Abstract
Polymer electrolyte fuel cell (PEFC) has advantages because of less environmental impact and high system efficiency. It is expected to use many applications such as fuel cell vehicles, residential fuel cell systems. However, there are many technical problems to overcome for the practical use of fuel cells. In particular, it is important to improve the system reliability and the stack failure diagnosis. In this study, PEFC stack performances and effects of cooling failure were investigated. From the result, voltage deviations were calculated in consideration of the Nernst loss caused by the hydrogen partial pressure loss. From the results of a cooling failure test, the plugged cell temperature increased by 8.65℃ at 33 A. The voltage of plugged cell increased on the cooling failure test, though the stack voltage dropped.
