Synthesis of Bismuth Oxide Based Material for Sofc Electrolyte with Yttria addictive and their Characterization

Research on synthesis of solid electrolyte SOFC based on bismuth oxide and yttrium oxide as dopant has been done through pressing technique process, where bismuth oxide and yttrium oxide chloride are as its raw materials. Both of materials are dissolved and then co-precipitated to get a mixture material which has very small grain size (nm), continued with sintering process with temperature variation of 1000 oC, 1050 oC, 1100oC and holding time of 1 hour. The result of this process is analyzed by dilatometer at room temperature until 1000 oC, which gave the coefficient of thermal expansion of 11.9 x 10-6/ oC to 13.4 x 10-6/ oC. The measurement of density by Archimedes method (ASTM D 792), gave the value of density of 6.2 g/cm3 until 7.6 g/cm3. Using ASTM C20 procedure, the porosity measured are 18.3 % until 0.2 %. The Impedance complex spectroscopy and Frequency Response Analyzer (FRA) Solartron 1260 is used for measuring ionic conductivity. The ionic conductivity are increasing on temperature range 500 oC until 800 oC, which are 5 x 10-3/ Ω.cm to 1.8 x I0-1/ Ω.cm. The yttrium oxide dopant increased bismuth oxide ionic conductivity for 10 times until 1000 times. (author)