This study elucidated electrochemical behaviors of an IrO
2-Ta
2O
5/Ti anode and pre-deposited PbO
2 layers of two types on IrO
2-Ta
2O
5/Ti anodes in H
2SO
4 solutions. The onset potential for the reduction of β-PbO
2 of a pre-deposited PbO
2 layer prepared from acidic solutions was more positive than the oxygen evolution potential on the IrO
2-Ta
2O
5/Ti anode. Formation of a non-conductive PbSO
4 film on IrO
2- Ta
2O
5/Ti anodes in copper foil production can be attributed to the formation of a local cell consisting of a PbO
2 cathode and an IrO
2-Ta
2O
5 anode during an open-circuit condition.
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