To explore the synthesis procedure, cyclic voltammetry (CV) profiling was used to probe for possible reactions at different voltages. Figure shows three cycles of CV-curves. In the forward scan of the first cycle, two peaks are clearly observed around -1.1 (region A) and -1.8 V vs. Ag/AgCl (region B). Meanwhile, there is no noticeable peak in the reverse scan, which indicates that underlying electrochemical process is irreversible. Furthermore, the CV scan reveals an underlaying nucleation loop at peak A (-1.1 V) as the voltage in reverse scan is higher than in forward scan. In the second and third cycle, peak A is not observable and peak B is decreased in intensity. This implies that most electrochemical reactions are completed in the first cycle.