Abstract
The reaction between the water-soluble cobalt porphyrin 1 and [(NH3)5Os(OH2)]2+ produces a multiply-osmiumated product that spontaneously adsorbs on graphite electrodes and acts as a catalyst for the reduction of O2 by four electrons. The nonosmiumated cobalt porphyrin is also adsorbed but catalyzes only the two-electron reduction of O2.
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