Bromide ion additive for high-performance photo-assisted rechargeable zinc ion hybrid supercapacitor

Increasing the capacitance of photo-assisted rechargeable zinc ion hybrid supercapacitor can be accomplished through the utilization of bromide ions in conjunction with a supportive electrolyte, as demonstrated by this work. In this study, it is also proved that the combination of bromide and sulfate salts of zinc has a positive impact on the photosensitivity of metal oxide supercapacitors. It has been demonstrated that cyclic voltammetry and galvanic charge-discharge tests both exhibit an increase in capacitance when the conditions are either dark or illuminated. Both 1.95M ZnSO4 and 0.05M ZnBr2 electrolytes were found to be effective for CuO, while 1.9M ZnSO4 and 0.1M ZnBr2 electrolytes were found to be effective for MnO2. The maximum solar gain in MnO2-based electrodes was %129 for 0.05M ZnBr2 added electrolyte tested via cyclic voltammetry at a scan rate of 0.05Vs-1. Furthermore, the electrode stability test was conducted for both MnO2 and CuO-based electrodes. Over the course of one week, each electrode was subjected to 10,000 GCD cycles.