Abstract
Photo-assisted rechargeable energy storage devices are a promising strategy to achieve sustainable de-velopment by simultaneously integrating solar energy conversion and supercapacitor storage.Herein,we fabricated a light-sensitive macroporous film based on carbon nanotube(CNT),intercalated with Co2V2O7,and then modified by black phosphorus quantum dots(BPQD).Physico-chemical characterization and density functional theory are employed to investigate the improved photo-assisted charge storage capa-bility and the underlying mechanism.It is demonstrated that photo-generated carriers can be separated efficiently,and the formed abundant interfaces could modulate the electronic structure of the electrode,effectively improving the conductivity.Under visible light,the electrode displays an ultra-high capacity of 138.4 mA h g-1(197.9 mA h cm-3)at 1 A g-1.Besides,the CNT@Co2V2O7/BPQD supercapacitor shows a maximum energy density of 44.4 Wh kg-1(60.0 Wh L-1)at a power density of 800 W kg-1(960 W L-1)and excellent cyclic stability of 104.8％after 13,000 charge/discharge cycles.The above improvements are attributed to the reactivity and kinetics of electrochemically active components.This study reveals the synergistic effects of multi-interface on"light,photo-generated charge,and energy storage"and provides new possibilities in the controllable design of novel photo-assisted energy storage devices.
基金项目
National Natural Science Foundation of China(22225808)
Industry Prospect and Key Core Technology(Competition Project)of Jiangsu Province(BE2019093)
Sino-German Cooperation Group Project(GZ1579)
NETL
NSTL
万方数据