Abstract
This study presents an innovative approach to integrated energy systems by combining solar energy harvesting and electrochemical charge storage in a single modular platform. By strategically incorporating a MoS2/NaTaO3 heterostructure material, we have developed a photo-rechargeable zinc-ion capacitor (PR-ZIC) that utilises the synergistic benefits of this unique configuration. The photoactive MoS2/NaTaO3 cathode effectively absorbs light and charges the capacitor, enabling continuous light-driven operation. Experimental studies show that the MoS2/NaTaO3-based photo-rechargeable zinc-ion capacitor (PR-ZIC) exhibits a significant increase in capacitance when irradiated with light, with a 2.76-fold increase (93.94 mF cm-2) compared to dark conditions (33.95 mF cm-2) at a 10 mV s-1 scan rate. In addition, these capacitors show a photocharge voltage response of about 860 mV and excellent cyclability, retaining about 96% of their capacity over 4000 charge-discharge cycles. The results of this study highlight the potential of the MoS2/NaTaO3 heterostructure as a high-performance photoactive material for advanced photo-rechargeable zinc-ion energy storage devices. This integrated approach offers innovative off-grid energy solutions by optimizing device footprint, minimizing energy transfer losses and providing sustainable energy storage options.
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