micrographs of as prepared MnO2 film can be seen, indicating that the surface consists of densely
packed structures with a size range of 10-20 nm. In Figure 4b a MnO2 film after electrochemical test is
shown, which besides appearing slightly less dense, looks very similar to the as prepared sample. In
Figure 4c and 4d the surfaces of two Ti-MnO2 films are shown, one as prepared and one after
electrochemical test respectively. These two films look exactly like the pure MnO2 counterparts and
we therefore conclude that no significant reconstruction is taking place for the two types of thin films
during the stability tests and that the introduced Ti is not changing the overall morphology.
