Abstract
The dynamic response of proton exchange membrane fuel cells with the load switching determines the operation stability and life of fuel cells. To investigate the dynamic response of proton exchange membrane fuel cells from the perspective of gas and water delivery, the dynamic response of the fuel cell with the parallel and orientational flow channels was tested under different loads and operating conditions. The experimental results show that the dynamic performance of the fuel cell with orientational flow channels is good after the current and voltage loads are switched. The orientational flow channels improve water management, make the water distribution of the flow channels uniform, increase the membrane hydration, and prevent flooding in the local electrode. The voltage variation coefficient of the cell with orientational flow channels is 1.57%, which is smaller than that of the cell with parallel flow channels 35.6%. Thus, the dynamic performance and stability are improved. The overshoot and undershoot of pressure drop are observed which is due to the changing of gas transferring to the electrode when the load is switched. The orientational flow channels improve the gas transfer capacity, which makes more gas enter the electrode to participate in reactions, thus the orientational flow channels improve dynamic performance and decrease dynamic time constant.
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