When the direction of the potential sweep was reversed (i.e. the sweeps goes from +0.2 V towards more positive potentials), the same electrochemical response was obtained in the anodic range as described in Figure . However, the electrochemical response below +0.4 V was completely different (compared to Figure ). As a result of the TDMQ20 oxidation, a new product was formed, which undergoes a two-step redox reaction. Therefore, two reduction (Ered' =+0.02 V and Ered'' = -0.1 V) and two oxidation (Eox' =+0.20 V and Eox'' =+ 0.09 V) peaks were present in the CVs (Figure ). The differences between the anodic and the cathodic peaks potentials, |Eox'-Ered'| = 180 mV and |Eox''-Ered''| = 190 mV suggest that both processes exhibited slow kinetics.