Atomic/nano-scale in-situ probing the shuttling effect of redox mediator in Na-O_(2) batteries  

作　　者：Kai Yang Yiwei Li Langlang Jia Yan Wang Zijian Wang YuChen jia Shichun Yang Magda Titirici Xinhua Liu Luyi Yang Feng Pan 

机构地区：[1]School of Advanced Materials,Peking University Shenzhen Graduate School,Shenzhen 518055,Guangdong,China [2]School of Transportation Science and Engineering,Beihang University,Beijing 100191,China [3]Department of Chemical Engineering,Imperial College London,London SW72AZ,UK

出　　处：《Journal of Energy Chemistry》2021年第5期438-443,共6页能源化学（英文版）

基　　金：financially supported by Soft Science Research Project of Guangdong Province(No.2017B030301013);the Shenzhen Science and Technology Research(Grant No.JCYJ20170818085823773,ZDSYS201707281026184);China Postdoctoral Science Foundation(2019M660317);the National Science Foundation of China(No.U1864213)。

摘　　要：Sodium-oxygen batteries(Na-O_(2))have attracted extensive attention as promising energy storage systems due to their high energy density and low cost.Redox mediators are often employed to improve Na-O_(2) battery performance,however,their effect on the formation mechanism of the oxygen reduction product(NaO_(2))is still unclear.Here,we have investigated the formation mechanism of NaO_(2) during the discharge process in the presence of a redox mediator with the help of atomic/nano-scale in-situ characterization tools used in concert(e.g.atomic force microscope,electrochemical quartz crystal microbalance(EQCM)and laser nano-particle analyzer).As a result,real-time observations on different time scales show that by shuttling electrons to the electrolyte,the redox mediator enables formation of NaO_(2) in the solution-phase instead of within a finite region near the electrode surface.These findings provide new fundamental insights on the understanding of Na-O_(2) batteries and new consequently perspectives on designing high performance metal-O_(2) batteries and other related functions.

关 键 词：Na-O_(2)battery In-situ AFM EQCM Redox mediator Shuttling effect 

分 类 号：O643.36[理学—物理化学] TM911.41[理学—化学]