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Atomic/nano-scale in-situ probing the shuttling effect of redox mediator in Na–O2 batteries
Journal of Energy Chemistry ( IF 13.1 ) Pub Date : 2020-08-27 , DOI: 10.1016/j.jechem.2020.08.025
Kai Yang , Yiwei Li , Langlang Jia , Yan Wang , Zijian Wang , YuChen Ji , Shichun Yang , Magda Titirici , Xinhua Liu , Luyi Yang , Feng Pan

Sodium-oxygen batteries (Na-O2) 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-O2 battery performance, however, their effect on the formation mechanism of the oxygen reduction product (NaO2) is still unclear. Here, we have investigated the formation mechanism of NaO2 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 NaO2 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-O2 batteries and new consequently perspectives on designing high performance metal-O2 batteries and other related functions.



中文翻译:

原子/纳米级原位探测氧化还原介体在Na–O 2电池中的穿梭效应

钠氧电池(Na-O 2)由于其高能量密度和低成本而作为有前途的储能系统受到了广泛的关注。氧化还原介体通常用于改善Na-O 2电池性能,但是,它们对氧还原产物(NaO 2)形成机理的影响仍不清楚。在这里,我们借助原子/纳米尺度原位研究了氧化还原介体存在下放电过程中NaO 2的形成机理。音乐会中使用的表征工具(例如原子力显微镜,电化学石英晶体微天平(EQCM)和激光纳米颗粒分析仪)。结果,在不同时间尺度上的实时观察表明,通过将电子穿梭到电解质中,氧化还原介体能够在溶液相而不是在电极表面附近的有限区域内形成NaO 2。这些发现为理解Na-O 2电池提供了新的基础见解,并因此为设计高性能金属O 2电池和其他相关功能提供了新的视角。

更新日期:2020-09-08
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