|About this Abstract
||2018 TMS Annual Meeting & Exhibition
||Materials for Energy Conversion and Storage
||An Intermediate-temperature Oxygen Transport Membrane Based on Rare-earth Doped Bismuth Oxide
||Kyle S Brinkman, Mingyang Zhao, Tao Hong, Frank Chen, Shumin Fang, Siwei Wang, Hailiang Zhang
|On-Site Speaker (Planned)
||Kyle S Brinkman
A ceramic oxygen pump based on dysprosium and tungsten co-doped bismuth oxide (DWSB) was synthesized and characterized. The DWSB oxygen ion conducting electrolyte with a composition of Dy0.08W0.04Bi0.88O2-δ displayed the highest oxygen ion conductivity and was chemically compatible with the La0.8Sr0.2MnO3-δ (LSM) electrode material. A composite electrode was fabricated with DWSB-LSM in the mass fraction of 50:50 exhibiting the lowest polarization resistance with the DWSB electrolyte. In the composite electrode, larger DWSB particles act as backbone for the oxygen transport pathway, while LSM particles deposited on the surface of the DWSB backbone serve as mixed ionic-electronic conductors accelerating surface oxygen exchange. An oxygen flux of 5.9 mL cm−2 min−1 at 650C under 1 V applied bias was realized in the DWSB electrolyte (0.75 mm) supported membrane incorporating DWSB-LSM electrodes on feed and permeate sides. Further improvements to the electrochemical performance were achieved by fabricating a thin, electrode will be addressed.