Nurbanasari, Meilinda and Syarif, D.G and Fahmy, M.J. and Irwan, Y. and Siswanto, Anggun. P (2020) Characterization of Calcia Stabilized Zirconia Synthesis for Solid Oxide Fuel Cell Electrolytes through Precipitation Method. International Journal of Engineering Research and Technology, 13 (12). pp. 4011-4015. ISSN ISSN 0974-3154

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Abstract

Indonesia has abundant natural resources which are potential to be converted into alternative renewable energy sources to offset the increasing future demand of electrical energy. One of them is Calcia (CaO) which is generally used to stabilize zirconia in order to form Calcia stabilized Zircon (CSZ). The latter is known as a solid electrolyte material in solid oxide fuel cell (SOFC). This fuel converts chemical energy into electrical energy with the advantage of having good impacts on the environment as well as a renewable fuel. An important part of SOFC is the electrolyte, in which ions flow from the cathode to the anode. The electrolyte is made from zirconia, which needs to be stabilized in a cubic phase to be able to flow the ions. Currently, Yttria has been widely used as a zirconia stabilizer in SOFC solid electrolytes. However, Yttria material is generally expensive and it is not widely available especially in Indonesia. Therefore, this research focused on producing CSZ from Zr(OH)4 which was extracted from local zircon sand (ZrSiO4) and synthesized with CaO to produce CSZ powder by precipitation method. The CSZ powder was then transformed into pellets by compacting and sintering at the temperature of 1250˚C. CSZ powders and pellets were characterized using X-ray diffraction (XRD) testing to determine the crystal structure and Scanning Electron Microscopy with Energy Dispersive Spectroscopy to analyse the microstructure. The XRD test results on CSZ powders and pellets showed a pattern that was in accordance with that typically found for CSZ powders and pellets. Micro structural analysis showed that the porosities were still observed and there was an element of silicon impurity.

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