Repetitive cyclic voltammetry at 0.1V s −1 of a glassy carbon electrode (GCE) in equivalent 1 mM of K3[Ir(CN) 6] and FeCl 3 in 50 mM KCl/HCl (pH = 2). Scan started at −0.20 V vs. Ag/AgCl

1A Plot of anodic peak current (ipa) vs. number of cycles

1B Anodic peak potential (Epa) vs. number of cycles