Ion conducting layer for fuel cells suppressing crossover phenomenon and fuel cell comprising the same

An ion conducting layer for fuel cells, through which ions generated by oxidation of liquid fuel pass before the ions reach a membrane in a fuel cell, the ion conducting layer comprising:

• a substrate into which the liquid fuel and an electrolyte are introduced;
• and
• pores formed in the substrate,
• wherein the ion conducting layer is disposed between a fuel electrode layer and the membrane,
• wherein the pores are formed at a porosity of 10% or more in the substrate to suppress a crossover phenomenon in which the liquid fuel passes through the membrane, and
• wherein the ion conducting layer is coupled to the fuel electrode layer and configured to receive a mixture of the liquid fuel and the electrolyte from the fuel electrode layer so as to embed the substrate of the ion conducting layer in the electrolyte to secure mobility of ions.