High Performance of In-situ Annealed Partial Pressurized Pulsed Laser Ablated (PLD) WO3 & V2O5 Thin Film electrodes for Flexible all Solid State Supercapbatteries
Flexible all solid-state hybrid supercapacitors (HSCs) are considered as significant energy storage devices and used as major power sources in various real-time applications. Herein, we fabricated high crystalline WO3 || V2O5 thin film supercapbatteries where WO3 and V2O5 showed Pseudo-capacitive and battery type behavior, respectively. Very first time, WO3 || V2O5 thin film based combination have investigated in this work. Thin film structured electrodes used in this study are prepared at partially pressured, in-situ annealing conditions using Pulsed Laser Deposition (PLD) technique. The as prepared 1.5 V solid state hybrid device delivered a maximum volumetric capacitance of 40.28 F. cm-3 at 0.1 mA. cm-2. A maximum specific energy density of ~12.6 mWh. cm-3 at a specific power density of 0.31 W. cm-3 was also received. Further, the device showed excellent round trip efficiency of 99.4% even after 50000 cycles with the capacitance retention of 95.2%. The performance characteristics of the hybrid device are also compared with the V2O5||V2O5 and WO3||WO3 symmetric devices which showed superior performance than the symmetric devices. In addition, the function of the device at various engineering aspect such as flexible, twisted, and folded conditions was demonstrated successfully. Furthermore, demonstration of Light-Emitting Diodes (LEDs) using HSCs confirming the potential applications of such devices in wearable and portable devices.