3. Results and discussion
3.1. Morphological and electrochemical characterization of the activated CSE
The importance of surface chemistry to the electrochemical properties of carbon electrodes, particularly adsorptive capacity, heterogeneous electron transfer and surface stability, is well established [28], [29], [30] and [31]. Fig. 2 shows typical SEM images of the CSE surface before (A) and after (B) its activation.