Exploration of a Ce0.65Zr0.25Pr0.1O2−δ-Based Electrocatalyst That Exhibits Rapid Performance Deterioration Despite Its High Oxygen Storage CapabilityClick to copy article linkArticle link copied!
- Seol Hee OhSeol Hee OhEnergy Materials Research Center, Korea Institute of Science and Technology, Seoul 02792, KoreaMore by Seol Hee Oh
- Eun Hui ParkEun Hui ParkEnergy Materials Research Center, Korea Institute of Science and Technology, Seoul 02792, KoreaDepartment of Energy Engineering, Hanyang University, Seoul 04763, KoreaMore by Eun Hui Park
- Hyun-Kyu KimHyun-Kyu KimSchool of Energy Materials and Chemical Engineering, Korea University of Technology and Education, Cheonan 31253, KoreaMore by Hyun-Kyu Kim
- Jason KimJason KimDepartment of Convergence IT Engineering, Pohang University of Science and Technology, Pohang 37673, KoreaMore by Jason Kim
- Hee-Sung YoonHee-Sung YoonDepartment of Energy Engineering, Hanyang University, Seoul 04763, KoreaMore by Hee-Sung Yoon
- Yeong-Cheol KimYeong-Cheol KimSchool of Energy Materials and Chemical Engineering, Korea University of Technology and Education, Cheonan 31253, KoreaMore by Yeong-Cheol Kim
- Sun-Young ParkSun-Young ParkTechnology Support Center, Korea Institute of Science and Technology, Seoul 02792, KoreaMore by Sun-Young Park
- Sungeun YangSungeun YangEnergy Materials Research Center, Korea Institute of Science and Technology, Seoul 02792, KoreaDivision of Nanoscience & Technology, University of Science and Technology, Seoul 02792, KoreaMore by Sungeun Yang
- Ho-Il JiHo-Il JiEnergy Materials Research Center, Korea Institute of Science and Technology, Seoul 02792, KoreaDivision of Nanoscience & Technology, University of Science and Technology, Seoul 02792, KoreaMore by Ho-Il Ji
- Kyung Joong YoonKyung Joong YoonEnergy Materials Research Center, Korea Institute of Science and Technology, Seoul 02792, KoreaMore by Kyung Joong Yoon
- Ji-Won SonJi-Won SonEnergy Materials Research Center, Korea Institute of Science and Technology, Seoul 02792, KoreaDivision of Nanoscience & Technology, University of Science and Technology, Seoul 02792, KoreaMore by Ji-Won Son
- Jong-Ho Lee*Jong-Ho Lee*Email: [email protected]Energy Materials Research Center, Korea Institute of Science and Technology, Seoul 02792, KoreaDivision of Nanoscience & Technology, University of Science and Technology, Seoul 02792, KoreaMore by Jong-Ho Lee
Abstract
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 electrochemical 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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This article is cited by 2 publications.
- Tom L. Underwood, Susanna Vigorito, Marco Molinari, John Purton, Nigel B. Wilding, John T.S. Irvine, Stephen C. Parker. Grain-boundary-dependent segregation and phase separation in ceria–zirconia from atomistic simulation. Acta Materialia 2024, 271 , 119872. https://doi.org/10.1016/j.actamat.2024.119872
- Seol Hee Oh, Hyun-Kyu Kim, Jason Kim, Yeong-Cheol Kim, Sun-Young Park, Sungeun Yang, Ho-Il Ji, Kyung Joong Yoon, Ji-Won Son, Jong-Ho Lee. Experimental and theoretical study on the complete phase separation of ceria-zirconia solid solution into two end members, ceria and zirconia. Journal of Physics: Energy 2022, 4
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, 045004. https://doi.org/10.1088/2515-7655/ac8a76
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