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Enhancing oxygen reduction reaction (ORR) activity and simultaneously reducing usage of noble metal catalysts are significantly important both in fundamental and applied science communities for polymer electrolyte fuel cells (PEFCs). In this work, we confirm the proton conductor (perfluorosulfonic acid, containing -SO3H) can promote the specific activity (Is) of metal catalysts toward ORR. Herein, Pt nanoparticles (NPs) with a small and narrow size distribution are encapsulated with perfluorosulfonic acid through a simple colloidal route. The resulting catalyst obtains about two times (Is) towards ORR than that of the pristine Pt/C. Significantly, the amount of -SO3H groups is controlled by a heat-treatment method to investigate the influence of -SO3H groups on (Is). The results evidence the contribution of -SO3H groups to elevating the ORR specific activity. The mechanism can be ascribed to the -SO3H groups which effectively promote the transfer process of reaction species (e.g., H+, H2O), improving the triple-phase boundary (TPB).
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