As the detection method of this sensor involved the oxidation of hydrogen peroxide generated by the reduction of DO, both gold and platinum were evaluated as potential detection materials by comparing the LSV response of both electrodes in 200 µM hydrogen peroxide. Figure shows the oxidation of hydrogen peroxide on one comb of both a gold IDE and a platinum IDE, respectively. The platinum electrode showed a superior oxidation, with a current taken at 0.7 V that was 1.5 times higher than the gold electrode. Interestingly, an oxidation event was seen at 0.2 V on platinum that was absent for gold. This has been attributed to dissociative binding of hydrogen peroxide to the platinum surface, before subsequently being oxidised and released as oxygen. A full calibration of hydrogen peroxide on platinum is shown in the supporting information (SI Fig3 (a) and (b). The appropriate potential for collector electrode biasing was determined from these LSVs. The main peak was observed at 0.65 V for both materials. However, the platinum electrode could be biased at any potential from 0.2 V to 0.7 V and activity would be seen for hydrogen peroxide, which was another advantage over gold. The oxidation event on both materials displayed a peak shaped behaviour. Again, this can be explained by diffusional overlap.