Anodically Deposited Mn-Mo-Fe Oxide Anodes for Oxygen Evolution in Hot Seawater Electrolysis

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Abstract

In order to avoid chlorine evolution on the anode in hot seawater electrolysis, the oxygen evolution anodes were tailored. γ-MnO2-type Mn1−x−yMoxFeyO2+x−0.5y anodes consisting of Mn4+, Mo6+ and Fe3+ were prepared by anodic deposition. The anodes with the 100% oxygen evolution efficiency in the electrolysis of 0.5 kmol m−3 NaCl at pH 12, 353 K and a current density of 1000 Am−2 were prepared in solutions consisting of 0.003 kmol m−3 Na2MoO4, 0.1 kmol m−3 Fe(NH4)(SO4)2 and 0.2 kmol m−3 or higher concentrations of MnSO4 at pH 0.33-0.5, 363 K and a current density of 600 Am−2. In the outside of this range, generally because of lower deposition efficiency, the electrode surface was not completely covered with anodically deposited oxides with a consequent lower oxygen evolution efficiency.

Journal

  • MATERIALS TRANSACTIONS

    MATERIALS TRANSACTIONS 44 (10), 2114-2123, 2003

    The Japan Institute of Metals and Materials

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