MATERIALS RESEARCH BULLETIN
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2014
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IF 1.968
Li-Ping Jia,Bing Yan
RE–Fe–B–Na (RE = Nd–Er) colloidal nanoparticles are prepared by high-temperature solution synthesis. These nanoparticles are ultra-small monodisperse, air-stable and amorphous, whose particle size and magnetic property are characterized by transmission electron microscope and superconducting quantum interference device. Taking Nd–Fe–B–Na nanoparticle as an example, it is found that the particle size can be controlled in less than 7 nm. Besides, the magnetic properties of RE–Fe–B–Na colloidal nanoparticles can be compared for different rare earth elements. Based on the bulk ferromagnetic coupling, other possible magnetic coupling mechanism is discussed.
研究领域:
材料科学
·
磁学
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DOI
高影响因子
JOURNAL OF MATERIALS SCIENCE
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2015
·Vol. 50
·期 16
·5466-5474
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IF 2.371
Chen Jiucun,Liu Yinqin,Li Wenjun,Wu Chao,Xu Liqun,Yang Huan
In this work, nanostructured polystyrene/polyaniline/reduced graphene oxide (PS–PANI/rGO) hybrid materials based on in situ reduction of graphene oxide with ascorbic acid and self-assembly have been successfully prepared for electrochemical supercapacitor and Na-ion battery applications. The supercapacitor based on the PS–PANI/rGO as an electrode material exhibits a specific capacitance of 180 F g −1 at a current density of 0.5 A g −1 from −0.4 to 1.0 V and a high energy density of 49 W h kg −1 at the power density of 352.8 W kg −1 . Moreover, the nanostructured PS–PANI/rGO has a good cycle stability (74 % capacitance retention after 5000 cycles), indicating its future potential application in electrochemical energy storage. The material is further used as an anode in Na-ion batteries, and the results show that the porous nanostructured PS–PANI/rGO delivers a high capacity of 155 mA h g −1 and keeps over 150 charge–discharge cycles at a constant current of 100 mA g −1 (0.5 C).
研究领域:
材料科学
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电化学
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DOI
高影响因子
JOURNAL OF LUMINESCENCE
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2017
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IF 2.686
Zhenwei Yang,Jihong Sun,Xia Wu,Shiyang Bai,Hamida Panezai
The Fe 3+ -modified 1, 8-naphthalic anhydride (Fe-NA) was prepared, and thereafter successfully grafted on the mesoporous surface of bimodal mesopores material (BMMs) by post-synthesis method. The influence of various parameters, including amount of Fe 3+ ion, various solvents, different concentrations and loadings of FC-NA on the fluorescence behavior of resultant hybrid materials (FC-NA grafted BMMs) was investigated, and then its fluorescence properties were compared to the parent FC-NA. Meanwhile, their structural properties and photoluminescence performances were investigated using various characterizations XRD , TEM , SEM, SAXS , FT-IR, TGA, ICP-OES, elemental analysis , N 2 adsorption-desorption isotherms, and fluorescence measurement. The results showed that the mesoporous structural integrity was remained intact after introduction of FC-NA in the mesoporous channels of APTES-BMMs. Particularly, SAXS patterns revealed the mass fractal dimension of the hybrid FC-NA@BMMs were gradually increased with increasing loaded amount of FC-NA, and resulted in the uneven distribution and self-similarity fractal features. The fluorescence profiles exhibited the occurrence of red-shifts and then blue-shifts of characteristic peak with increasing grafted FC-NA amount. These shifts demonstrated a highly aggregation on the amine-modified mesoporous surface of APTES-BMMs when the obtained mass ratio of FC-NA/AP-BMMs was lower than 0.2, whereas a uniform monodispersion distribution was observed when the mass ratio got higher than 0.2. The obtained functionalized mesoporous materials with enhanced fluorescence intensity have a potential application in drug sustained/controlled delivery systems.
研究领域:
材料科学
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光学
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DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
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2020
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IF 10.652
Yanpei Li,Xiangwei Wu,Jingyi Wang,Xingpeng Gao,Yingying Hu,Zhaoyin Wen
The sodium-nickel chloride (Na-NiCl 2 ) batteries technology has been considered as one of the most promising candidates for large-scale electrical energy storage application owing to its abundant electrode material resource, high energy density and safety. However, ultra-excessive Ni in the cathode leads to high material cost and the growth of cathode particles during cycles makes degradation of batteries performances, which hinder the further application of Na-NiCl 2 batteries. To address these challenges, we designed a free-standing Ni-less cathode with Ni/NaCl particles uniformly distributed in the three-dimensional (3D) conductive matrix constructed by carbonfiber (CF) and multiwalled carbon nanotubes (MWCNTs). The 3D hierarchical structure synthesized by low-cost vacuum filtration method can offer sufficient void space to accommodate the growth of NaCl particles and effectively enhance the electronic conductivity of the cathode. When the molar ratio of Ni/NaCl in the cathode is reduced to 1.0, a specific capacity of 90 mAh g −1 for planar Na-NiCl 2 batteries can be achieved after 170 cycles at 190 °C with a capacity retention of 67%, which is higher than that of traditional tubular Na-NiCl 2 batteries.
研究领域:
材料科学
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能源存储技术
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DOI
高影响因子
JOURNAL OF POWER SOURCES
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2013
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IF 4.675
Liping Zhao,Li Qi,Hongyu Wang
Sodium titanate nanotube (Na-TNT) sample has been prepared by a hydrothermal method using TiO 2 and NaOH as starting materials and then calcined at 400 °C in air. X-ray diffraction and N 2 adsorption–desorption tests have been employed to characterize its crystal and pore structure . The Na-TNT can be used as the negative electrode for electric energy storage devices using Na + -based organic electrolytes. The charge storage mechanism at the Na-TNT negative electrode has been investigated by electrochemical tests (galvanostatic charge–discharge, cyclic voltammetry , etc.), ex-situ XRD and HRTEM measurements. The electric energy storage devices of Na-TNT/graphite have been constructed and the influence of graphite/Na-TNT mass ratio on their performance has been studied.
研究领域:
材料科学
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电化学
✓ 已验证
DOI
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
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2023
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IF 8.6
Xiaodong Yang,Xueqin Shao,Jin Tong,Jinfeng Zhou,Ying Feng,Rui Chen,Qiang Yang,Ye Han,Xizhen Yang,Lili Wang,Xuewen Ma,Zhongqing Fan,Zhi Song,Andrew R. Zimmerman,Bin Gao
Advanced clay sorbents have attracted widespread attentions for applications in environment remediation and pollution control. Here, a facile and environmentally-friendly approach to synthesizing a porous Na-bentonite/hickory-biochar composite sorbent from hickory waste biomass using hand-milling and carbon-bed pyrolysis was investigated. The sorbents, made using a range of clay/biomass ratios and at a range of temperatures, were characterized and examined for their ability to remove Eriochrome blue black R (EBBR) anionic organic dyes from aqueous solution. The composite sorbents showed increased microporosity and O-containing functional groups over the pyrolyzed bentonite control. The composite prepared with 10% biomass by weight, and at 600 °C had the greatest EBBR adsorption, and was best fit to Freundlich isotherm and intraparticle diffusion kinetics models. The modeled maximum EBBR sorption capacity of this composite (2020.5 mg g −1 , R2 adj = 0.92), which was attributed to the dispersion of bentonite particles over the biochar surface. These results show the bentonite/biochar composite to have great potential for use in environmental remediation applications.
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DOI
高影响因子
FUEL
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2023
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IF 7.4
Xiaojian Wei,Yong Zhang,Hongzheng Zhu,Ming Yang,Jinbo Zhu
Using a high-speed motion acquisition system, the dodecane droplet size and the interface energy of the dodecane-solution interface during the collision between the dodecane droplet and the dodecane layer at different Na + concentrations were studied. The collision process is divided into three stages: Contact stage , Stretch stage and Attenuation amplitude stage . The size of the dodecane droplet gradually decreases as the Na + concentration increases, and the stretching time does too. The kinetic energy of the dodecane droplet, the surface energy of the dodecane-solution interface, and the net force of the dodecane droplet all decrease with an increase in Na + concentration, but the dodecane droplet rate of energy dissipation increases. The effect of Na + concentration on dodecane-solution interfacial tension is the main reason for the collision difference. The Na + added to the solution forms a hydration shell around it, weakening the interaction between water molecules at the dodecane-solution interface and within the solution, leading to reduced interfacial tension. The advancement of mineral flotation technology may benefit greatly from these findings.
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高影响因子
Nanomaterials
·
2022
·Vol. 12
·期 18
·3215
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IF 5.719
Jianzhong Yu,Song Ye,Xinling Xv,Ling Pan,Peixuan Lin,Huazhen Liao,Deping Wang
In this research, the LiY zeolite was firstly synthesized by using NaY as the parent zeolite; thereafter, the LiYAg and NaYAg zeolites created for formaldehyde gas detection were prepared with further Ag+-Li+/Na+exchange and a mild thermal treatment at 300 °C to promote the formation of luminescent Ag CLs. The spectra experimental results indicated that Ag CLs showed stronger and blue-shifted emissions in LiYAg compared with in NaYAg, and the emission intensity of Ag CLs in both zeolites monotonously decreased when exposed to increasing formaldehyde gas content. Moreover, the linear dependence of the Ag CLs’ emission intensity variation on formaldehyde content indicated a reliable method for fast and sensitive formaldehyde detection. According to the XPS, UV–vis absorption, and N2adsorption–desorption isotherm studies, the formaldehyde-gas-induced luminescence quenching of Ag CLs is due to the formation of Ag2O and Ag NPs, in which the higher content of Ag+/Ag0redox couples in LiYAg and larger surface area of NaYAg benefit the precise detection of formaldehyde gas in low- and high-content ranges, respectively. Furthermore, the blue-shifted peak position and widened FWHM of Ag CLs can also be used for the indication of formaldehyde gas and the detection limit of NaYAg and LiYAg, which both meet with the standards of the WHO and OSHA.Keywords:FAUY zeolite;silver clusters;luminescence property;formaldehyde detection;auger parameter
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DOI
PubMed
高影响因子
JOURNAL OF PHYSICS AND CHEMISTRY OF SOLIDS
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2022
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IF 4.383
Cheng Wang,Jiale Yu,Kai Feng,Huidong Guo,Lipeng Wang
In this study, natural clinoptilolite was treated with NaOH solutions of different concentrations under mild ambient conditions. The composition and structure of the as-prepared samples were characterized, and their performance was assessed in terms of the removal of the heavy metal ions Cd 2+ , Cu 2+ , and Cr 3+ from the aqueous solution. The results showed that the composition, structure, and capability of removal of heavy metal ions of the samples were significantly influenced by the NaOH concentrations. The crystal structure of clinoptilolite remained invariant under a relatively low NaOH concentration (≤0.5 M), began transforming into zeolite Na–P under a medium NaOH concentration (∼1.0 M), and then completely transformed into it under a high NaOH concentration (2.0–4.0 M). The samples treated with NaOH had lower SiO 2 /Al 2 O 3 ratios, and were superior to unmodified natural zeolite in removing the heavy metal ions. This method of treatment with relatively high concentrations of NaOH is a simple and effective way to transform natural clinoptilolite into the zeolite Na-P rich ion exchanger, which is suitable for removing heavy metal ions.
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高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
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2022
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IF 6.371
Ming Tang,Jia-Yi Du,Jin-Ling Ma,Xiao-Dong Wang,Xiong Zhang,Qin-Yin Shen,Fei-Peng Wang,Yu Wang
As the high energy-density energy storage and greenhouse gas capture device, Na-CO 2 battery development is impeded by the sluggish CO 2 reduction and difficult decomposition of insulating discharge products on the cathode. Here, the cobalt (Co)-decorated carbon nanofibers accompanying with slight Co oxidation were used as the self-standing cathode for Na-CO 2 battery. It greatly reduces the discharge overpotential by 500 mV and charge overpotential by 210 mV, delivers a 12 times higher discharge capacity and runs nearly 4 times cycle life than its counterpart. Experiment combined with theory calculation demonstrates that the evenly dispersive, abundant and stable active sites (Co-CoO) with an equal CO 2 adsorption-desorption capability is the key to improving cell performance. This work reveals the importance of catalysts/cathodes and provides a direction to design highly efficient catalysts/cathodes for alkali metal-CO 2 batteries.
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高影响因子
JOURNAL OF POWER SOURCES
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2021
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IF 9.127
Xianda Sun,Yuxuan Lou,Ya-Ling He,Yinshi Li
The rapid footstep of hydrogen society drives people to pursue the reliable, energy-saving, and renewable hydrogen production patterns. Herein, an electricity-hydrogen co-produced Na-ion direct formate fuel cell (e-h 2 Na-DFFC) is proposed as a conceptual avenue to link the CO 2 utilization and H 2 society. Using the solar fuel-formate that can be readily synthetized from carbon dioxide, we experimentally demonstrate the capability of e-h 2 Na-DFFC for continuous co-production of electricity and hydrogen. A proof-of-concept e-h 2 Na-DFFC yields a peak power density as high as 168 mW cm −2 at 380 mA cm −2 associating with the hydrogen production rate reaching 2.9 mL min −1 cm −2 . More importantly, the approximate 100% purity and over 98.9% Faradic efficiency suggest the great potential of this electricity-hydrogen co-production device. In addition, we explore the scalability, stability and applicability of the e-h 2 Na-DFFC. The hydrogen that is produced from the e-h 2 Na-DFFC can be directly fed to hydrogen-oxygen fuel cell, which presents a peak power density of 546 mW cm −2 and a 35-h stable operation at room temperature . This proposed e-h 2 Na-DFFC provides a new pathway for renewable hydrogen production.
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高影响因子
Journal of Materials Chemistry A
·
2021
·Vol. 9
·期 34
·18272-18279
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IF 12.732
Dongmei Dai,Jinxu Qiu,Hongying Hou,Xiaojuan Wang,Siyuan Li,Bobo Cao,Xinxin Zhou,Dai-Huo Liu,Bao Wang,Bao Li
P2-layered metal oxide cathodes exhibit great promise for use in sodium ion batteries due to their unique two-dimensional tunnel structure, high energy density and high redox potential, etc. However, the inferior structural stability and irreversible phase change of P2-layered cathodes inhibit their development. The best effective strategies to improve their structural stability and sodium storage properties are via the optimization of the P2-layered tunnel structure and morphology by adjusting the Na+ contents, lithium substitution and rational element doping. Herein, the first sub-group element (Cu2+, Ag+ and Au+) doped Na0.5Li0.07Mn0.61Co0.16Ni0.16O2 cathodes were successfully prepared and systematically studied using operando X-ray powder diffraction (XRD), Rietveld refinement with corresponding Fourier electron cloud maps and the galvanostatic intermittent titration technique (GITT). These data indicate that the lattice parameters (a/b, c and V), energy barrier, and Na+ diffraction coefficient of sub-group element-doped Na0.5Li0.07Mn0.61Co0.16Ni0.16O2 cathodes are gradually improved in line with an increase in the sub-group element radii, which facilitate the kinetics of Na+ migration due to the synergistic effect between the valence and radius. Additionally, the structural stability and sodium storage mechanism of the optimized hybrid Na0.5Li0.07Mn0.6Co0.16Ni0.16Au0.01O2 electrode was revealed via operando XRD.
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高影响因子
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