Abstract
The behaviour of a new kind of metalloporphyrin catalyst electrode for reduction of oxygen, characterized by a metal and ligand charged (MLC) water soluble metalloporphyrin system and a surface oxidized carbon fibre substrate exhibiting cation exchanger properties, is investigated by cyclic voltammetry and by impedance spectroscopy. Results with Fe- and Co-MLC-metalloporphyrins clearly indicate that they are electrocatalytically active so long as the transition metals exist in their +3 oxidation state. Compared to conventional metalloporphyrin electrodes, which are obtained after adsorption procedures, this new kind of electrode has several advantages, i.e. it bears larger quantity of catalytically active monomeric metalloporphyrin molecules it is more resistant to rinsing and can be reactivated by addition of the metalloporphyrin to the aqueous electrolyte solution. These advantages allow the application of this electrode in fuel cells.
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