|About this Abstract
||2018 TMS Annual Meeting & Exhibition
||Materials for Energy Conversion and Storage
||Combinatorial Development of Hetero-structured LSC-113 and LSC-214 Perovskite Cathode for High ORR Activity
||Doğancan Sarı, Ziya Cagri Torunoglu, Yunus Eren Kalay, Tayfur Ozturk
|On-Site Speaker (Planned)
Slow oxygen reduction/evolution (ORR/ORE) reaction kinetics is often rate limiting step in IT-SOFCs as well as in catalytic reforming of carbon dioxide. Recently, the introduction of dissimilar interfaces in La1-xSrxCoO3-d(LSC-113) and (La1-ySry)2CoO4+d(LSC-214),i.e. mixed conductive nanocomposite perovskites resulted in improved activity in ORR/OER. Although the beneficial effects of these interfaces are quite well-known, the full potential of these hetero-structures have not yet been explored. In this study, a combinatorial approach was used to optimize LSC113-LSC214 nanocomposites for improved ORR in the temperature range from 700 to 400oC. For this purpose, LSC113 and LSC214 were co-sputtered onto a set of substrates spatially distributed on a plane above, each with a different phase mixtures. The library of cathodes obtained was then screened by electrochemical impedance spectroscopy as well as by performance measurements on selected compositions. The study indicates that the phase mixtures close to LSC113:LSC21 = 50:50 give the most favorable results.