Fig. 2. CV curves of rP, cP and their composite electrodes in 1^st, 2^nd, 10^th, and 100^th cycle: (a) rP; (b) rC; (c) cP; (d) cC; (e) their charge loss with cycling. Electrodes are prepared by solution cast of the sample solutions onto ITO. Measurements were performed in 0.1 M TBPO solution in acetonitrile using Ag/AgCl as RE and platinum wire as CE.