Photoinduced Cu^(+)/Cu^(2+)interconversion for enhancing energy conversion and storage performances of CuO based Li-ion battery  

作　　者：Qiuman Zhang Meng Wei Qianwen Dong Qiongzhi Gao Xin Cai Shengsen Zhang Teng Yuan Feng Peng Yueping Fang Siyuan Yang 

机构地区：[1]Key Laboratory for Biobased Materials and Energy of Ministry of Education,Guangdong Laboratory for Lingnan Modern Agriculture,College of Materials and Energy,South China Agricultural University,Guangzhou 510642,Guangdong,China [2]School of Chemistry and Chemical Engineering,Guangzhou University,Guangzhou 51006,Guangdong,China

出　　处：《Journal of Energy Chemistry》2023年第4期83-91,共9页能源化学（英文版）

基　　金：supported by the Laboratory of Lingnan Modern Agriculture Project(NZ2021029);the National Natural Science Foundation of China(Nos.21802046 and 21972048)。

摘　　要：Pursuing appropriate photo-active Li-ion storage materials and understanding their basic energy storage/conversion principle are pretty crucial for the rapidly developing photoassisted Li-ion batteries(PA-LIBs).Copper oxide(CuO)is one of the most popular candidates in both LIBs and photocatalysis.While CuO based PA-LIBs have never been reported yet.Herein,one-dimensional(1D)CuO nanowire arrays in situ grown on a three-dimensional(3D)copper foam support were employed as dualfunctional photoanode for both‘solar-to-electricity’and‘electricity-to-chemical’energy conversion in the PA-LIBs.It is found that light energy can be indeed stored and converted into electrical energy through the assembled CuO based PA-LIBs.Without external power source,the photo conversion efficiency of CuO based photocell reaches about 0.34%.Impressively,at a high current density of 4000 m A g^(-1),photoassisted discharge and charge specific capacity of CuO based PA-LIBs respectively receive 64.01%and 60.35%enhancement compared with the net electric charging and discharging process.Mechanism investigation reveals that photogenerated charges from CuO promote the interconversion between Cu^(2+)and Cu^(+)during the discharging/charging process,thus forcing the lithium storage reaction more completely and increasing the specific capacity of the PA-LIBs.This work can provide a general principle for the development of other high-efficient semiconductor-based PA-LIBs.

关 键 词：Li-ion batteries Energy conversion and storage Photo rechargeable Electrochemistry Copper oxide 

分 类 号：TM912[电气工程—电力电子与电力传动] O643.36[理学—物理化学]