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Interface formation and Mn segregation of directly assembled La0.8Sr0.2MnO3 cathode on Y2O3-ZrO2 and Gd2O3-CeO2 electrolytes of solid oxide fuel cells
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He, Shuai, Chen, Kongfa, Saunders, Martin, Quadir, Zakaria, Tao, Shanwen, Irvine, John T.S., Cui, C. Q. and Jiang, San Ping (2018) Interface formation and Mn segregation of directly assembled La0.8Sr0.2MnO3 cathode on Y2O3-ZrO2 and Gd2O3-CeO2 electrolytes of solid oxide fuel cells. Solid State Ionics, 325 . pp. 176-188. doi:10.1016/j.ssi.2018.08.016
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WRAP-interface-formation-segretation-directly-oxide-fuel-cells-Tao-2018.pdf - Accepted Version - Requires a PDF viewer. Available under License Creative Commons Attribution Non-commercial No Derivatives 4.0. Download (2460Kb) | Preview |
Official URL: http://dx.doi.org/10.1016/j.ssi.2018.08.016
Abstract
The establishment of intimate electrode/electrolyte interface is very important in solid oxide fuel cells (SOFCs), because it plays a critical role in the overall cell performance and durability. In this study, Mn segregation and interface formation between directly assembled La0.8Sr0.2MnO3 (LSM) electrode and yttrium-stabilized zirconia (YSZ) or gadolinium-doped ceria (GDC) electrolytes are studied using combined focused ion beam and scanning transmission electron microscopy (FIB-STEM). In the case of LSM/YSZ and LSM/GDC electrodes, a significant reduction in the electrode ohmic resistance is observed after cathodic polarization at 900 °C and 500 mA cm−2, indicating the formation of an intimate interface. However, LSM particles start to disintegrate at the electrode/electrolyte interface with the increase of polarization time in the case of LSM/YSZ electrode. On the other hand, the LSM/GDC interface is very stable with negligible microstructure change at the interface. Mn segregation from the LSM perovskite structure is identified under the influence of polarization in both LSM/YSZ and LSM/GDC electrodes. The results demonstrate that nature of the electrolyte plays a critical role in the electrochemical activity, microstructure, morphology and stability of LSM/electrolyte interface under SOFC operation conditions.
| Item Type: | Journal Article | ||||||||||||
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| Subjects: | T Technology > TK Electrical engineering. Electronics Nuclear engineering | ||||||||||||
| Divisions: | Faculty of Science > Engineering | ||||||||||||
| Library of Congress Subject Headings (LCSH): | Solid oxide fuel cells, Zirconium oxide, Perovskite | ||||||||||||
| Journal or Publication Title: | Solid State Ionics | ||||||||||||
| Publisher: | Elsevier Science BV | ||||||||||||
| ISSN: | 0167-2738 | ||||||||||||
| Official Date: | 1 November 2018 | ||||||||||||
| Dates: |
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| Volume: | 325 | ||||||||||||
| Page Range: | pp. 176-188 | ||||||||||||
| DOI: | 10.1016/j.ssi.2018.08.016 | ||||||||||||
| Status: | Peer Reviewed | ||||||||||||
| Publication Status: | Published | ||||||||||||
| Access rights to Published version: | Restricted or Subscription Access | ||||||||||||
| RIOXX Funder/Project Grant: |
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