Fig. 4

Fig. 4

CV of GCE (0.07 cm2) in agar gel containing 1 mM TCQN (7,7,8,8-tetracyanoquinodimethane) in 0.2 M LiClO4 in acetonitrile: — Pt reference electrode, - - - Ag/AgCl/Cl reference electrode: (a) at 0.005 V s−1; (b) at 0.50 V s−1