《Table 1 Compositions for preparing the oxide electrodes》

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《Oxygen Evolution Efficiency and Chlorine Evolution Efficiency for Electrocatalytic Properties of MnO_2-based Electrodes in Seawater》

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Thermal decomposition was adopted to prepare an IrO2 coating as an intermediate layer on the titanium substrate[10，15].The IrO2 coating was prepared by the following procedure:first，a precursor of a 0.2 M chloroiridic acid butanol solution was prepared；it was then painted with a brush on the titanium substrates using three coats，which after each coat were dried at100℃for 10 min and then sintered at 450℃for 10min；then，this specimen was finally sintered for 1 h at450℃；the electrodes were then anodically polarized at 1 000 A·m-2 for 10 min in 0.1 M H2SO4 at room temperature to remove any contaminants；finally，Mn，Mn+Mo，Mn+Mo+V，and Mn+Fe+V oxide electrode coatings were prepared on the electrodes by anodic deposition at 90℃with a constant current density of 600 A·m-2 for 60 min.The composition of the resultant oxide electrodes are listed in Table 1.The pH value of the electrolyte was buffered to 0.5 by using concentrated sulfuric acid.Pure（>99.98%）titanium was employed as a counter electrode.