|About this Abstract
||2018 TMS Annual Meeting & Exhibition
||9th International Symposium on High Temperature Metallurgical Processing
||Solid Oxide Membrane-based Green Processing and Modeling of Silicon Production
||Thomas Villalon, Jicheng Guo, Uday Pal, Soumendra Basu
|On-Site Speaker (Planned)
Previous research has demonstrated the ability to produce silicon in a zero carbon emission manner from its oxide using the Solid Oxide Membrane (SOM) Electrolysis Process at 1070 °C (1343 K). To facilitate long-term operation and scale-up, improvements were made to the cell’s materials selection and the molten salt composition. These changes allow the cell to run at 1300 °C (1573 K) over an extended period of time without corroding the membrane. A liquid tin pool served as the cathode in a boron nitride dish, connected to a tungsten rod current collector. An inert anode assembly was composed of a LSM (La0.8Sr0.2MnO3-δ)-Stainless Steel anode current collector within a YSZ (yttria-stabilized zirconia) membrane. The cell was electrochemically characterized to create an electrochemical polarization model. Membrane stability was examined using scanning electron microscopy and energy-dispersive X-ray spectroscopy. Other techniques were used to quantify the purity of the produced silicon.