The observations of Cr content and reduction state of GO during the electrochemical process can explain the peaks in the CV scan. At -1.1 V (peak A), the GO is reduced and an underlying nucleation loop is observed. At -1.8 V (peak B), high levels of Cr 3+ and oxygen (Figure and Figure ) indicate the presence of Cr2O3 within the rGO films. As shown in the later analysis, the high oxygen content can be attributed to the synthesized 2D Cr2O3 nanosheets. This is in line with the fact that the Cr/O ratio is close to stoichiometric ratio of Cr2O3 (Inset of Figure ). Additionally, exposure to -2.3 V leads to pronounced formation of gas bubbles, resulting in breakage of the GO film. Thus -1.8 V is the optimum voltage for the synthesis of Cr2O3 within the rGO stack.