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Current vs. time dependencies obtained at an UME tip positioned at a constant distance (about 5 μm) above the cell. Solution contained (A) 0.1 mM KI and (B) 30 μM 1,2-naphthoquinone. Tip potential was (A) 0.64 V and (B) −0.34 V vs Ag/AgCl reference. The arrow indicates when the potential was applied. The tip was (A) 5-μm-radius Pt, and (B) 5.5-μm-radius carbon fiber.
