Effect of temperature on the chromium deposition and poisoning of La0.6Sr0.4Co0.2Fe0.8O3-δ cathodes of solid oxide fuel cells
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In this study, the effect of the temperature on the surface segregation and Cr deposition on La0.6Sr0.4Co0.2Fe0.8O3-ä(LSCF) cathodes is investigated using confocal laser Raman spectroscopy and electrical conductivity relaxation (ECR) method. The results show that the segregation of SrO phase on the LSCF surface decreases with the decreasing of temperature. Cr deposition takes place on the LSCF surface after the heat-treatment in the presence of Cr2O3at temperature range of 700 to 900°C for 48 h, formingSrCrO4phase. As the temperature decreases, less SrCrO4phase is detected. The surface exchange coefficient of LSCF measured at 900, 800 and 700?C after the heat-treatment in the presence of Cr2O3for 48 his 1.5 × 10-4, 1 × 10-4and 4 × 10-5cm s-1, respectively, which is much lower than that measured on the sample tested in the absence of Cr deposition. Chromium poisoning deteriorates the surface exchange and diffusion processes for the O2reduction reaction on LSCF electrodes. Cr deposition decreases significantly with the decrease of temperature, most likely due to the reduced Sr segregation as well as the decrease of the partial pressure of gaseous Cr species at reduced temperatures.
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Raman Spectroscopy Study of Chromium Deposition on La0.6Sr0.4Co0.2Fe0.8O3-δ Cathode of Solid Oxide Fuel CellsZhao, L.; Zhang, Jin; Becker, Thomas; Jiang, San Ping (2014)Chromium deposition and poisoning is one of the most fundamental issues affecting the performance stability of La0.6Sr0.4Co0.2Fe0.8O3-d (LSCF) perovskite electrode materials used in intermediate temperature solid oxide ...
Insight into surface segregation and chromium deposition on La0.6Sr0.4Co0.2Fe0.8O3-δ cathodes of solid oxide fuel cellsZhao, L.; Drennan, J.; Kong, C.; Amarasinghe, S.; Jiang, San Ping (2014)La0.6Sr0.4Co0.2Fe0.8O3-δ (LSCF) perovskite oxide is one of the most important cathode materials in the development of intermediate temperature solid oxide fuel cells (IT-SOFCs), but vulnerable to chromium deposition and ...
Cr deposition on porous La0.6Sr0.4Co0.2Fe0.8O3 − δ electrodes of solid oxide cells under open circuit conditionWei, B.; Chen, K.; Wang, C.; Lü, Z.; Jiang, San Ping (2015)The effect of Cr deposition and poisoning on the electrochemical activity and microstructure of La0.6Sr0.4Co0.2Fe0.8O3 − δ (LSCF) electrodes is investigated in detail under open circuit conditions at 900 °C, 800 °C and ...