JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS
·
2018
·
IF 3.046
Ting Wang,Qing Ma,S.-H. Song
Pure and Ba-Zr co-doped multiferroic BiFeO 3 nanopowders are synthesized via sol-gel method. X-ray diffraction demonstrates the transformation of crystal structure (from R3c to R3c + P4mm) and the absence of impurity phase. Scanning electron microscopy and transmission electron microscopy indicate that the co-doping leads to a decrease in particle size and the Bi 0.85 Ba 0.15 Fe 0.95 Zr 0.05 sample has a particle size of 30–60 nm. Surprisingly, the room-temperature magnetization hysteresis loops change to be soft ferromagnetic with co-doping. The maximum and remnant magnetizations of the as-prepared nanopowders first increase and then decrease with increasing dopant concentration with the Bi 0.85 Ba 0.15 Fe 0.95 Zr 0.05 sample having the best magnetic properties. The enhanced magnetization is due to the crystal lattice distortion caused by the ionic-radius difference between the substituent and host elements and the suppression of the antiferromagnetic spiral spin structure induced by the size effect of the nanopowders.
研究领域:
材料科学
·
纳米科技
·
多铁性材料
·
固态化学
·
磁学
✓ 已验证
DOI
高影响因子
SOLAR ENERGY MATERIALS AND SOLAR CELLS
·
2024
·
IF 6.3
Junchi Wang,Hui Li,Ndzondelelo Bingwa,Hao Yu,Guoning Li,Qiangqiang Xiao,Shijie Li,Min Guo,Xiaoling Ma
In this study, UiO-66(Zr) and its derivative (UiO-66-C) are employed as supports to prepare shape stabilized PCM (U/SA-X and UC /SA-X) for resolving the melting leakage and poor thermal conductivity of stearic acid (SA). Thermal storage performance, including phase change enthalpy, supercooling degree, phase change temperature, thermal conductivity, and shape stability of U/SA-X and UC/SA-X, are compared. Preliminary characterization reveals that the physicochemical property evolution of the support impacts the thermal storage performance of SA . UiO-66 with microporous structure is unfavorable to enhance the shape stability of SA. U/SA-X exhibits low thermal storage efficiency and high supercooling degree owing to nanoconfinement and hydrogen bonding. By contrast, UiO-66-C possesses mesopores and graphitic structure that allows for a remarkable thermal storage performance of UC/SA-X. In detail, UC/SA-50 exhibits an ideal thermal storage performance, where the thermal conductivity (0.531 W/(m·K)) increases by 141 % in comparison to SA with a high phase change enthalpy of 93.6 J/g and low supercooling degree of 0.24 °C. It also shows satisfying thermal reliability that the thermal property of UC/SA-50 maintains stability even after 100 thermal cycles. In addition, the photothermal conversion efficiency of UC/SA-50 is up to 83.06 %.
研究领域:
材料科学
·
能源工程
✓ 已验证
产品关联
DOI
高影响因子
SENSORS AND ACTUATORS B-CHEMICAL
·
2023
·
IF 8.4
You Lei,Yuting Gao,Yi Xiao,Pengcheng Huang,Fang-Ying Wu
Developing a fluorescence sensor capable of precisely identifying highly toxic nerve agents has become a focus of research, given that they are easily available and can be used by terrorists to threaten the security of the world. In this work, we designed a ratiometric fluorescence sensing platform with Cu 2+ -modified UiO-66-NH 2 (Cu 2+ @UiO-66-NH 2 ) and o-phenenediamine (OPD) as signal indicators and successfully used for the liquid and gas detection of the nerve agent simulant diethyl chlorophosphate (DCP). UiO-66-NH 2 obtained oxidase activity by simple Cu 2+ modification, which catalyzed the oxidation of OPD to give a yellow fluorescent product 2, 3-diaminophenazine (DAP). In this detection system, the fluorescence of UiO-66-NH 2 was greatly enhanced by blocking the ligand metal charge transfer (LMCT) process inside the framework by DCP. At the same time, the amino group of DAP was phosphorylated by DCP, and the attenuation of DAP fluorescence was observed by the static quenching effect. In addition, the Cu 2+ @UiO-66-NH 2 /OPD loaded agarose hydrogel device can be used to detect DCP vapor with naked eyes and showed satisfactory detection result (LOD: 6.65 ppb).
研究领域:
化学传感器
·
环境科学
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
MICROCHIMICA ACTA
·
2024
·Vol. 192
·期 1
·1-11
·
IF 5.3
Tian Siyu,Wang Jiahui,Jie Yu,Ding Zhu,Wang Xiao,Wang Jijiang,Hou Xiangyang
A novel nanobiosensor was constructed by in situ locating nanometer MnO 2 particles with controllable size and morphology in a Zr-MOF substrate to serve as an electrochemical probe. The synergistic effect of the two components, Zr-MOFs with high specific surface area and compatibility as a carrier for MnO 2 , resulted in improved electrochemical activity and excellent electrochemical identification performance for the MnO 2 @Zr-MOF/GCE biosensor. Under optimized experimental conditions and using CV and DPV technology, the biosensor showed a wide linear detection range (2–200 μM), a low detection limit (2.577 × 10 −8 M), a recovery range (106.26–115.01%), and maximum relative standard deviation (5.155) for tetracycline (TC) identification. The recognition mechanism of the sensor was investigated adopting Laviron adsorption theory. The applicability of the sensor was verified through practical measurements. Overall, the MnO 2 @Zr-MOF/GCE sensor possesses the advantages of fast analysis speed, high sensitivity, high selectivity, and simple operation, making it suitable for detecting trace amounts of TC in food. Graphical abstract
研究领域:
分析化学
·
食品安全
✓ 已验证
产品关联
DOI
PubMed
高影响因子
ACS Applied Energy Materials
·
2022
·
IF 6.959
Jian Sun,Shengbin Bai,KeKe Li,Yue Zhou,Yuning Chen,Lei Liu,Zijian Zhou
CaCO3/CaO materials possess the advantages of low cost, high energy storage density, and working temperature, which offer these materials the potential to be used in thermochemical energy storage systems for concentrated solar power plants. However, CaCO3/CaO materials possess poor antisintering and optical absorption abilities, largely limiting their practicability for direct solar utilization. In this study, binary ion doping of Fe/Mn and Zr-based stabilizer incorporation were simultaneously conducted to improve the cyclic thermal energy storage/release performance of CaCO3/CaO materials. The spectral absorbance of synthetic CaO-based composites (ranging from 77.8% to 84.0%) doped with binary ions of Fe/Mn is greatly increased in comparison to that of pure CaO (∼12.2%) due to the generation of black Ca2Fe2O5 and Ca4Mn3O10. The cyclic thermal energy storage/release performances of synthetic CaO-based composites were comparatively investigated under two thermal energy storage modes (CSP-N2 and CSP-CO2). The Zr-doped, CaO-based composites exhibit a cycling stability superior to those of Zr-free CaO-based composites due to the generated inert CaZrO3 with desirable antisintering ability, and the superiority is more prominent under CSP-CO2 mode. After 50 cycles, the CaO-based composite with a molar ratio of Ca:Zr = 100:6.7 exhibits a remarkably stable energy release density of 1.02 MJ/kg under CSP-CO2 mode, retaining 88.9% of its initial energy release density.
研究领域:
材料科学
·
可再生能源
·
太阳能技术
✓ 已验证
产品关联
DOI
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
·
2022
·
IF 9.136
Jiaxin Qu,Xueqian Wang,Langlang Wang,Bowen Xu,Ping Ning,Yixing Ma,Yibing Xie,Rui Cao,Qiang Ma
A nonmetallic N-doped Zr/Ti-based catalyst was prepared to investigate the effect of N addition on catalytic performance for carbon disulfide (CS 2 ) hydrolysis. The characterization of the catalyst indicated that doped N atoms were present as interstitial N in the TiO 2 lattice, resulting in an increase in the number of basic sites of the catalyst from 1.64 to 2.37 and from 0.68 to 2.53 for weakly basic and strongly basic sites, respectively. In addition, the doping of N promoted the formation of OH groups, which were favorable for the hydrolysis of CS 2 , from water (H 2 O) adsorbed on the catalyst, thus greatly improving the performance of catalytic CS 2 hydrolysis. However, N doping reduced the amount of chemisorbed oxygen on the catalyst surface from 44.7% to 33.4%, thus decreasing the oxidation reaction of the hydrolysis product H 2 S and improving the stability of the catalyst. CS 2 hydrolysis reaction activity and catalyst lifetime were tested. The experimental results demonstrated that the catalytic CS 2 hydrolysis performance was greatly improved after N doping, and the temperature to obtain 100% conversion was reduced from 180 °C to 130 °C. Selectivity to H 2 S was greatly improved with N-doped catalysts. Furthermore, the resistance of the catalyst to sulfate was improved. Nonmetallic N-doped Zr/Ti-based catalysts offer a new strategy for blast furnace gas desulfurization.
研究领域:
催化化学
·
环境科学
✓ 已验证
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2018
·
IF 6.735
Chuanzhi Sun,Hao Liu,Wei Chen,Dezhan Chen,Shuohan Yu,Annai Liu,Lin Dong,Shuai Feng
A series of Sm- and/or Zr-doped MnO x -TiO 2 catalysts were prepared, and the catalysts exhibited better N 2 selectivity and SO 2 resistance than the undoped MnO x -TiO 2 catalyst for the selective catalytic reduction of NO by NH 3 (NH 3 -SCR). The reasons for the good N 2 selectivity and SO 2 resistance of the catalysts were proposed. X-ray photoelectron spectroscopy (XPS) combined with density functional theory (DFT) calculations suggested that electron transfer between the manganese and samarium species by Mn 4+ + Sm 2+ ↔ Mn 3+ + Sm 3+ redox cycles occurred in the Sm-containing catalysts. Furthermore, electron transfer from Sm 2+ to Mn 4+ suppressed electron transfer from NH 3 to Mn 4+ , inhibiting the formation of NH 2 or NH. Thus, the pathway for NH generation was removed, and the reaction of 2NH + 4NO → 3N 2 O + H 2 O was prevented. Consequently, the N 2 selectivity of the NH 3 -SCR reaction was enhanced. In situ diffused reflectance infrared Fourier transform spectroscopy ( in situ DRIFTS) combined with thermogravimetry, differential scanning calorimetry and mass spectrometry (TG-DSC-MS) results revealed that the deposition rate of sulfate species decreases after Sm doping, which was also attributed to the suppressed electron transfer from SO 2 to Mn 4+ , i.e., the oxidation of SO 2 to SO 3 . Thus, the catalysts exhibited better SO 2 resistance.
研究领域:
催化化学
·
环境科学
✓ 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
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
·
电化学
·
电池技术
·
纳米技术
✓ 已验证
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2021
·
IF 13.273
Yun Fan,Haijun Zhang,Meihui Ren,Yichi Zhang,Yun Li,Longxing Wang,Jiping Chen
It is of great significance to develop the low-temperature catalysts for the reduction in emission of chlorinated aromatic hydrocarbons (CAHs) from the industrial thermal processes. In this work, the bimetallic Ce-Zr/UiO-66 catalysts were synthesized by a solvothermal method to degrade CAHs. Powder X-ray diffraction, Fourier transform infrared spectra and X-ray photoelectron spectroscopy analyses showed that cerium was successfully incorporated into the lattice of Zr/UiO-66 without destroying the structure of metal–organic frameworks. The activities of Ce-Zr/UiO-66 catalysts for CAHs degradation varied with the concentration of cerium. Ce 0.2 Zr 0.8 /UiO-66 with the highest surface area (1502 m 2 g −1 ) presented the highest efficiency (>85%) for hexachlorobenzene degradation at low heating temperature (100–150 °C) with less formation of polychlorinated dibenzo- p -dioxins and dibenzofurans. Appropriate amount of water (5 wt%) and nitrogen atmosphere were beneficial to improve degradation efficiency. The degradation products proved that hydrodechlorination and oxidation of CAHs both occurred on the catalysts.
研究领域:
环境化学
·
催化
·
材料科学
✓ 已验证
DOI
高影响因子
Catalysis Science & Technology
·
2023
·Vol. 13
·期 20
·5902-5911
·
IF 5
Haoxi Jiang,Liping Yi,Guochao Yang,Lingtao Wang
Hierarchical Zr-β zeolite is a promising catalyst in the conversion of ethanol to 1,3-butadiene owing to the improved accessibility of active sites inside the zeolite to bulky substrates. Accordingly, hierarchical nanocrystalline Zr-β zeolite with sufficient intercrystalline mesoporosity and microporosity was prepared in this work via silanization-based hydrothermal synthesis. A systematic investigation was conducted to determine the effect of the secondary porosity on the textural, acidic and catalytic properties. The results suggested that neither acid amount, strength nor location varied with the additional secondary porosity. However, an appropriate proportion of micropores and mesopores would provide significant contributions to enhanced catalytic performance, arising from the available confined environment around the active sites inside the micropores, enhanced accessibility of such sites and improved diffusion of reactants and products due to mesopores.
研究领域:
化学工程
·
催化
·
材料科学
✓ 已验证
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2022
·
IF 16.744
Zimo Wang,Yaohan Chen,Li Wang,Jifu Zheng,Yong Fan,Suobo Zhang
The development of new adsorbent materials to improve adsorption capacity and selectivity constitutes a significant research direction for removing toxic ions from water. In this study, a series of Zr-based metal–organic framework hierarchical porous nanofibre membranes (MOFs@PIM-W) was designed and successfully synthesised, and their adsorption properties and mechanism for fluoride ions in water were investigated. The formation of Zr–F bonds in Zr-based MOFs is a primary reason for the rapid, effective, and stable removal of fluoride ions from water. Moreover, in contrast to common powder adsorbents and the conventional static adsorption process, the obtained hierarchical porous nanofibre membranes improve the removal rate of fluoride ions, which may be attributed to the formation of hierarchical porous structures. Specifically, by modifying the types of MOFs, the obtained nanofibre membranes can effectively remove Hg(II) ions from water under a wide range of pH environments (pH = 2–10) with a removal rate of up to 99 %. This indicates that the hierarchical porous design of nanofibre membranes incorporated with their specific adsorption provides a viable option for rapidly and efficiently removing toxic ions from water.
研究领域:
环境科学
·
材料科学
·
水处理
·
纳米技术
✓ 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）