The　factors　affecting　the　catalytic　activity　(CA)　of　monodisperse　nanoparticles　(NPs),　including　size,　crystallinity,　shape,　and　high　indexed　facets,　have　been　well-studied　these　past　years;　here,　we　report　that　the　CA　is　significantly　increased　when　monodisperse　Pt　near-spherical　NPs　are　cross-linked　into　Pt　nanowires　(NWs)　using　two　model　catalytic　reactions,　reduction　of　either　nitrophenol　or　potassium　ferricyanide.　In　this　work,　monodisperse　Pt　NPs　or　NWs　were　prepared　by　using　glucose　as　a　surfactant　and　sodium　borohydride　as　a　reducing　agent　in　aqueous　solution　at　room　temperature.　Monodisperse　Pt　NPs　or　Pt　NWs　can　be　obtained　by　simply　controlling　the　molar　ratio,　R,　of　the　sodium　borohydride　to　the　platinum　salt,　[NaBH4]/[Pt4+].　Different　types　of　Pt　NP　or　NW　colloids　were　used　as　catalysts　in　the　catalytic　reactions　above.　The　results　showed　that　the　normalized　rate　constants　of　the　catalytic　reactions　increase　mildly　with　increasing　particle　size　for　the　monodisperse　Pt　NPs,　but　they　drastically　increase　for　the　Pt　NWs　with　a　similar　mean　size　as　compared　with　the　monodisperse　Pt　NP　colloids.　It　is　thus　expected　that　the　large　abundance　of　grain　boundaries,　generated　when　NPs　are　linearly　linked　into　NWs,　may　be　responsible　for　this　enhanced　catalytic　activity.