Abstract
In the present era, as the human population is increasing, prices for non-renewable resources are also increasing day by day. Shortage of non-renewable resources and their high prices urge the researchers to pay huge attention to enhance the annual energy production by the renewable energy resources. Energy storage devices (ESDs) play a crucial role in meeting the energy requirements of human populations. Rechargeable batteries are one of the most used energy storage device technologies. But, due to their short lifetime and lower power density, restricted them to install in those applications, where the bursts of energy are required. On the other hand, Supercapacitors are the potential devices from we can obtain excellent power density for our required appropriate applications. To fabricate supercapacitors, there are numerous categories of materials but due to extraordinary crystallinity and porous nature, transition metal-based metal organic frameworks (MOFs) have grabbed huge attention from the researchers. Due to their porous nature, MOFs offered high ion diffusion and high mass specific capacity for ESDs. In this work, Zr-MOF, and Mn-MOF were successfully synthesized via one step Hydrothermal route by changing their molarity ration with salt and BTC organic linker. Different molarity ratio presented different mass specific capacities values. Best results were obtained by 3:2 molar ratios of salt and linker respectively. XRD depicted the high level of crystallinity in the Mn-MOF and 13.088 nm average particle size. Transparent rod like morphology which further clarified by using SEM. Furthermore, the electrochemical performance of the fabricated electrode was analyzed by using CV, GCD, and EIS. The electrode declared excellent mass specific capacity and high stability. Highest specific capacitance 1575 F/g was measured by CV and 1131.3 F/g by GCD at 1mV/s and 1A/g respectively. EIS confirmed the excellent performance of an electrode by giving very low equivalent series resistance of 1.76 Ω and negligible charge-transfer resistance. By considering all the results mentioned, transition-metal based MOFs can be considered as an excellent choice of materials to fabricate next generation energy storage devices.