Abstract
During the operation of proton exchange membrane fuel cell, Pt particles in the catalytic layer inevitably dissolve into the membrane, which affects the performance of fuel cell. In this work, molecular dynamics is employed to investigate the effect of the redeposition of Pt particles on gas diffusion and solvation characteristics in the hydration membrane. Gas diffusion, hydrophilic cluster and its connectivity are analyzed. The interaction between Pt particles, Nafion membrane and water molecules is discussed. The influence of Pt particles on the thermal conduction of membrane is also evaluated. The results demonstrate that the presence of Pt particles affects the solvation effect of membrane, leading to a weak water cluster connectivity of membrane, which in turn leads to a poor gas diffusion performance. In addition, the thermal conductivity gradually deteriorates during the redeposition of Pt particles.
Published Version
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