Oh, Seol Hee Park, Eun Hui Kim, Hyun-Kyu Kim, Jason Yoon, Hee-Sung Kim, Yeong-Cheol 박선영 Yang, Sungeun Ji, Ho-Il Yoon, Kyung Joong Son, Ji-Won Lee, Jong-Ho 2024-01-19T11:33:27Z 2024-01-19T11:33:27Z 2022-08-04 2022-07 2574-0962 https://pubs.kist.re.kr/handle/201004/114884 Ceria-zirconia solid solution, having superior oxygen storage/release capability and carbon coking resistance, has long been used as a favorable catalyst or supporting material for various catalytic converters and membrane reactors. Recently, rare-earth-doped ceria-zirconia with an additional improvement in its ionic conductivity by doping is attracting attention as a promising electrocatalyst for solid oxide fuel cells (SOFCs). However, despite this promising prospect, the practical usefulness for fuel cell catalysts has not been verified yet. According to our electro-chemical analysis on a Pr-doped CZO (PrCZO)-based anode, the electrochemical performance does not remain stable; instead, the performance rapidly deteriorates over time even though it is initially much better than that of a conventional anode. From the thorough investigations to identify the cause of the rapid deterioration of PrCZO-based anode via computational analyses using density functional theory and defect chemical analysis, it can be concluded that the fast degradation of PrCZO-based anode is mainly due to the inactive substances precipitated on the PrCZO surface caused by the inherent thermodynamic instability and enhanced phase separation kinetics under SOFC operating conditions, where more mobile cationic defects (interstitial cations) are generated and an easier pathway with a lower migration energy is available. English AMER CHEMICAL SOC Exploration of a Ce0.65Zr0.25Pr0.1O2-d-Based Electrocatalyst That Exhibits Rapid Performance Deterioration Despite Its High Oxygen Storage Capability Article 10.1021/acsaem.2c00468 1 ACS Applied Energy Materials, v.5, no.7, pp.8023 - 8033 ACS Applied Energy Materials 5 7 8023 8033 N scie scopus 000830067700001 Chemistry, Physical Energy & Fuels Materials Science, Multidisciplinary Chemistry Energy & Fuels Materials Science Article; Early Access OXIDE FUEL-CELLS SOLID-SOLUTIONS METHANE NICKEL CERIA ZIRCONIA ANODE STABILITY OXIDATION HYDROGEN Ce0.65Zr0.25Pr0.1O2 ceria-zirconia solid solution electrocatalyst performance deterioration phase separation long-term stability