Performance of an anode-supported tubular solid oxide fuel cells stack with two single cells connected by a co-sintered ceramic interconnector
✍ Scribed by Yanjie Xu; Shaorong Wang; Le Shao; Tinglian Wen; Zhaoyin Wen
- Publisher
- Elsevier Science
- Year
- 2011
- Tongue
- English
- Weight
- 544 KB
- Volume
- 36
- Category
- Article
- ISSN
- 0360-3199
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✦ Synopsis
Two anode-supported tubular solid oxide fuel cells (SOFCs) have been connected by a cosintered ceramic interconnector to form a stack. This novel bilayered ceramic interconnector consists of La-doped SrTiO 3 (La 0.4 Sr 0.6 TiO 3 ) and Sr-doped lanthanum manganite (La 0.8 Sr 0.2 MnO 3 ), which is fabricated by co-sintering with green anode at 1380 C for 3 h. La 0.4 Sr 0.6 TiO 3 (LST) acts as a barrier avoiding the outward diffusion of H 2 to the cathode; while La 0.8 Sr 0.2 MnO 3 (LSM) prevents O 2 from diffusing inward to the anode. The compatibility of LST and LSM, as well as their microstructure which co-sintered with anode are both studied. The resistances between anode and LST/LSM interconnector at different temperatures are determined by AC impedance spectra. The results have showed that the bilayered LST/LSM is adequate for SOFC interconnector application. The active area is 2 cm 2 for interconnector and 16 cm 2 for the total cathode of the stack. When operating at 900 C, 850 C, 800 C with H 2 as fuel and O 2 as oxidant, the maximum power density of the stack are 353 mW cm À2 , 285 mW cm À2 and 237.5 mW cm À2 , respectively, i.e., approximately 80% power output efficiency can be achieved compared with the total of the two single cells.