Electrical properties of rare earth doped ceria electrolyte for solid oxide fuel cell applications

Development of a new system of solid ionic conductors based on multi-doped ceria for application in IT-SOFCs

“…It can be clearly concluded that the obtained results for the SPRT samples are in the similar range as literature data, while for the MGNP samples they are noticeably higher. With the further comparison of the values for conductivity obtained for similar materials based on oxygen ion conductors (multi-doped ceria materials) investigated in previous literature reports [12,19,20,24,25,[30][31][32][33][34]37], it may be observed that present results for the SPRT samples are in the similar range while for the MGNP samples are noticeably higher. What is more, referring to some existing studies [32,38], the present results are higher for a whole order of magnitude even for the SPRT samples.…”

“…In comparison with activation energies of similar materials from the published studies of different authors on oxygen ion conductors based on either single-, co-and multi-doped CeO 2 containing dopant concentration in the range of 15-20 mol% [12,25,[30][31][32][33][34]37], E a values obtained in this work were significantly lower. However, it could be noted that results for activation energy in the present study were similar to the values obtained in our previous studies [23,24] where nanosized samples of composition Ce 0.8 Sm 0.08 Gd 0.12 O 2-δ were obtained by following the same procedures (SPRT and MGNP methods) which indicated the benefits of their application for electrolytes production.…”

“…As commonly known, the application complex electrochemical impedance spectroscopy (EIS) is well developed technique for characterization of the electrical properties of solid electrolytes based on the interfacial reaction at the electrode surface [19,21,[23][24][25][30][31][32][33][34][35]. Besides the total conductivity values, it provides useful information related to the contribution of grains' interior, grain boundaries, and electrode-electrolyte interface to the overall ionic conductivity [23][24][25].…”

“…Despite sintering temperature as high as 1550 °C, the overall mole fraction of dopants was kept constant (x = 0.2). The dopant concentration was determined based on the previous literature reports, which found that the optimum lies within the range of 10-20 mol% for many cations in fluorite ceria lattice enabling the achievement of the highest possible ionic conductivity [22][23][24][30][31][32][33][34].…”

TEMPERATURE DEPENDENCE DIELECTRIC BEHAVIOUR OF 20GDC (CE0.8GD0.2O2-δ) EFFECT FOR SOLID OXIDE FUEL CELL APPLICATION

“…In present years, solid oxide fuel cells (SOFCs) have involved much attention due to a large amount of efficient and environmentally energy conversion devices [1][2] . Generally, yttrium-stabilized zirconia (YSZ) materials are used as electrolyte materials which require high operation temperature (Above 1000 o C), so these materials are not useful for engineering applications due to material degradability at high temperature and high cost in the economical point of view [3][4] . To reduce the operating temperature of solid oxide fuel cells (SOFCs) to below 800 o C is more important due to improving stack life span and cost reduction [5][6] .…”