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(A) The model of the ring electrode at the tip of capillary used in finite element simulations. The region of the electrode (labeled in red) included the ring electrode at the tip surface (curve b) and an additional Pt region at the capillary tip (curve c). The simulation process followed the procedure reported by White and coworkers (31). (B) The voltammetry collected on the ring electrode and the ring electrode with the Pt lengths of 0.5, 1, 3, 4, and 5 µm.
