Homogenous Electrocatalytic Oxygen Reduction Rates Correlate with Reaction Overpotential in Acidic Organic Solutions.

ABSTRACT: Improved electrocatalysts for the oxygen reduction reaction (ORR) are critical for the advancement of fuel cell technologies. Herein, we report a series of 11 soluble iron porphyrin ORR electrocatalysts that possess turnover frequencies (TOFs) from 3 s^-1 to an unprecedented value of 2.2 × 10⁶ s^-1. These TOFs correlate with the ORR overpotential, which can be modulated by changing the E_1/2 of the catalyst using different ancillary ligands, by changing the solvent and solution acidity, and by changing the catalyst's protonation state. The overpotential is well-defined for these homogeneous electrocatalysts by the E_1/2 of the catalyst and the proton activity of the solution. This is the first such correlation for homogeneous

SUBMITTER: Pegis ML 

PROVIDER: S-EPMC5126711 | biostudies-literature | 2016 Nov

REPOSITORIES: biostudies-literature