| http://www.w3.org/ns/prov#value | - 056] The structure made of the porous carbon substrate having fine metal particles dispersed therein which can be used in the present invention is a structure made of the porous carbon substrate having at least one kind of fine metal particles dispersed therein. [0057] The fine metal particles preferably have an average particle size of 5 nm or smaller and a maximum particle size of 15 nm or small
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