İki boyutlu malzeme üzerine hibrit süperkapakitör: Mxenler, grafen ve metal kalkojenitler

Stroke by the dreadful global warming, the world is changing in the field of energy generation in a direction auspicious for more environment friendly green energy sources. The interruptible nature of these energy systems hinders their ability to meet the over everyday energy demand. A remedy to this is found in the development of energy storage systems such as batteries and supercapacitors (SCs). Albeit endowment with high power density, SCs most often suffer from low energy storage capabilities. The design of electrode materials with desired efficient charge storage capabilities is one of the multiple pathways taken to boast device performance, and the discovery of 2D materials with peculiar electrochemical properties has nonetheless motivated their research as electrode materials. Although seemingly overrated performance at one or few layers, 2D materials tend to suffer from agglomeration, markedly reducing their capacitance. This study is directed at the growth of 2D materials (Graphene, Transition metal dichalcogenides; TMDCs and MXenes) and their SC application. SCs constructed with ~0.63 nm thick graphene measured a specific capacitance of 44 μF cm-2 and an gravimetric capacitance of 308 F g-1 at a rate of 1 mV s-1 in 1M Na2SO4 electrolyte, which increased to 154 μF cm-2 at 8 times the initial thickness, suggesting little restacking. The highest gravimetric capacitance was measured for the 1.26 nm thick graphene to be 441 F g-1 at 1 mV s-1 with an energy density of 39.2 Wh kg-1 at a power density of 12.4 kW g-1. Non-terminated MXenes are superconductive and possess large interlayer spacing for ion intercalation. Mo2C, as grown by CVD, demonstrated rather interesting results, recording a capacitance of ~671 μF cm-2 at a scan rate of 1 mV s-1. Keywords: Supercapacitor, Specific Capacitance, CVD and MXenes