scholarly journals Electrochemical Properties of Ce0.5Sr0.5 (Co0.8Fe0.2)1−xZrxO3−δ Cathode Materials for Low Intermediate Temperature Solid Oxide Fuel Cells (LIT-SOFCs) Synthesized by Sol-Gel Method

2021 ◽  
Vol 2021 ◽  
pp. 1-8
Author(s):  
Beyene Tesfaw Ayalew ◽  
P. Vijay Bhaskar Rao
Keyword(s):  
Electrochemical Properties ◽  
Perovskite Phase ◽  
Sol Gel ◽  
Electronic Conductivity ◽  
Partial Substitution ◽  
Sem Images ◽  
Gel Method ◽  
Sol Gel Method ◽  
Crystallite Sizes ◽  
Xrd Patterns

Ce0.5Sr0.5 (Co0.8Fe0.2)1−x ZrxO3−δ (CSCFZ) powders were synthesized by the sol-gel method and characterized to study structural and electrochemical properties. X-ray diffractometer (XRD) patterns of all samples give nanosized particles of a high-degree crystalline cathode having a cubic-type perovskite structure of space group Pm-3m with the existence of oxygen vacancies in the lattices. The results have the perovskite phase with average crystallite sizes of 26.57 nm, 18.14 nm, 18.13 nm, and 18.12 nm with porosities of 9.93%, 9.87%, 9.50%, and 9.08% for x = 0, 0.1, 0.15, and 0.2, respectively. Scanning electron microscope (SEM) micrographs showed the presence of pores on the microstructure. Average grain sizes of prepared samples found from SEM images were in the range of 105.30–183.02 nm. The partial substitution of zirconium at the B-site shows more stable materials than the host without decreasing the porosity that much. The results of electronic conductivity analyzed by the four-probe dc technique show that the conductivity of synthesized materials increases with the increment of both dopant concentration and temperature by the decrement of area specific resistances. The electrical conductivity of CSCFZ steadily increased with the increment of temperature which reached 42.76 Scm−1 at around 450°C.

Influence of Calcination Temperature on Synthesis of Magnetite (Fe3O4) Nanoparticles by Sol-Gel Method

2014 ◽  
Vol 979 ◽  
pp. 208-211 ◽  
Author(s):  
Apichaya Worawong ◽  
Tula Jutarosaga ◽  
Wandee Onreabroy
Keyword(s):  
Magnetic Nanoparticles ◽  
Calcination Temperature ◽  
Sol Gel ◽  
Ferric Nitrate ◽  
Particle Sizes ◽  
Sem Images ◽  
Gel Method ◽  
Sol Gel Method ◽  
Size And Morphology ◽  
Xrd Patterns

Magnetite (Fe3O4) nanoparticles were successfully synthesized by the sol-gel method from ferric nitrate-EG (EG=ethylene glycol) gel. The precursors were calcined in argon under an atmospheric pressure at the temperatures varied from 400°C to 500°C. The synthesized magnetic nanoparticles were characterized by X-ray diffractrometer (XRD), field emission scanning electron microscope (FE-SEM) and vibrating sample magnetometer (VSM). The XRD patterns of powder calcined temperature at 400๐C showed clearer Fe3O4phase than those calcined at other temperatures. The particle size and morphology of magnetic nanoparticles were studied using FE-SEM. The FE-SEM images showed that the particle sizes varied from 30-108 nm. The particle sizes increased with the increase of calcination temperature. VSM measurements indicated that the Fe3O4nanoparticles were soft ferrite with the maximum magnetization (Mm) and coercivity (Hc) of 35 emu/g and 17 Oe, respectively.

scholarly journals Synthesis, characterization and in vitro cytotoxicity study of Co and Ni ferrite nanoparticles prepared by sol-gel method

2021 ◽  
Vol 3 (7) ◽  
Author(s):  
Alexandre Pancotti ◽  
Dener Pereira Santos ◽  
Dielly Oliveira Morais ◽  
Mauro Vinícius de Barros Souza ◽  
Débora R. Lima ◽  
...  
Keyword(s):  
Photoelectron Spectroscopy ◽  
Sol Gel ◽  
Test Sample ◽  
In Vitro Cytotoxicity ◽  
Gel Method ◽  
X Ray ◽  
Sol Gel Method ◽  
Transmission Electron ◽  
Crystallite Sizes

AbstractIn this study, we report the synthesis and characterization of NiFe2O4 and CoFe2O4 nanoparticles (NPs) which are widely used in the biomedical area. There is still limited knowledge how the properties of these materials are influenced by different chemical routes. In this work, we investigated the effect of heat treatment over cytotoxicity of cobalt and niquel ferrites NPs synthesized by sol-gel method. Then the samples were studied using transmission electron microscopy (TEM), X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS), vibrating sample magnetometer (VSM), Fourier Transform Infrared Spectroscopy Analysis (FTIR), and X-ray fluorescence (XRF). The average crystallite sizes of the particles were found to be in the range of 20–35 nm. The hemocompatibility (erythrocytes and leukocytes) was checked. Cytotoxicity results were similar to those of the control test sample, therefore suggesting hemocompatibility of the tested materials.

Effect of Synthesis Conditions on the Structure and Electrochemical Properties of LiNi1/2Mn1/2O2 by Sol Gel Method

2011 ◽  
Vol 399-401 ◽  
pp. 1447-1450
Author(s):  
Zhi Yong Yu ◽  
Han Xing Liu
Keyword(s):  
Electrochemical Properties ◽  
Sol Gel ◽  
Electrochemical Analysis ◽  
X Ray Diffraction ◽  
Capacity Fading ◽  
Gel Method ◽  
X Ray ◽  
Sol Gel Method ◽  
Synthesis Conditions ◽  
A Current

The layered LiNi1/2Mn1/2O2 cathode materials were synthesized by a sol gel method. The effects of calcination temperature and time on the structural and electrochemical properties of the LiNi1/2Mn1/2O2 were investigated. The prepared samples were characterized by X-ray diffraction (XRD) and electrochemical analysis. The results revealed that the layered LiNi1/2Mn1/2O2 material could be optimal synthesized at temperature of 900°C for 10h. The sample prepared under the above conditions has the highest initial discharge capacity of 151 mAh/g and showed no dramatic capacity fading during 20 cycles between 2.5-4.5V at a current rate of 20mA/g.

Enhancement of electrochemical properties of niobium-doped LiFePO4 /C synthesized by sol-gel method

2018 ◽  
Vol 65 (8) ◽  
pp. 977-981 ◽  
Author(s):  
Ao Jiang ◽  
Xinlu Wang ◽  
Musen Gao ◽  
Jinxian Wang ◽  
Guixia Liu ◽  
...  
Keyword(s):  
Electrochemical Properties ◽  
Sol Gel ◽  
Gel Method ◽  
Sol Gel Method ◽  
Niobium Doped

Improved electrochemical properties of (1 − x)LiFePO4·xLi3V2(PO4)3/C composites prepared by a novel sol–gel method

2015 ◽  
Vol 39 (11) ◽  
pp. 8971-8977 ◽  
Author(s):  
Yuanchang Si ◽  
Zhi Su ◽  
Yingbo Wang ◽  
Ting Ma ◽  
Juan Ding
Keyword(s):  
Electrochemical Properties ◽  
Discharge Capacity ◽  
Sol Gel ◽  
Initial Discharge Capacity ◽  
Gel Method ◽  
Sol Gel Method ◽  
Initial Discharge

0.8LiFePO4·0.2Li3V2(PO4)3/C composites were synthesized by a new sol–gel method, which delivered an initial discharge capacity of 158.7 mA h g−1 at 0.1C.

Study of Nanocrystalline ZnAl2O4 and ZnFe2O4 with SiO2 on Structural and Optical Properties Synthesized by Sol-Gel Method

2015 ◽  
Vol 1119 ◽  
pp. 96-100
Author(s):  
Mohd Syafiq Zulfakar ◽  
Huda Abdullah ◽  
Wan Nasarudin Wan Jalal ◽  
Zalita Zainuddin ◽  
Sahbudin Shaari
Keyword(s):  
Optical Properties ◽  
Spinel Structure ◽  
Dielectric Material ◽  
Sol Gel ◽  
Zinc Aluminate ◽  
Gel Method ◽  
Sol Gel Method ◽  
Tauc Plot ◽  
Crystallite Sizes ◽  
Spinel Structures

Zinc aluminate (ZnAl2O4) and zinc ferrite (ZnFe2O4) nanocrystalline structures dispersed into SiO2 matrix were prepared by sol-gel method. Phase formation of ZnAl2O4 and ZnFe2O4 was confirmed by X-ray diffraction (XRD) analysis. The crystallite sizes was determine using Scherer’s equation from the broadening of dominant peak at (311) plane. It was found the crystallite size of both compound decreased due to the decrement compositions of Zn2+ ion and Al3+ / Fe3+ ions. The crystallite sizes for ZnAl2O4 and ZnFe2O4 was calculated to be around ~ 14.16 – 11.27 nm and ~ 11.27 – 4.72 nm, respectively. FTIR analysis was done to determine the formation of spinel structures. FTIR results analysis confirmed that the formation of spinel structure where it has been observed that the bands around 800 cm-1 was associated to the vibrations of aluminum-oxygen and metal-oxygen-aluminum bonds. This characteristic was identified to the formation of zinc aluminate spinel structure. The optical properties have been done to determine the energy bandgap of ZnAl2O4 and ZnFe2O4 samples. The Uv-Visible absorption spectra have been done within wavelength 300 – 800 nm and the graph was plotted into the Tauc plot. This new dielectric material was purposed to improve the value of dielectric permittivity with addition of SiO2 where it can be applied as microwave dielectric material without changing the original spinel structures.

scholarly journals Growth and Characterization of CuO Nanostructures on Si for the Fabrication of CuO/p-Si Schottky Diodes

2013 ◽  
Vol 2013 ◽  
pp. 1-6 ◽  
Author(s):  
S. Çetinkaya ◽  
H. A. Çetinkara ◽  
F. Bayansal ◽  
S. Kahraman
Keyword(s):  
Schottky Diodes ◽  
Sol Gel ◽  
Sem Images ◽  
Gel Method ◽  
Sol Gel Method ◽  
Current Voltage ◽  
Current Voltage Characteristics ◽  
Cbd Method ◽  
Xrd Techniques

CuO interlayers in the CuO/p-Si Schottky diodes were fabricated by using CBD and sol-gel methods. Deposited CuO layers were characterized by SEM and XRD techniques. From the SEM images, it was seen that the film grown by CBD method is denser than the film grown by sol-gel method. This result is compatible with XRD results which show that the crystallization in CBD method is higher than it is in sol-gel method. For the electrical investigations, current-voltage characteristics of the diodes have been studied at room temperature. ConventionalI-Vand Norde’s methods were used in order to determine the ideality factor, barrier height, and series resistance values. It was seen that the morphological and structural analysis are compatible with the results of electrical investigations.

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