Work

Current interrupt method for calculating the electrochemical impedance in a solid oxide electrolysis stack

Year: 2025

Type: article

Abstract: In this work the time domain response of Solid Oxide Electrolysis Cells (SOEC) to a current interruption was transformed into the frequency domain using a carrier function Laplace transform , which is fit to the experimental data using a MATLAB Complex Nonlinear Least Squares (CNLS) solver to obtain the complete impedance spectrum. The hardware implementation, consisting principally of a high-speed switch and a fast-logging Analog to Digital Converter (ADC), was assembled and tested using a calibration module to assess the accuracy, repeatability , and speed of acquisition of the prototype device as compared against a calibrated commercial impedance spectrometer. Additionally, the current interrupt device and commercial Frequency Response Analyzer (FRA) were used to acquire the impedance spectra of a four cell SOEC stack with a large, 300 cm 2 , active cell area.

Source: Journal of Power Sources

DOI: 10.1016/j.jpowsour.2025.237051

Authors: Nathanael Royer, Kerry Meinhardt, Dustin McLarty, Olga A. Marina

Language: English

Topic: Advancements in Solid Oxide Fuel Cells

Subfield: Materials Chemistry

Field: Materials Science

Domain: Physical Sciences

SDG: Affordable and clean energy

Open Access status: hybrid

Estimated APC paid: $4,230

Funders: U.S. Department of Energy, Battelle