Abstract
The water management problem of fuel cells has been troubled for its further application, and the precision of the existing humidity control strategy is not sufficient to adapt to complex operating conditions. In this study, a new type of porous flow field, based on metal fibers with continuous capillary paths and excellent capillary suction ability, is proposed to retain moisture and enhance the back diffusion of moisture from the cathode to the anode, to achieve self-humidification. These fibers are obtained by turning, and their surface is covered with multi-level microstructure, which greatly increases specific surface area, and the capillary suction capacity of the fibers for water, compared to the ordinary smooth surface structure. Experimental results show that the fiber flow field with an optimal porosity of 70% can operate stably at 50 °C and achieve the best performance when humidified at room temperature. Under atmospheric pressure, the temperature resistance is increased by 5 °C compared to the serpentine flow field, and the limit peak power density is increased by 18.75%.
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