Metal oxide and 2D material electrodes for next generation supercapacitor: ZNO and mxene

Official URL: https://risc01.sabanciuniv.edu/record=b2862146_(Table of contents)

Supercapacitors are gaining tremendous attention as energy storage devices for the benefits these devices can offer, like fast charge-discharge, high shelf life, and improved cyclic stability compared to other energy storage devices. Here in, we report the development of high-performance supercapacitor devices by using manganese-doped Zinc oxide nanowires (Mn-ZnO NWs), copper-doped zinc oxide nanoparticles (Cu-ZnO NPs), and cobalt doped Zinc Oxide nanoparticles (Co-ZnONPs)) as one electrode and MXene as the second electrode material. The synthesis of all the electrode materials is presented along with the structural, electronic, optical, and electrochemical analyses. Transitional metal doped ZnO (TM-ZnO) possess competing effect of intrinsic and extrinsic defect signals, which were analyzed by Electron paramagnetic resonance spectroscopy (EPR) and photoluminescence spectroscopy (PL), the presence of these defects increases the overall synergy between the components of supercapacitor device which leads to enhanced performance of our supercapacitor. TM-ZnO samples when used in combination with MXene as a second electrode, increased the performance of supercapacitors even further as MXene offered high conductivity and high surface area. The electrochemical result of the assembled supercapacitor when measured by techniques like cyclic voltammetry, impedance spectroscopy, and galvanostatic charge-discharge showed some encouraging results. The highest performance value for a supercapacitor was obtained to be 151 F/g specific capacitance with 84 Wh/kg energy density and a power density of 75 kW/kg.