Behavior similar to that shown in Fig. 3 was also observed for
potentiostatic electrodeposition (−1.00V), which is presented in
Fig. 4. In this case,M/z values remained near 33.00 gmol
−1 through-
out electrodeposition in a pH5.40 solution. For the pH2.70 solution,
M/z values began at approximately 12.00 gmol
−1 and continued
increasing up to a value of 26.00 gmol
−1 at the end of the process.
ThisM/z can be explained using simultaneousmechanisms, includ-
ing the direct reduction reaction and the cobalt reduction reaction,
with adsorbed hydrogen formation. Comparison of M/z values
during potentiostatic electrodeposition at two different potentials
(pH 2.70) revealed that M/z was larger when the deposition was
performed at a more negative potential. Thus, the potential dis-