SYNTHESIS APATITE STRUCTURE MATERIAL OF LA9,33SI6-XALXO26-X/2 BY MEANS OF HYDROTHERMAL METHOD AS ELECTROLYTE IN SOLID OXIDE FUEL CELL

• Main Author: Floweri, Octia
• Format: Final Project
• Language: Indonesia
• Online Access: https://digilib.itb.ac.id/gdl/view/35306
• Institution: Institut Teknologi Bandung

The amount of fossil energy source has been decreasing rapidly. Alternative energies have been searched all over the world to solve this problem. One of the alternative energy that has huge potential to replace those fossil fuels is SOFC because it uses renewable fuels such as hydrogen and methane. Its high operating temperature makes this device needs a lot of maintenance, so it becomes less economical. Hence, it is needed to find SOFC that can be operated at intermediate temperature (600-800 OC). The apatite structure material of La9,33(SiO4)6O2 is being studied intensively for its application as an electrolyte material in SOFC operating at intermediate temperature. However, the synthesis method to produce this material needs high temperature (1300 OC for 48 hours). Therefore, hydrothermal method was chosen since it can be carried out at low temperature. This work also study the effect of Si substitution with Al, which is expected could enhance the conductivities. La9,33Si6-xAlxO26- x/2 (x = 0 ; 0,5 ; 1 ; and 1,5) samples were synthesized by means of hydrothermal method at 265 OC for 72 hours. Our study could produce high volume fraction of apatite phase. Ionic conductitity measurement showed that conductivity value of the sample with x = 1 is the highest conductivity among other samples with the conductivity value at 500 oC of 3,65x10-4 S/cm.