System mitigated strategies on fuel cell degradation of start/stop procedure

摘要

The improvement of fuel cell system lifetime is a key factor of commercialized fuel cell vehicle. The fuel cell degradation issues of vehicle application are related to dynamic load change, start/stop procedure, idle and high load operational modes [1]. Y. Yu et al. [2] reviewed the degradation effect which caused by the start up and shut down (SUSD) procedure. The "reversed current" mechanism induces the high local cell voltage and results in carbon corrosion or water electrolysis on cathode electrode. With system mitigated strategies, such as gas purge, shunt short circuit and control of procedure time, the cycle numbers of SUSD could be improved to 1,000. M.L. Perry [3] proposed potential control operation can improve the SUSD cycles to 12,000 with limited fuel cell degradation. This research investigates a single cell test at different SUSD control program, for example, to use vacuum pump, gas purge, shunt voltage control and other process control strategy, so that the fuel cell SUSD frequency can up to 10,000 times for vehicle application.