Current-Voltage and Temperature Characteristics of Anode Supported Solid Oxide Electrolyzer Cells (SOEC)

Abstract

Our zero-dimensional and isothermal stationary model predicts the current-voltage (C/V) characteristics of anode supported SOFC single cells in the direct as well as in the reverse (electrolyzer) operation mode. An extended model is presented for the electrolyzer mode, taking the corrected cell temperature as additional variable into consideration. This cell temperature is derived from measurement applying single-frequency electrochemical impedance spectroscopy (SF-EIS).

Electrochemical Modeling of the Current-Voltage Characteristics of an SOFC in Fuel Cell and Electrolyzer Operation Modes

“…The error in SOEC mode seems to be caused by specific temperature effects originating from hydrogen generation consuming electrical ( G) and thermal (T S) energy in SOEC mode and by the generation of heat in SOFC mode. In order to analyze this the actual cell temperature in the reaction zone was determined through an impedance-based temperature measurement routine, first introduced in 52,53 and described briefly in the next section.…”

Deconvolution of Gas Diffusion Polarization in Ni/Gadolinium-Doped Ceria Fuel Electrodes

“…The remaining deviation between calculated and measured current-voltage curves is most probably caused by the difference between the internal cell temperature (electrolyte temperature) and the measured temperature. 39 It is now possible to quantify the individual loss contributions (Fig. 15).…”

High Temperature Electrolysis in Alkaline Cells, Solid Proton Conducting Cells, and Solid Oxide Cells

“…Describing and modeling the electrochemical electrolysis cell performance via impedance breakdown and physical equivalent circuit models ,, may be successful in describing both the electrode and gas phase kinetics. This approach has been used to describe the electrolysis performance and the difference between fuel cell and electrolysis cell performance. ,,, These models provide quantitative information about the different losses in the specific cell for the given operating condition. It has to be stressed that these models will not be general as mentioned above (due to the cell variations) and will only apply for a specific cell.…”

“…This approach has been used to describe the electrolysis performance and the difference between fuel cell and electrolysis cell performance. 272,273,635,636 These models provide quantitative information about the different losses in the specific cell for the given operating condition. It has to be stressed that these models will not be general as mentioned above (due to the cell variations) and will only apply for a specific cell.…”