Electrode for fuel cell, fuel cell system comprising the same, and method for preparing the same

A membrane-electrode assembly for a fuel cell, comprising a polymer electrolyte membrane, and

• electrodes positioned on both sides of the polymer electrolyte membrane, where the electrodes comprise:
• a carbonaceous electrode substrate;
• a microporous layer on the surface of the electrode substrate, said microporous layer comprising a carbonized polymer;
• and
• a nano-carbon and catalyst layer, comprising nano-carbon on a surface of the microporous layer with a catalyst layer on the surface of the nano-carbon.

A fuel cell system comprising:

• at least one electricity generating unit comprising:
• a membrane-electrode assembly comprising a polymer electrolyte membrane;
• electrodes positioned on both sides of the polymer electrolyte membrane, wherein at least one electrode comprises a carbonaceous electrode substrate and a microporous layer on the surface of the electrode substrate, said microporous layer comprising a carbonized polymer, nano-carbon on the surface of the microporous layer, and a catalyst layer on the surface of the nano-carbon;
• separators on both sides of the membrane-electrode assembly;
• a fuel supplying unit for supplying hydrogen or fuel including hydrogen to the electricity generating unit;
• and
• an oxidant supplying unit for supplying oxygen to the electricity generating unit.

A method of preparing an electrode for a fuel cell, comprising:

• forming a microporous layer on a surface of a carbonaceous electrode substrate;
• heat-treating the carbonaceous electrode substrate with the microporous layer to carbonize a polymer in the microporous layer;
• introducing a first catalyst for synthesizing nano-carbon on the surface of the microporous layer;
• providing a reactive gas including a carbon source gas on the first catalyst to grow nano-carbon;
• and
• coating a second catalyst on the nano-carbon to form a second catalyst layer.