In:
ECS Meeting Abstracts, The Electrochemical Society, Vol. MA2017-03, No. 1 ( 2017-07-01), p. 301-301
Abstract:
Cobalt and ion based perovskite such as Sr(CoFe)O 3 , Ba 0.5 Sr 0.5 Co 0.8 Fe 0.2 O 3- δ and La 0.6 Sr 0.4 Co 0.2 Fe 0.8 O 3- δ are considered as promising cathodes of SOFC or anodes of SOEC. However, cobalt and iron oxides are easily reacted with the gases such as H 2 , CH 4 , CO 2 and water steam at high temperature, causing the perovskite structure to be easily decomposed. To stabilize the perovskite structure of the electrodes is a serious challenge for the fabrication of the long-life SOFC or SOEC. In this work, gallium is used as a dopant to stabilize Sr(CoFe)O3, developing a SrCo 0.8 Fe 0.1 Ga 0.1 O 3-δ (SCFG) perovskite material to work as the electrodes of flexible SOFC and SOEC with a microtubular structure. SCFG show a high oxygen reducing performance when it is prepared into oxygen separation membrane, Obtaining an oxygen flux of 3~6 mL·min -1 ·cm -2 at the temperature of 800~950°C. Even under pure CO 2 , pure CH 4 and H 2 (4vol%), SCFG membrane still works steadily for as long as 200 h with no decreasing. A microtubular solid oxide cell in the configuration of Ni-YSZ|YSZ|GDC|SCFG is fabricated and tested in SOFC or SOEC modes from 550 to 850°C, using hydrogen as the fuel or as the product, respectively. Under SOFC mode, a maximum power density of 1044 mW cm -2 is obtained at 750°C. In the electrolysis mode, when the applied voltage is controlled at 2V, the electrolysis current density reaches 3.33A cm -2 at 850°C with the hydrogen production rate up to 22.9 mL min -1 cm -2 (STP). These results reveal that SCFG is a very promising oxygen electrode material for the application in both SOFC and SOEC.
Type of Medium:
Online Resource
ISSN:
2151-2043
DOI:
10.1149/MA2017-03/1/301
Language:
Unknown
Publisher:
The Electrochemical Society
Publication Date:
2017
detail.hit.zdb_id:
2438749-6
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