The morphology of all sediments were studied by scanning electron microscopy. Fig. shows the images of MnO2 films deposited from sulfate electrolytes with different pH. The samples were prepared via CV and CA method. The first conclusion from Figure -the pH of the solution and the method of precipitation have a huge impact on the morphology of the electrodeposited manganese dioxide. Images 1-6, 11-14, 19-22 (Fig. ) show the surface of the sediments deposited by the CV method. With this technique, the precipitate is forming and partially dissolved, thus forming active centres. In subsequent cycles, the sediment builds up around these centres. As a result, the MnO2 films form branching networks which provide an extra-large surface area. The precipitates formed at pH 1 can be seen in images 1-6 (Fig. ).