Anionic doping strategy: F− to improve the conductivity and cell performances of SDC

The pollution and limitations of fossil energy are increasing year by year, and solid fuel cell is widely studied as a clean energy. Among electrolyte, SDC, as a common electrolyte material in fuel cell, still has some problems such as low electrical conductivity and electron conduction generated by Ce 4+ /Ce 3+ in reducing atmosphere. In this article, the influence of F − doping on SDC and electrical conductivity in Ce 0.8 Sm 0.2 O 1.95-δ-0.5x F x (CSOF)powder was investigated. A series of Ce 0.8 Sm 0.2 O 1.95-δ-0.5x F x (x = 0.1, x = 0.03, x = 0.01) solid electrolyte powders were prepared by the glycine-nitrate self-propagating method. Through phase characterization of CSOF, When the F − doping reaches 0.03, the sample has the best conductivity, 55.91*10 −3  S/cm at the temperature of 750 °C, and the conductive activation energy is 0.75 eV, which is suitable for the preparation of a single cell. In order to investigate the effect of conductivity on Ce-based materials in reducing atmosphere. Under H 2 conditions, the conductive activation energy is 0.34 eV. At a temperature of 750 °C and the current density of 0.786 A/cm 2 , the power density is maximized at 0.366 W/cm 2 , and the maximum open-circuit voltage at 550 °C is 0.986 V. This demonstrates that F − doping is beneficial for enhancing the conductivity of the electrolyte.