Furthermore, our study may lead to exciting findings as theoretical studies predict that porous 2D metal oxide are an excellent candidate for a variety of future applications such as energy storage, catalysis, and wearable electronics. Here, we showcase that a material like Cr2O3 with barley any catalytic activity for OER in bulk form, can activated as a high performing catalyst with low OER overpotential and high mass activity. Moreover, these 2D metal oxides may carry a range of exciting new scientific phenomena such as two dimensional ferromagnetic configurations. In the future, precise control of synthesis parameters such as interlayer space of the rGO may allow to tailor properties of the resulting 2D TMO such as crystal orientation and metal/oxide vacancies.