The effects of nanocomposites on the electrocatalytic properties were examined after 1000 accelerated cycles (up to vs normal hydrogen electrode). The nanocomposites exhibited similar electrocatalytic properties to without any initial degradation, and also showed enhanced long-term stabilities. By optimizing the synthetic conditions of nanocomposites, the well-dispersed nanoparticles played important roles in preserving the Pt surface activities, by preventing both the dissolution and agglomeration of Pt nanoparticles.
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