Stable LSM/LSTM bi-layer interconnect for flat-tubular solid oxide fuel cells
SCIE
SCOPUS
- Title
- Stable LSM/LSTM bi-layer interconnect for flat-tubular solid oxide fuel cells
- Authors
- Yoon, Heechul; Kim, Taewook; Park, Sungtae; Sammes, Nigel Mark; Chung, Jong-Shik
- Date Issued
- 2018-01
- Publisher
- Pergamon Press Ltd.
- Abstract
- A bi-layer interconnect with La0.8Sr0.2MnO3 and La0.4Sr0.6Ti0.6Mn0.4O3 (LSM/LSTM) is applied to anode-supported button cells and flat-tubular cells. Using a button cell, SEM images and gas permeation tests confirm that the bi-layer possesses a dense microstructure. The area specific resistance (ASR) of the LSM/LSTM remains nearly constant under oxidizing/reducing atmospheres with varying gas concentrations. For comparison, an LSM/LST with the same thickness is prepared; an increase in the ASR is observed as the concentration of H-2 feed to the LST side decreases. The difference in the ASR of LSM/LST can be explained by exposure to a relatively high oxygen partial pressure and partial destruction of the interfacial LST layer region where oxygen diffuses from the LSM layer. Flat-tubular cells with the LSM/LSTM bi-layer interconnect achieve a maximum power density (MPD) of 463 mW cm(-2) using humidified H-2 fuel and air at 800 degrees C. With decreasing H-2 concentration in the fuel, the polarization resistance increases rather than the ohmic resistance, implying that the LSM/LSTM interconnect provides stable conduction property. In comparison with the conventional LSM/LST interconnect cell, it shows improved stability and performance as the concentration of H-2 in the fuel decreases. (C) 2017 Hydrogen Energy Publications LLC. Published by Elsevier Ltd. All rights reserved.
- URI
- https://oasis.postech.ac.kr/handle/2014.oak/99324
- DOI
- 10.1016/j.ijhydene.2017.11.024
- ISSN
- 0360-3199
- Article Type
- Article
- Citation
- International Journal of Hydrogen Energy, vol. 43, no. 1, page. 363 - 372, 2018-01
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