Figure 3.

(a) Forward scan of CVs on the Pt NP-BDD ring in 0.1 M HClO₄ with increasing concentrations of H₂O₂ from 0.00 to 3.37 mM. Dotted line: the potential chosen (1.00 V) for the ring in H₂O₂ generation-collection experiments. (b) Pre-ORR i–t calibrations for H₂O₂ recorded on the Pt NP-BDD ring of the RRDE, with a BDD disk electrode, rotated at 2000 rpm. The Pt NP-BDD ring electrode was held at 1.00 V vs SCE and H₂O₂ added via standard addition. The current over the last 5 s was averaged to give the calibration plot in SI11.