The necessity for experimental verification of leakage currents using Sm-doped ceria electrolytes (SDC) in solid-oxide fuel cells (SOFCs) has been indicated. This paper describes the theoretical limitations of Wagner's equation and details the analytical work that has been performed to support the experimental results. These limitations cannot be solved, even considering polarization voltage lo...

The process of reactant transportation greatly affects the performance solid oxide fuel cells (SOFCs). Therefore, a three-dimension numerical SOFC model was built to evaluate mainly effect coupling heat and mass transfer electrochemical reactions, reliability calculations validated. Numerical studies revealed correlation both increase concentration gradients improved capability multi reactants ...

The adhesion of thermal oxide scale grown at 800°C on ferritic stainless steel AISI 441 proposed as SOFCs interconnectors was investigated. influence oxidising atmosphere considered by 20% O 2 -N or H O-N the representative cathode and anode atmospheres, respectively. A tensile test in an SEM chamber used to assess behaviour. spallation has important candidate SOFCs. energy strain stored oxide,...

The main obstacle to solid oxide fuel cells (SOFCs) implementation is the high operating temperature in range of 800–1,000 °C so that it has an impact on costs. SOFCs work at temperatures causing rapid breakdown between layers (anode, electrolyte, and cathode) because they have different thermal expansion. study focused reducing medium range. SmBa0.5Sr0.5Co2O5+δ (SBSC) was studied as a cathode ...

Direct utilization and internal reforming of gaseous fuels is investigated on symmetric-architecture metal supported solid oxide fuel cells (MS-SOFCs) with thin ceramic electrolyte scaffold backbone layers, low cost ferritic stainless steel supports both sides. Infiltrated Pr-oxide Ni/samarium-doped ceria catalysts are added to the cathode anode electrodes, respectively. Initial performance dur...

Nanoionics has become increasingly important in devices and systems related to energy conversion and storage. Nevertheless, nanoionics and nanostructured electrodes development has been challenging for solid oxide fuel cells (SOFCs) owing to many reasons including poor stability of the nanocrystals during fabrication of SOFCs at elevated temperatures. In this study, a conformal mesoporous ZrO2 ...

Solid oxide fuel cells (SOFCs) are inevitably affected by the tensile stress field imposed by the rigid substrate during constrained sintering, which strongly affects microstructural evolution and flaw generation in the fabrication process and subsequent operation. In the case of sintering a composite cathode, one component acts as a continuous matrix phase while the other acts as a dispersed p...

Novel strategies based on spray-pyrolysis deposition are proposed to increase the triple-phase boundary (TPB) of La0.8Sr0.2MnO3-δ (LSM) cathodes in contact with yttria-stabilized zirconia (YSZ) electrolyte: (i) nanocrystalline LSM films deposited on as-prepared YSZ surface; (ii) the addition of poly(methyl methacrylate) microspheres as pore formers to further increase the porosity of the film c...

■ Abstract The structural and chemical parameters determining the formation and mobility of protonic defects in oxides are discussed, and the paramount role of high-molar volume, coordination numbers, and symmetry are emphasized. Symmetry also relates to the structural and chemical matching of the acceptor dopant. Y-doped BaZrO 3-based oxides are demonstrated to combine high stability with high...

Solid oxide fuel cells (SOFCs) are promising electrochemical devices that enable the highest fuel-to-electricity conversion efficiencies under high operating temperatures. The concept of multi-stage electrochemical oxidation using SOFCs has been proposed and studied over the past several decades for further improving the electrical efficiency. However, the improvement is limited by fuel dilutio...