Experimental study on current distribution in parallel-connected solid oxide fuel cell strings
image: Schematic diagram of connection of cells and evaluation system.
Credit: Jia Lu, Qiang Hu & Jian Wu.
Researchers at Zhejiang Agriculture and Forestry University have unveiled groundbreaking insights into the current distribution of parallel-connected solid oxide fuel cell (SOFC) strings. This study, published in Frontiers in Energy, addresses a critical gap in understanding how nonuniformity in SOFC performance affects overall efficiency and operation.
Solid oxide fuel cells (SOFCs) are a promising technology for clean energy generation due to their high efficiency and fuel flexibility. However, to enhance their power output, SOFCs are often connected in stacks, which introduces challenges related to nonuniform cell performance. This nonuniformity, influenced by manufacturing inconsistencies and operating conditions, has been a longstanding issue in the application of SOFC stacks. Until now, the effects of this nonuniformity on parallel-connected SOFCs have been largely unexplored.
The study conducted detailed experiments to analyze current distribution within a stack of SOFCs connected in parallel, considering the principles of electricity and electrochemistry. Researchers identified unique phenomena such as the "self-discharge effect" during standby mode and the "capacity-proportional-load sharing effect" under normal operating conditions. These findings provide valuable insights into how nonuniformity can be managed to optimize SOFC performance.
The researchers employed a combination of experimental setups and theoretical analyses to scrutinize the current distribution in nonuniform parallel-connected SOFC stacks. The study's methodology ensured a comprehensive understanding of the electrochemical interactions and their impact on current flow within the stack.
This research holds significant implications for the development of more efficient and reliable SOFC systems. By understanding and mitigating the effects of nonuniformity in parallel-connected SOFCs, manufacturers can enhance the performance and lifespan of fuel cell stacks. Additionally, the study's methodology and findings could be adapted for other types of fuel cells and energy systems, potentially influencing future innovations in clean energy technology.
The study was supported by the National Key R&D Program of China, the National Natural Science Foundation of China, and the Leading Innovative and Entrepreneur Team Introduction Program of Zhejiang, China. The research team aims to build on these findings with future studies focusing on the application of their results to broader energy systems.
Original source:
https://link.springer.com/article/10.1007/s11708-024-0941-9
https://journal.hep.com.cn/fie/EN/10.1007/s11708-024-0941-9
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