Fig. 2

a CVs of DBT–CNT/GCE in phosphate buffer (pH 7.0, 0.1 M) at scan rates of 10 (1), 20 (2), 40 (3), 60 (4), 100 (5), 130 (6), 200 (7), 250 (8), 400 (9), 600 (10), 700 (11), 900 (12), 1200 (13), 1600 (14), and 1800 (15) mVs−1. b Variations in I p with scan rate. c Variations in E p with logarithm of scan rate. d Magnification of the same plots for high scan rates