Electrochemical Behavior of K3[Fe(CN)6] on the Electrode Coated with Modified Multi‐Walled Carbon Nanotubes

The electrochemical behavior of K3[Fe(CN)6] was studied on an ITO electrode that was coated with β‐cyclodextrin (CD) modified multi‐walled carbon nanotubes (MWNTs) and with carboxyl modified multi‐walled carbon nanotubes (MWNT‐COOHs). MWNT‐COOHs showed an excellent electrocatalytic effect on the redox of K3[Fe(CN)6] while MWNT‐CDs had a subdued effect on the electrochemical response of K3[Fe(CN)6]. It is probably due to mismatching between K3[Fe(CN)6] and cyclodextrin, which hampers the contact of K3[Fe(CN)6] with carbon nanotubes. Moreover, the electrochemical behavior of K3[Fe(CN)6] on the MWNT‐COOHs coated ITO electrode at various scan rates also was measured. The results indicated that both potential difference between redox peaks and peak current of K3[Fe(CN)6] increased with increasing scan rate. A good linearity of peak current versus scan rate was observed.