(a)
(b)
(c)
Figure 6: (a) Typical amperometric technique (-) curve of different modified electrodes (with different Mg concentrations (mole ratio): 1%, 2%, 4%, and 6%) after adding H2O2 in stirred solution of 0.1 M PBS; (b) calibration plot of response current versus H2O2 concentration of different modified electrodes (with different Mg concentrations (mole ratio); 1%, 2%, 4%, and 6%); (c) the sensitivity of different electrodes.