Promoting Influence of Doping Indium into BaCe0.5Zr0.3Y0.2O3- δ on the Chemical Stability, Sinterability and Electrical Properties

  • Author / Creator
    Wang, Guangya
  • The application of BaCe1-x-yZrxYyO3-δ series solid proton conductors in SOFCs is restricted by the trade-off among the chemical stability, sinterability and electrical conductivity under SOFCs operating conditions. The present research attempted to enhance the chemical stability, sinterability and ensure the high electrical conductivity of BaCe1-x-yZrxYyO3-δ by doping indium. BaCe0.5-xZr0.3InxY0.2O3-δ (where x = 0, 0.05, 0.1, and 0.2) powders were synthesized by a combustion method. The influence of the indium dopant on chemical stability, sinterability, and electrical properties of the sintered samples was investigated. Phase purity and chemical stability were evaluated by XRD. SEM images and a shrinkage plot showed that the sinterability of the samples was improved by the indium doping. The electrical conductivity was measured with an impedance test through a two-point method at both low (200–350 °C) and high (450–850 °C) temperature ranges in different atmospheres. BaCe0.4Zr0.3In0.1Y0.2O3-δ showed the highest electrical conductivity (1.1×10-2 in wet hydrogen at 700 °C. An anode support fuel cell was fabricated by a spin coating method. A maximum power density of 651 mW/cm2 was obtained when operating at 700 °C and fed by humid H2 and the cell ran stably for more than 100 hours.

  • Subjects / Keywords
  • Graduation date
    Fall 2014
  • Type of Item
  • Degree
    Master of Science
  • DOI
  • License
    This thesis is made available by the University of Alberta Libraries with permission of the copyright owner solely for non-commercial purposes. This thesis, or any portion thereof, may not otherwise be copied or reproduced without the written consent of the copyright owner, except to the extent permitted by Canadian copyright law.