“…The potential of the collector was held at a sufficient voltage to drive the diffusion limited oxidation of RuðNH 3 Þ 2þ 6 , and the generator was stepped to a voltage resulting in a step from zero current to the transport controlled reduction of RuðNH 3 Þ 3þ 6 . A simulation, as described in Section 1.2 and modified using the radius ratio given from single electrode potential-step chronoamperometry, was run using the diffusion coefficient ratio, D R = 1.39, as measured by the double potential-step chronoamperometry by Wang et al [63], and the half-gap ratio, d = 0.20, as obtained from the optical microscopy on the experimental dual microelectrode.…”