Current-Voltage Relationship Considering the Direction of the Electrical Field in Mixed Ionic-Electronic Solid Conductors

Wednesday, 4 October 2017
Prince George's Exhibit Hall D/E (Gaylord National Resort and Convention Center)
T. Miyashita (Miyashita Clinic)
Numerous approaches have been used to solve the transport equation describing a solid-oxide fuel cell with mixed ionic and electronic conductors, such as Sm-doped ceria. Typically, the open circuit voltage is calculated using Wagner’s equation. The current-voltage relation can also be calculated using conventional models. According to the conventional models, ionic current flows from the anode to the cathode. Electronic current flows from the cathode to the anode. Ionic current is purely drift current. Electronic current consists of drift current and diffusion current. However, the separation of electron drift current and electron diffusion current has never been calculated. Considering the direction of the electrical field, we can separate the electron drift current and electron diffusion current in a current-voltage relationship using Sm-doped ceria electrolytes.