Abstract:
Voltammetry, chronoamperometry, scanning electrochemical microscopy and electrochemical
impedance spectroscopy methods are used for characterization of a glassy carbon electrode modified
with multi-walled carbon nanotubes (MWCNTs)–cobalt tetraaminophthalocyanine (CoTAPc) mixture or
sequential drop dry modification technique whereby the MWCNTs are first placed on to the electrode
followed by CoTAPc. The sequential drop dry CoTAPc–MWCNTs modified surface gave better catalytic
responses with a catalytic rate constant of 2.2 × 105M−1 s−1, apparent electron transfer rate constant
of 0.073 cm s−1, and a limit of detection of 2.8 × 10−7 M. Scanning electrochemical microscopy (SECM)
surface characterization (topography and reactivity) further gave proof the better catalytic perfomance
of the sequential drop dry CoTAPc–MWCNTs modified surface.
