摘要：Noble metals are downsized to nano-/subnanoscale to improve their catalytic activity and ***,the stabilities in chemical state and catalytic performance of these nanocatalysts often suffer during harsh *** Pt nanoparticles(NPs)supported on CeO2,activated oxygen diffused from the support over-stabilizes the active sites of Pt,degrading its performance at mild *** this work,Pt nanocatalysts with unique structure of triple-junction are synthesized by selectively growing Pt NPs on the carbon-CeO2 ***,the Pt NPs exhibit much enhanced catalytic stability and high activity for CO oxidation at mild *** enhancement is attributed to electron donation from graphitized carbon and the confinement effect from the high-density nanopores of the CeO2 *** triple-junction of Pt-C-CeO2,combining the merits of CeO2 for activating O2 and electron donating capability of carbon,provides new inspiration to the fabrication of high-performance nanocatalysts.