Unifying the ORR and OER with surface oxygen and extracting their intrinsic activities on platinum.

ABSTRACT: Common half-cell measurements deliver oxygen reduction activities linked to the chosen scan rate, limiting their value for fundamental and comparative studies on platinum. Here we show a deconvolution of the intrinsic kinetics from the effect of surface oxygen on platinum. We find an electronic effect of the surface oxygen, substantiate a Tafel slope of ~120 mV/decade, obtain an exchange current density of 13 ± 4 µA/cm², and an activity of 7 mA/cm² at 900 mV. Eventually, we broaden the scope of this analysis to the effects of surface rearrangement, alloying, and supported Pt nanoparticles, the latter providing insight into discrepancies between half-cell and fuel cell measurements. We find through computational methods that binding energies of intermediates would be w

SUBMITTER: Brandes BA 

PROVIDER: S-EPMC11347700 | biostudies-literature | 2024 Aug

REPOSITORIES: biostudies-literature