期刊
ACS APPLIED ENERGY MATERIALS
卷 -, 期 -, 页码 -出版社
AMER CHEMICAL SOC
DOI: 10.1021/acsaem.2c00468
关键词
Ce0.65Zr0.25Pr0.1O2; ceria-zirconia solid solution; electrocatalyst; performance deterioration; phase separation; long-term stability
资金
- Energy Technology Development Program of the Korea Institute of Energy Technology Evaluation and Planning (KETEP) - Ministry of Trade, Industry and Energy, Republic of Korea [20193010032460]
- institutional research program of KIST and the Education and Research Promotion Program of KOREATECH
- Korea Institute of Energy Technology Evaluation & Planning (KETEP) [20193010032460] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
Ceria-zirconia solid solution has been widely used as a catalyst or supporting material due to its superior oxygen storage/release capability and carbon coking resistance. Rare-earth-doped ceria-zirconia with improved ionic conductivity is considered a promising electrocatalyst for solid oxide fuel cells. However, the practical usefulness of Pr-doped CZO-based anode has not been confirmed yet.
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.
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