2.2. Electrochemical behavior study
During the electrochemical study, a standard three electrode
configuration was employed with the conductive hybrid diamond/
graphite film as working electrode, platinum wire as counter
electrode, Ag/AgCl (3 M KCl) and Ag/Ag+ (0.01 M) as reference electrodes.
The active area of the working electrode is 0.053 cm2.
Electrochemical behaviors of the electrodes were carried out in
1 mM [Fe(CN)6]3−/4− in 0.1 M KCl and 1 mM ferrocene in 0.1 M tetrabutylammonium
tetrafluoroborate (TBABF4) in CH3CN solution.
0.1 M Sulfuric acid was used for the measurement of electrochemical
potential window. AgNO3 (99.9999%) and Cu(NO3)2 (99.999%)
powders were purchased from Sigma–Aldrich. All analyte solutions
of standard concentration were freshly prepared using Milli-Q (Millipore
Direct-Q 8 system) water with a resistivity of 18.2 M cm
and all the electrochemical measurements were carried out on a
potentiostat (Autolab 302N).