Fig. 5. Cyclic voltammograms as a function of pH and plots of the first reductive peak potential (E p,c(1)) vs. pH for 1-Co, 2-Co, and 3-Co. Conditions: 0.9 mM catalyst, 0.03 M buffer, 0.1 M KNO3, 100 mV s–1 scan rate, glassy carbon electrode (3 mm dia). Note: CV at pH 7 is omitted for clarity in series of CVs for 1-Co. Legend: pH 3 (black), pH 4 (red), pH 5 (green), pH 6 (blue), pH 7 (cyan), pH 8 (magenta).
