New type of electrodes of , where the films are prepared by the anodic oxidation accompanied by sparking and are porous, were tested as the anode for the oxygen evolution reaction in acidic solution. The electrodes were prepared by thermal decomposition of aqueous solution on the films. The resistivities of the electrodes themselves became zero by the thermal decomposition process to form , if the films were prepared by the anodic oxidation accompanied by sufficient sparking. It was found that the catalytic activities of the electrodes are higher than that of the electrode. The electrodes prepared at a calcination temperature lower than about 500°C dissolved in the long‐term test, although their surface areas were very large. The electrodes prepared at 550° are very superior in their catalytic activity and their stability in the long‐term test for the oxygen evolution reaction. The surface difference between the and the electrodes is also discussed.