Materials Literature
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Solid oxide fuel cells (SOFCs) are promising as energy producing devices, which at this stage of development will require extensive analysis and benefit from numerical modeling. A 3D model is developed based on the FEM for a single cell planar SOFC design optimization. Ion, electron, heat, gas-phase species and moment…
The lanthanum strontium titanate (LST) is one of the most representative alternative anode materials. Although it shows low catalytic properties, the disadvatage could be improved by doping of ruthenium which is widely used as catalyst under steam reforming reaction or oxidation reaction. The ruthenium doped lanthanum…
BaZr0.85Y0.15O3-ä (BZY) thin film was prepared by pulsed laser deposition (PLD) at of 400oC and 700oC and performance was compared as free-standing electrolyte of micro ceramic fuel cells. Structural and electrochemical analyses were conducted using scanning electron microscopy (SEM) and a customized fuel cell measure…
A novel composite cathode material for cathode-supported direct carbon fuel cells (DCFCs) was developed and characterized in terms of phase stability, sintering behavior, electrical conductivity, mechanical strengths and microstructures. It was found that the newly developed LSM/GDC composite provides sufficient level…
Molecular dynamics (MD) simulations of processes occurring in SOFC anodes require accurate description of atomic interactions. Typical SOFC anode represents nanoporous compound of Ni and yttria-stabilized zirconia (YSZ), and the main process, fuel oxidation, takes place in triple phase boundaries (TPB). Thus it is of…
For the further commercialization of SOFCs, the cost reduction for materials is one of the most important technological issues. Currently, Y or Sc is widely used as a dopant of zirconia-based electrolytes, but these rare-earth elements are relatively expensive. In this study, we have examined the possibility to use Ca…
Nanosized PrBaCo2O5+δ (PBCO) particles were prepared by means of a bead milling and deposited on porous backbone of Bi0.5Sr0.5FeO3-δ (BSF55). PBCO was pulverized into very fine particles with crystallite size of 3.0 nm by bead milling. The electrode resistance with nano-PBCO loading decreased with increasing the loadi…
The integration of gasification and solid oxide fuel cells is promising direction to meet the demand of clean and efficient utilization of coal for power generation. This study focused on the impact on performance of Ni-YSZ SOFC anode of ppm-level H2S contamination in wet hydrogen or simulated coal syngas (mixtures of…
Cracking characteristics of the positive electrode-electrolyte-negative electrode (PEN) assembly under thermal stresses in a planar solid oxide fuel cell (SOFC) stack are studied, using finite element analysis (FEA). A 3-D FEA model is constructed for a multiple-cell stack to perform thermal stress analysis at both st…
Thin-film electrolytes and nano-structure electrodes are essential components to lower the operation temperature of SOFCs. We will discuss how to precisely assess the impact of the thin-film electrolyte and the nano-structure electrodes which are realized on the anode supports, a realistic SOFC platform (anode-support…
Whereas significant advances have been reported in the performances of solid oxide fuel cells, some work has still to be done to reduce the costs connected to the overall processing of these systems. Tape casting and screen-printing are the most common techniques used for the fabrication of large area SOFCs. The produ…
In the present study, correlation between solid oxide fuel cell anode microstructure and electrochemical performance during redox cycles was analyzed. Yttria stabilized zirconia electrolyte-support cell with nickel/yttria stabilized zirconia composite for anode and lanthanum strontium manganite /yttria stabilized zirc…
Anode supported thin film electrolytes are nowadays the mostly used cells in the SOFC area. Unfortunately they are dramatically damaged if re-oxidation occurs in the anode chamber. In order to overcome this problem, Fiaxell Sàrl developed an anode supported half-cell, the 2R-Cell™, that provides robustness and reliabi…
This work aims to associate two innovative promising oxide materials, the perovskite-type BaIn0.3Ti0.7O3-δ (BIT07) electrolyte and the lanthanide nickelate Pr2-xNiO4+δ cathode, in a planar anode-supported SOFC for an efficient operation at 700°C. The cell elaboration protocol will be briefly described, and the results…
The nonstoichiometry of single phase perovskite Pr0.6Sr0.4Co0.2Fe0.8O3-δ (PSCF) was measured in the temperature range 800 ⁰C-600 ⁰C. The nonstoichiometry for PSCF was found to be greater than LSCF for all measured temperatures and oxygen partial pressures (Po2) tested. A defect equilibria model was developed based on…
Typical anodes of solid oxide fuel cell consist of a cermet of electronic conductor such as Ni and oxygen ion conductor such as yttria-stabilized zirconia, and have porous structure to enlarge reaction sites. It has been recognized that volume expansion of the Ni species during redox cycle can damage the anode structu…
Solid oxide fuel cells (SOFCs) and solid oxide electrolysis cells (SOECs), which are composed of Ni-yttria-stabilized zirconia (YSZ) fuel electrode, YSZ electrolyte, gadolinia-doped ceria (GDC) interdiffusion barrier layer, and (La0.8Sr0.2)0.95Co0.2Fe0.8O3 (LSCF) air electrode, were fabricated and electrochemically te…
High SOFC operating temperature allows direct internal reforming (DIR) of methane within the SOFC anode. However, carbon formation reduces considerably the performance and durability of the cells. A key step towards improving SOFC performance is to understand the detailed surface kinetics and electrochemistry for DIR…
This paper describes the developments of the project about the synthesis of proton conductive BaCe0.9Y0.1O3-δ (BCYO) membrane with thin chemically more stable protective BaZr0,9Y0,1O3- δ (BZYO) layer. Dense pellets of BCYO with good phase purity were synthesized from nanopowders and electrochemical as well as microstr…
Nickel–yttria-stabilized zirconia (Ni–YSZ) is widely used as an anode material for solid oxide fuel cells (SOFCs). However, it is concerned that the performance of Ni–YSZ anode is deteriorated by redox treatments accompanied with the microstructural change. In this study, we investigated the correlation between the pe…