In this study, the fabrication of a flexible photo-supercapacitor was investigated. This device was developed using nickel ferrite synthesized via the co-precipitation method as the active material and a flexible indium tin oxide/polyethylene terephthalate (ITO/PET) substrate, employing a simple and cost-effective drop-casting technique. The capacitive performance and photoelectrochemical properties of the fabricated samples were eva‎luated through electrochemical tests. The results revealed that the presence of nickel ferrite on the ITO substrate played a significant role in enhancing electrochemical performance. The optimized photoelectrode exhibited the highest specific capacity among the samples; specifically, under a current density of 0.03 mA.cm-2, it achieved a specific capacity of 1.180 mAh·cm⁻² in the absence of light. Under light illumination, the capacity significantly increased, reaching 1.605 mAh·cm⁻². To further eva‎luate the performance, symmetric and asymmetric supercapacitor systems based on graphite were designed and fabricated, and their electrochemical and photoelectrochemical behaviors were tested. The results showed that the asymmetric system demonstrated superior capacitive performance compared to the symmetric configuration. The asymmetric photo-supercapacitor, under a current density of 0.03 mA.cm-2, delivered a specific capacity of 1.638 mAh·cm⁻² in darkness and 0.47 mAh·cm⁻² under illumination, indicating a notable improvement over the symmetric counterpart. Also, cyclic stability studies showed that after 9000 consecutive charge/discharge cycles, this system not only maintained its initial capacity but also added 15 and 6 percent to its initial capacity in the dark and light, respectively. Based on these findings, it can be concluded that the designed flexible photoelectrode is a promising candidate for the development of next-generation flexible photo-supercapacitors.

محمدمحسن مومني هامانه , فاطمه داور

محمد ديناري , اسماعيل حيدري