The increasing demand for energy storage technologies has highlighted the need to discover and develop advanced materials for sustainable energy generation and storage. In this study, we deposited mono- and bi-layer metal-organic frameworks (MOFs) on doped titanium dioxide nanotubes with tungsten trioxide (WTNT) to fabricate an electrode for photosupercapacitors. The modified titanium dioxide nanotubes were prepared using anodizing method. A electrochemical deposition method used to deposit mono- and bi-layer MOFs on WTNT. The results of electrochemical tests, both in the dark and in the presence of light, indicated the better performance of the bilayer Ni-Co-BTC/WTNT electrode in charge storage capability. This electrode recorded the highest capacity compared to other electrodes, so that at a current density of 0.04 mA.cm-2, its capacity in the dark was 1.14 mAh.cm-2 and after exposure to light, this value increased to 3.33 mAh.cm-2. In order to investigate the practical performance of the electrode in a real system, a two-electrode system was assembled. The results of this system showed that the performance in the symmetric configuration is much better than the asymmetric configuration. In the asymmetric system, the capacitance in the dark was 0.18 mAh.cm-2, which increased by about 4 times to 0.75 mAh.cm-2 after exposure to light. In comparison, the symmetric system showed a capacity of 1 mAh.cm-2 under light conditions, which was significantly superior to the asymmetric system under the same conditions. The stability of the electrode also eva‎luated. After 8000 charge and discharge cycles, the electrode in the asymmetric system retained 98.7% of its initial capacity in the dark and 89.3% in the presence of light. Also in the symmetric system, very high stability observed, so that after 8000 cycles, it retained 91.1% of its capacity. These results confirm the stability and high efficiency of the fabricated electrode. Overall, this study provides a promising strategy for the development of high-performance photoelectrode materials for use in energy storage devices.

محمدمحسن مومني هامانه

محمد كيخسروي

حسن حداد زاده , اسماعيل حيدري