KCS

The influence of polymeric cobalt-tetrakis(2-aminophenyl)porphyrin (CoTAPP)-Pd films on the kinetics of dioxygen reduction was investigated using SWCNT/Nafion coated glassy carbon electrode (GCE). A rotating ring-disk electrode (RRDE) technique was used to determine kinetic parameters for O2 reduction and to detect intermediate H2O2 formation. Kinetic parameters such as the kinetic current, Tafel slope, potential dependence of the ratio of the direct 4-electron reduction to the series 2-electron reduction were determined in 0.1 M H2SO4. The kinetic data showed the clear evidence of the enhancement effects of SWCNT/Nafion coating on the cathodic O2 reduction at GCE. This suggested that our proposed modified electrode Nafion/CoTAPP-Pd/SWCNT/GCE is good candidate for catalytic reduction of dioxygen.