Sulfur Poisoning and Performance Recovery of SOFC Air Electrodes.

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Publisher: Frontiers Research Foundation
Document Type: Article
Length: 420 words
Lexile Measure: 1530L

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Author(s): Junsung Hong, M. R. Anisur, Su Jeong Heo, Pawan Kumar Dubey, Prabhakar Singh

The sulfur poisoning and performance recovery of the state-of-the-art SOFC cathodes (La<sub>0</sub>.<sub>80</sub>Sr<sub>0</sub>.<sub>20</sub>)<sub>0</sub>.<sub>95</sub>MnO<sub>3</sub><sub>±</sub><sub>[DELTA]</sub> (LSM) and (La<sub>0</sub>.<sub>60</sub>Sr<sub>0</sub>.<sub>40</sub>)<sub>0</sub>.<sub>95</sub>Co<sub>0</sub>.<sub>20</sub>Fe<sub>0</sub>.<sub>80</sub>O<sub>3</sub><sub>-</sub><sub>[DELTA]</sub> (LSCF), have been studied. Electrochemical impedance spectroscopy measurements of LSCF|GDC and LSM|YSZ half-cells are carried out in alternating atmospheres of air and SO<sub>2</sub>-air at 700°C for hundreds of hours. In the presence of SO<sub>2</sub>, the electrochemical performance of both the cells decays with ohmic and non-ohmic losses, owing to the absorption and chemical interaction of SO<sub>2</sub> with the electrodes. In LSCF, the SrO segregated on the surface tends to absorb and react with SO<sub>2</sub>, forming SrSO<sub>4</sub>...

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Gale Document Number: GALE|A659718908