Abstract
To enhance the utilization of abundant yet intermittent sunlight, the integration of solar energy conversion and storage has received increasing attention, and utilizing photoelectrodes to drive non-spontaneous reversible redox reactions provides a promising solution. This study proposes a triple-compartment system combining dual-photoelectrode (TiO2 and pTTh) with vanadium-copper electrolytes for integrated solar energy conversion and storage. The system can convert solar energy into chemical energy under simulated solar illumination (100 mW∙cm−2, AM 1.5G) and controllably release the stored chemical energy in the form of electrical energy. The system achieves a discharge open-circuit voltage of 0.47 V and a short-circuit current density of 1.3 mA∙cm−2. In constant current discharge tests, a discharge capacity of 2 mAh is observed at 0.3 mA∙cm−2.
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