Ultrathin Atomic Layer-Deposited CeO₂ Overlayer for High-Performance Fuel Cell Electrodes
2019
Shin, Jeong Woo | Oh, Seongkook | Lee, Sungje | Yu, Jin-Geun | Park, Joonsuk | Go, Dohyun | Yang, Byung Chan | Kim, Hyong June | An, Jihwan
Obtaining a catalyst with high activity and thermal stability is essential for high-performance energy conversion devices operating at an elevated temperature. Herein, the design and fabrication of a heterogeneous catalyst with an ultrathin CeO₂ overlayer via atomic layer deposition (ALD) on Pt electrodes for low-temperature solid oxide fuel cells (LT-SOFCs) is reported. The cell with a CeO₂-overcoated (five ALD cycles) Pt cathode shows lower activation resistance by 50% after a 10 h operation and higher thermal stability by a factor of 2 compared with the cell with a Pt-only cathode, which is known to be the best single catalyst at 450 °C. Eventually, a thin-film SOFC with a highly active and stable CeO₂-overcoated cathode based on an anodized aluminum oxide (AAO) substrate demonstrates a high peak power density of 800 mW cm–² at 500 °C, which is the highest performance ever reported for an AAO-based SOFC at this temperature.
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