Abstract
The co-doped ceria-based materials with general composition formula Ce0.8-xYxSm0.2O2-δ (x = 0, 0.02, 0.04, 0.06) were prepared through the sol-gel method. The single phase of the prepared materials was confirmed by X-ray diffraction (XRD). The lattice parameters were determined by least square fitting of UNIT CELL programme. The linear variation of lattice parameter with concentration of Y into the samarium doped ceria (SDC) indicates the validity of Vegard’s law. The crystallite size of the samples obtained by using of Scherrer formula is in the range from 34 nm to 49 nm. The thermal expansion studies were carried out by using dilatometric technique in the temperature range from room temperature to 1000°C. It was observed that the thermal expansion increased linearly with increasing temperature for all the samples. The electrical conductivity was studied using impedance spectroscopy. It was observed that the composition Ce0.74Y0.06Sm0.2O2-δ showed higher electrical conductivity and lower activation energy (≈1.05 eV) than other compositions in the present investigation. This composition is thus a possible candidate for use the electrolyte in intermediate temperature solid oxide fuel cells (IT-SOFC).
Highlights
Solid oxide fuel cells (SOFCs) convert chemical energy directly into electrical energy with high efficiency, environmental friendliness, and great flexibility in the choice of fuel [1,2,3]
The co-doping technique has been the effective method for improving the conductivity and leads to thermal expansion match between the electrodes and electrolyte in ceria-based electrolytes for the intermediate temperature solid oxide fuel cells (IT-SOFC) [6]
The lattice parameters agree with the reported values (JCPDS powder diffraction File no. 34-394)
Summary
Solid oxide fuel cells (SOFCs) convert chemical energy directly into electrical energy with high efficiency, environmental friendliness, and great flexibility in the choice of fuel [1,2,3]. Yttria stabilized zirconia (YSZ) is the well-established electrolyte, which can be used in commercial SOFCs. A typical high-temperature of SOFC uses 8 mole% YSZ as the electrolyte, usually operated at temperatures as high as 800 ̊C - 1000 ̊C to obtain the required level of ionic conductivity. A typical high-temperature of SOFC uses 8 mole% YSZ as the electrolyte, usually operated at temperatures as high as 800 ̊C - 1000 ̊C to obtain the required level of ionic conductivity Such high operating temperatures result in expensive fabrication costs and accelerate the degradation of fuel cell systems. The co-doping technique has been the effective method for improving the conductivity and leads to thermal expansion match between the electrodes and electrolyte in ceria-based electrolytes for the IT-SOFCs [6]. REDDY the above, the effect on the thermal and electrical properties of Y co-doped ceria in comparison with samariumdoped ceria (Ce0.8Sm0.2O2 δ) is to be studied
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