Thermal effects for the doped graphene quantum dots: Cyclic voltammetry

With an objective to develop electrode materials with high specific capacitance and good stability, we prepared Graphene quantum dot-doped with transition metal of HCl by using a facile hydrothermal at different temperatures (~ 800C- 1400C). Samples were characterized by Raman spectroscopy, Powdered X-ray Diffraction (PXRD), U-V Visible Spectroscopy, and Transmission Electron Spectroscopy (TEM). Raman spectroscopy study reveals intensity ratio alters with changes in temperatures. It was found the variation in size with doped GQDs under different temperature conditions from TEM measurements. The observed blue shifts in the energy gap of HCl doped GQDs at higher temperature are attributed to the strong interaction of GQDs with HCl. Electrochemical studies showed a superior strategy for generating transition metals doped GQDs. The higher electrochemical activity has been originated by using cyclic voltammetry of HCl doped GQDs at 1200C and is found to be superior electrodes than all other heated samples. The simplicity of synthesized material suggests electrode to understand the charge storage mechanism for commercial applications.