A Preliminary Study on Bi-Layered Ceramic Electrolytes of Mixed Conductor and Proton Conductor

In this contribution, we present an experimental study of single-layered electrolyte with mixed ion and electron conducting ceramic material SDC (Sm0.2Ce0.8O2-x) and bi-layered electrolyte of the SDC layer with proton conducting ceramic material BCY (BaCe0.9Y0.1O3-x) to enhance the electrolyte performance. Anode supported cell structure was adopted and the button cells were fabricated through conventional tape casting-screen printing and high temperature sintering processes. It was found that the open circuit voltages of the bi-layered electrolyte cells were higher than that of the single-layered SDC electrolyte cells. The bi-layered cells showed a decent performance in the temperature range of 500-650°C. Interaction between the two electrolyte materials occurred at high sintering temperature, which led to an increase in electrolyte resistance as well as electrode polarization values.