Figure 2. Scanning Electron Microscopy images for a) pure Mn3O4 b) MnOx with 30 % Au and c) MnOx with 50 % Au.
The activities of these films were then characterized with cyclic voltammetry in 1 M KOH using a scan rate of 20
mV/s. For each thin film the activity measurements were repeated three times. In Figure 2a the initial CVs can
be seen and in Figure 2b they are compared at 400 mV overpotential with error bars.