Fuel cell

A fuel cell which comprises at least one gas diffusion electrode, said gas diffusion electrode comprising an electron-conductive, gas-permeable substrate and an electrode catalyst uniformly distributed on the substrate, the electrode catalyst comprising colonies each consisting of not more than about 20 primary particles of noble metal, with each particle having a size of 10-30 A, and the colonies being uniformly distributed and deposited on carrier powder;

• said electrode catalyst being prepared by adding a reducing agent to an aqueous solution containing ions of said noble metal or complex ions of said noble metal, a hydrophillic polymer compound, and the carrier powder, thereby depositing the primary particles of the noble metal onto the carrier powder as said colonies.

A fuel cell which comprises at least one gas diffusion electrode, said gas diffusion electrode comprising an electron-conductive, gas-permeable substrate and an electrode catalyst uniformly distributed on the substrate, the electrode catalyst comprising colonies each consisting of not more than about 20 primary particles of noble metal, with each particle having a size of 10-30 A, and said colonies being uniformly distributed and deposited on carrier powder;

• said electrode catalyst being prepared by adding a reducing agent and carbon fluoride to an aqueous solution containing ions of the noble metal or complex ions of the noble metal, a hydrophillic polymer compound, and the carrier powder, thereby depositing the primary particles of the noble metal onto the carrier powder.

A fuel cell which comprises at least one gas diffusion electrode, said gas diffusion electrode comprising an electron-conductive, gas-permeable substrate comprised of carbon fibers and an electrode catalyst uniformly distributed on the substrate, the electrode catalyst comprising colonies each consisting of not more than about 20 primary particles of noble metal, with each noble metal particle having a size of 10-30 A, and said colonies being uniformly distributed and deposited on carrier powder comprised of carbonaceous powder and from about 0.1-20% by weight of the noble metal, on the basis of the carrier powder, being deposited from an aqueous solution containing ions of the noble metal or complex ions of the noble metal, a reducing agent, a hydrophillic polymer compound and the carrier powder.

A fuel cell which comprises at least one gas diffusion electrode, said gas diffusion electrode comprising an electrode-conductive gas-permeable substrate of carbon paper and an electrode catalyst uniformly distributed on the substrate, the electrode catalyst comprising colonies each consisting of not more than about 20 primary particles of noble metal, with each particle of noble metal having a size of 10-30 A, and the colonies being uniformly distributed and deposited on carrier powder comprising carbonaceous powder;

• the content of said noble metal being 0.1-20% by weight based on the carrier powder.