A model for oxidation-induced stress analysis of Ni-based anode-supported planar solid oxide fuel cell. (21st June 2019)

• Record Type: Journal Article
• Authors: Shang, Shuaipeng; Lu, Yongjun; Cao, Xinlei; Song, Xu; Shi, Mingliang; Wang, Fenghui
• Is Part Of: International journal of hydrogen energy. Volume 44:Number 31(2019)
• Page Start: 16956
• Page End: 16964
• Publication Date: 2019-06-21
• Subjects: Solid oxide fuel cell -- Oxidation-induced stress -- Re-oxidation -- Failure probability; Hydrogen as fuel -- Periodicals; Hydrogène (Combustible) -- Périodiques; Hydrogen as fuel; Periodicals; 665.81
• DOI: 10.1016/j.ijhydene.2019.04.166
• Languages: English
• ISSNs: 0360-3199

Abstract

Abstract: A critical hurdle in realizing commercially viable anode-supported solid oxide fuel cell (SOFC) is the re-oxidation of cermet anode during the cell abnormal operation. In this paper, the analysis of energy dispersive X-ray spectroscopy on a partially oxidized half-cell demonstrates a particular inhomogeneous oxidation mechanism that a portion of anode near the air/anode interface is oxidized with a graded NiO content, while the remaining region hold a reduced status. Based on this observation, an analytical oxidation-induced stress model is developed to provide in-depth information about the mechanical behavior of the half-cell suffered from various oxidation. The dependences of the mechanical performance of half-cell on the NiO distribution and thickness of oxidation-graded zone are revealed. The results show that an increase in oxidation-graded zone elevates the stress level of electrolyte, but decreases the curvature under the same global degree of oxidation (DoO). In addition, the influence of thickness of oxidation-graded zone on the electrolyte failure probability is also investigated. According to these results, we conclude that the thickness of oxidation-graded zone should be as thin as possible in order to delay the electrolyte cracking. Highlights: The experiment of measuring NiO-YSZ content distribution is carried out. An analytical oxidation-induced stress model is performed. The failure probability of electrolyte is investigated. The thickness of oxidized graded zone should be as thin as possible.