Limiting Currents for the Reduction of the Tri-iodide Ion at a Rotating Platinum Disk Cathode

Abstract

Limiting currents for the reduction of the tri‐iodide ion have been determined with a rotating platinum disk cathode. The concentration of tri‐iodide ion has been varied over the range 0.124–3.70 mM; the angular velocity of the disk, 50–200 rpm; the temperature, 25.0°–44.7°C; and the kinematic viscosity of the solution 0.00874–0.0555 cm2 sec−1. The results confirm the validity of Levich's theory for Prandtl numbers within the range 350–33,000.