mol L −1 sulfate was as low as 0.6%, which supports the measurement of trace sulfate.
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ChemNanoMat
·
2022
·Vol. 8
·期 6
·e202200047
·
IF 3.82
Min Zhou,Jiajun Ma,Wensheng Yang,Shengshang Lu,Benfu Tao,Liren Qiu,Xinhai Wang,Quan Xie,Yunjun Ruan
Graphical Carbon-coated vanadium oxides with K + ion pre-embedded (KVO-C3) were hydrothermally synthesized by reducing glucose as a carbon source. The improved crystallinity of KVO-C3 facilitates Zn 2+ intercalation/extraction, which delivers a superior specific capacity of 389.2 mAh g −1 at 0.1 A g −1 and retains 83.5% capacity as current density increases 50 times. The KVO-C3 battery shows a high energy density of 209 Wh kg −1 at a power density of 3500 W kg −1 . Recently, aqueous zinc-ion batteries have become a promising candidate for energy storage devices due to their low cost, high capacity, and environmental friendliness. However, the low electrical conductivity and irreversible Zn 2+ intercalation/extraction of cathode materials limit the rate performance and cycling stability of Zn-ion batteries. Herein, carbon-coated V 2 O 5 nanoflowers with K + pre-embedment (KVO-C) were synthesized by hydrothermal and high-temperature annealing methods, showing enhanced electrical conductivity and crystallinity. Assembled with Zn anode and 2 M Zn(CF 3 SO 3 ) 2 electrolyte, the optimized KVO-C3 battery achieves a high specific capacity of 389.2 mAh g −1 at a current density of 0.1 A g −1 and retains 85% even with a 50-fold increase in current density and cycling back to 0.1 A g −1 . KVO-C3 also shows excellent capacity retention of 77% and coulomb efficiency of nearly 100% after 2000 cycles and delivers a high energy density of 209 Wh kg −1 at a power density of 3500 W kg −1 .
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Journal of Energy Chemistry
·
2022
·
IF 13.599
Hao Li,Liqun Wang,Nan Li,Jianmin Feng,Feng Hou,Sihui Wang,Ji Liang
Electrocatalytic nitrogen reduction reaction (eNRR) at the ambient conditions is attractive for ammonia (NH 3 ) synthesis due to its energy-efficient and eco-friendly features. However, the extremely strong N≡N triple-bonds in nitrogen molecules and the competitive hydrogen evolution reaction lead to the unsatisfactory NH 3 yield and the Faradaic efficiency (FE) of eNRR, making the development of high-performance catalysts with adequate active sites and high selectivity essential for further development of eNRR. Addressing this, we herein report a Bi and K dual-doped titanium oxide (BTO@KTO) material, which is prepared by a cation exchange reaction between K 2 Ti 4 O 9 and molten BiCl 3 , for high-performance eNRR catalysts. Benefiting from the controllable molten-salt cation exchange process, a highly active surface containing Bi/K sites and rich oxygen vacancies has been obtained on titanium oxide. Under the synergy of these two merits, an efficient eNRR catalysis, with the NH 3 yield rate of 32.02 μg h −1 mg cat. −1 and the FE of 12.71%, has been achieved, much superior to that of pristine K 2 Ti 4 O 9 . This work thus offers a high-performance electrocatalyst for eNRR, and more importantly, a versatile cation-exchange strategy for efficiently manipulating materials' functionalities.
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INORGANIC CHEMISTRY
·
2023
·
IF 4.6
Jingfang Zhou,Pifu Gong,Mingjun Xia,Aimin Ji,Lifang Zhang,Huiqiang Wu,Qian Wu
Replacing alkali metals (K, Na atoms) by an alkaline-earth metal (Ba atom), α-Ba3Sc2(BO3)4 (high-temperature phase) is successfully obtained by a molten salt method, taking Ba2K1.6Na0.4Sc2(BO3)4 as the parent template. Although both of them exhibit similar layered structures composed of ScO6 and BO3 units, α-Ba3Sc2(BO3)4 shows largely distorted ScO6 octahedra (Δd = 0.56) forced by the uniform tension of a larger space effect from BaO12 polyhedrons, rather than regular ScO6 octahedra like in Ba2K1.6Na0.4Sc2(BO3)4. Experimental measurements and calculated analyses elucidate that distorted ScO6 octahedra in α-Ba3Sc2(BO3)4, displaying a second-order Jahn–Teller (SOJT) effect, enlarge the experimental birefringence up to 0.14@550 nm, while Ba2K1.6Na0.4Sc2(BO3)4 with regular ScO6 octahedra only shows Δn = 0.11 under the same condition. In addition, other optical and thermal properties of the two title compounds were characterized. The experimental results indicate that Ba2K1.6Na0.4Sc2(BO3)4 and α-Ba3Sc2(BO3)4 are promising birefringent materials.
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INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
·
2023
·
IF 4.2
Qiongqiong Luo,Jinshun Lei,Ziyu Zhuang,Dewen Zeng
The solubility data of the MgF2–MnF2–MnSO4–H2O quaternary system and its subsystems are crucial for the removal of magnesium ions from a MnSO4 aqueous solution as the MgF2 precipitate. However, these data recorded at 298.15 K have not been reported, except for the MnF2–MnSO4–H2O system. In this study, the solubility isotherms of the MgF2–MnF2–H2O, MgF2–MnSO4–H2O, and MgF2–MnF2–MnSO4–H2O systems at 298.15 K and MnF2 solubility in pure water at various temperatures were systematically measured. The results show that MgF2 solubility initially decreases sharply followed by a gradual decrease as the MnF2 concentration increases. MgF2 solubility rises with increasing MnSO4 concentration in pure MnSO4 and the MnF2-saturated MnSO4 aqueous solution. MgF2 solubility in the MnF2-saturated MnSO4 aqueous solution decreases to 2.3–6.5% of its value in the pure MnSO4 aqueous solution at a certain MnSO4 concentration. MnF2 solubility increases with increasing temperatures in the MnF2–H2O system. A Pitzer–Simonson–Clegg model incorporated in the ISLEC software was used to simulate and predict the solubility curves of the MgF2–MnF2–MnSO4–H2O quaternary system and its subsystems. The model satisfactorily represented the solubility data of the subbinary and subternary systems of the MgF2–MnF2–MnSO4–H2O quaternary system within the analysis error, except for the solubility isotherms of the Mg(Mn)SO4·7H2O, Mg(Mn)SO4·4H2O, and Mg(Mn)SO4·H2O solid solutions. The predicted solubility data of the MgF2–MnSO4–H2O system at 298.15 K agree well with the experimental data with a slight deviation of the MgF2–MnF2–MnSO4–H2O system. Based on the established model, the variation of MgF2 solubility curves with the addition of anhydrous MnF2 in MnSO4 aqueous solutions at different concentrations was predicted. The study provides theoretical guidance for removing magnesium ions from a MnSO4 aqueous solution via MgF2 precipitation.
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ACS Applied Energy Materials
·
2023
·
IF 6.4
Mengcheng Zhou,Hongxia Chen,Shuangwu Xu,Xinyu Zhang,Rihuang Nie,Cheng Li,Yutian Yang,Hongming Zhou
O3-type layered oxide materials are regarded as the most application-prospective cathode materials for sodium-ion batteries owing to the high theoretical specific capacity and good full-cell matching. However, there are still problems, such as poor rate performance and low available specific capacity. In this paper, we propose to overcome the above-mentioned problems by using K to replace the Na sites of O3-NaNi0.5Mn0.3Ti0.2O2 materials. A series of K-doped materials, KxNa1–xNi0.5Mn0.3Ti0.2 (x = 0, 0.025, 0.05, 0.075), were successfully synthesized. When the doping amount is 0.05, the available specific capacity and rate performance are significantly improved. The K0.05Na0.95Ni0.5Mn0.3Ti0.2 sample exhibits an initial discharge specific capacity of 151.6 mAh g–1 at 0.1C (1C = 200 mA g–1), in the voltage window of 2.0–4.2 V, while the pristine one only delivers 135.8 mAh g–1 at 0.1C. It still delivers an initial discharge specific capacity of 119.8 mAh g–1 at 5C and 70.2 mAh g–1 after 200 cycles, while the pristine one only has a specific capacity of 36 mAh g–1 after 200 cycles. The X-ray diffraction (XRD), transmission electron microscopy (TEM), X-ray photoelectron spectroscopy (XPS), electrochemical impedance spectroscopy (EIS), and galvanostatic intermittent titration technique (GITT) tests were conducted to investigate the effect of different K doping amounts on the crystal structure and electrochemical properties. The results indicate that the expanded Na layer spacing and improved Na+ diffusion coefficient are the primary reasons for the improved electrochemical properties. This finding could provide insights into improving the rate performance and available specific capacity of the O3-type layered oxide materials.
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Advanced Healthcare Materials
·
2023
·
IF 10
Panqin Ma,Zheng Luo,Zhiguo Li,Yuchao Lin,Zibiao Li,Zhen Wu,Changliang Ren,Yun-Long Wu
Mitochondrial potassium ion channels have become a promising target for cancer therapy. However, in malignant tumors, their low expression or inhibitory regulation typically leads to undesired cancer therapy, or even induces drug resistance. Herein, this work develops an in situ mitochondria-targeted artificial K + channel construction strategy, with the purpose to trigger cancer cell apoptosis by impairing mitochondrial ion homeostasis. Considering the fact that cancer cells have a lower membrane potential than that of normal cells, this strategy can selectively deliver artificial K + channel molecule 5F8 to the mitochondria of cancer cells, by using a mitochondria-targeting triphenylphosphine (TPP) modified block polymer (MPTPP) as a carrier. More importantly, 5F8 can further specifically form a K + -selective ion channel through the directional assembly of crown ethers on the mitochondrial membrane, thereby inducing mitochondrial K + influx and disrupting ions homeostasis. Thanks to this design, mitochondrial dysfunction, including decreased mitochondrial membrane potential, reduced adenosine triphosphate (ATP) synthesis, downregulated antiapoptotic BCL-2 and MCL-1 protein levels, and increased reactive oxygen species (ROS) levels, can further effectively induce the programmed apoptosis of multidrug-resistant cancer cells, no matter in case of pump or nonpump dependent drug resistance. In short, this mitochondria-targeted artificial K + -selective ion channel construction strategy may be beneficial for potential drug resistance cancer therapy.
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高影响因子
JOURNAL OF CHEMICAL THERMODYNAMICS
·
2021
·
IF 3.178
Lan Yang,Xiuxiu Yang,Dan Li,Liwei Zhuang,Lingzong Meng,Tianlong Deng,Yafei Guo
The solubilities and refractive indices in the systems Na 2 SO 4 –NaBO 2 –H 2 O and NaCl–Na 2 SO 4 –NaBO 2 –H 2 O at 323.15 K were studied by the isothermal dissolution method. The phase diagram of the ternary system is composed of two single-salt crystallizations for Na 2 SO 4 and NaBO 2 ·4H 2 O. A comparison of the diagrams of system Na 2 SO 4 –NaBO 2 –H 2 O from 288.15 K to 323.15 K shows that the crystallization region of NaBO 2 ·4H 2 O changes greatly as the temperature increasing, and the solid phase of mirabilite at 288.15 K and 298.15 K transforms into the nardite at 308.15 K and 323.15 K. The dry-salt diagram of the quaternary system consists of four salt crystallization fields for NaCl , NaBO 2 ·4H 2 O, NaCl·NaBO 2 ·2H 2 O and Na 2 SO 4 , five univariant solubility curves and two invariant points. On the basis of the Pitzer model, the lacking Pitzer parameters and dissolution equilibrium constants of the solid phases in this quaternary system were fitted with the solubilities and other thermodynamic properties in this study and literature. The calculated solubilities in the two systems are in good agreement with the experimental data.
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CHEMISTRY-A EUROPEAN JOURNAL
·
2021
·Vol. 27
·期 35
·9031-9037
·
IF 5.236
Yibo Zhang,Yuying Zheng,Hongbo Geng,Yang Yang,Minghui Ye,Yufei Zhang,Cheng Chao Li
Graphical Novel structured M 2 P 2 O 7 /C (M=Fe, Co, Ni) nanoflake composites are prepared via an organic-phosphors precursor assisted solvothermal method and a post high temperature annealing process, which could deliver superior potassium storage performance. Metal phosphates have been widely explored in lithium ion batteries and sodium ion batteries owing to high theoretical capacities, mild toxicity and low cost. However, their potassium ion battery applications are less reported due to the limited conductivity and the slow diffusion kinetics. Considering these drawbacks, novel structured M 2 P 2 O 7 /C (M=Fe, Co, Ni) nanoflake composites are prepared through an organic-phosphors precursor-assisted solvothermal method and a subsequent high temperature annealing process. The designed Co 2 P 2 O 7 /C composite exhibits the highest rate capacity with 502 mAh g −1 at 0.1 A g −1 and good cyclability for 900 cycles at 1 A g −1 and 2 A g −1 when compared with Ni and Fe based composites. The superior electrochemical performance can be attributed to their unique nanoparticle-assembled nanoflake structure, which can afford enough active sites for K + intercalation. In addition, the robust pyrophosphate crystal structure and the in situ formed carbon composition also have positive effects on enhancing the long-term cycling performance and the electrode's conductivity. Finally, this organic-phosphors precursor induced simple approach can be applied for easy fabrication of other pyrophosphate/carbon hybrids as advanced electrodes.
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JOURNAL OF MOLECULAR LIQUIDS
·
2021
·
IF 6.165
Xiaofang Niu,Han Liu,Su Xue,Jinli Zhang,Wei Li
The solubility data of flonicamid (FA) in twelve mono-solvents (methanol (MA), ethanol (EA), n-propanol (NPA), isopropanol (IPA), n-butanol (NBA), isobutanol (IBA), ethyl acetate (EAC), butyl acetate (BAC), acetone (AT), acetonitrile (AN), tetrahydrofuran (THF), 1,4-dioxane (DX)) and a binary solvent of EA + EAC were experimentally measured by using a gravimetric method under atmospheric pressure. The tested temperature range for the studied solvents was from 283.15 K to 323.15 K except of 288.15–323.15 K for DX. Powder X-ray diffraction (PXRD) was applied to evaluate the crystal form of FA, and no solvate or new form formation were observed during the whole experiment. The experimental results show that the rising temperature leads to the increase of the FA solubility in all the studied mono and mixed solvents at the tested ranges. For mono-solvents, the solubility of FA at 293.15 K increases in the order: IBA (0.002641) < IPA (0.004243) < NPA (0.004361) < NBA (0.004750) < BAC (0.006844) < EA (0.006864) < EAC (0.01342) < MA (0.01394) < DX (0.01747) < AN (0.02455) < THF (0.03433) < AT (0.04645). For EA + EAC mixed solvents, the solubility of FA increases and then decreases with the rising mole fraction of EAC. That means addition of EAC to EA can alter the FA solubility. Density functional theory (DFT) calculations were performed to analyze the interactive energy between FA and the solvent molecules. Furthermore, the Apelblat equation, van’t Hoff equation, λh equation are applied to correlate the experimental solubility data of FA in mono and mixed solvent systems, while NRTL model and Wilson model are selected for mono-solvents, CNIBS/R-K model and Jouyban-Acree model for mixed solvents. Correlated results demonstrate that the Apelblat model provides the best regression. In addition, the dissolution thermodynamic properties of FA in chosen solvents are analyzed by the van’t Hoff equation. It suggests that the dissolution processes of FA are non-spontaneous, endothermic and entropy increase in these studied systems.
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