Closed-Pore Formation in Oxygen Electrodes for Solid Oxide Electrolysis Cells Investigated by Impedance Spectroscopy.

ABSTRACT: Electrochemical impedance spectroscopy was used to investigate the chemical capacitance of La_0.6Sr_0.4CoO_3-δ (LSC) thin-film electrodes under anodic polarization (i.e., in the electrolysis mode). For this purpose, electrodes with different microstructures were prepared via pulsed-laser deposition. Analysis of dense electrodes and electrodes with open porosity revealed decreasing chemical capacitances with increasing anodic overpotentials, as expected from defect chemical considerations. However, extremely high chemical capacitance peaks with values in the range of 10⁴ F/cm³ at overpotentials of >140 mV were obtained after annealing for several hours in synthetic air and/or after applying high anodic bias voltages of >750 mV. From the re

SUBMITTER: Krammer M 

PROVIDER: S-EPMC9940111 | biostudies-literature | 2023 Feb

REPOSITORIES: biostudies-literature