Abstract
We investigate the effect of triphenylphosphine triphosphonate, TPPTP, on the electrocatalytic activity for the oxygen reduction reaction (ORR) at ligand-stabilized Pt nanoparticles (Pt 2.1 nm - TPPTP). The Pt 2.1 nm - TPPTP catalyst supported on Vulcan carbon (VC) (Pt 2.1 mm - TPPTP/VC) adsorbs and desorbs oxygen +40 mV vs the potential for bare Pt nanoparticles supported on VC (Pt 2.4 nm /VC), as measured by cyclic voltammetry in Ar-saturated 0.1 M HClO 4 . The area-specific ORR activity (i s ) of Pt in the Pt 2.1 - TPPTP/VC catalyst is -22% higher than that of Pt 2.4 nm /VC, as measured by rotating disk electrode voltammetry. These results suggest that the TPPTP ligand weakens the Pt-O bond, resulting in the observed kinetic enhancement of the ORR.
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