Photonic Synthesis of High-performance Manganese Oxide Thin Film Electrode with ultra-long Lifetime for Supercapacitor Applications

By using a photonic curing system (PulseForge 1300, NovaCentrix), we have instantaneously synthesized manganese oxide thin films. Characterizations are done by using Scanning Electron Microscopy, X-ray Diffraction, and Raman Spectroscopy. Electrochemical characterization, i.e., cyclic voltammetry, charge-discharge cycling, and electrochemical impedance spectroscopy (EIS) were carried out in three-electrode cell configuration (where Hg-HgO, Pt-wire, and our sample are reference, counter and working electrodes respectively) with 1 M KOH as the electrolyte. The presence of redox peaks in cyclic voltammetry curves confirms the pseudocapacitive behavior of the sample while identical CV curves even at higher scan rates further suggest excellent rate capability and ideal supercapacitor behavior. The galvanostatic charge-discharge measurements (GCD) performed at 0.2 mA current resulted in initial specific capacitance as high as 11 mF/cm² for 2-pulses irradiated electrode. After performing GCD measurements for 100000 cycles, we found that the electrode retains as high as 89%, which shows that as prepared electrode possesses excellent stability and long lifetime.