摘要
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, TiO_2 and MWCNT/acetylene black（MWCNT/AB） composite are served as the photoanode and the counter electrode,respectively, with all vanadium redox couples, VO_2~＋/VO^（2＋）and VO^（2＋）/V^（3＋）, as solar energy storage media.Benefitting from solar energy, the cell can be photocharged under a bias as low as 0.1 V, which is much lower than the discharge voltage of ~0.5 V. Photocharged under the optimized condition, the cell delivers a discharge energy of 23.0 mWh/L with 67.4% input electric energy savings. This prototype work may inspire the rational design for cost-effective solar energy storage devices.
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, TiO_2 and MWCNT/acetylene black（MWCNT/AB） composite are served as the photoanode and the counter electrode,respectively, with all vanadium redox couples, VO_2~＋/VO^（2＋）and VO^（2＋）/V^（3＋）, as solar energy storage media.Benefitting from solar energy, the cell can be photocharged under a bias as low as 0.1 V, which is much lower than the discharge voltage of ~0.5 V. Photocharged under the optimized condition, the cell delivers a discharge energy of 23.0 mWh/L with 67.4% input electric energy savings. This prototype work may inspire the rational design for cost-effective solar energy storage devices.
基金
financially supported by the National Natural Science Foundation of China(grant no.21573230)
973 National Basic Research Program of the Ministry of Science and Technology(grant no.2014CB239400)
