Abstract
In this work, Yttria (Y2O3) was successfully doped into tetragonal 3mol% yttria stabilized Zirconia (3YSZ) by high energy-mechanical milling to synthesize 8mol% yttria stabilized Zirconia (8YSZ) used as an electrolyte for high temperature solid oxide fuel cells (HT-SOFC). This work aims to evaluate the densification and ionic conductivity of the sintered electrolytes at 1650°C. The bulk density was measured according to ASTM C373-17. The powder morphology and the microstructure of the sintered electrolytes were analyzed via Field Emission Scanning Electron Microscopy (FESEM). The chemical analysis was obtained with Energy-dispersive X-ray spectroscopy (EDS). Also, X-ray diffraction (XRD) was used to obtain structural information of the starting materials and the sintered electrolytes. The ionic conductivity was obtained through electrochemical impedance spectroscopy (EIS) in the air as a function of temperatures at a frequency range of 100(mHz)-100(kHz). It is found that the 3YSZ has a higher density than the 8YSZ. The impedance analysis showed that the ionic conductivity of the prepared 8YSZ at 800°C is0.906 (S.cm) and it was 0.214(S.cm) of the 3YSZ. Besides, 8YSZ has a lower activation energy 0.774(eV) than that of the 3YSZ 0.901(eV). Thus, the prepared 8YSZ can be nominated as an electrolyte for the HT-SOFC.
Highlights
There are three Zirconia polymorphisms: monoclinic (m), tetragonal (t), and cubic (c) as shown in the scheme Figure 1
The ionic conductivity of the stabilized Zirconia qualifies it as an electrolyte for the synthesis of Solid Oxide Fuel Cell (SOFC) as an alternative and clean energy source [5]
fuel cells (FCs) are characterized by high efficiency and clean energy generating technologies with high performance which doesn't depend on system size, fuel flexibility
Summary
There are three Zirconia polymorphisms: monoclinic (m), tetragonal (t), and cubic (c) as shown in the scheme Figure 1. The ionic conductivity of the stabilized Zirconia qualifies it as an electrolyte for the synthesis of SOFC as an alternative and clean energy source [5]. FCs are characterized by high efficiency and clean energy generating technologies with high performance which doesn't depend on system size, fuel flexibility. They have a low cost of maintenance due to the absence of moving parts in the stacks. A nano-sized 8YSZ was prepared and examined for the requisite of HT-SOFC electrolyte to study their electrical characterizations and physical properties to achieve better ionic conductivity
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