scholarly journals Novel Composite Electrolytes of Zr0.92Y0.08O2-α(8YSZ)-Low Melting Point Glass Powder for Intermediate Temperature Solid Oxide Fuel Cells

Materials ◽  
2018 ◽  
Vol 11 (7) ◽  
pp. 1221 ◽  
Author(s):  
Hongtao Wang ◽  
Ruifeng Du ◽  
Ruijuan Shi ◽  
Junlong Liu
Keyword(s):  
Melting Point ◽  
Glass Powder ◽  
Sol Gel ◽  
Weight Ratio ◽  
Ratio Test ◽  
Composite Electrolytes ◽  
Glass Composite ◽  
Scanning Calorimetry ◽  
Composite Electrolyte ◽  
Ion Conductor

In this study, Zr0.92Y0.08O2-α(8YSZ) powders were synthesized by the sol-gel method. The chemical physics changes and phase formation temperature of 8YSZ crystal were determined by thermogravimetry analysis and differential scanning calorimetry (TGA-DSC). 8YSZ-low melting point glass powder (8YSZ-glass) composite electrolytes with various weight ratios were prepared and calcined at different temperatures. The X-ray diffraction (XRD) patterns of the composite electrolytes were tested. The effects of synthesis temperature, weight ratio, test temperature, and oxygen partial pressure on the conductivities of 8YSZ-glass composite electrolytes, were also investigated at 400–800 °C. The result of the logσ ~ log(pO2) plot indicates that the 8YSZ-20% glass (700 °C) is almost a pure ionic conductor. The oxygen concentration discharge cell illustrates that the 8YSZ-20% glass (700 °C) composite electrolyte is a good oxygen ion conductor.

The Variable Super-Capacitor with Nano-Diamond Film Electrode

2016 ◽  
Vol 852 ◽  
pp. 939-942 ◽  
Author(s):  
Xiu Xia Zhang ◽  
Jun Xia Wen ◽  
Rong Fan ◽  
Dao Jie Jiang ◽  
Xiu Li Lou ◽  
...  
Keyword(s):  
Melting Point ◽  
Thick Film ◽  
Glass Powder ◽  
Sol Gel ◽  
Film Electrode ◽  
Super Capacitor ◽  
Capacitor Plate ◽  
Good Thermal Stability ◽  
Low Dielectric ◽  
Insulation Thickness

nanoDiamond was mixed with ethylic cellulose and other Material to form to paste. A series of sol-gel nanoDiamond film with different proportions were designed test intentionally. nanoDiamond film was fabricated on Aluminum substrates using two-steps sintering process. The moving terminal of the variable super-capacitor was the shaft which throughout each of monolithic capacitor plate. The low melting point glass powder possesses giant permittivity, low dielectric loss, good thermal stability and dielectric constant in a wide temperature range which applied very broad prospects in microelectronics. The low melting point glass powder was mixed with carboxymethyl cellulose and deionized water to paste. The low melting point glass powder insulation thick-film was fixed on nanoDiamond film .In this paper, the insulation thick-film preparation: sintering at 578K to 588K and keeping 11.5 h to 12.5 h. A variable super-capacitor was designed based on nanoDiamond film electrode and low melting point glass powder insulation thick. Insulation thickness was prepared on uniform nanodiamond film to increase insulation super-capacitor between the two plates.

Characterization of LiClO4-SiO2 Composite Electrolyte Prepared by Modified Sol-Gel Method

2011 ◽  
Vol 415-417 ◽  
pp. 442-445 ◽  
Author(s):  
Hafizul Mat ◽  
Mohamed Nor Sabirin ◽  
Ri Hanum Yahaya Subban
Keyword(s):  
Room Temperature ◽  
Sol Gel ◽  
Composite Electrolytes ◽  
Composite Electrolyte ◽  
A Value ◽  
Dispersed System ◽  
Temperature Dependence Of Conductivity ◽  
Sol Gel Process ◽  
Heterogeneous Phase

(100-x) LiClO4-xSiO2(x is mol %) solid composite electrolytes in various compositions were synthesized by modified sol-gel process with sintering at 200 °C. The electrical and structural properties of the composites were investigated. The ionic conductivity of the composites increased with mol % of the dispersoid and then decreased. The highest conductivity was obtained for x = 50 mol % with a value of 4.06 × 10-7S cm-1at room temperature. The enhancement in conductivity was more than two orders of magnitude when compared to the host material. The higher conductivity in the SiO2dispersed system was interpreted in terms of space charge layer and percolation theory. The temperature dependence of conductivity of all samples were Arrhenian in nature and exhibited a maximum of 10-3S cm-1at T = 140 °C for x = 50 mol %. XRD spectra showed presence of heterogeneous phase of LiClO4-SiO2crystalline peaks.

Effect of the Rare Earth Oxide Impurities on the Physical and Thermal Properties of Ce0.9Gd0.1O0.195 (GDC) Composite Electrolyte IT-SOFC

2018 ◽  
Vol 929 ◽  
pp. 116-120
Author(s):  
Jarot Raharjo ◽  
Damisih ◽  
Masmui ◽  
Ade Utami Hapsari ◽  
Asep Riswoko ◽  
...  
Keyword(s):  
Thermal Properties ◽  
Rare Earth ◽  
Rare Earth Oxide ◽  
Gravimetric Analysis ◽  
Face Centered Cubic ◽  
Composite Electrolytes ◽  
Scanning Calorimetry ◽  
Composite Electrolyte ◽  
X Ray ◽  
Local Product

Observation on the effects of rare earth impurities on the properties of Ce0.9Gd0.1O0.195 (GDC) composite electrolyte has been performed. Indonesia has abundant rare earth elements especially CeO2, which one of the resources is from monazite mineral. In this study, the GDC powders were synthesized via solid state technique. The two types of precursors were prepared and mixed into planetary ballmill, i.e., CeO2 (Sigma Aldrich) with Gd2O3 (Sigma Aldrich) and CeO2 (non-commercial, local product) with Gd2O3 (Sigma Aldrich), namely GDC commercial and GDC non-commercial, respectively. The composite electrolyte powders calcined at temperature of 800°C in the air atmosphere condition. The composite electrolytes were then characterized in terms of its morphology, elemental, phase structure and thermal properties of the powders. The GDC commercial and non-commercial powders both consist of face centered cubic fluorite ceria structure which was confirmed by X-Ray Diffraction (XRD). The peaks are matching well with the cerium oxide JCPDS card No: 34-394. There are no peaks detected for the gadolinium oxide. It indicates that the dopant ion is fully substituted into the CeO2 lattice. The elemental analysis was performed using X-ray Fluorescence (XRF). The microstructures were observed under Scanning Electron Microscopy (SEM). The thermal properties characterizations were performed by using Thermal Gravimetric Analysis (TGA) and Differential Scanning Calorimetry (DSC) from room temperature to 1500°C. Both powders investigated are suitable for electrolyte IT-SOFC based on their physical and thermal characterization. Among the composite electrolytes investigated, the GDC commercial showed the better performance in terms of their physical and thermal properties.

scholarly journals Different approaches to obtain functionalized alumina as additive in polymer electrolyte membranes

2021 ◽  
Author(s):  
Lucia Mazzapioda ◽  
Mirko Sgambetterra ◽  
Akiko Tsurumaki ◽  
Maria Assunta Navarra
Keyword(s):  
Fuel Cell ◽  
Aluminum Oxide ◽  
Thermal Analyses ◽  
Sol Gel ◽  
X Ray Diffraction ◽  
Scanning Calorimetry ◽  
Composite Electrolyte ◽  
Fuel Cell Performance ◽  
Operation Temperature ◽  
Electrolyte Membranes

AbstractA series of sulfated aluminum oxides (S-Al2O3), investigated as an electrolyte additive in Nafion membranes, was synthesized via three different methods: (i) sol–gel sulfation starting from an aluminum alkoxide precursor, (ii) room temperature sulfation of fumed aluminum oxide, and (iii) hydrothermal sulfation of fumed aluminum oxide. Through the characterization of the synthesized S-Al2O3 by means of X-ray diffraction (XRD), thermogravimetric analysis (TGA), and infrared (IR) spectroscopy, a higher sulfation rate was found to be achieved via a hydrothermal sulfation, and the coordination state of sulfate groups was identified as monodentate. By using this hydrothermally synthesized S-Al2O3 as additive, a composite Nafion-based membrane was realized and compared to plain Nafion, by means of thermal analyses and fuel cell tests. Although higher hydration degree was found for the undoped membrane by differential scanning calorimetry (DSC), improved retention of fuel cell performance upon the increase of operation temperature was observed by using the composite electrolyte, confirming the stabilizing effect of the acidic inorganic additive.

scholarly journals Tailoring Mesoporous Titania Features by Ultrasound-Assisted Sol-Gel Technique: Effect of Surfactant/Titania Precursor Weight Ratio

Nanomaterials ◽  
2021 ◽  
Vol 11 (5) ◽  
pp. 1263
Author(s):  
Elvira Mahu ◽  
Cristina Giorgiana Coromelci ◽  
Doina Lutic ◽  
Iuliean Vasile Asaftei ◽  
Liviu Sacarescu ◽  
...  
Keyword(s):  
Photocatalytic Activity ◽  
Sol Gel ◽  
Weight Ratio ◽  
Soft Template ◽  
Synthesis Process ◽  
Mesoporous Titania ◽  
Cavitation Effect ◽  
Titania Precursor ◽  
Gel Technique ◽  
Ultrasound Assisted

A mesoporous titania structure has been prepared using the ultrasound-assisted sol-gel technique in order to find out a way to tailor its structure. The TiO2 obtained was compared to the same version of titania but synthesized by a conventional sol-gel method with the objective of understanding the effect of ultrasound in the synthesis process. All synthesis experiments were focused on the preparation of a titania photocatalyst. Thus, the anatase photocatalytic active phase of titania was proven by X-ray diffraction. Additionally, the ultrasonation treatment proved to increase the crystallinity of titania samples, being one of the requirements to having good photocatalytic activity for titania. The influence of surfactant/titania precursor weight ratio on the structural (XRD), textural (N2-sorption measurements), morphological (TEM), surface chemistry (FTIR) and optical properties (UVDR) was investigated. It was observed that the crystallite size, specific surface area, band gap energy and even photocatalytic activity was affected by the synergism occurring between cavitation effect and the surfactant/titania precursor weight ratio. The study yielded interesting great results that could be considered for further application of ultrasound to tailor mesoporous titania features via sol-gel soft template synthesis, against conventional sol-gel process.

scholarly journals Loading Effect of Sol-Gel Derived Barium Hexaferrite on Magnetic Polymer Composites

Nanomaterials ◽  
2021 ◽  
Vol 11 (3) ◽  
pp. 558
Author(s):  
Thanida Charoensuk ◽  
Wannisa Thongsamrit ◽  
Chesta Ruttanapun ◽  
Pongsakorn Jantaratana ◽  
Chitnarong Sirisathitkul
Keyword(s):  
Polymer Composites ◽  
Sol Gel ◽  
Weight Ratio ◽  
Barium Hexaferrite ◽  
Acrylonitrile Butadiene Styrene ◽  
Combustion Method ◽  
Casting Method ◽  
Auto Combustion ◽  
Solution Casting Method ◽  
Butadiene Styrene

Solution–processing methods were investigated as viable alternatives to produce the polymer-bonded barium hexaferrite (BaM). BaM powders were first synthesized by using the sol-gel auto-combustion method. While the ignition period in two synthesis batches varied, the morphology of hexagonal microplates and nanorods, as well as magnetic properties, were reproduced. To prepare magnetic polymer composites, these BaM powders were then incorporated into the acrylonitrile-butadiene-styrene (ABS) matrix with a weight ratio of 80:20, 70:30, and 60:40 by using the solution casting method. Magnetizations were linearly decreased with a reduction in ferrite loading. Compared to the BaM loose powders and pressed pellet, both remanent and saturation magnetizations were lower and gave rise to comparable values of the squareness. The squareness around 0.5 of BaM samples and their composites revealed the isotropic alignment. Interestingly, the coercivity was significantly increased from 1727–1776 Oe in loose BaM powders to 1874–2052 Oe for the BaM-ABS composites. These composites have potential to be implemented in the additive manufacturing of rare-earth-free magnets.

GDC - Y 2 O 3 Oxide Based Two Phase Nanocomposite Electrolyte

2011 ◽  
Vol 8 (4) ◽  
Author(s):  
Rizwan Raza ◽  
Ghazanfar Abbas ◽  
S. Khalid Imran ◽  
Imran Patel ◽  
Bin Zhu
Keyword(s):  
Fuel Cell ◽  
Ionic Conductivities ◽  
Morphological Properties ◽  
Scanning Calorimetry ◽  
Two Phase ◽  
Composite Electrolyte ◽  
Significant Performance ◽  
Advanced Fuel ◽  
Nanocomposite Electrolyte ◽  
Scherrer Formula

Oxide based two phase composite electrolyte (Ce0.9Gd0.1O2–Y2O3) was synthesized by coprecipitation method. The nanocomposite electrolyte showed the significant performance of power density 785 mW cm−2 and higher conductivities at relatively low temperature 550°C. Ionic conductivities were measured with ac impedance spectroscopy and four-probe dc method. The structural and morphological properties of the prepared electrolyte were investigated by scanning electron microscope (SEM). The thermal stability was determined with differential scanning calorimetry. The particle size that was calculated with Scherrer formula, 15–20 nm, is in a good agreement with the SEM and X- ray diffraction results. The purpose of this study is to introduce the functional nanocomposite materials for advanced fuel cell technology to meet the challenges of solid oxide fuel cell.

scholarly journals Physicochemical and Antifungal Properties of Clotrimazole in Combination with High-Molecular Weight Chitosan as a Multifunctional Excipient

Marine Drugs ◽  
2020 ◽  
Vol 18 (12) ◽  
pp. 591
Author(s):  
Bożena Grimling ◽  
Bożena Karolewicz ◽  
Urszula Nawrot ◽  
Katarzyna Włodarczyk ◽  
Agata Górniak
Keyword(s):  
Molecular Weight ◽  
High Molecular Weight ◽  
Weight Ratio ◽  
Scanning Calorimetry ◽  
Minimal Inhibitory Concentrations ◽  
Dissolution Tests ◽  
Effective Combination ◽  
The Impact ◽  
High Molecular Weight Chitosan

Chitosans represent a group of multifunctional drug excipients. Here, we aimed to estimate the impact of high-molecular weight chitosan on the physicochemical properties of clotrimazole–chitosan solid mixtures (CL–CH), prepared by grinding and kneading methods. We characterised these formulas by infrared spectroscopy, differential scanning calorimetry, and powder X-ray diffractometry, and performed in vitro clotrimazole dissolution tests. Additionally, we examined the antifungal activity of clotrimazole–chitosan mixtures against clinical Candida isolates under neutral and acid conditions. The synergistic effect of clotrimazole and chitosan S combinations was observed in tests carried out at pH 4 on Candida glabrata strains. The inhibition of C. glabrata growth reached at least 90%, regardless of the drug/excipient weight ratio, and even at half of the minimal inhibitory concentrations of clotrimazole. Our results demonstrate that clotrimazole and high-molecular weight chitosan could be an effective combination in a topical antifungal formulation, as chitosan acts synergistically with clotrimazole against non-albicans candida strains.

Sign in / Sign up

Export Citation Format

Share Document