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초록·키워드
Water management is decisive in the commercialisation of Polymer Electrolyte Membrane Fuel cells (PEMFCs) as poor watermanagement leads to reduced performance and reliability. Hence, this work deals with effective water management andphysically examines water removed at cathode outlet in 25 cm2 PEMFC of land width by channel width of 2 × 2. Sixcombinations among flow fields such as parallel without slope, parallel with slope, serpentine and a novel parallel zigzag withslope are used for experimentation. Experimental results disclose that inducing cross flow among reactants, increasingexposure area of uncompressed MEA with reacting gases and backpressure increases the performance while slope at cathodeincreases the water removal rate of PEMFC. The novel flow field when used at the cathode with the serpentine flow field atanode accumulates advantages of the flow fields considered and enhanced the performance by about 23% than conventionalserpentine flow fields due to the induced flow non-uniformity, under rib convection and better water removal rate. Additionally, to enhance the water removal and performance a silicon dioxide based ceramic ink is spray coated on thegraphite plate to increase its hydrophobicity. As the electrical conductivity of silicon dioxide, a key constituent in thehydrophobic coating is limited, a blend of 2% graphene by weight with the ceramic ink is also attempted along with thedurability of these flow fields for twelve hours of continuous operation.
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