Effect of Pre-sintering Treatment of Anode Substrate on the Densification and Flatness of YSZ Electrolyte by Suspension Spray

2019 ◽  
Vol 25 (2) ◽  
pp. 543-551 ◽  
Author(s):  
Lei Zhang ◽  
Shangquan Zhang ◽  
Lei Bi ◽  
Bin Xie ◽  
Wei Liu ◽  
...  
Keyword(s):  
Anode Substrate ◽  
Ysz Electrolyte

NiO+YSZ anode substrate for screen-printing fabrication of YSZ electrolyte film in solid oxide fuel cell

2009 ◽  
Vol 70 (1) ◽  
pp. 164-168 ◽  
Author(s):  
Weiwei Sun ◽  
Xiqiang Huang ◽  
Zhe Lü ◽  
Lijun Zhao ◽  
Bo Wei ◽  
...  
Keyword(s):  
Fuel Cell ◽  
Solid Oxide Fuel Cell ◽  
Screen Printing ◽  
Solid Oxide ◽  
Oxide Fuel ◽  
Electrolyte Film ◽  
Anode Substrate ◽  
Ysz Electrolyte

The Hydrothermal Synthesis of Nano-YSZ Crystallite and the Preparation of YSZ Electrolyte Film for SOFC

2011 ◽  
Vol 228-229 ◽  
pp. 288-292 ◽  
Author(s):  
Bao An Fan
Keyword(s):  
Pore Diameter ◽  
Dip Coating ◽  
Diameter Distribution ◽  
Cubic Phase ◽  
Electrolyte Film ◽  
Anode Substrate ◽  
Ysz Electrolyte ◽  
Dip Coating Technique ◽  
First Time ◽  
Scanning Electron

The nanometer YSZ can be synthesized by a hydrothermal method. The experimental results of XRD, BET and TEM showed that the hydrothermal powder is pure cubic phase of Y2O3 stabilized ZrO2 with the crystallite size less than 10nm. Using the slurry directly, the YSZ film can be deposited on anode substrate by a dip-coating technique. The Field Emission Scanning Electron Microscope photographs approved that the film has been densified after sintered at 950°C for 5h. The pore diameter distribution experiment confirmed that there not exist aggregates in green film. The nanometer sized crystallite and no aggregates existence endow the YSZ green film with excellent sintering ability. Consequently, the YSZ film can be sintered below 1000°C for the first time.

Effect of Laser-derived Surface Re-melting of YSZ Electrolyte on Performance of Solid Oxide Fuel Cells

2019 ◽  
Vol 6 (2) ◽  
pp. 235-239 ◽  
Author(s):  
Hong Yi Kenneth Tan ◽  
Jong Dae Baek ◽  
Chen-Nan Sun ◽  
Jun Wei ◽  
Seong Hyuk Lee ◽  
...  
Keyword(s):  
Fuel Cells ◽  
Solid Oxide Fuel Cells ◽  
Solid Oxide ◽  
Oxide Fuel ◽  
Ysz Electrolyte

Ni–YSZ-supported tubular solid oxide fuel cells with GDC interlayer between YSZ electrolyte and LSCF cathode

2014 ◽  
Vol 39 (24) ◽  
pp. 12894-12903 ◽  
Author(s):  
Seung-Young Park ◽  
Jee Hyun Ahn ◽  
Chang-Woo Jeong ◽  
Chan Woong Na ◽  
Rak-Hyun Song ◽  
...  
Keyword(s):  
Fuel Cells ◽  
Solid Oxide Fuel Cells ◽  
Solid Oxide ◽  
Oxide Fuel ◽  
Ysz Electrolyte

Oxygen Exchange on a Highly Oriented Thin Film Electrode

2000 ◽  
Vol 654 ◽  
Author(s):  
Y. L. Yang ◽  
C. L. Chen ◽  
G. P. Luo ◽  
C. W. Chu ◽  
A. J. Jacobson
Keyword(s):  
Thin Film ◽  
Ionic Conduction ◽  
Equivalent Circuit Model ◽  
Oxygen Exchange ◽  
Impedance Method ◽  
Film Electrode ◽  
Thin Film Electrode ◽  
Ionic Transfer ◽  
Bias Potential ◽  
Ysz Electrolyte

AbstractThe cathodic kinetic processes on a highly oriented LSCO thin film electrode supported on YSZ(100) surface were studied with a 3-probe ac impedance method under varying bias potential and annealing temperatures. Three distinctive features observed in the impedance spectra were assigned to contributions from the ionic conduction of the YSZ electrolyte, the ionic transfer at the LSCO/YSZ interface, and the oxygen exchange on the LSCO electrode surface. The changes of the three features with respect to the annealing history and bias potential were measured. The impedance data were analyzed using an equivalent circuit model: (RelCel)(RinterfaceQinterface)(RsurfCsurf).

Development of Fabrication Processes for Tubular Solid Oxide Fuel Cell (SOFC) by Plasma Spraying

1998 ◽  
Author(s):  
W.T. Ju ◽  
S.H. Hong
Keyword(s):  
Fuel Cell ◽  
Solid Oxide Fuel Cell ◽  
Plasma Spray ◽  
Cell Structure ◽  
Atmospheric Pressure Plasma ◽  
Solid Oxide ◽  
Oxide Fuel ◽  
Air Electrode ◽  
Ceramic Electrolyte ◽  
Ysz Electrolyte

Abstract The atmospheric pressure plasma spray processes for functional layers of the tubular solid oxide fuel cell are developed to build a fuel cell structure consisting of air electrode, ceramic electrolyte, and fuel electrode. Further more the characteristics of each film are also investigated. The layers of LSM (La0.65Sr0.35MnO3) air electrode and Ni/8YSZ fuel electrode have porosities of 23 ~32 % sufficient for supplying fuel and oxidant gases efficiently to electrochemical reaction interfaces. The measured electrical conductivities of the electrodes are higher than 90 S/cm at 1000 °C, which satisfy the requirement as the current collecting electrodes. The YSZ electrolyte film has a high ionic conductivity of 0.07 S/cm at 1000 °C, but shows a bit too porous to block the oxygen molecule penetration through it. A unit tubular SOFC is fabricated by the optimized plasma spray processes for depositing each functional film and forming a porous cylindrical supporting tube of the cell, and turns out to have a promising capability of electricity generation.

Geometrical Optimization of Double Layer LSM/LSM-YSZ Cathodes by Electrochemical Impedance Spectroscopy

2009 ◽  
Vol 7 (1) ◽  
Author(s):  
Rui Antunes ◽  
Tomasz Golec ◽  
Mirosław Miller ◽  
Ryszard Kluczowski ◽  
Mariusz Krauz ◽  
...  
Keyword(s):  
Electrochemical Impedance Spectroscopy ◽  
Impedance Spectroscopy ◽  
Layer Thickness ◽  
Electrochemical Impedance ◽  
Operating Temperature ◽  
Contact Layer ◽  
Cell Performance ◽  
Functional Grade ◽  
Functional Layer ◽  
Ysz Electrolyte

The present-day high-temperature solid oxide fuel cells (SOFCs), based on yttria-stabilized zirconia (YSZ) electrolyte, a lanthanum-strontium manganite (LSM) cathode and a nickel-YSZ cermet anode, operate at 800–1000°C. Cathode materials are restricted to doped lanthanum manganites due to their stability in oxidizing atmosphere, sufficient electrical conductivity, and thermal expansion match to the YSZ electrolyte. Reduction in the operating temperature of SOFCs is desirable to lower the costs and to overcome the technological disadvantages associated with elevated temperatures. However, as the operating temperature is reduced, the decrease in the LSM conductivity and increase in interfacial polarization resistances between the LSM cathode and YSZ electrolyte become critical. Therefore, different approaches have been proposed to improve interfacial quality and electrochemical performance of the LSM/YSZ cathode. The length of the triple-phase boundary (TPB) correlates well with the interfacial resistances to electrochemical oxidation of hydrogen at the anode and reduction in oxygen at the cathode. The extension of the TPB or the number of active reaction sites becomes, therefore, a determining factor in improving electrode performance. This can be achieved by developing electrode materials of higher ambipolar conductivity and by optimizing the microstructure of the electrodes. In order to improve SOFC performance, both composition and structure of the LSM/YSZ interface and of the cathode should be optimized. Recently, functional grade materials (FGMs) were introduced for SOFC technology. However, all studies reported in the literature so far, were focused on cathodes with only compositional gradient. On the other hand, intuitionally the best structure for a functional SOFC should be characterized by both compositional and porosity gradients. Fine grains (and high surface area) close to the electrode/electrolyte surface and large grains (and thus large pore size) at the air/oxygen side are expected to be of advantage. In the present study, “symmetrical” cathode-electrolyte-cathode SOFC single cells were fabricated. The cells consisted of the functional grade LSM cathode with YSZ/LSM cathode functional layer and LSM contact layer. The effects of various geometrical and microstructural parameters of cathode/functional layers on the overall cell performance were systematically investigated. The parameters investigated were the (1) cathode functional layer thickness and grain size and (2) the LSM contact layer thickness. Cathode performances were tested by means of electrochemical impedance spectroscopy (EIS) over a temperature range of 650–950°C, using air as oxidant. The dependence of cell performance on various parameters was rationalized by a comprehensive microscale model. A cathode polarization corresponding to 0.14–0.4 Ω cm2 at 750°C was achieved in this manner.

Microwave Sintering of YSZ Electrolyte Materials for SOFC

2008 ◽  
Vol 368-372 ◽  
pp. 238-240 ◽  
Author(s):  
Xi Tang Wang ◽  
Girish M. Kale
Keyword(s):  
Microwave Sintering ◽  
X Ray Diffraction ◽  
Final Phase ◽  
X Ray ◽  
Microwave Furnace ◽  
Scanning Electron Microcopy ◽  
Conventional Sintering ◽  
Y2o3 Content ◽  
Ysz Electrolyte ◽  
Considerable Enhancement

Microwave sintering behaviors of four different compositions of YSZ electrolyte materials were investigated. The samples were sintered in 2.45GHz microwave furnace. For comparison, conventional sintering was performed at 1821K.The densities of sintered samples showed considerable enhancement in the densification process under the influence of microwave fields. The samples with lower Y2O3 content are easy to sinter. The influence of the composition and sintering methods on the final phase composition and microstructure were investigated by X-ray diffraction and scanning electron microcopy. Finer and more uniform microstructures were observed in the microwave sintered samples comparing to the conventionally sintered samples.

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