▎ 摘　　要

NOVELTY - A platinum cluster comprises platinum particles supported by carbon material containing graphene. The platinum particles have particle diameter of 1 nm or less. USE - Platinum cluster is used as highly active catalyst for electrode used for capacitor and fuel cell used in electric-power generating apparatus, electric vehicle and notebook personal computer. ADVANTAGE - The platinum cluster is manufactured economically, and has high electrode activity. The fuel cell having electrode containing platinum cluster has excellent durability and carbon monoxide-proof characteristics. DETAILED DESCRIPTION - INDEPENDENT CLAIMS are included for the following: (1) control method of platinum particles in platinum cluster, which involves supporting platinum particles having magnitude of less than 1 nm on the surface of carbon material comprising layered graphene or two or more-fold graphene synthesized by peeling monoatomic graphite layer from graphite; and (2) manufacture of platinum cluster, which involves mixing platinum solution containing precursor of platinum particles with carbon material comprising layered graphene or two or more-fold graphene, evaporating solvent of platinum solution, and heat-processing the mixture at 300-500 degrees C for 1-10 hours in reduced environment.