Characterizations of Synthetic 8mol% YSZ with Comparison to 3mol %YSZ for HT-SOFC

Al-Attar, Abeer F.; Farid, Saad B. H.; Hashim, Fadhil A.

doi:10.30684/etj.v38i4A.351

	Characterizations of Synthetic 8mol% YSZ with Comparison to 3mol %YSZ for HT-SOFC
Engineering and Technology Journal
Article 2, Volume 38, 4A, 2020, Pages 491-500 PDF (632.21 K)
DOI: 10.30684/etj.v38i4A.351
Authors
Abeer F. Al-Attar^* ; Saad B. H. Farid^* ; Fadhil A. Hashim
Department of Materials Engineering, University of Technology, Baghdad, Iraq
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.
Keywords
8YSZ; HT-SOFC; electrolyte; EIS; EDS; AC conductivity

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