Articles
  • Sonochemical synthesis of highly sinterable/nanocrystalline CeO2-based electrolyte powders for intermediate-temperature solid oxide fuel cells
  • Eun-Hui Hyeonga, Seung-Muk Baea, Chan-Rok Parka, Jong-Sung Parkb, Young-Sung Yooc, Hee-Sun Yanga and Jin-Ha Hwanga,*
  • a Department of Materials Science and Engineering, Hongik University, Seoul 121-791, Republic of Korea b Department of Materials Science and Engineering, Myongji University, Gyonggi-do 449-728, Republic of Korea c Green Growth Technology Laboratory, Korea Electric Power Research Institute, 65 Munji-Ro, Yuseong-Gu, Daejeon 305-760, Republic of Korea
Abstract
Sonochemical processing was used to synthesize highly sinterable nanocrystalline cerium oxide-based materials (i.e., Gd2O3- doped and Sm2O3-doped CeO2 electrolytes). The crystallinity and grain size was investigated using X-ray diffraction and transmission electron microscopy, confirming that the nanocrystals were approximately 5 nm to 7 nm in size. The feature of nanocrystalline particles resulted in a 200 οC lower sintering temperature than the conventional 1,550 οC sintering temperature used for commercial microcrystalline CeO2-based materials. This significant improvement in sintering temperature was confirmed by microstructural and sintering characterization.

Keywords: Sonochemical processing, Nanocrystalline electrolytes, Solid oxide fuel cells, Cerium oxide.

This Article

  • 2012; 13(3): 349-352