Photoelectrochemical regeneration of all vanadium redox species for construction of a solar rechargeable flow cell

• 来源期刊: 能源化学
• 年，卷（期）: 2018,（1）
• 页码范围: 278-282
• 页数: 5页
• 语种: 英文

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,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 0.1 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.