Degradation of oxygen reduction reaction kinetics in porous La0.6Sr0.4Co0.2Fe0.8O3-δ cathodes due to aging-induced changes in surface chemistry
作者： Laura C. Baqué , Analía L. Soldati , Erico Teixeira-Neto , Horacio E. Troiani , Anja Schreiber
DOI: 10.1016/J.JPOWSOUR.2016.10.090
关键词:
摘要: Abstract The modification of surface composition after long-term operation is one the most reported degradation mechanisms (La,Sr)(Co,Fe)O3-δ (LSCFO) cathodes for Solid Oxide Fuel Cells (SOFCs). Nevertheless, its effect on oxygen reduction reaction kinetics porous LSCFO has not been yet reliably established. In this work, La- and Sr-enrichment at induced 50 h aging 800 °C under air. Such cation redistribution can extend up to ∼400 nm depth as detected by high resolution Scanning Transmission Electron Microscopy-Energy Dispersive Spectroscopy maps acquired inside cathode pores. observed chemical changes hamper exchange LSCFO/gas interface. Accordingly, a suitable Electrochemical Impedance analysis revealed that ion conductivity remains practically unaltered during treatment while resistance increases 1.8 times. As result, impedance response deteriorates within 10–0.1 Hz frequency range treatment, resulting in total area specific increase 150%. methodology adopted demonstrated be very valuable studying SOFC produced composition.
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sci-hub.se 参考文章(39)
Brian C. H. Steele, Angelika Heinzel, Materials for fuel-cell technologies Nature. ,vol. 414, pp. 345- 352 ,(2001) , 10.1038/35104620
LC Baqué, PS Jørgensen, W Zhang, KV Hansen, M Søgaard, None, Effect of Aging on the Electrochemical Performance of LSM-YSZ Cathodes Journal of The Electrochemical Society. ,vol. 162, ,(2015) , 10.1149/2.0181509JES
Y. L. Yang, C. L. Chen, S. Y. Chen, C. W. Chu, A. J. Jacobson, Impedance studies of oxygen exchange on dense thin film electrodes of La0.5Sr0.5CoO3-δ Journal of The Electrochemical Society. ,vol. 147, pp. 4001- 4007 ,(2000) , 10.1149/1.1394010
Ghislain M. Rupp, Helena Téllez, John Druce, Andreas Limbeck, Tatsumi Ishihara, John Kilner, Jürgen Fleig, Surface chemistry of La0.6Sr0.4CoO3−δ thin films and its impact on the oxygen surface exchange resistance Journal of Materials Chemistry A. ,vol. 3, pp. 22759- 22769 ,(2015) , 10.1039/C5TA05279C
John Druce, Tatsumi Ishihara, John Kilner, Surface composition of perovskite-type materials studied by Low Energy Ion Scattering (LEIS) Solid State Ionics. ,vol. 262, pp. 893- 896 ,(2014) , 10.1016/J.SSI.2013.09.010
Neelima Mahato, Amitava Banerjee, Alka Gupta, Shobit Omar, Kantesh Balani, Progress in material selection for solid oxide fuel cell technology: A review Progress in Materials Science. ,vol. 72, pp. 141- 337 ,(2015) , 10.1016/J.PMATSCI.2015.01.001
Jimmi Nielsen, Johan Hjelm, Impedance of SOFC electrodes: A review and a comprehensive case study on the impedance of LSM:YSZ cathodes Electrochimica Acta. ,vol. 115, pp. 31- 45 ,(2014) , 10.1016/J.ELECTACTA.2013.10.053
Ellen Ivers-Tiffée, André Weber, Dirk Herbstritt, Materials and technologies for SOFC-components Journal of the European Ceramic Society. ,vol. 21, pp. 1805- 1811 ,(2001) , 10.1016/S0955-2219(01)00120-0
Bernard A Boukamp, Henny JM Bouwmeester, Interpretation of the Gerischer impedance in solid state ionics Solid State Ionics. ,vol. 157, pp. 29- 33 ,(2003) , 10.1016/S0167-2738(02)00185-6
Per Hjalmarsson, Martin Søgaard, Mogens Mogensen, Oxygen transport properties of dense and porous (La0.8Sr0.2)0.99Co0.8Ni0.2O3-δ Solid State Ionics. ,vol. 180, pp. 1290- 1297 ,(2009) , 10.1016/J.SSI.2009.07.012