Bromide Ion Additive for High-Performance Photo-Assisted Rechargeable Zinc Ion Hybrid Supercapacitor

Abstract

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 ZnSO<inf>4</inf> and 0.05M ZnBr<inf>2</inf> electrolytes were found to be effective for CuO, while 1.9M ZnSO<inf>4</inf> and 0.1M ZnBr<inf>2</inf> electrolytes were found to be effective for MnO<inf>2</inf>. The maximum solar gain in MnO<inf>2</inf>-based electrodes was %129 for 0.05M ZnBr<inf>2</inf> added electrolyte tested via cyclic voltammetry at a scan rate of 0.05Vs-1. Furthermore, the electrode stability test was conducted for both MnO<inf>2</inf> and CuO-based electrodes. Over the course of one week, each electrode was subjected to 10,000 GCD cycles. © 2025 Elsevier B.V., All rights reserved.