Synthesis, Doping and Electrochemical Properties of Zn3V3O8

2021 ◽  
Vol 21 (12) ◽  
pp. 6120-6125
Author(s):  
Zheng-Yong Yuan ◽  
Yao Xiao ◽  
Xiao-Qing Yang ◽  
Chuan-Qi Feng
Keyword(s):  
Solvothermal Method ◽  
Raw Materials ◽  
Specific Capacity ◽  
X Ray Diffraction ◽  
X Ray ◽  
Electrochemical Tests ◽  
Discharge Specific Capacity ◽  
Initial Discharge ◽  
Microscopy Techniques ◽  
Scanning Electron

The Zn3V3O8 was synthesized by solvothermal method combined with heat treatment using Zn(NO3)3 · 6H2O and NH4VO3 as raw materials. The Zn3V3O8 was doped by Co2+ to form Zn2.88Co0.12V3O8. The samples were characterized by X-ray diffraction and scanning electron microscopy techniques. Electrochemical tests showed that the initial discharge specific capacity for Zn2.88Co0.12V3O8 was 640.4 mAh·g−1 when the current density was 100 mA·g−1, which was higher than that of pure Zn3V3O8 (563.5 mAh · g−1). After 80 cycles, the discharge specific capacity of Zn2.88Co0.12V3O8 could maintain at 652.2 mAh · g−1, which was higher than that of pure Zn3V3O8 (566.8 mAh·g−1) under same condition. The Zn2.88Co0.12V3O8 owned better rate performances than those of pure Zn3V3O8 also. The related modification mechanisms were discussed in this paper

Solvothermal Synthesis of Bi2Se3 Hexagonal Nanosheet Crystals

2011 ◽  
Vol 236-238 ◽  
pp. 1712-1716 ◽  
Author(s):  
Hai Tao Liu ◽  
Jun Dai ◽  
Jia Jia Zhang ◽  
Wei Dong Xiang
Keyword(s):  
Electron Microscope ◽  
Solvothermal Synthesis ◽  
Solvothermal Method ◽  
Raw Materials ◽  
X Ray Diffraction ◽  
Uniform Size ◽  
X Ray ◽  
Selected Area Electron Diffraction ◽  
Transmission Electron ◽  
Scanning Electron

Bismuth selenide (Bi2Se3) hexagonal nanosheet crystals with uniform size were successfully prepared via a solvothermal method at 160°C for 22 h using bismuth trichloride(BiCl3) and selenium powder(Se) as raw materials, sodium bisulfite(NaHSO3) as a reducing agent, diethylene glycol(DEG) as solvent, and ammonia as pH regulator. Various techniques such as X-ray diffraction (XRD), field-emission scanning electron microscope (FESEM), high-resolution transmission electron microscope (HRTEM), and selected area electron diffraction (SAED) were used to characterize the obtained products. Results show that the as-synthesized samples are pure Bi2Se3 hexagonal nanosheet crystals. A possible growth mechanism for Bi2Se3 hexagonal nanosheet crystals is also discussed based on the experiment.

Electrochemical Properties of Li0.99Gd0.01FePO4/C Composite Cathode for Lithium-Ion Batteries

2010 ◽  
Vol 146-147 ◽  
pp. 1233-1237
Author(s):  
Bin Sun ◽  
Yi Feng Chen ◽  
Kai Xiong Xiang ◽  
Wen Qiang Gong ◽  
Han Chen
Keyword(s):  
Specific Capacity ◽  
Rate Capability ◽  
Lithium Ion ◽  
Composite Cathode ◽  
X Ray Diffraction ◽  
X Ray ◽  
Electrochemical Tests ◽  
Capacity Loss ◽  
Lattice Doping ◽  
Scanning Electron

Li0.99Gd0.01FePO4/C composite was prepared by solid-state reaction, using particle modification with amorphous carbon from the decomposition of glucose and lattice doping with supervalent cation Gd3+. All samples were characterized by X-ray diffraction, scanning electron microscopy, multi-point Brunauer Emmett and Teller methods. The electrochemical tests show Li0.99Gd 0.01FePO4/C composite obtains the highest discharge specific capacity of 154 mAh.g-1 at C/10 rate and the best rate capability. Its specific capacity reaches 131 mAh.g-1 at 2 C rate. Its capacity loss is only 14.9 % when the rate varies from C/10 to 2 C.

Surface Modification of LiCo1/3Ni1/3Mn1/3O2 with LaF3 for Lithium-Ion Batteries

2011 ◽  
Vol 399-401 ◽  
pp. 1515-1518
Author(s):  
Zhan Xu Yang ◽  
Qing Dong Qiao
Keyword(s):  
Coating Layer ◽  
Specific Capacity ◽  
Lithium Ion ◽  
X Ray Diffraction ◽  
Galvanostatic Charge ◽  
X Ray ◽  
Discharge Specific Capacity ◽  
Initial Discharge ◽  
Surface Modified ◽  
Charge Discharge

LiCo1/3Ni1/3Mn1/3O2 has been modified with LaF3. The surface modified materials were characterized by X-ray diffraction (XRD), field emission scanning electron microscopy (FE-SEM) and galvanostatic charge-discharge cycling. The LaF3-coated LiCo1/3Ni1/3Mn1/3O2 had an initial discharge specific capacity of 178.0 mAh•g–1 within the potential ranges 2.75–4.5 V (vs. Li+/Li), and its discharge specific capacity is 168.7 mAh•g–1 after 50 cycles, much higher than that of the pristine LiCo1/3Ni1/3Mn1/3O2 (148.4 mAh•g–1). The improvement could be attributed to the LaF3 coating layer that hinders interaction between LiCo1/3Ni1/3Mn1/3O2 and electrolyte and stabilizes the structure of LiCo1/3Ni1/3Mn1/3O2 .

The Roman Ceramics of Salobrena (Granada-Spain) and their Raw Materials

1992 ◽  
Vol 267 ◽  
Author(s):  
Ana M De Andres ◽  
Isabel MuÑOZ
Keyword(s):  
Thermal Analysis ◽  
Differential Thermal Analysis ◽  
Raw Materials ◽  
Third Century ◽  
Western Coast ◽  
X Ray Diffraction ◽  
X Ray ◽  
The Third ◽  
Good Number ◽  
Scanning Electron

ABSTRACTNineteen roman ceramic sherds found near Salobreña (Granada, Spain), in the western coast of the Mediterranean Sea, as well as different ceramic clays from the surroundingsare studied. Both clays and ceramic sherds are characterizad by X-ray diffraction and spectrometry, differential thermal analysis, and scanning electron and optical microscopies. A good number of the ceramic pieces, among which some “Terrae Sigillatae”, have a composition similar to that of the local clays and, thus, have been probably manufactured at Salobreña. Only a few of them have a foreign origin. For most of them, the firing temperature was about 800-850 °C, although some have been produced at 900-1000 °C, and some others at 1000-1100 °C. It is concluded that Salobreña appearsto have been an important settlement just in the third century of the Christian era.

Influence of Fly Ash on Corrosion Resistance of Refractory Forsterite-Spinel Ceramics

2021 ◽  
Vol 325 ◽  
pp. 181-187
Author(s):  
Martin Nguyen ◽  
Radomír Sokolář
Keyword(s):  
Electron Microscopy ◽  
Scanning Electron Microscopy ◽  
Corrosion Resistance ◽  
Fly Ash ◽  
Raw Materials ◽  
X Ray Diffraction ◽  
X Ray ◽  
Transition Zones ◽  
Refractory Ceramics ◽  
Scanning Electron

This article examines the influence of fly ash on corrosion resistance of refractory forsterite-spinel ceramics by molten iron as a corrosive medium. Fly ash in comparison with alumina were used as raw materials and sources of aluminium oxide for synthesis of forsterite-spinel refractory ceramics. Raw materials were milled, mixed in different ratios into two sets of mixtures and sintered at 1550°C for 2 hours. Samples were characterized by X-ray diffraction analysis and thermal dilatometric analysis. Crucibles were then made from the fired ceramic mixtures and fired together with iron at its melting point of 1535°C for 5 hours. The corrosion resistance was evaluated by scanning electron microscopy on the transition zones between iron and ceramics. Mixtures with increased amount of spinel had higher corrosion resistance and mixtures with fly ash were comparable to mixtures with alumina in terms of corrosion resistance and refractory properties.

Preparation of the System of BaO-MgO-Al2O3-TiO2 Acid-Resistant Fracturing Proppants

2011 ◽  
Vol 399-401 ◽  
pp. 855-859
Author(s):  
Ting Ting Wu ◽  
Bo Lin Wu
Keyword(s):  
Sintering Temperature ◽  
Raw Materials ◽  
Acid Resistance ◽  
Pressureless Sintering ◽  
Alumina Matrix ◽  
X Ray Diffraction ◽  
X Ray ◽  
Acid Solubility ◽  
Resistance Performance ◽  
Scanning Electron

In order to improve the acid resistance and reduce the apparent density of fracturing proppants, TiO2 powder added in the system of BaO-MgO-Al2O3 fracturing proppants were prepared by the technique of pressureless sintering. The properties of the samples were investigated by the measurements of acid solubility, X-ray diffraction and scanning electron microscopy. The results show that the acid solubility of alumina matrix fracturing proppants contenting TiO2 of the 4wt% and BaO/MgO with the ratio of 3:7 is 0.15%. It is an important development in acid resistance performance of fracturing proppants research on laboratory. TiO2 is added to the raw materials and then calcine them to ceramics, which can reduces the sintering temperature, promote the densification and improve acid-resistant property of fracturing proppants.

Copper-based MOF, Cu3(SDBA)2(HSDBA), as catalyst for efficient reduction of 4-nitrophenol in the presence of sodium borohydride

2022 ◽  
Author(s):  
Manel Mansour ◽  
Hamza Kahri ◽  
Mouhieddinne Guergueb ◽  
Houcine Barhoumi ◽  
Enrique Gutierrez-Puebla ◽  
...  
Keyword(s):  
Electron Microscopy ◽  
Scanning Electron Microscopy ◽  
Physicochemical Properties ◽  
Sodium Borohydride ◽  
Solvothermal Method ◽  
X Ray Diffraction ◽  
X Ray ◽  
Prepared Sample ◽  
Efficient Reduction ◽  
Scanning Electron

Herein, we report the synthesis of the copper-based MOF, Cu3(SDBA)2(HSDBA), using solvothermal method. The physicochemical properties of the as-prepared sample were examined by X-ray diffraction, scanning electron microscopy, energy-dispersive X-ray...

The Effect of Alcoholic Reducing Agent on Morphology and Structure of VO2 (B) Nano-Particles

2011 ◽  
Vol 306-307 ◽  
pp. 1225-1228 ◽  
Author(s):  
Ji Qi ◽  
Chen Niu
Keyword(s):  
Cetyltrimethylammonium Bromide ◽  
Raw Materials ◽  
Thermal Reduction ◽  
Nano Particles ◽  
X Ray Diffraction ◽  
X Ray ◽  
Structure And Morphology ◽  
Morphology And Structure ◽  
Properties Of Materials ◽  
Scanning Electron

Vanadium dioxides (VO2) is synthesized by hydrothermal method. In this process,V2O5 powder is used as raw materials,cetyltrimethylammonium bromide (CTAB) is used as template and different alcohols such as methanol, ethanol, propanol and butanol are used as reductants. X-ray diffraction (XRD) and scanning electron microscopy (SEM) are used to test the properties of VO2 nanoparticles. The results show that VO2(B) nano-particles were succsessfully synthesized under the conditions of thermal reduction temperature 180°C, reaction time 24h and drying temperature 60°C. The variety of alcoholic reducing agents plays an important role in the structure and morphology of the product VO2(B), which relates closly to the electric properties of materials.

Synthesis and Photocatalytic Properties of Flower-Like ZnIn2S4 Microspheres by a Solvothermal Method

2014 ◽  
Vol 881-883 ◽  
pp. 1101-1104 ◽  
Author(s):  
Min Jie Zhou ◽  
Peng Cui
Keyword(s):  
Photocatalytic Activity ◽  
Electron Microscope ◽  
Scanning Electron Microscope ◽  
Diffuse Reflectance ◽  
Solvothermal Method ◽  
Diffuse Reflectance Spectroscopy ◽  
Reflectance Spectroscopy ◽  
X Ray Diffraction ◽  
X Ray ◽  
Scanning Electron

In this work, flower-like ZnIn2S4 microspheres were synthesized using a solvothermal method. The as-synthesized samples were characterized by X-ray diffraction (XRD), scanning electron microscope (SEM), and ultraviolet-visible diffuse reflectance spectroscopy (DRS) techniques. The photocatalytic activity of the ZnIn2S4 microspheres was investigated. The ZnIn2S4 microspheres exhibit much higher photocatalytic activity than pure P25 TiO2.

Influences of Fe2O3 Doping on the Crystallization of SiO2-Al2O3-MgO-K2O-ZrO2-F Glass-Ceramics

2009 ◽  
Vol 79-82 ◽  
pp. 1503-1506 ◽  
Author(s):  
Qing Bo Tian ◽  
Li Na Xu ◽  
Li Yang ◽  
Yan Sheng Yin
Keyword(s):  
Electron Microscopy ◽  
Scanning Electron Microscopy ◽  
Elevated Temperatures ◽  
Glass Ceramics ◽  
X Ray Diffraction ◽  
Crystallization Peak ◽  
X Ray ◽  
Microstructural Morphology ◽  
Microscopy Techniques ◽  
Scanning Electron

The influences of Fe2O3 doping on crystallization characteristics and microstructural morphology in the SiO2-Al2O3-MgO-K2O-ZrO2-F glass were investigated by using differential scanning calorimeter, X-ray diffraction and scanning electron microscopy techniques. The results indicate that the addtions of Fe2O3 shift the crystallization peaks to higher temperatures and the crystallization peaks increases in magnitude and the gap values between two crystallization peak temperatures boarden with the increment of Fe2O3 contents.The star-shaped crystals of cordietite by dendritic-manner growths are homogeneously precipitated in the rusidual glass. The mica phases, which are precipitated at interdendritic cordietite phases and formed the plate shapes at the elevated temperatures. The mica crystals grow at the expense of cordietite phases and finally form the composites of mica/cordietite uniformly distributed.

Sign in / Sign up

Export Citation Format

Share Document