Abstract
Combination of multiwalled carbon nanotubes, cobalt porphyrin and tungsten oxide produces a multifunctional electrocatalytic system capable of the effective reduction of oxygen in acid medium. The resulting inks have been utilized during sequential deposition of components. Co-existence of Co-porphyrin, tungsten oxide together with dispersed carbon nanotubes leads to synergistic effect that is evident from positive shift of the oxygen reduction potentials, significant increase of voltammetric currents (relative to those observed at a system not containing carbon nanotube-supported tungsten oxide) and decrease of hydrogen peroxide produced during oxygen reduction. It is reasonable to expect that the reduction of oxygen is initiated at metalloporphyrin redox centers, and the undesirable hydrogen peroxide intermediate is further reduced at partially reduced tungsten oxide. In addition to the methanol tolerance other important issue is the tolerance of the proposed system to ethanol that may appear due to crossover in the cathode compartments of ethanol fuel cells.
Published Version
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