Abstract
Energy storage is pivotal for the continuous utilization of solar energy suffering from the intermittency issue. Herein, we demonstrate a solar rechargeable flow cell (SRFC) based on photoelectrochemical regeneration of vanadium redox species for in-situ solar energy harvest and storage. In this device, TiO2 and MWCNT/acetylene black (MWCNT/AB) composite are served as the photoanode and the counter electrode, respectively, with all vanadium redox couples, VO2+/VO2+ and VO2+/V3+, as solar energy storage media. Benefitting from solar energy, the cell can be photocharged under a bias as low as 0.1V, which is much lower than the discharge voltage of ∼0.5V. Photocharged under the optimized condition, the cell delivers a discharge energy of 23.0mWh/L with 67.4% input electric energy savings. This prototype work may inspire the rational design for cost-effective solar energy storage devices.
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