Tuesday, 2 October 2018
Universal Ballroom (Expo Center)
Solid oxide fuel cells (SOFCs) are a clean electrochemical conversion devices from chemical energy of fuel to electrical energy. SOFCs are considered as future green energy devices because of their diverse advantages including high energy conversion efficiency, various fuel acceptance, and negligible gas pollutants [1]. Now, the performance of SOFCs is highly affected by the oxygen reduction reaction (ORR) in the cathode of SOFCs. Until now, the major materials of cathode are cobalt-contained perovskite oxides because they show a low over-potential for ORR with the high SOFC performance [2]. However, cobalt-contained perovskite cathode materials also have several technical issues, such as expensive price, low chemical stability, and big difference of thermal expansion coefficient (TEC) to the zirconia-based electrolyte. The TEC of cobalt-contained perovskite oxides is 20-25×10-6K-1, whereas the yttria-stabilized zirconia and lanthanide-doped ceria electrolytes are 11-13×10-6K-1. This can results in the delamination of cell components during high temperature operation [3]. On the other hand, the TEC of lanthanum nickelates (Lan+1NinO3n+1) is 11-12×10-6K-1, which is similar to that of electrolyte materials and thus high thermal stability is expected for the SOFC[4]. Hence. in this work, the characteristics of lanthanum nickelates in terms of performance and durability are investigated.
References
[1] K.T. Lee, E.D. Wachsman, Science 334 (2011) 935.
[2] W. Zhou, Z. Shao, J. Power Sources 192 (2009) 231.
[3] S. Pang, X. Xi, J. Power Sources 326 (2016) 176.
[4] R.K. Sharma, E. Djurado, J. Power Sources 325 (2016) 337.
[5] C. Nicollet, J. Grenier, ECS Trans (2015) volume 68,issue 1, 837-845.
[6] C. Laberty, A. V. Virkar, Electrochem. Solid-State Lett (2007) volume 10, issue 10,B170-B174.