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 Kai Yang;Yiwei Li;Langlang Jia;Yan Wang;Zijian Wang;YuChen Ji;Shichun Yang;Magda Titirici;Xinhua Liu;Luyi Yang;Feng Pan

作者机构：School of Advanced MaterialsPeking University Shenzhen Graduate SchoolShenzhen 518055GuangdongChina School of Transportation Science and EngineeringBeihang UniversityBeijing 100191China Department of Chemical EngineeringImperial College LondonLondon SW72AZUK 

出 版 物：《Journal of Energy Chemistry》 (能源化学（英文版）)

年 卷 期：2021年第30卷第5期

页      面：438-443页

核心收录：

学科分类：0820[工学-石油与天然气工程] 0808[工学-电气工程] 081705[工学-工业催化] 08[工学] 0817[工学-化学工程与技术] 0807[工学-动力工程及工程热物理] 0827[工学-核科学与技术] 0703[理学-化学] 

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)。 

主　　题：Na-O_(2)battery In-situ AFM EQCM Redox mediator Shuttling effect 

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.***.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.