demonstrated that the crossover rate is dependent on the current density of the electrolysis cell, exhibiting an increasing trend with an increased current density. 14 The reason has been found to be predominantly a supersaturated hydrogen concentration near the catalyst particle within the aqueous domain of the ionomer film. 14 Subsequently, it was discussed that the cathode I/C ratio has a large influence on the rate of hydrogen permeation. 15 , 16 For example, a higher I/C ratio yields a thicker ionomer film, which extends the length of the diffusion pathways required for the produced dissolved hydrogen to reach the pore space.
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Cathode Catalyst Layer Design in PEM Water Electrolysis toward Reduced Pt Loading and Hydrogen Crossover.
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