For proton exchange membrane fuel cell (PEMFC) power supply system after shutdown

fuel cell open circuit high voltage is considered to be an important factor causing low battery performance and shortened life. This is mainly because after shutdown of PEMFC power system

fuel cell is in an open state. Residual hydrogen on the anode side reacts with air on the cathode side and the battery is at open circuit high voltage which is maintained for a long time. It is easy to cause oxidation of catalyst carbon carrier and shedding of distributed platinum (Pt) particles

and consequently decayed fuel cell performance and shortened life expectancy. Aiming at minimizing the time of shutdown open circuit high voltage and accelerating consumption of residual hydrogen on the anode

a shutdown strategy of PEMFC power system was proposed

and the influence of direct shutdown and shutdown strategy on PEMFC output characteristics was studied through experiments. The effectiveness of the shutdown strategy was verified

and references guidance was provided for protective shutdown strategy of PEMFC power system.