Abstract
Manganese-tungsten oxide electrodes have high efficiency for oxygen evolution in seawater electrolysis. Manganese oxide, tungsten oxide and manganese-tungsten oxides were coated on the IrO 2 -coated titanium (IrO 2 /Ti electrode) by thermal decomposition. The oxygen evolution efficiencies at 200 A . m -2 of the manganese oxide and tungsten oxide electrodes in 0.5 M NaCl solution at pH 8 and 30°C were 70 and 68%, respectively. The efficiency for oxygen evolution is enhanced by small amounts of mutual additions into manganese oxide or tungsten oxide. In particular, the efficiencies of α-Mn 2 O 3 -type oxide with 15 mol% W 6+ and WO 3 -type oxide with 10 mol% Mn 2+ go up to over 92 and 86%, respectively. Further increase in additives leads to the formation of MnWO 4 and to a significant decrease in the oxygen evolution efficiency.
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