In situ NMR metrology reveals reaction mechanisms in redox flow batteries

doi:10.1038/s41586-020-2081-7

GSTDTAP > 地球科学

DOI	10.1038/s41586-020-2081-7
	In situ NMR metrology reveals reaction mechanisms in redox flow batteries
	Ma, Jianfei 1; You, Xin 1; Sun, Shan 1; Wang, Xiaoxiao 2; Qin, Song 2; Sui, Sen-Fang 1
	2020-02-01
发表期刊	NATURE
ISSN	0028-0836
EISSN	1476-4687
出版年	2020
卷号	579 期号:7798 页码:224-+
文章类型	Article
语种	英语
国家	England; Sweden; Spain; Peoples R China; South Korea
英文关键词	Large-scale energy storage is becoming increasingly critical to balancing renewable energy production and consumption(1). Organic redox flow batteries, made from inexpensive and sustainable redox-active materials, are promising storage technologies that are cheaper and less environmentally hazardous than vanadium-based batteries, but they have shorter lifetimes and lower energy density(2,3). Thus, fundamental insight at the molecular level is required to improve performance(4,5). Here we report two in situ nuclear magnetic resonance (NMR) methods of studying redox flow batteries, which are applied to two redox-active electrolytes: 2,6-dihydroxyanthraquinone (DHAQ) and 4,4 ' -((9,10-anthraquinone-2,6-diyl)dioxy) dibutyrate (DBEAQ). In the first method, we monitor the changes in the H-1 NMR shift of the liquid electrolyte as it flows out of the electrochemical cell. In the second method, we observe the changes that occur simultaneously in the positive and negative electrodes in the full electrochemical cell. Using the bulk magnetization changes (observed via the H-1 NMR shift of the water resonance) and the line broadening of the H-1 shifts of the quinone resonances as a function of the state of charge, we measure the potential differences of the two single-electron couples, identify and quantify the rate of electron transfer between the reduced and oxidized species, and determine the extent of electron delocalization of the unpaired spins over the radical anions. These NMR techniques enable electrolyte decomposition and battery self-discharge to be explored in real time, and show that DHAQ is decomposed electrochemically via a reaction that can be minimized by limiting the voltage used on charging. We foresee applications of these NMR methods in understanding a wide range of redox processes in flow and other electrochemical systems.
领域	地球科学 ; 气候变化 ; 资源环境
收录类别	SCI-E
WOS记录号	WOS:000517743700002
WOS关键词	ELECTRON-TRANSFER ; SPIN-DENSITIES ; SPECTROSCOPY ; EXCHANGE ; IONS ; REDUCTION ; KINETICS
WOS类目	Multidisciplinary Sciences
WOS研究方向	Science & Technology - Other Topics
引用统计
文献类型	期刊论文
条目标识符	http://119.78.100.173/C666/handle/2XK7JSWQ/281341
专题	地球科学资源环境科学气候变化
作者单位	1.Tsinghua Univ, Sch Life Sci, Beijing Adv Innovat Ctr Struct Biol, State Key Lab Membrane Biol, Beijing, Peoples R China; 2.Chinese Acad Sci, Yantai Inst Coast Zone Res, Yantai, Peoples R China
推荐引用方式 GB/T 7714	Ma, Jianfei,You, Xin,Sun, Shan,et al. In situ NMR metrology reveals reaction mechanisms in redox flow batteries[J]. NATURE,2020,579(7798):224-+.
APA	Ma, Jianfei,You, Xin,Sun, Shan,Wang, Xiaoxiao,Qin, Song,&Sui, Sen-Fang.(2020).In situ NMR metrology reveals reaction mechanisms in redox flow batteries.NATURE,579(7798),224-+.
MLA	Ma, Jianfei,et al."In situ NMR metrology reveals reaction mechanisms in redox flow batteries".NATURE 579.7798(2020):224-+.