scholarly journals Synthesis and Electrochemical Performance of LiMnPO4by Hydrothermal Method

2014 ◽  
Vol 2014 ◽  
pp. 1-9 ◽  
Author(s):  
Daichi Fujimoto ◽  
Yu Lei ◽  
Zheng-Hong Huang ◽  
Feiyu Kang ◽  
Junichi Kawamura
Keyword(s):  
Hydrothermal Method ◽  
Single Phase ◽  
Hydrothermal Reaction ◽  
Specific Capacity ◽  
Manganese Acetate ◽  
Acetate Tetrahydrate ◽  
Reaction Parameters ◽  
Promising Candidate ◽  
Hydrothermal Temperature ◽  
P Sources

LiMnPO4with olivinestructure which is the promising candidate for high voltage cathode material was synthesized by hydrothermal method. In order to synthesize high purity and well-defined LiMnPO4, several precursors for Li, Mn, and P sources and hydrothermal reaction parameters including temperature and [H2O]/[Mn] value are optimized. By analyzing the structure, Mn valence, morphology, and chemical ratio via XRD, XPS, Raman, SEM, and ICP LiMnPO4synthesized from manganese acetate tetrahydrate have single phase of LiMnPO4without impurity and showed charge and discharge reaction caused by Mn2+/Mn3+redox. Specific capacity of synthesized LiMnPO4grew up during cycling. Moreover, when hydrothermal temperature was set at 150°C and [H2O]/[Mn] value was set at 15, discharge capacity as high as 70 mAh/g was obtained at1/20  Crate.

Fabrication of Nano Zeolite P from Coal Fly Ash by Combining Alkaline — Fusion and Hydrothermal Reactions

2013 ◽  
Vol 591 ◽  
pp. 126-129 ◽  
Author(s):  
Yong Zai Wang ◽  
Le Wang ◽  
Hong Ming Xu ◽  
Shao Hui Luo
Keyword(s):  
Fly Ash ◽  
Single Phase ◽  
Hydrothermal Reaction ◽  
Coal Fly Ash ◽  
Reaction Products ◽  
Hydrothermal Temperature ◽  
Hydrothermal Reactions ◽  
Alkaline Fusion ◽  
Crystallite Sizes ◽  
Zeolite P

Well-crystallised nanozeolite P has been synthesized from coal fly ash by combined method of alkaline-fusion and hydrothermal reactions. The influence of preparation parameters, such as the proportion of fly ash/NaOH, the hydrothermal reaction temperature and time on the reaction products were investigated by XRD and FESEM. Results indicated that, the optimum conditions for fabrication of a single phase of zeolite P were the mass ratio of fly ash/ NaOH =1/1, fusion temperature at 550°C and hydrothermal temperature at 100°C for 48h .The average crystallite sizes of the zeolite samples are 29.4nm. The obtained products show crystal morphology heterogeneity comprised by various euhedral forms.

Titanium Dioxide Doped with Nitrogen Nanopowder Prepared by Hydrothermal Method

2018 ◽  
Vol 283 ◽  
pp. 167-172
Author(s):  
Pusit Pookmanee ◽  
Khemmika Promwanna ◽  
Kanjanaporn Narong ◽  
Chanchana Thanachayanont ◽  
Chabaiporn Junin ◽  
...  
Keyword(s):  
Titanium Dioxide ◽  
Hydrothermal Method ◽  
Single Phase ◽  
Functional Group ◽  
Hydrothermal Reaction ◽  
Titanium Isopropoxide ◽  
Infrared Spectrophotometry ◽  
X Ray Diffraction ◽  
X Ray ◽  
Nitrogen Doped Titanium Dioxide

Nitrogen-doped titanium dioxide (N-doped TiO2) nanopowder was successfully prepared by the hydrothermal method. Titanium isopropoxide and urea were used as the starting precursors. The hydrothermal reaction was controlled at 200 °C for 2, 4 and 6 h. The white powder was obtained and dried for 24h. The crystal structure was identified by X-ray diffraction (XRD). A single phase of anatase structure was obtained without calcination steps. The morphology was investigated by field emission scanning electron microscopy (FESEM). The particles were irregular in shape and highly agglomerated. The chemical composition was determined by energy dispersive X-ray spectrometry (EDXS). The characteristic X-ray energy of titanium (Kα = 4.51 keV and Kβ = 4.93 keV), oxygen (Kα = 0.52 keV) and nitrogen (Kα = 0.39 keV) were observed. The functional group was identified by Fourier transform infrared spectrophotometry (FTIR). The wavenumbers in the range 668 to 1389 cm-1 corresponded to vibrations of Ti–O–Ti bond. The wavenumber in the range of 1442 to 1500 cm-1 could be attributed to the nitrogen species in the TiO2 network.

scholarly journals Enhanced electromagnetic wave absorption property of binary ZnO/NiCo2O4 composites

2021 ◽  
Author(s):  
Bin Du ◽  
Mei Cai ◽  
Xuan Wang ◽  
Junjie Qian ◽  
Chao He ◽  
...  
Keyword(s):  
Electromagnetic Wave ◽  
Dielectric Properties ◽  
Hydrothermal Reaction ◽  
Absorption Property ◽  
Absorption Properties ◽  
Promising Candidate ◽  
Electromagnetic Wave Absorption ◽  
Wave Absorption ◽  
Absorbing Materials ◽  
Minimum Reflection Loss

AbstractNowadays, metal oxide-based electromagnetic wave absorbing materials have aroused widely attentions in the application of telecommunication and electronics due to their selectable mechanical and outstanding dielectric properties. Herein, the binary ZnO/NiCo2O4 nanoparticles were successfully synthesized via hydrothermal reaction and the electromagnetic wave absorption properties of the composites were investigated in detail. As a result, benefiting from the dielectric loss, the as-obtained ZnO/NiCo2O4-7 samples possessed a minimum reflection loss value of −33.49 dB at 18.0 GHz with the thickness of 4.99 mm. This work indicates that ZnO/NiCo2O4 composites have the promising candidate applications in electromagnetic wave absorption materials in the future.

Preparation of NiO Microspheres by Hydrothermal Method and its Electrochemical Capacitive Properties

2015 ◽  
Vol 814 ◽  
pp. 81-85 ◽  
Author(s):  
Qian Qian Li ◽  
Run Hua Fan ◽  
Ke Lan Yan ◽  
Kai Sun ◽  
Xu Ai Wang ◽  
...  
Keyword(s):  
Hydrothermal Method ◽  
Electrochemical Impedance ◽  
Specific Capacity ◽  
Rate Capability ◽  
Average Diameter ◽  
Three Dimensions ◽  
Electrochemical Characteristics ◽  
X Ray Diffraction ◽  
High Specific Capacity ◽  
Capacitive Properties

The precursor Ni (OH)2 was synthesized by a simple hydrothermal method with hexamethylenetetramine ((CH2)6N4) as precipitant and template, and then NiO was gained after calcination. The phase and morphology of the synthesized product were characterized by X-ray diffraction (XRD) and scanning electron microscope (SEM), and the electrochemical capacitive characterization was performed using cyclic voltammetry (CV), chronopotentiometry and electrochemical impedance spectroscopy (EIS) in a 6mol/L KOH aqueous solution electrolyte. The result shows that spherical NiO without impurity was synthesized, the average diameter of the spheres is 5 um and these spheres were constructed by the interactive arrangement of many nanoflakes in three dimensions. This kind of NiO shows the typical electrochemical characteristics of pseudo capacitance with high specific capacity and excellent rate capability. The specific capacity can reach 515F/g at the current density of 1A/g

Synthesis and Properties of (Bi0.5Na0.5)TiO3 Powders by Hydrothermal Method

2007 ◽  
Vol 336-338 ◽  
pp. 140-142
Author(s):  
Jun Jie Hao ◽  
Xiao Hui Wang ◽  
Shi Yun Lin ◽  
Long Tu Li
Keyword(s):  
Particle Size ◽  
Hydrothermal Method ◽  
Single Phase ◽  
Piezoelectric Ceramics ◽  
Treatment Temperature ◽  
Lead Free ◽  
Excellent Candidate ◽  
Traditionally Prepared ◽  
Particle Size And Morphology ◽  
Size And Morphology

Na0.5Bi0.5TiO3 (NBT) is considered to be an excellent candidate for lead-free piezoelectric ceramics. In this study, we propose a hydrothermal method for the preparation of single phase NBT powder at relatively low treatment-temperature. The particle size and morphology of the synthesized powders were examined by SEM. The powders were further pressed into disk and sintered at 1120°C/2h in air, and its properties and microstructure were compared with traditionally prepared samples.

Fabrication and Characterization of SiO2/TiO2 Nano-Hybrid Particles

2017 ◽  
Vol 727 ◽  
pp. 335-342
Author(s):  
Xiao Fei Qu ◽  
Dan Dan Xie ◽  
Yu Fei Wang ◽  
Kai Wang
Keyword(s):  
Silicon Dioxide ◽  
Hydrothermal Method ◽  
Hydrothermal Time ◽  
Hybrid Particles ◽  
Titanium Tetrafluoride ◽  
Hydrothermal Temperature ◽  
Structures And Properties ◽  
Bet Analysis ◽  
Fabrication And Characterization

SiO2/TiO2 nano-hybrid particles were successfully prepared by hydrothermal method by using titanium tetrafluoride (TiF4) as the titanium source, silicon dioxide as template. The factors of hydrothermal temperature and hydrothermal time on the morphologies and photocatalytic activity of SiO2/TiO2 nano-spheres were systematically discussed in this paper. The structures and properties of the SiO2/TiO2 nano-hybrid particles were studied by some techniques such as SEM, TEM, XRD and BET analysis. The results indicated that TiO2 prepared by hydrothermal method were anatase crystal, and in the form of polycrystalline. The formation mechanism of SiO2/TiO2 nano-hybrid particles was also discussed.

scholarly journals Investigation of Bioactive Glass-Ceramic 60SiO2-30CaO-10P2O5 Prepared by Hydrothermal Method

2019 ◽  
Vol 2019 ◽  
pp. 1-8
Author(s):  
Vuong Xuan Bui ◽  
Mai Quang Vo ◽  
Tien Anh Nguyen ◽  
Hoa Thi Bui
Keyword(s):  
Bioactive Glass ◽  
Hydrothermal Method ◽  
Reaction Temperature ◽  
Hydrothermal Reaction ◽  
Glass Ceramics ◽  
Degree Of Crystallinity ◽  
Apatite Phase ◽  
Powder Samples ◽  
Sbf Solution ◽  
The Degree Of Crystallinity

Bioactive glass-ceramics (BGCs) with the composition of 60SiO2-30CaO-10P2O5 (wt. %) have been synthesized by the hydrothermal method. The BGC samples were prepared at two reaction temperatures of 150 and 220°C, named BGC-150 and BGC-220. The XRD and FTIR analyses highlighted that the degree of crystallinity of BGCs increased linearly with hydrothermal reaction temperature. FE-SEM and TEM results indicated that the surface of BGC samples is covered by the nanosized particles which grow into larger sizes as a function of reaction temperature. The bioactivity of BGCs was investigated by the immersion of powder samples in the SBF solution. The results confirmed the dissolution and the interaction of BGC samples in the SBF solution which led to the formation of a new apatite phase on their surface.

Effect of High Loading Glycine on Fe2O3 Nano Oval as Anode for Lithium-Ion Battery

2019 ◽  
Vol 964 ◽  
pp. 215-220
Author(s):  
Lukman Noerochim ◽  
Agny Muchamad Reza ◽  
Budi Agung
Keyword(s):  
Lithium Ion Battery ◽  
Discharge Capacity ◽  
Lithium Ion ◽  
Nyquist Plot ◽  
Discharge Process ◽  
Promising Candidate ◽  
Hydrothermal Temperature ◽  
Specific Discharge ◽  
Li Ion ◽  
Charge Discharge

In this work, Fe2O3 nanooval is successfully synthesized with variation of glycine composition of 9, 12, and 15 mmol at hydrothermal temperature of 160 °C. The Fe2O3 nanooval is indexed by XRD as α-Fe2O3. SEM and TEM images show that the 12 mmol of glycine has the largest diameter with the perfect nanooval form. Nyquist plot shows that the 12 mmol of glycine sample has the best conductivity value of 8.26x10-5 S/m. The CV of sample 12 mmol delivers the best intercalate/de-intercalate with ΔV of 0.82 V. The 12 mmol sample shows the largest specific discharge capacity of 631.62 mAh/g. It is attributed to high conductivity and high kinetics reaction of Li ion during charge-discharge process. Therefore, Fe2O3 nanooval is a promising candidate as anode for lithium-ion battery.

Investigation of the effect of reaction parameters on the microwave-assisted hydrothermal synthesis of hierarchical jasmine-flower-like ZnO nanostructures for dye-sensitized solar cells

2016 ◽  
Vol 40 (6) ◽  
pp. 5080-5089 ◽  
Author(s):  
Ramachandran Krishnapriya ◽  
Selvarasu Praneetha ◽  
Arumugam Vadivel Murugan
Keyword(s):  
Solar Cells ◽  
Hydrothermal Reaction ◽  
Photovoltaic Performance ◽  
Dye Sensitized Solar Cells ◽  
Zno Nanostructures ◽  
Reaction Parameters ◽  
Dye Sensitized ◽  
Microwave Assisted ◽  
Microwave Hydrothermal ◽  
Sensitized Solar Cells

The influence of the microwave-hydrothermal reaction parameters upon the photovoltaic performance of fabricated jasmine-flower-like ZnO-based dye-sensitized solar cells was investigated.

scholarly journals High-performance monoliths in heterogeneous catalysis with single-phase liquid flow

2017 ◽  
Vol 2 (4) ◽  
pp. 498-511 ◽  
Author(s):  
Christian P. Haas ◽  
Tibor Müllner ◽  
Richard Kohns ◽  
Dirk Enke ◽  
Ulrich Tallarek
Keyword(s):  
Heterogeneous Catalysis ◽  
Liquid Flow ◽  
Continuous Flow ◽  
High Performance ◽  
Single Phase ◽  
Rapid Screening ◽  
Flow Mode ◽  
Reaction Parameters ◽  
On Line ◽  
Phase Liquid

On-line control and monitoring in heterogeneous catalysis utilizing high-performance supports allows rapid screening of intrinsic reaction parameters in continuous-flow mode.

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