Three-dimensional dynamic multi-physics modeling and long-term degradation performance analysis of solid oxide fuel cell considering carbon deposition

作     者：Li, Bohan Wang, Chaoyang Liu, Chang Liu, Ming Yan, Junjie 

作者机构：Xi An Jiao Tong Univ State Key Lab Multiphase Flow Power Engn Xian 710049 Peoples R China 

出 版 物：《JOURNAL OF POWER SOURCES》 (J Power Sources)

年 卷 期：2025年第631卷

核心收录：

学科分类：0820[工学-石油与天然气工程] 08[工学] 0807[工学-动力工程及工程热物理] 0805[工学-材料科学与工程（可授工学、理学学位）] 0703[理学-化学] 

基　　金：National Natural Science Foundation of China 

主　　题：Solid oxide fuel cell 3D dynamic model Direct internal reforming Carbon deposition 

摘      要：Carbon deposition is a critical issue in solid oxide fuel cell (SOFC) operations. In this study, a 3D dynamic model of SOFC considering carbon deposition is established and validated to investigate the effects of key operating conditions (i.e., output voltage, operating temperature, and fuel composition) on the long-term power degradation of the cell. Additionally, the total working lifecycle power generation (Ptot) of the cell is calculated for methane molar fractions in the feeding fuel (XCH4) ranging from 0.1 to 0.4, output voltages (U) from 0.6 V to 0.8 V, and operating temperatures (T) from 1003 K to 1043 K. The results indicate that the long-term SOFC operating voltage should exceed the voltage for maximum steady-state power output to achieve higher Ptot. When the power degradation threshold (PDT) equals 0.75, Ptot reaches 2880 kW h/m2 at U = 0.75V, approximately twice that at U = 0.55V. The power degradation process of the cell can be divided into two stages: a rapid degradation stage and a slow degradation stage. Decreasing the operating temperature or reducing XCH4 to regulate PDT to the slow degradation stage can significantly enhance the cell s total working lifecycle power generation. A distinct boundary in X CH4 is observed between high and low P tot . When X CH4 exceeds the boundary value (0.25), the cell s P tot decreases by over 70 %.