Four-electron electrocatalytic reduction of dioxygen to water by an ion-pair cobalt porphyrin dimer adsorbed on a glassy carbon electrode

An ion-pair porphyrin dimer, formed by reacting the tetrachloro salt of [tetrakis(N-methylpyridyl)porphyrinato]- cobalt and the tetrasodium salt of [tetrakis(4-sulfonatophenyl)porphyrinato]cobalt, adsorbed electrochemically on a glassy carbon electrode is shown to catalytically reduce O2 to water by four electrons.