Black phosphorus quantum dots enabled photo-assisted supercapacitor with boosted volumetric charge storage capability  

作　　者：Yu Liu Xiumei Chen Baodong Mao Yulong Ying Longhua Li Weidong Shi 

机构地区：[1]School of Chemistry and Chemical Engineering Jiangsu University,Zhenjiang 212013,China [2]School of Materials Science and Engineering,Zhejiang Sci-Tech University,Hangzhou 310018,China

出　　处：《Journal of Materials Science & Technology》2024年第24期80-88,共9页材料科学技术(英文版)

基　　金：supported by the National Natural Science Foundation of China(No.22225808);the Industry Prospect and Key Core Technology(Competition Project)of Jiangsu Province(No.BE2019093);the Sino-German Cooperation Group Project(No.GZ1579).

摘　　要：Photo-assisted rechargeable energy storage devices are a promising strategy to achieve sustainable development by simultaneously integrating solar energy conversion and supercapacitor storage.Herein,we fabricated a light-sensitive macroporous film based on carbon nanotube(CNT),intercalated with Co_(2)V_(2)O_(7),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 capability 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 im proving 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@Co_(2)V_(2)O_(7)/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.

关 键 词：SUPERCAPACITOR Photo-assisted charging Energy density Macroporous film Photoinduced charge carriers 

分 类 号：O64[理学—物理化学]