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Pt nanoparicles supported on a carbon powder Pt-NPs/C were synthesized by a polyol method and modified by grafting of different non-fluorinated and fluorinated proton conducting polymers. In the case of fluorinated polymers, the sulfonyl functions were attached either directly or through spacers (-O-PSA and -S-PSA) to the tetrafluorovinylic groups. Results in three-electrode electrochemical cell...