The growth of Bi2O2CO3 nanosheets through nanosecond-pulsed discharges in liquid environments has been achieved by applying voltages slightly above the breakdown voltage. This growth process involves surface modification of the cathode electrode following pretreatment with chemical etching. Remarkably, the choice of liquid medium, whether water or liquid nitrogen, does not significantly affect the interaction between the electrodes and the metallic discharge that forms during the initial stages of synthesis. This process is template-free. The anisotropic growth of these two-dimensional objects is attributed to ion-assisted deposition via the ledge mechanism, supplemented by the presence of surface defects. Prior to the growth treatments, chemical etching is essential to enhance the probability of nanosheet formation from virtually zero to almost a hundred percent. This step is crucial in eliminating native oxide layers and exposing surface defects, which are present as parallel planes forming combs within polishing scratches. The detachment of nanosheets from the cathode and their release into the liquid is facilitated by the sweeping of the liquid-bubble interface, which breaks the nanosheets away from their substrate. As the electrodes undergo aging, nanosheets are formed by outward diffusion of bismuth and reaction with water and CO2 in the air. By gaining a better understanding of this growth mechanism, exciting opportunities arise for the design and large-scale production of 2D nanostructures.