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CoO2 was formed by anodic treatment of Co (OH)2 deposited on a platinum electrode in a borate buffer at +600-+900 mV (vs. SCE). Anodic polarization of a cobalt electrode at +900 mV yielded a mixture of p-CoOOH and COO2. Exposure of CoO2 to air for 3 months resulted in decomposition to CocO4.In previous studies of the passivation and anodic emission MJssbauer spectroscopy, evidence was found oxidation of cobalt in borate buffer (pH 8.5) using for Co(IV) 1 in the surface film formed at high anodic 9 Electrochemical Society Active Member. l In these studies the M~ssbauer spectra are from the ~TFe Key words: M~fssbauer spectroscopy, cobalt dioxide (CoO~), codaughter isotopes that result from electron capture decay in the bait, anodic oxidation. 57Co parent isotope.Publication costs of this article were assisted by Lehigh University.

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