Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
7738098 | Journal of Power Sources | 2014 | 9 Pages |
Abstract
The stability of strontium-doped lanthanum manganite (LSM) cathode has been studied using symmetric cells (humidified air, LSM/yttria-stabilized zirconia (YSZ)/LSM, humidified air) under a range of humidification levels (0-50%), temperatures (750-850 °C), and cathodic biases (0-0.5 V). Electrochemical impedance spectroscopy revealed an increase in non-ohmic resistance with increasing H2O/O2 ratio, temperature, and cathodic bias. Post-test surface and interface studies showed the segregation of SrO particles on the LSM surface and formation of Mn2O3 and La2Zr2O7 compounds at the cathodic LSM/YSZ interface. The increase in non-ohmic resistance is attributed to surface segregation of SrO and interfacial compound formation, whereas formation and growth of SrO at the LSM surface is attributed to water adsorption. La2Zr2O7 formation is attributed to interfacial reactions.
Related Topics
Physical Sciences and Engineering
Chemistry
Electrochemistry
Authors
Boxun Hu, Michael Keane, Manoj K. Mahapatra, Prabhakar Singh,