RSC Advances
·
2024
·Vol. 14
·期 30
·21799-21807
·
IF 3.9
Yijin Sheng,Fangxu Hu,Yu Wu,De Li,Wenting Ji,Yong Chen
The electrochemical oscillation in Li-ion batteries has been reported for two-phase electrode materials of Li4Ti5O12 and LiCrTiO4, which is originated from the group-by-group phase transition in a multi-particle electrode. For both Li4Ti5O12 and LiCrTiO4, the electrochemical oscillation exhibits usually during charging, while rarely for discharging. Herein, a series of Zr-modified Li4Ti5O12 samples are prepared by using the spray-drying combined with high-temperature sintering method, and the electrochemical oscillation is observed during not only the charging process, but also the discharging process, which gradually grows up and then disappears by increasing the Li content. Compared with Li4Ti5O12, the specific capacity of Zr-modified Li4Ti5O12 decreases gradually by increasing the Zr/Ti ratio, owing to the impurity phases. According to the XRD, XPS and STEM results, the Zr element tends to accumulate on the surface to form ZrO2 nanoparticles, rather than dope into the bulk phase of Li4Ti5O12, which makes Li4Ti5O12 particles well dispersive. In contrast to the Li deficiency for only charging, the electrochemical oscillation during both charging and discharging should be attributed to the Li excess, but too much Li2TiO3 phase will suppress the electrochemical oscillation. Therefore, the Li excess can induce the electrochemical oscillation during both charging and discharging of Zr-modified Li4Ti5O12, which can be adopted to investigate the electrochemical oscillation of other materials in LIBs.
研究领域:
材料科学
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电化学
·
电池技术
·
纳米技术
✓ 已验证
DOI
高影响因子
JOURNAL OF POWER SOURCES
·
2025
·
IF 7.9
Xin Miao,Yunxin Shi,Liying Wang,Zhenzhu Cao,Yongfeng Zhang,Shaohua Luo
Hollow Co/CoO@NSCO nanospheres were synthesized via solvothermal derivation from dual-ligand Co-MOF, followed by controlled calcination. The calcination-temperature-mediated tuning of Co/CoO ratios and oxygen vacancy concentrations significantly enhanced lithium storage performance. Optimized Co-450 (450 °C calcination) delivered exceptional reversible capacities of 1112.5 mAh g −1 at 0.2 A g −1 after 100 cycles and 605.6 mAh g −1 at 1 A g −1 after 1000 cycles. Ex situ XRD confirmed metallic Co's role as an electrochemically inactive conductive matrix, while oxygen vacancies (65.7 % by XPS) facilitated rapid Li + diffusion. Kinetic analysis revealed hybrid charge storage: capacitive effects (68 % contribution at 1 mV s −1 ) dominated by pseudocapacitance from Co 2+ /Co 3+ redox couples, complemented by diffusion-controlled processes. The hierarchical hollow structure accommodated volume changes, and heteroatom-doped carbon enhanced electronic conductivity. This work demonstrates calcination-driven phase engineering as a viable strategy for high-performance anodes.
研究领域:
材料科学
·
电化学
·
纳米技术
·
储能
✓ 已验证
产品关联
DOI
高影响因子
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
·
2022
·
IF 5.518
Yang Zhao,Yi He,Siming Yan,Changhua Li,Hongjie Li,Wen Chen,Jing Yan,Guiyang Wu,Xi Yuan
Owing to the increasingly stringent environmental regulations, eco-friendly waterborne epoxy (WEP) coating currently gets much attention as an alternative choice of traditional coating. But the intrinsic problems of WEP, including poor barrier property and lack of long-term anticorrosion performance, was a limitation for its application. Herein, α-zirconium phosphate (α-ZrP) was prepared and exfoliated under mild condition. Then α-ZrP after exfoliation was functionalized by eco-friendly phytic acid (PA) molecular and a novel nano-filler (PZ) was obtained. The test results of the XRD , FTIR, SEM, TEM and XPS indicated that the preparation of nano-materials was successful. Through the EIS test, the outstanding barrier property of WEP incorporating with PZ was proved. Moreover, the excellent long-term anticorrosion performance of WEP incorporating with PZ was also proved by the salt spray test .
研究领域:
材料科学
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涂层与薄膜
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环境科学
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纳米技术
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF APPLIED POLYMER SCIENCE
·
2022
·Vol. 139
·期 29
·e52649
·
IF 3.057
Chen Gao,Junbo Jiang,Juan Wang,Yutong Wang,Yangyang Zhang,Caihua Rao,Yue Cheng,Zhongrong Chen,Runhuai Yang,Gang Zhao
Mineralization of hydroxyapatite mineralized by acidic metal oxides has attracted substantial research interest in the research and development of orthopedic substitutes. In this study, Polycaprolactone (PCL) nanofibers with nano-tantalum oxide (Ta 2 O 5 ) were successfully fabricated through electrospinning. The scaffold simulates the mineralization process of hydroxyapatite in simulated body fluid. However, in the process of mineralization, there is a chemical reaction between hydrophobic scaffolds and acid oxides, which is believed to have a significant impact on the biological effects of the scaffolds. The results of SEM, EDS, XRD, Mapping, FTIR, GPC, 13 CNMR, and 1 HNMR explain the principle of hydroxyapatite mineralization by Ta 2 O 5 and the reason why the composite scaffold is blurred, that is, the carbonyl carbon of PCL attacked by the surface hydroxyl groups of Ta 2 O 5 to catalyze its ring-opening polymerization to synthesize PCL/Ta 2 O 5 nanocomposites in one step. In order to accurately explore the effect of this reaction on the metabolism of biological macromolecules in the future, we provide a detailed route of Ag Nanoparticles -Dimercaptosuccinic acid@Transcription activator (AgNPs-DMSA@TAT) probe synthesis. The results provide a reference for the sedimentation of hydroxyapatite induced by acid oxides and its effect on traditional electrospun fiber scaffolds.
研究领域:
材料科学
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生物材料
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骨科
·
生物医学工程
✓ 已验证
DOI
高影响因子
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
·
2025
·
IF 8.3
Chaoen Li,Ziyu Zhang,Li Che,YuYang Zhou,Honglin Gao,Hanjie Sun,Aiyi Dong
Electrolyzing seawater presents a promising strategy to address the energy crisis. The optimally sulfur-doped S 0.45 -MnCr layered double hydroxide (LDH) catalyst demonstrates exceptional hydrogen evolution reaction (HER) performance in alkaline seawater at 50 °C, requiring overpotentials of only 57.9 mV and 245.4 mV to achieve 10 and 500 mA cm −2 , respectively. For overall seawater splitting, it requires only 1.72 V to deliver 100 mA cm −2 . When used as a cathode in a magnesium-seawater batteries (MSBs), it delivers a power density of 7.80 mW cm −2 . Sulfur doping simultaneously triggers the formation of highly active MnCO 3 during synthesis. Characterization confirms that sulfur doping promotes chromium leaching, thereby enlarging the electrochemical active surface area (ECSA). In situ XRD analysis at various potentials verifies the formation of additional active MnCO 3 species during HER, consistent with the activity enhancement observed in chronopotentiometric measurements. This work offers novel insights for designing bifunctional catalysts for direct seawater electrolysis.
✓ 已验证
产品关联
DOI
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
·
2021
·
IF 7.312
Ling Liu,Yanbo Li,Man Xu,Cunwen Wang
Two-dimensional Co ultrathin metal–organic framework nanosheets (Co-UMOFNs) were synthesized and blended into poly (ether block amide) (PEBA) to prepare composite mixed matrix membranes on PVDF supports for the pervaporation of phenol aqueous solution. The membranes were characterized by XRD, ATR-IR, TGA, CA and SEM measurements. Effects of the Co-UMOFNs loading, feed temperature and feed concentration on phenol separation performance were investigated. The results showed that Co-UMOFNs have a two-dimensional layered morphology and have good compatibility with the PEBA. A “brick and mortar” architecture morphology was achieved after incorporating Co-UMOFNs into the PEBA membrane. The amorphous PE segments in the PEBA were turned into a crystalline structure, restricting the motion of PE segments. The filling of Co-UMOFNs slightly improved the thermal stability and hydrophobicity as well. With the increase of the Co-UMOFNs loading from 0% to 40%, the phenol separation factor increased from 27 to 45, and the total flux decreased from 1.2 kg m -2 h - 1 to 0.42 kg m -2 h - 1 , when separation of 1000 ppm phenol solution at 70 °C. The interlayer galleries induced by the Co-UMOFNs stacking increased the tortuosity, and the crystalline structure of the Co-UMOFNs-PEBA improved the energy barriers of water penetration. Therefore the water flux was inhibited and the phenol separation factor increased. Depression of water permeation can be another protocol to prepare high-performance organophilic pervaporation membranes.
研究领域:
材料科学
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化学工程
·
膜技术
✓ 已验证
DOI
高影响因子
JOURNAL OF SOLID STATE CHEMISTRY
·
2021
·
IF 3.498
Biao Wu,Meng Yan,Fen Luo,Xiaoyan Shu,Yi Liu,Guilin Wei,Zhentao Zhang,Yi Xie,Xirui Lu
Spent nuclear fuel contains 129 I, which has deleterious effects on human health. This study focused on the immobilization of iodine waste forms via a novel preparation method with B 2 O 3 –Bi 2 O 3 –ZnO–SiO 2 glass at 500–600 °C. The XRD results manifest that the sample with 30 wt % iodine sintered at 550 °C exhibits an obvious amorphous phase. The density of the samples with different iodine contents increases with the temperature increasing, so does the amorphous fraction except for 25 wt %. The FT-IR results reveal the matrix is mainly composed of [BO 3 ], [BO 4 ], [SiO 4 ], and [BiO 6 ]. TGA analysis shows high water content in the prepared samples. SEM-EDS results present that at 550 °C one part of the iodine is chemically immobilized into the glass matrix, and meanwhile, the other physically packed by the vitrified bulk. Our findings demonstrate the potential of the new preparation method for the disposal of iodine waste forms.
研究领域:
核废料管理
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材料科学
·
环境工程
✓ 已验证
产品关联
DOI
高影响因子
CANADIAN JOURNAL OF CHEMICAL ENGINEERING
·
2018
·Vol. 96
·期 12
·2586-2592
·
IF 1.265
Renjie Deng,Kuiyi You,Fangfang Zhao,Pingle Liu,He'an Luo
In this work, a simple method for the highly selective preparation of valuable dinitronaphthalene from 1-nitronaphthalene employing NO 2 as a nitrating agent has been developed. The results demonstrated that HY zeolite as an eco-friendly and stable catalyst exhibits good catalytic performances. The total selectivity to valuable dinitronaphthalene compounds including 1,5-, 1,4-, and 1,3-dinitronaphthalene can reach 87.6 % in our present nitration reaction. Meanwhile, the physico-chemical properties of catalysts were characterized by XRD, FTIR, TG/DTG, BET, and NH 3 -TPD, and the probable nitration reaction mechanism was also suggested in this paper. The present nitration process seems to be a mild, eco-friendly, and economical route for the preparation of valuable dinitronaphthalene compounds.
研究领域:
化学工程
·
催化
·
环境化学
✓ 已验证
DOI
高影响因子
INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
·
2019
·
IF 4.784
Xianbao Li,Shunjing Luo,Yaqin Hou,Yunfei Liu,Xiuting Hu,Chengmei Liu
This study aimed to reveal the effect of corn oil on formation of complex between rice starch and fatty acids, including lauric acid (C12:0), myristic acid (C14:0), palmitic acid (C16:0) and stearic acid (C18:0). The RVA, XRD, DSC and CLSM analysis confirmed formation of starch-fatty acid complex but the starch-triglyceride complex was not detected. The addition of triglyceride promoted formation of starch-C16:0 and starch-C18:0 complexes, which might be due to more leached amylose induced by oil. However, triglyceride inhibited formation of starch-C12:0 and starch-C14:0 complexes, which might be due to high solubility of C12:0 and C14:0 in oil. In conclusion, the effect of triglyceride on formation of starch-fatty acid complex depended on the chain length of fatty acids.
研究领域:
食品科学
·
化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
MATERIALS CHEMISTRY AND PHYSICS
·
2020
·
IF 3.408
Bo Li,Hansheng Leng,Wei Liu
A new low-temperature sintered microwave ceramic Ca 5 Ni 2 Mg 2 V 6 O 24 (CNMVO) was synthesized by a solid-state reaction method. The effect of sintering process on microstructures and microwave properties of CNMVO ceramics was investigated in detail. XRD results and EDS analyses show that CNMVO ceramics sintered at 850–925 °C are the uniform solid solution with a stable cubic garnet structure. The CNMVO ceramic sintered at 875 °C has the highest Q × f value and is accompanied by the volatilization of vanadium observed by SEM . TG curves demonstrate that the increase of heating rate weakens the vanadium loss. According to the Raman spectra , the Q × f value reaches the maximum value at a heating rate of 2 °C/min, because of the highest cation ordering degree and the densest packing fraction caused by the properly deficient vanadium. As a result, the Ca 5 Ni 2 Mg 2 V 6 O 24 ceramic sintered at 875 °C with a heating rate of 2 °C/min exhibits the best microwave properties: ε r = 8.07, Q × f = 60,613 GHz, and τ f = −32 ppm/°C.
研究领域:
材料科学
·
陶瓷
·
微波工程
✓ 已验证
产品关联
DOI
高影响因子
CORROSION SCIENCE
·
2019
·
IF 6.355
Yunxing Pan,Shengli Cheng,Hang Dong,Nan Li,Feng Bao,Jinyan Wang,Xigao Jian
A novel oxidation resistant thermoset polymer (MSCB) with excellent thermo-oxidative stability and good solubility was designed and synthesized. To prevent C/C composites from oxidation, a series of MSCB polymer-based coatings were prepared by precursor infiltration and thermal-curing at 300 ℃. The oxidation behaviour of the MSCB-, MSCB/TiO 2 -, MSCB/ZrO 2 - and MSCB/SiC-coated C/C composites was studied. The improved oxidation resistance of the C/C composites was attributed to the good adhesion of the coatings and the formation of a borosilicate protective layer on the surface of the coatings, which was confirmed by the results of TGA, SEM, XPS, and XRD analyses.
研究领域:
材料科学
·
聚合物化学
·
复合材料
·
表面工程
✓ 已验证
产品关联
DOI
高影响因子
APPLIED SURFACE SCIENCE
·
2016
·
IF 3.15
Chengxin Fu,Yinyan Gong,Yitao Wu,Jiaqi Liu,Zhen Zhang,Can Li,Lengyuan Niu
Visible-light photodegradation test revealed that B and Zr co-doping can raise the photocatalytic ability of the undoped TiO 2 by a fold. XRD crystallography and Raman phonon spectroscopy measurements suggest that the Zr 4+ ions replace the Ti 4+ ions while the B 3+ ions occupy the interstitial sites, expanding the unit-cell volume and reducing crystallite size. The incorporation of interstitial boron dopants creates oxygen vacancies (Ov ) and reduce Ti 4+ to Ti 3+ to form [Ov -Ti 3+ ] + , which traps the carriers and prolongs carrier lifetime. Moreover, Zr 4+ ions replace Ti 4+ ions and form impurity levels, which could improve visible light response. The co-doped samples are benefited from both B interstitials and Zr substitutes.
研究领域:
材料科学
·
化学
·
环境科学
✓ 已验证
产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）