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최시혁 한국세라믹학회 2020 한국세라믹학회지 Vol.57 No.4
A direct utilization of hydrocarbon fuels in solid-oxide fuel cell (SOFC) has been considered a worthwhile and realizable goal. Admittedly, while great strides have been made toward this development goal, there still remain Ni-based anode materials issues to be resolved. In this regard, this study focuses on Sr eff ect on electrical and electrochemical behaviors in PrBaMn 2 O 5+ δ (PBM) to be employed as an anode in SOFC operation under hydrogen and hydrocarbon fuels. The electrical conductivity of A-site layered PrBa 0.8 Sr 0.2 Mn 2 O 5+ δ (PBSM) oxide reaches 3.74 S cm −1 at 800 °C in H 2 , which is higher than that of PBM due to doping smaller Sr into Ba site and fully meets the requirement to be employed as an anode material. The electrochemical performance is evaluated using La 0.9 Sr 0.1 Ga 0.8 Mg 0.2 O 3− δ electrolyte-supported cell based on A-site layered PBSM anode with Co–Fe catalysts, and shows peak power density around 1.38 and 0.68 W cm −2 at 800 °C in H 2 and C 3 H 8 , respectively. Considering the electrical and electrochemical properties, A-site layered PBSM might off er the opportunities to discover and explore new high-performance anode material for direct hydrocarbon SOFCs.
Electrochemical Properties of La4Ni3O10-GDC Composite Cathode by Facile Sol-gel Method for IT-SOFCs
최시혁,김건태 한국세라믹학회 2014 한국세라믹학회지 Vol.51 No.4
Among the Ruddlesden-Popper series, La4Ni3O10 has received widespread attention as a promising cathode material by reasonof its favorable properties for realizing high performance of intermediate temperature solid oxide fuel cells (IT-SOFCs). TheLa4Ni3O10 cathode is prepared using the facile sol-gel method by employing tri-blockcopolymer (F127) to obtain a single phase in ashort sintering time. There are no reactions between the La4Ni3O10 cathode and the Ce0.9Gd0.1O2-δ (GDC) electrolyte upon sinteringat 1000oC, indicating that the La4Ni3O10 cathode has good chemical compatibility with the GDC electrolyte. The maximumelectrical conductivity of La4Ni3O10 reaches approximately 240 S cm−1 at 100oC and gradually decreases with increasing temperatureinair atmosphere. The area specific resistance value of La4Ni3O10 composite with 40 wt% GDC is 0.435 Ω cm2 at 700oC. Thesedata allow us to propose that the La4Ni3O10-GDC composite cathode is a good candidate for IT-SOFC applications.