Fig. 3.

Cyclic voltammogram of the responses of different electrodes (different color lines) to PNP (0.6 mmol/L) in Tris buffer solution (0.5 mol/L, pH 8.5) with a potential range of 0.2 to 1.1 V at a scan rate of 0.05 V/s

Note: for interpretation of the references to color in this figure legend, the reader is referred to the web version of this article