Dynamic analysis of current overshoots in reversible solid oxide cells. (11th October 2021)

• Record Type: Journal Article
• Authors: Zong, Zheng; Zhou, Jun; Zhang, Zihang; Zhao, Hongfei; Wang, Junkai; Ma, Wanli; Wu, Kai
• Is Part Of: International journal of hydrogen energy. Volume 46:Number 70(2021)
• Page Start: 34896
• Page End: 34911
• Publication Date: 2021-10-11
• Subjects: Reversible solid oxide cell -- Dynamic response -- Mathematical modeling -- Current density overshoot -- Reversible operation; Hydrogen as fuel -- Periodicals; Hydrogène (Combustible) -- Périodiques; Hydrogen as fuel; Periodicals; 665.81
• DOI: 10.1016/j.ijhydene.2021.08.048
• Languages: English
• ISSNs: 0360-3199

Abstract

Abstract: Reversible solid oxide cell (RSOC) has attracted significant attention due to its multi-functionalities for energy conversion and storage. This device works as a fuel cell (FC) or an electrolyzer cell (EC) with superior efficiency. However, its dynamic response is complex and may cause a large overshoot of current operated in reversible cell mode, which impairs the long-term stability of RSOC. Although several works report the overshoot phenomenon, the mechanism and effects on cell performance are still unclear so far. In this work, we build a 3D dynamic planar RSOC model to investigate the detailed behavior of overshoot. The results show that the overshoot of current for RSOC can be caused under switching mode conditions. Especially a larger overshoot of current can be observed within switching mode from EC to FC. The overshoot of current is mainly caused by the load change, slower gas diffusion, and differentiated temperature distribution in RSOC. Graphical abstract: Image 1 Highlights: The mode-changing can cause a large overshoot of current in RSOCs. A dynamic model of RSOCs is developed to elevate the overshoot and response time. Load sizes, switching time and temperature effect on the dynamic performance. The current overshoot is proportional to the variation of load change.