Figure 6.

Electrochemically effective area of MWCNT-functionalised SPE determined using 1 mM hexaammineruthenium(III) chloride within a potential window of −500 mV to + 500 mV s⁻¹ in 0.1 M KCL vs. Ag/AgCl reference electrode. (A) Cyclic voltammograms were recorded at increasing scan rates of 5 mV s⁻¹, 10 mV s⁻¹, 15 mV s⁻¹, 25 mV s⁻¹, 50 mV s⁻¹, 75 mV s⁻¹, 100 mV s⁻¹, 150 mV s⁻¹, 250 mV s⁻¹, and 500 mV s⁻¹ (increasing scan rate corresponds to increasing distance between forward and reverse scans). (B) Linearity of peak current vs square root of the scan rate with R² of 0.995. (C) Log of peak current as a function of log scan rate used to determine gradient for a diffusion controlled electrochemical process.