| http://www.w3.org/ns/prov#value | - er being formed on one side of a gas diffusion layer, and wherein the carbon particles are monolayer carbon nano-horn aggregates in which monolayer carbon nano-horn are aggregated spherically. [0017] A third aspect of the present invention is a method of producing a solid polymer fuel cell with any one of the above-mentioned the solid polymer electrolyte-catalyst combined fuel cell electrodes, whi
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