JOURNAL OF ALLOYS AND COMPOUNDS
·
2018
·
IF 3.779
Xiaolan Chen,Tian Wang,Wanzheng Lu,Tianxiang Cao,Mingzhe Xue,Bing Li,Cunman Zhang
A modified solution method was applied to synthesize cubic garnet solid-state electrolyte Li 7 La 3 Zr 2 O 12 (LLZO) and Li 6.45 Ca 0.05 La 2.95 Ta 0.6 Zr 1.4 O 12 (LCLTZO). The synergetic doping of Ca and Ta is found to induce the formation of cubic LCLZTO with high ionic conductivity of 4.03 × 10 −4 S cm −1 while LLZO without substitution exhibits tetragonal phase with low conductivity. A Li-S cell with sulfur cathode and as-prepared LCLTZO solid electrolyte “separator” was conducted to deliver large initial discharge capacity of 1090 mAh g −1 with high initial Coulombic efficiency up to 92%. Cell with LCLTZO also exhibited better cycling performance at 0.2 C and extremely high Coulombic efficiency (close to 100%) than the cell without solid electrolyte. Better rate performance was also achieved at lower rate (0.2 C, 0.5 C and 1 C) by cell with LCLTZO although it lost advantages at higher rate of 2 C and 5 C due to the limitation of ionic conductivity of LCLTZO. Energy dispersive X-ray spectroscopy (EDS) provided direct evidence that LCLTZO solid electrolyte greatly suppressed the shuttle effect generated by polysulfides . The electrochemical impedance spectroscopy was applied to discuss the difference between cells with and without LCLTZO during the discharge process. Charge transfer reaction referred to soluble polysulfides was found to be slower in cell with LCLTZO than that in cell without solid electrolyte.
研究领域:
材料科学
·
电化学
·
能源存储
✓ 已验证
产品关联
DOI
高影响因子
ACS Sustainable Chemistry & Engineering
·
2021
·
IF 8.198
Kun Gao,Mengxia Shen,Chao Duan,Chuanyin Xiong,Lei Dai,Wei Zhao,Wanli Lu,Shujiang Ding,Yonghao Ni
A reasonable design of the pore structure of carbon nanofiber-based electrocatalysts can effectively accelerate the slow kinetics of the oxygen reduction reaction (ORR) and oxygen evolution reaction (OER). In this study, we report an electrospinning method by adding supramolecular coordination polymers to selected polyacrylonitrile (PAN) and cellulose acetate (CA) spinning systems. Benefiting from the difference in the thermal decomposition temperature of each component during the pyrolysis process, CA was applied as a sacrificial template to prepare a high-efficiency ORR/OER bifunctional electrocatalyst (Co-N@PCNFs-0.2) with directional hollow channels and a hierarchical pore structure. This unique multichannel carbon nanofiber morphology and hierarchical pore structure led to abundant active sites while also boosting the electron transfer rates. Notably, applying Co-N@PCNFs-0.2 as an air electrode to Zn–air batteries results in a large specific discharge capacity of 884 W h kgZn–1 and a maximum power density of 151 mW cm–2.
研究领域:
材料科学
·
电化学
·
纳米技术
·
能源存储
✓ 已验证
DOI
高影响因子
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
·
2023
·Vol. 34
·期 24
·1-17
·
IF 2.8
Fan Yan,Wang Lei,Sun Xueqin,Li Cuili,Liu Jiacheng
A series of UiO-66-NH 2 -CA-Cu/g-C 3 N 4 (UCC 1 /CN x ) heterogeneous photocatalysts were constructed via a facile physical mixing treatment of the covalently post-modified MOF (UiO-66-NH 2 -CA-Cu) and functional materials g-C 3 N 4 . The tetracycline removal by the photocatalysis coupled with persulfate activation were studied under white light irradiation. The optimal UCC 1 /CN 20 photocatalyst showed the best photocatalytic performance, in which 94.0% TC could be efficiently eliminated ( k = 0.08669 min −1 ) within 30 min. The satisfactory degradation performance could be ascribed to the effective separation of photogenerated electron-hole pairs over the heterogeneous binary structure, which were demonstrated by several characteristic technologies including photoluminescence spectra, electrochemical impedance spectroscopy, transient photocurrent response and Bader charge analysis based on density functional theory calculations. Moreover, a possible mechanism behind the photocatalytic degradation was proposed and further affirmed by the quenching experiments and electron spin resonance measurements. Our work may supply a feasible idea for treating wastewater contained organic pollutants based on the heterogeneous photocatalyst.
研究领域:
环境科学
·
材料科学
·
化学工程
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF DISPERSION SCIENCE AND TECHNOLOGY
·
2019
·
IF 1.479
Wei Zhang,Yee-Kwong Leong,Chunbao Sun,Hong Fan,Xianwei Zhang
The yield stress and zeta potential of washed spherical α-Al2O3 suspensions with two to four layers of critic acid(CA) and polyethyleneimine(PEI_Mw1.8and 70 kDa) adsorbed sequentially were characterized. With CA adsorbed as the first layer, pHξ=0 was shifted to a lower pH and the maximum yield stress (τymax) was reduced. With PEI adsorbed as the first layer, the pHξ=0 was moved slightly higher. With the introduction of the second layer, the CA/PEI additive was formed which functioned as a bridging agent. The pH range of yield stress was broadened significantly and increased with the number of layers. This pH ranged from 2.5 to 11. The CA/PEI multilayer additive loses its positive charge at pH >11. There was less adsorption in layer3 and layer4 when lower Mw PEI is applied to the suspension. The CA/PEI multilayer additive formed by PEI of Mw70000 and CA was larger in size than that formed by PEI of Mw 1800 and CA. Lower Mw PEI produced a stronger flocculated network or higher τymax suspension due to a higher concentration of multilayer additive. CA/PEI multilayer additive was participating in bridging and particle bridging interaction was not affected by the adsorption order of CA and PEI.GRAPHICAL
研究领域:
材料科学
·
化学工程
·
胶体科学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF CHEMICAL AND ENGINEERING DATA
·
2017
·
IF 2.323
Jian-nan Yin,Xin-ying Shi,Huan Zhou,Jing-jing Tang,Ya-ping Dai,Xiao-qin Bai
Fine calcium hypophosphite can be synthesized by sodium hypophosphite and calcium chloride via the replacement reaction, and sodium hypophosphite can be synthesized from phosphorus via the intermediate of Ca(H2PO2)2. Both processes involve the interactive quaternary system of (Ca2+ + Na+)//(Cl– + (H2PO2)− + H2O) and its subsystems. In this study, the (solid + liquid) phase diagrams of the (Ca(H2PO2)2 + H2O) binary system from freezing to boiling point at normal pressure, and (Ca(H2PO2)2 + CaCl2 + H2O), (Ca(H2PO2)2 + NaH2PO2 + H2O) ternary systems at 273.15 K were experimentally determined via the classical isothermal solubility equilibrium method. It was found that (1) one anhydrous salt of Ca(H2PO2)2 occurs in (Ca(H2PO2)2 + H2O) binary systems with temperatures ranging from freezing to boiling points, (2) two solid salts of Ca(H2PO2)2 and CaCl2·6H2O exist in the (Ca(H2PO2)2 + CaCl2 + H2O) system, and (3) Ca(H2PO2)2, NaH2PO2·H2O and one incompatible double salt of NaCa(H2PO2)3 exist in the (Ca(H2PO2)2 + NaH2PO2 + H2O) system, and NaCa(H2PO2)3 has very low solubility and occupies a large solid field in the ternary system.
研究领域:
无机化学
·
化学热力学
·
相平衡
·
材料合成
✓ 已验证
DOI
高影响因子
Nature Communications
·
2024
·Vol. 15
·期 1
·1-8
·
IF 14.7
Geng Shitao,Zhao Xiaoju,Xu Qiuchen,Yuan Bin,Wang Yan,Liao Meng,Ye Lei,Wang Shuo,Ouyang Zhaofeng,Wu Liang,Wang Yongyang,Ma Chenyan,Zhao Xiaojuan,Sun Hao
Rechargeable calcium (Ca) metal batteries are promising candidates for sustainable energy storage due to the abundance of Ca in Earth’s crust and the advantageous theoretical capacity and voltage of these batteries. However, the development of practical Ca metal batteries has been severely hampered by the current cathode chemistries, which limit the available energy and power densities, as well as their insufficient capacity retention and low-temperature capability. Here, we describe the rechargeable Ca/Cl 2 battery based on a reversible cathode redox reaction between CaCl 2 and Cl 2 , which is enabled by the use of lithium difluoro(oxalate)borate as a key electrolyte mediator to facilitate the dissociation and distribution of Cl-based species and Ca 2+ . Our rechargeable Ca/Cl 2 battery can deliver discharge voltages of 3 V and exhibits remarkable specific capacity (1000 mAh g −1 ) and rate capability (500 mA g −1 ). In addition, the excellent capacity retention (96.5% after 30 days) and low-temperature capability (down to 0 °C) allow us to overcome the long-standing bottleneck of rechargeable Ca metal batteries.
研究领域:
材料科学
·
电化学
✓ 已验证
DOI
高影响因子
Environmental Technology & Innovation
·
2018
·
IF 0
Jiaorong Yan,Feixiang Zhou,Ying Zhou,Xianghao Wu,Qiulian Zhu,Huayan Liu,Hanfeng Lu
The removal of NO x with low oxidation degree, low temperature, and high vapor content from small coal-fired boiler emission through selective catalytic reduction is difficult. This study investigated liquid oxidation and absorption to remove NO x systematically. Thermodynamic calculation showed that the equilibrium constants of the NO oxidation and NO x absorption reaction are high; thus, NO x treatment by liquid oxidation and absorption is feasible. Four oxidants (NaClO 2 , NaClO, H 2 O 2 , and KMnO 4 ) and four absorbents (Ca(OH) 2 , CaCO 3 , NaOH, and Na 2 CO 3 ) were used to study the reaction mechanism of the oxidation and absorption processes. Results show that NaClO 2 solution is the best oxidant, and the optimum pH value of the oxidation reaction is 5–6. The oxidation degree reaches 100% when the concentration of the NaClO 2 solution is 1.0%, and the oxidation degree can still reach approximately 50% when the concentration is 0.1%. Ca(OH) 2 slurry has the best absorption performance among the four kinds of absorbents. The NO x removal efficiency of Ca(OH) 2 slurry can reach approximately 70% when the oxidation degree is 50%. The removal efficiency is up to 80% when the oxidation degree is 100%.
研究领域:
环境科学
·
化学工程
✓ 已验证
产品关联
DOI
Planetary Science Journal
·
2025
·Vol. 6
·期 3
·55
·
IF 4.3
Erbin Shi,Xiaojia Zeng,Jian Chen,Enming Ju,Zongcheng Ling
Calcium sulfates are widely distributed in Gale crater and Endeavour crater on Mars. However, the mole ratios of Ca2+ and SO3 in some Sr–Ba-rich sulfate veins are less than 1. This indicates that there may be additional solid solution phases on Mars, including Ca–Sr, Ba–Sr, and Ca–Ba sulfates, which, on Earth, are typically found in marine environments. In this study, we synthesized a series of Ca–Sr, Ba–Sr, and Ca–Ba sulfate solid solutions in the laboratory. These synthesized solid solutions were then characterized using various techniques, including X-ray powder diffraction (XRD), Raman, mid-infrared, and visible and near-infrared. Our results show that the XRD and Raman spectra of Ca–Sr and Ba–Sr sulfates varied with their cation contents. In particular, the linear relationships (R2 ≥ 0.98) between the mole ratios of cation ions and peak positions of {{\rm{SO}}}_{4}^{2{-}} tetrahedron (v1) in Raman spectra were obtained. The mole content of Ca2+, Sr2+, and Ba2+ can be precisely constrained in Ca–Sr, Ba–Sr, and Ca–Ba sulfate solid solution phases through linear relationships, respectively. These results are the experimental basis for analyzing in situ detection data (e.g., SHERLOC, SuperCam, and Oxia planum) and can be used to precisely constrain the mineral phases of calcium sulfate veins on Mars.
研究领域:
地质学
·
行星科学
·
光谱学
✓ 已验证
产品关联
DOI
高影响因子
ACS Biomaterials Science & Engineering
·
2017
·
IF 3.234
Ying Hao,Jinrong Peng,Yaguang Zhang,Lijuan Chen,Feng Luo,Cheng Wang,Zhiyong Qian
Breast cancer has been the first killer among women. In this study, combretastatin A-4 (CA-4) loaded 5-amino acid peptide Ala-Pro-Arg-Pro-Gly (APRPG) modified PEG-PDLLA mixed micelles was developed to target tumor neovasculature for breast cancer therapy. CA-4 is an effective vascular disrupting agent. The APRPG-modified PEG-PDLLA polymer was successfully synthesized and thin-film hydration method was used to prepare APRPG-PEG-PDLLA/MPEG-PDLLA mixed micelles. Drug loading capacity (DL), encapsulation efficiency (EE), and the optimized ratio of APRPG-PEG-PDLLA: MPEG-PDLLA for efficient drug loading was investigated. The particle size, zeta potential, morphology, and the crystallographic study were carried out to characterize the micelles. In vitro release study revealed a sustained release of CA-4 from the mixed micelles while compared to free CA-4. Moreover, the cytotoxicity data of blank and drug loaded mixed micelles suggested that the APRPG-PEG-PDLLA/MPEG-PDLLA mixed micelles were safe drug carriers and the encapsulated CA-4 remained potent antitumor effect. The cellular uptake study and the in vivo imaging and biodistribution study demonstrated that the APRPG peptide modified mixed micelles has the higher cellular uptake efficiency and could significantly facilitate the accumulation at tumor site. Furthermore, the micelles were slowly extravasated from blood vessels and inhibited embryonic angiogenesis in the transgenic zebrafish model. Consequently, the CA-4 loaded APRPG-PEG-PDLLA/MPEG-PDLLA mixed micelles group demonstrated a significant inhibition of tumor growth in 4T1 breast cancer model. In short, the CA-4 loaded APRPG-PEG-PDLLA/MPEG-PDLLA mixed micelles might have great potential for breast cancer therapy.
研究领域:
肿瘤学
·
药剂学
·
生物医学工程
✓ 已验证
DOI
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
·
2025
·
IF 9
Lu Yu,Xiaomeng Liu,Rongping Yun,Min Wang,Xu Xiang
Oilfield brine, a by-product of oil and gas extraction, contains valuable resources such as Li + , K + and Ca 2+ , offering potential utilisation benefits but also presenting separation challenges. We developed a reaction-coupled separation strategy to separate Ca 2+ and Li + while simultaneously synthesising a calcium-based layered double hydroxide (Ca-based LDH) from the brine. This technology enables the recovery of over 90 % of Ca 2+ into the solid product, with 98.5 % of Li + retained in the liquid phase, achieving highly efficient separation of Ca 2+ and Li + . The resulting Ca-based LDH demonstrated excellent capacity for removing heavy metals, such as Cu 2+ , Ni 2+ and Zn 2+ , from electroplating wastewater. The removal capacities reached up to 384.2 mg/g for Cu 2+ , 319.3 mg/g for Ni 2+ and 367.9 mg/g for Zn 2+ . In both single-cation and mixed-cation wastewaters, metal concentrations were dramatically reduced to parts-per-billion (ppb) levels. Kinetic studies indicated rapid adsorption behaviour of Cu 2+ , Ni 2+ and Zn 2+ by the Ca-based LDH. Mechanistic analysis revealed that Ca 2+ ions in the LDH layers are isomorphously substituted by Cu 2+ , Ni 2+ and Zn 2+ from the solution, forming Cu-, Ni- and Zn-containing LDHs with enhanced structural stability. Additionally, the released Ca 2+ ions precipitate with CO₃ 2− , derived either from intercalated anions or carbonate in the water. Such conditions promote further substitution of Ca 2+ in the LDH layers by Cu 2+ , Ni 2+ and Zn 2+ , resulting in robust metal removal and ultralow residue concentrations in the treated wastewater. This work presents an efficient, economical and sustainable approach for the simultaneous separation and utilisation of oilfield brine resources and treatment of electroplating wastewater.
✓ 已验证
产品关联
DOI
高影响因子
Journal of the Mechanical Behavior of Biomedical Materials
·
2022
·
IF 4.042
Hongxing Kong,Xingxing Bai,Huaizhu Li,Chucheng Lin,Xiaohong Yao,Yueyue Wang
The purpose of this work was to fabricate and characterize Ca doped wrinkled porous silica (Ca-WPS), and evaluate their effect on the mineralization and mechanical properties of resin composites as functional fillers . Ca-WPS were prepared by sol-gel method and characterized by scanning electron microscopy, transmission electron microscopy and N 2 adsorption–desorption measurements. The mineralization properties of the prepared Ca-WPS particles and the resin composites with different amount of Ca-WPS were evaluated by simulated body fluid (SBF) immersion method. The mechanical properties (flexural strength, flexural modulus , compressive strength and microhardness) of the dental resins containing unimodal Ca-WPS fillers and bimodal Ca-WPS fillers with nonporous silica were evaluated by a universal testing machine. Results showed that after immersing in SBF for 5 d, apatite formed on the surface of Ca-WPS and composites containing Ca-WPS fillers, indicating the excellent mineralization property of the prepared Ca-WPS. The mechanical properties of the dental resins increase with the increase of the proportion of unimodal Ca-WPS fillers. The dental resins with bimodal Ca-WPS fillers showed better mechanical properties than the group with only nonporous fillers at the same filler loading (60 wt%). Among all the samples, the dental composites filled with bimodal fillers (mass ratio of Ca-WPS: nonporous silica = 10:50, total filler loading 60 wt%) exhibited the best mechanical performance. The flexural strength, flexural modulus, compressive strength and microhardness of these samples were 26.96%, 42.75%, 16.04% and 54.1% higher than the composites with solid silica particles alone, respectively. Thus, the prepared Ca-WPS could effectively improve the apatite formation and mechanical properties of resin composites.
研究领域:
材料科学
·
牙科学
·
生物医学工程
✓ 已验证
产品关联
DOI
PubMed
高影响因子
CARBOHYDRATE POLYMERS
·
2022
·
IF 10.723
Haoyue Ning,Lixin Lu,Jing Xu,Lijing Lu,Liao Pan,Zidong Lin
The purpose of this study was to compare the effects of different concentrations of the amine-functionalized isoreticular metal-organic framework-3 loaded with carvacrol (IRMOF-3/CA) on the properties of sodium alginate (SA) composite films, thus determining the optimal addition amount and further preparing bioactive packaging film with antibacterial and antioxidant activities. The morphology, structure, physical properties, antioxidant and antibacterial activities of the films were characterized and analyzed. The results showed that the thermal stability and light barrier property of the films were improved by the addition of IRMOF-3/CA. When the additional concentration was 0.4 wt%, the tensile, water vapor barrier and hydrophobic properties of the films were increased by 30.13%, 9.06% and 46.43% respectively compared with those of pure SA film. Moreover, the film added with IRMOF-3/CA had sustained antioxidant and antibacterial activities , and had an apparent fresh-keeping effect on pork, suggesting its application potential in food packaging.
研究领域:
食品科学
·
材料科学
·
生物化学
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）