Design Of Solar Rechargeable Energy Storage Devices And Investigation Of The Electrochemical Performance

Due to the depletion of fossil fuels and the growing problem of environmental pollution,the development and utilization of new energy sources is imminent.Solar energy is a clean,safe and sustainable energy source with abundant reserves,low cost and no pollution,and has great potential for application in the future energy field.However,the intermittent solar energy seriously hinders its practical application.At present,solar cells convert solar energy into electrical energy to storage or utilization.Simultaneous conversion and storage of solar energy is the key to efficient use of solar energy.Designing photovoltaic systems and energy storage unit integrated devices enables simultaneous solar energy conversion and storage.Not only is the device structure simple,but it also reduces energy loss during solar energy storage.This paper designs solar rechargeable supercapacitors,solar rechargeable lithium batteries and solar rechargeable liquid flow batteries,and solar energy-assisted energy storage devices to achieve integration of conversion and storage,and improve solar energy utilization efficiency.The main research contents are as follows:1.Design solar rechargeable supercapacitor devices,microwave synthesis mesoporous Fe2O3/GO composites.The Prussian blue/graphene oxide composite was synthesized by microwave heating from the inside to the outside,and the Fe2O3/GO composite was obtained as a supercapacitor anode material by calcination.Fe2O3 acts both as a storage electrode and as a semiconductor material,generating electron-hole pairs under photoexcitation.During the discharge process,the photoexcitation increases the discharge specific capacity of the Fe2O3/GO electrode by 10%,enabling simultaneous conversion and storage of solar energy.2.Design solar rechargeable lithium battery devices,light-irradiated titanium oxide nanotube array(TNT),TNT generates electron-hole pairs,holes oxidize iodine negative ions(I-)into iodine triple anions(I3-),electrons was transferred to the anode to reduce lithium ions(Li+).The semiconductor generates a photovoltage to the charging voltage,and the charging voltage is lower than the discharging voltage,saving part of the electric energy,and realizing the conversion and storage of the solar energy.3.Design a dual-drive solar rechargeable flow battery device.A single photoelectrode produces a photovoltage of more than 1.0 V,which is a semiconductor with a wide band gap.It can only absorb the short-wavelength solar spectrum and reduce the utilization efficiency of solar energy.The dual-light system compensates for this disadvantage.C3N4 acts as photoanode and Gd Cr O3 as photocathode,photoexcited C3N4 generates electron-hole pairs,holes oxidize DMPZ,the other side excites Gd Cr O3 to generate electron-hole pairs,electrons reduce PL,and electrons generated by C3N4 is combined with the holes generated by Gd Cr O3 to form a complete charging circuit to realize the conversion and storage of the solar energy.