Preparation of aqueous zinc ion rGH/BiVO4 photorechargeable integrated supercapacitor

The development of industrialization has increased the prominence of the gradual consumption of non-renewable resources and the environmental problems due to fossil fuels , gradually increasing the use of solar energy. Therefore, converting solar energy into electric energy through energy collection and storage systems and its applications have become a research hotspot in recent years. This study constructed a novel all-in-one photorechargeable supercapacitor using bismuth vanadate (BiVO 4 ), reduced graphene oxide hydrogel (rGH), and Zn (CF 3 SO 3 ) 2 as photoanode , cathode, and electrolyte, respectively. Consequently, the device exhibits a 309.3 F/g high capacitance at 0.1 A g −1 under illumination with 95 mW cm −2 light intensity , 26.3 % higher than normal electric charging, and the supercapacitor has a 100 % capacity retention rate after 10,000 testing cycles under photoelectric synergistic charging and discharging. The as-constructed supercapacitor integrated with solar energy collection and electrochemical energy storage has potential applications in wearable electronic products and other fields.