Seo, Han Gil Kim, Dong Hwan Seo, Jongsu Jeong, Seung Jin Kim, Jinwook Tuller, Harry L. Son, Ji-Won Jung, WooChul 2024-01-19T11:00:52Z 2024-01-19T11:00:52Z 2022-09-15 2022-11 1614-6832 https://pubs.kist.re.kr/handle/201004/114429 A major challenge to overcome in demonstrating solid oxide fuel cells (SOFCs) to be suitable as efficient and environmentally friendly energy conversion devices capable of addressing pressing clean energy and environmental needs is to surmount chemical and thermo-mechanical instabilities in their operational phase. To date, perovskite-based mixed conducting cathodes, which include inherent Co and Sr elements for enhanced reactivity and conductivity, have been intensively studied. These Co/Sr-based oxides, however, exhibit severe thermochemical expansion and suffer from Sr surface segregation, ultimately degrading the electrode performance. Here, high-performance and durable SOFCs are demonstrated by employing a Co/Sr-free fluorite-based mixed conducting (Pr,Ce)O2-delta (PCO) cathode eminently compatible with fluorite-based solid electrolytes. The nanocolumnar PCO electrode developed in this study provides not only a remarkable low level of electrode resistance (e.g., approximate to 0.05 ohm cm(2) at 600 degrees C) but also exceptional long-term stability (e.g., a degradation rate 15 times slower compared to the state-of-the-art La0.6Sr0.4CoO3-delta perovskite). The competitive peak power densities of an anode-supported single cell with the PCO cathode are also successively achieved, recording a value of 0.92 W cm(-2) at 600 degrees C. These findings herald the development of new Co/Sr-free electrodes for SOFCs at intermediate temperatures. English Wiley-VCH Verlag High-Performance and Durable Fuel Cells using Co/Sr-Free Fluorite-Based Mixed Conducting (Pr,Ce)O2-delta Cathode Article 10.1002/aenm.202202101 1 Advanced Energy Materials, v.12, no.43 Advanced Energy Materials 12 43 N scie scopus 000851235600001 Chemistry, Physical Energy & Fuels Materials Science, Multidisciplinary Physics, Applied Physics, Condensed Matter Chemistry Energy & Fuels Materials Science Physics Article; Early Access OXYGEN-EXCHANGE KINETICS SURFACE SR SEGREGATION THIN-FILM CATHODES THERMAL-EXPANSION DOPED CERIA PEROVSKITE OXIDES PRASEODYMIUM REDUCTION SOFC CO (Pr Ce)O (2) Co Sr-free mixed conducting oxides nanocolumnar structures oxygen reduction reaction solid oxide fuel cells