Method for producing catalyst for fuel cells, and fuel cell containing catalyst for fuel cells produced by the production method

A method for producing a catalyst layer for fuel cells, the catalyst layer comprising fine catalyst particles, each of which comprises a palladium-containing core particle, a carbon support on which the palladium-containing core particle is supported, and a platinum-containing outermost layer covering the palladium-containing core particle, wherein the method comprises the ordered steps of:

• preparing the carbon supports on which the palladium-containing core particles are supported;
• applying a solvent to the carbon supports on which the palladium-containing core particles are supported;
• freeze-drying the carbon supports on which the palladium-containing core particles are supported after the applying step;
• fining, by intermittently operating a homogenizer in two second cycles, the carbon supports on which the palladium-containing core particles are supported after the freeze-drying step by stirring the carbon supports on which the palladium-containing core particles are supported until the total operation time reaches 15 minutes with cooling the carbon supports by cooling water at about 6° Celsius;
• and
• covering the fined palladium-containing particles, supported on the fined carbon supports, with the platinum-containing outermost layer after the fining step,
• wherein, after the fining step, the particle size distribution of the carbon supports is an approximately normal distribution and a peak of the particle size distribution is about 10 μm.