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Cyclic voltammograms of 1.0 mM Ru(NH3)63+ recorded at a 7 μm diameter carbon fiber tip in bulk solution (solid line) and 2 μm above a conducting substrate (dashed line) held at an oxidizing potential of +0.4 V (A–C) and at a reducing potential of −0.4 V (D–F). Voltammograms were recorded at (A,D) 10 Vs−1; (B,E) 100 Vs−1; (C,F) 1000 Vs−1.
