Patent ID: 8329347

Claim:
A fuel cell system, comprising: a fuel cell having an electrolyte membrane disposed between a pair of electrodes, a pair of diffusion medium layers, and a pair of electrically conductive fuel cell plates, the electrodes configured to receive a humidified fluid; and a water vapor transport device in fluid communication with the fuel cell, the water vapor transport device including a wet flow field layer having a coarse microtruss structure disposed between a pair of fine microtruss structures, the wet flow field layer formed from a radiation-sensitive material and adapted to facilitate a flow of a wet fluid therethrough, a dry flow field layer having a coarse microtruss structure disposed between a pair of fine microtruss structures, the dry flow field layer formed from a radiation-sensitive material and adapted to facilitate a flow of a dry fluid therethrough, and a membrane disposed between the wet flow field layer and the dry flow field layer, the membrane adapted to permit a transfer of water vapor therethrough from the wet fluid to the dry fluid.