Proton-Coupled Oxygen Reduction at Liquid-Liquid Interfaces Catalyzed by Cobalt Porphine
Cobalt porphine (CoP) dissolved in the organic phase of a biphasic system is used to catalyze O2 reduction by an electron donor, ferrocene (Fc). Using voltammetry at the interface between two immiscible electrolyte solutions (ITIES), it is possible to drive this catalytic reduction at the interface as a function of the applied potential difference, where aqueous protons and organic electron donors combine to reduce O2. The current signal observed corresponds to a proton-coupled electron transfer (PCET) reaction, as no current and no reaction can be observed in the absence of either the aqueous acid, CoP, Fc, or O2.
Keywords: Scanning Electrochemical Microscopy ; Immiscible Electrolyte-Solutions ; Ferrocene Derivatives ; Liquid/Liquid Interfaces ; Polarized Interface ; Graphite-Electrodes ; Molecular-Oxygen ; Perchloric-Acid ; O-2 Reduction ; Dioxygen
Record created on 2010-01-06, modified on 2016-08-08