ADW samples saturated with oxygen were used to determine which metal, Au or Pt, produced higher quantities of hydrogen peroxide. Both metals have the ability to sufficiently oxidise hydrogen peroxide, therefore Au-Au and Pt-Pt Generator -Collector arrays were used for this analysis. CV analysis using the same parameters described in the previous section was undertaken. The only adjustment made being the biasing of the collector electrode comb at 0.4 V vs. Ag/AgCl.