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Validation of the hydrodynamic performance of the iRDE setup with HER, a gas-evolving reaction. Limiting currents measured by linear sweep voltammetry (sweep rate 50 mV s–1) on a Pt iRDE in a pH 2.56 HClO4/NaClO4 solution scale linearly with the square root of the rotational rate. The dashed green lines are limiting current predictions of the Levich equation (eq 2), calculated using the diffusion coefficient value mentioned in the text at all of the given rotational rates.
